The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngwutil.c - utilities to write a PNG file |
| 3 | * |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 4 | * Last changed in libpng 1.6.19 [November 12, 2015] |
| 5 | * Copyright (c) 1998-2015 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 8 | * |
| 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 12 | */ |
| 13 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 14 | #include "pngpriv.h" |
| 15 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 16 | #ifdef PNG_WRITE_SUPPORTED |
| 17 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 18 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 19 | /* Place a 32-bit number into a buffer in PNG byte order. We work |
| 20 | * with unsigned numbers for convenience, although one supported |
| 21 | * ancillary chunk uses signed (two's complement) numbers. |
| 22 | */ |
| 23 | void PNGAPI |
| 24 | png_save_uint_32(png_bytep buf, png_uint_32 i) |
| 25 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 26 | buf[0] = (png_byte)(i >> 24); |
| 27 | buf[1] = (png_byte)(i >> 16); |
| 28 | buf[2] = (png_byte)(i >> 8); |
| 29 | buf[3] = (png_byte)(i ); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 30 | } |
| 31 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 32 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 33 | * The parameter is declared unsigned int, not png_uint_16, |
| 34 | * just to avoid potential problems on pre-ANSI C compilers. |
| 35 | */ |
| 36 | void PNGAPI |
| 37 | png_save_uint_16(png_bytep buf, unsigned int i) |
| 38 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 39 | buf[0] = (png_byte)(i >> 8); |
| 40 | buf[1] = (png_byte)(i ); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 41 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 42 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 43 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 44 | /* Simple function to write the signature. If we have already written |
| 45 | * the magic bytes of the signature, or more likely, the PNG stream is |
| 46 | * being embedded into another stream and doesn't need its own signature, |
| 47 | * we should call png_set_sig_bytes() to tell libpng how many of the |
| 48 | * bytes have already been written. |
| 49 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 50 | void PNGAPI |
| 51 | png_write_sig(png_structrp png_ptr) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 52 | { |
| 53 | png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| 54 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 55 | #ifdef PNG_IO_STATE_SUPPORTED |
| 56 | /* Inform the I/O callback that the signature is being written */ |
| 57 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE; |
| 58 | #endif |
| 59 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 60 | /* Write the rest of the 8 byte signature */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 61 | png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes], |
| 62 | (png_size_t)(8 - png_ptr->sig_bytes)); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 63 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 64 | if (png_ptr->sig_bytes < 3) |
| 65 | png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE; |
| 66 | } |
| 67 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 68 | /* Write the start of a PNG chunk. The type is the chunk type. |
| 69 | * The total_length is the sum of the lengths of all the data you will be |
| 70 | * passing in png_write_chunk_data(). |
| 71 | */ |
| 72 | static void |
| 73 | png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name, |
| 74 | png_uint_32 length) |
| 75 | { |
| 76 | png_byte buf[8]; |
| 77 | |
| 78 | #if defined(PNG_DEBUG) && (PNG_DEBUG > 0) |
| 79 | PNG_CSTRING_FROM_CHUNK(buf, chunk_name); |
| 80 | png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length); |
| 81 | #endif |
| 82 | |
| 83 | if (png_ptr == NULL) |
| 84 | return; |
| 85 | |
| 86 | #ifdef PNG_IO_STATE_SUPPORTED |
| 87 | /* Inform the I/O callback that the chunk header is being written. |
| 88 | * PNG_IO_CHUNK_HDR requires a single I/O call. |
| 89 | */ |
| 90 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR; |
| 91 | #endif |
| 92 | |
| 93 | /* Write the length and the chunk name */ |
| 94 | png_save_uint_32(buf, length); |
| 95 | png_save_uint_32(buf + 4, chunk_name); |
| 96 | png_write_data(png_ptr, buf, 8); |
| 97 | |
| 98 | /* Put the chunk name into png_ptr->chunk_name */ |
| 99 | png_ptr->chunk_name = chunk_name; |
| 100 | |
| 101 | /* Reset the crc and run it over the chunk name */ |
| 102 | png_reset_crc(png_ptr); |
| 103 | |
| 104 | png_calculate_crc(png_ptr, buf + 4, 4); |
| 105 | |
| 106 | #ifdef PNG_IO_STATE_SUPPORTED |
| 107 | /* Inform the I/O callback that chunk data will (possibly) be written. |
| 108 | * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls. |
| 109 | */ |
| 110 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA; |
| 111 | #endif |
| 112 | } |
| 113 | |
| 114 | void PNGAPI |
| 115 | png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, |
| 116 | png_uint_32 length) |
| 117 | { |
| 118 | png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length); |
| 119 | } |
| 120 | |
| 121 | /* Write the data of a PNG chunk started with png_write_chunk_header(). |
| 122 | * Note that multiple calls to this function are allowed, and that the |
| 123 | * sum of the lengths from these calls *must* add up to the total_length |
| 124 | * given to png_write_chunk_header(). |
| 125 | */ |
| 126 | void PNGAPI |
| 127 | png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, |
| 128 | png_size_t length) |
| 129 | { |
| 130 | /* Write the data, and run the CRC over it */ |
| 131 | if (png_ptr == NULL) |
| 132 | return; |
| 133 | |
| 134 | if (data != NULL && length > 0) |
| 135 | { |
| 136 | png_write_data(png_ptr, data, length); |
| 137 | |
| 138 | /* Update the CRC after writing the data, |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 139 | * in case the user I/O routine alters it. |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 140 | */ |
| 141 | png_calculate_crc(png_ptr, data, length); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /* Finish a chunk started with png_write_chunk_header(). */ |
| 146 | void PNGAPI |
| 147 | png_write_chunk_end(png_structrp png_ptr) |
| 148 | { |
| 149 | png_byte buf[4]; |
| 150 | |
| 151 | if (png_ptr == NULL) return; |
| 152 | |
| 153 | #ifdef PNG_IO_STATE_SUPPORTED |
| 154 | /* Inform the I/O callback that the chunk CRC is being written. |
| 155 | * PNG_IO_CHUNK_CRC requires a single I/O function call. |
| 156 | */ |
| 157 | png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC; |
| 158 | #endif |
| 159 | |
| 160 | /* Write the crc in a single operation */ |
| 161 | png_save_uint_32(buf, png_ptr->crc); |
| 162 | |
| 163 | png_write_data(png_ptr, buf, (png_size_t)4); |
| 164 | } |
| 165 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 166 | /* Write a PNG chunk all at once. The type is an array of ASCII characters |
| 167 | * representing the chunk name. The array must be at least 4 bytes in |
| 168 | * length, and does not need to be null terminated. To be safe, pass the |
| 169 | * pre-defined chunk names here, and if you need a new one, define it |
| 170 | * where the others are defined. The length is the length of the data. |
| 171 | * All the data must be present. If that is not possible, use the |
| 172 | * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() |
| 173 | * functions instead. |
| 174 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 175 | static void |
| 176 | png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name, |
| 177 | png_const_bytep data, png_size_t length) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 178 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 179 | if (png_ptr == NULL) |
| 180 | return; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 181 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 182 | /* On 64-bit architectures 'length' may not fit in a png_uint_32. */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 183 | if (length > PNG_UINT_31_MAX) |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 184 | png_error(png_ptr, "length exceeds PNG maximum"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 185 | |
| 186 | png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length); |
| 187 | png_write_chunk_data(png_ptr, data, length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 188 | png_write_chunk_end(png_ptr); |
| 189 | } |
| 190 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 191 | /* This is the API that calls the internal function above. */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 192 | void PNGAPI |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 193 | png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, |
| 194 | png_const_bytep data, png_size_t length) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 195 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 196 | png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data, |
| 197 | length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 198 | } |
| 199 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 200 | /* This is used below to find the size of an image to pass to png_deflate_claim, |
| 201 | * so it only needs to be accurate if the size is less than 16384 bytes (the |
| 202 | * point at which a lower LZ window size can be used.) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 203 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 204 | static png_alloc_size_t |
| 205 | png_image_size(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 206 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 207 | /* Only return sizes up to the maximum of a png_uint_32; do this by limiting |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 208 | * the width and height used to 15 bits. |
| 209 | */ |
| 210 | png_uint_32 h = png_ptr->height; |
| 211 | |
| 212 | if (png_ptr->rowbytes < 32768 && h < 32768) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 213 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 214 | if (png_ptr->interlaced != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 215 | { |
| 216 | /* Interlacing makes the image larger because of the replication of |
| 217 | * both the filter byte and the padding to a byte boundary. |
| 218 | */ |
| 219 | png_uint_32 w = png_ptr->width; |
| 220 | unsigned int pd = png_ptr->pixel_depth; |
| 221 | png_alloc_size_t cb_base; |
| 222 | int pass; |
| 223 | |
| 224 | for (cb_base=0, pass=0; pass<=6; ++pass) |
| 225 | { |
| 226 | png_uint_32 pw = PNG_PASS_COLS(w, pass); |
| 227 | |
| 228 | if (pw > 0) |
| 229 | cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass); |
| 230 | } |
| 231 | |
| 232 | return cb_base; |
| 233 | } |
| 234 | |
| 235 | else |
| 236 | return (png_ptr->rowbytes+1) * h; |
| 237 | } |
| 238 | |
| 239 | else |
| 240 | return 0xffffffffU; |
| 241 | } |
| 242 | |
| 243 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 244 | /* This is the code to hack the first two bytes of the deflate stream (the |
| 245 | * deflate header) to correct the windowBits value to match the actual data |
| 246 | * size. Note that the second argument is the *uncompressed* size but the |
| 247 | * first argument is the *compressed* data (and it must be deflate |
| 248 | * compressed.) |
| 249 | */ |
| 250 | static void |
| 251 | optimize_cmf(png_bytep data, png_alloc_size_t data_size) |
| 252 | { |
| 253 | /* Optimize the CMF field in the zlib stream. The resultant zlib stream is |
| 254 | * still compliant to the stream specification. |
| 255 | */ |
| 256 | if (data_size <= 16384) /* else windowBits must be 15 */ |
| 257 | { |
| 258 | unsigned int z_cmf = data[0]; /* zlib compression method and flags */ |
| 259 | |
| 260 | if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) |
| 261 | { |
| 262 | unsigned int z_cinfo; |
| 263 | unsigned int half_z_window_size; |
| 264 | |
| 265 | z_cinfo = z_cmf >> 4; |
| 266 | half_z_window_size = 1U << (z_cinfo + 7); |
| 267 | |
| 268 | if (data_size <= half_z_window_size) /* else no change */ |
| 269 | { |
| 270 | unsigned int tmp; |
| 271 | |
| 272 | do |
| 273 | { |
| 274 | half_z_window_size >>= 1; |
| 275 | --z_cinfo; |
| 276 | } |
| 277 | while (z_cinfo > 0 && data_size <= half_z_window_size); |
| 278 | |
| 279 | z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); |
| 280 | |
| 281 | data[0] = (png_byte)z_cmf; |
| 282 | tmp = data[1] & 0xe0; |
| 283 | tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; |
| 284 | data[1] = (png_byte)tmp; |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 289 | #endif /* WRITE_OPTIMIZE_CMF */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 290 | |
| 291 | /* Initialize the compressor for the appropriate type of compression. */ |
| 292 | static int |
| 293 | png_deflate_claim(png_structrp png_ptr, png_uint_32 owner, |
| 294 | png_alloc_size_t data_size) |
| 295 | { |
| 296 | if (png_ptr->zowner != 0) |
| 297 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 298 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 299 | char msg[64]; |
| 300 | |
| 301 | PNG_STRING_FROM_CHUNK(msg, owner); |
| 302 | msg[4] = ':'; |
| 303 | msg[5] = ' '; |
| 304 | PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner); |
| 305 | /* So the message that results is "<chunk> using zstream"; this is an |
| 306 | * internal error, but is very useful for debugging. i18n requirements |
| 307 | * are minimal. |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 308 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 309 | (void)png_safecat(msg, (sizeof msg), 10, " using zstream"); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 310 | #endif |
| 311 | #if PNG_RELEASE_BUILD |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 312 | png_warning(png_ptr, msg); |
| 313 | |
| 314 | /* Attempt sane error recovery */ |
| 315 | if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */ |
| 316 | { |
| 317 | png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT"); |
| 318 | return Z_STREAM_ERROR; |
| 319 | } |
| 320 | |
| 321 | png_ptr->zowner = 0; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 322 | #else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 323 | png_error(png_ptr, msg); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 324 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | { |
| 328 | int level = png_ptr->zlib_level; |
| 329 | int method = png_ptr->zlib_method; |
| 330 | int windowBits = png_ptr->zlib_window_bits; |
| 331 | int memLevel = png_ptr->zlib_mem_level; |
| 332 | int strategy; /* set below */ |
| 333 | int ret; /* zlib return code */ |
| 334 | |
| 335 | if (owner == png_IDAT) |
| 336 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 337 | if ((png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 338 | strategy = png_ptr->zlib_strategy; |
| 339 | |
| 340 | else if (png_ptr->do_filter != PNG_FILTER_NONE) |
| 341 | strategy = PNG_Z_DEFAULT_STRATEGY; |
| 342 | |
| 343 | else |
| 344 | strategy = PNG_Z_DEFAULT_NOFILTER_STRATEGY; |
| 345 | } |
| 346 | |
| 347 | else |
| 348 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 349 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 350 | level = png_ptr->zlib_text_level; |
| 351 | method = png_ptr->zlib_text_method; |
| 352 | windowBits = png_ptr->zlib_text_window_bits; |
| 353 | memLevel = png_ptr->zlib_text_mem_level; |
| 354 | strategy = png_ptr->zlib_text_strategy; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 355 | #else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 356 | /* If customization is not supported the values all come from the |
| 357 | * IDAT values except for the strategy, which is fixed to the |
| 358 | * default. (This is the pre-1.6.0 behavior too, although it was |
| 359 | * implemented in a very different way.) |
| 360 | */ |
| 361 | strategy = Z_DEFAULT_STRATEGY; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 362 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | /* Adjust 'windowBits' down if larger than 'data_size'; to stop this |
| 366 | * happening just pass 32768 as the data_size parameter. Notice that zlib |
| 367 | * requires an extra 262 bytes in the window in addition to the data to be |
| 368 | * able to see the whole of the data, so if data_size+262 takes us to the |
| 369 | * next windowBits size we need to fix up the value later. (Because even |
| 370 | * though deflate needs the extra window, inflate does not!) |
| 371 | */ |
| 372 | if (data_size <= 16384) |
| 373 | { |
| 374 | /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to |
| 375 | * work round a Microsoft Visual C misbehavior which, contrary to C-90, |
| 376 | * widens the result of the following shift to 64-bits if (and, |
| 377 | * apparently, only if) it is used in a test. |
| 378 | */ |
| 379 | unsigned int half_window_size = 1U << (windowBits-1); |
| 380 | |
| 381 | while (data_size + 262 <= half_window_size) |
| 382 | { |
| 383 | half_window_size >>= 1; |
| 384 | --windowBits; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* Check against the previous initialized values, if any. */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 389 | if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0 && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 390 | (png_ptr->zlib_set_level != level || |
| 391 | png_ptr->zlib_set_method != method || |
| 392 | png_ptr->zlib_set_window_bits != windowBits || |
| 393 | png_ptr->zlib_set_mem_level != memLevel || |
| 394 | png_ptr->zlib_set_strategy != strategy)) |
| 395 | { |
| 396 | if (deflateEnd(&png_ptr->zstream) != Z_OK) |
| 397 | png_warning(png_ptr, "deflateEnd failed (ignored)"); |
| 398 | |
| 399 | png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED; |
| 400 | } |
| 401 | |
| 402 | /* For safety clear out the input and output pointers (currently zlib |
| 403 | * doesn't use them on Init, but it might in the future). |
| 404 | */ |
| 405 | png_ptr->zstream.next_in = NULL; |
| 406 | png_ptr->zstream.avail_in = 0; |
| 407 | png_ptr->zstream.next_out = NULL; |
| 408 | png_ptr->zstream.avail_out = 0; |
| 409 | |
| 410 | /* Now initialize if required, setting the new parameters, otherwise just |
| 411 | * to a simple reset to the previous parameters. |
| 412 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 413 | if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 414 | ret = deflateReset(&png_ptr->zstream); |
| 415 | |
| 416 | else |
| 417 | { |
| 418 | ret = deflateInit2(&png_ptr->zstream, level, method, windowBits, |
| 419 | memLevel, strategy); |
| 420 | |
| 421 | if (ret == Z_OK) |
| 422 | png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; |
| 423 | } |
| 424 | |
| 425 | /* The return code is from either deflateReset or deflateInit2; they have |
| 426 | * pretty much the same set of error codes. |
| 427 | */ |
| 428 | if (ret == Z_OK) |
| 429 | png_ptr->zowner = owner; |
| 430 | |
| 431 | else |
| 432 | png_zstream_error(png_ptr, ret); |
| 433 | |
| 434 | return ret; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 435 | } |
| 436 | } |
| 437 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 438 | /* Clean up (or trim) a linked list of compression buffers. */ |
| 439 | void /* PRIVATE */ |
| 440 | png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 441 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 442 | png_compression_bufferp list = *listp; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 443 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 444 | if (list != NULL) |
| 445 | { |
| 446 | *listp = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 447 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 448 | do |
| 449 | { |
| 450 | png_compression_bufferp next = list->next; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 451 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 452 | png_free(png_ptr, list); |
| 453 | list = next; |
| 454 | } |
| 455 | while (list != NULL); |
| 456 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 457 | } |
| 458 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 459 | #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 460 | /* This pair of functions encapsulates the operation of (a) compressing a |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 461 | * text string, and (b) issuing it later as a series of chunk data writes. |
| 462 | * The compression_state structure is shared context for these functions |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 463 | * set up by the caller to allow access to the relevant local variables. |
| 464 | * |
| 465 | * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size |
| 466 | * temporary buffers. From 1.6.0 it is retained in png_struct so that it will |
| 467 | * be correctly freed in the event of a write error (previous implementations |
| 468 | * just leaked memory.) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 469 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 470 | typedef struct |
| 471 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 472 | png_const_bytep input; /* The uncompressed input data */ |
| 473 | png_alloc_size_t input_len; /* Its length */ |
| 474 | png_uint_32 output_len; /* Final compressed length */ |
| 475 | png_byte output[1024]; /* First block of output */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 476 | } compression_state; |
| 477 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 478 | static void |
| 479 | png_text_compress_init(compression_state *comp, png_const_bytep input, |
| 480 | png_alloc_size_t input_len) |
| 481 | { |
| 482 | comp->input = input; |
| 483 | comp->input_len = input_len; |
| 484 | comp->output_len = 0; |
| 485 | } |
| 486 | |
| 487 | /* Compress the data in the compression state input */ |
| 488 | static int |
| 489 | png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name, |
| 490 | compression_state *comp, png_uint_32 prefix_len) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 491 | { |
| 492 | int ret; |
| 493 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 494 | /* To find the length of the output it is necessary to first compress the |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 495 | * input. The result is buffered rather than using the two-pass algorithm |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 496 | * that is used on the inflate side; deflate is assumed to be slower and a |
| 497 | * PNG writer is assumed to have more memory available than a PNG reader. |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 498 | * |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 499 | * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an |
| 500 | * upper limit on the output size, but it is always bigger than the input |
| 501 | * size so it is likely to be more efficient to use this linked-list |
| 502 | * approach. |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 503 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 504 | ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 505 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 506 | if (ret != Z_OK) |
| 507 | return ret; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 508 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 509 | /* Set up the compression buffers, we need a loop here to avoid overflowing a |
| 510 | * uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited |
| 511 | * by the output buffer size, so there is no need to check that. Since this |
| 512 | * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits |
| 513 | * in size. |
| 514 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 515 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 516 | png_compression_bufferp *end = &png_ptr->zbuffer_list; |
| 517 | png_alloc_size_t input_len = comp->input_len; /* may be zero! */ |
| 518 | png_uint_32 output_len; |
| 519 | |
| 520 | /* zlib updates these for us: */ |
| 521 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input); |
| 522 | png_ptr->zstream.avail_in = 0; /* Set below */ |
| 523 | png_ptr->zstream.next_out = comp->output; |
| 524 | png_ptr->zstream.avail_out = (sizeof comp->output); |
| 525 | |
| 526 | output_len = png_ptr->zstream.avail_out; |
| 527 | |
| 528 | do |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 529 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 530 | uInt avail_in = ZLIB_IO_MAX; |
| 531 | |
| 532 | if (avail_in > input_len) |
| 533 | avail_in = (uInt)input_len; |
| 534 | |
| 535 | input_len -= avail_in; |
| 536 | |
| 537 | png_ptr->zstream.avail_in = avail_in; |
| 538 | |
| 539 | if (png_ptr->zstream.avail_out == 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 540 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 541 | png_compression_buffer *next; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 542 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 543 | /* Chunk data is limited to 2^31 bytes in length, so the prefix |
| 544 | * length must be counted here. |
| 545 | */ |
| 546 | if (output_len + prefix_len > PNG_UINT_31_MAX) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 547 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 548 | ret = Z_MEM_ERROR; |
| 549 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 550 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 551 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 552 | /* Need a new (malloc'ed) buffer, but there may be one present |
| 553 | * already. |
| 554 | */ |
| 555 | next = *end; |
| 556 | if (next == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 557 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 558 | next = png_voidcast(png_compression_bufferp, png_malloc_base |
| 559 | (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 560 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 561 | if (next == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 562 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 563 | ret = Z_MEM_ERROR; |
| 564 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 565 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 566 | |
| 567 | /* Link in this buffer (so that it will be freed later) */ |
| 568 | next->next = NULL; |
| 569 | *end = next; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 570 | } |
| 571 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 572 | png_ptr->zstream.next_out = next->output; |
| 573 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
| 574 | output_len += png_ptr->zstream.avail_out; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 575 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 576 | /* Move 'end' to the next buffer pointer. */ |
| 577 | end = &next->next; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 578 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 579 | |
| 580 | /* Compress the data */ |
| 581 | ret = deflate(&png_ptr->zstream, |
| 582 | input_len > 0 ? Z_NO_FLUSH : Z_FINISH); |
| 583 | |
| 584 | /* Claw back input data that was not consumed (because avail_in is |
| 585 | * reset above every time round the loop). |
| 586 | */ |
| 587 | input_len += png_ptr->zstream.avail_in; |
| 588 | png_ptr->zstream.avail_in = 0; /* safety */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 589 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 590 | while (ret == Z_OK); |
| 591 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 592 | /* There may be some space left in the last output buffer. This needs to |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 593 | * be subtracted from output_len. |
| 594 | */ |
| 595 | output_len -= png_ptr->zstream.avail_out; |
| 596 | png_ptr->zstream.avail_out = 0; /* safety */ |
| 597 | comp->output_len = output_len; |
| 598 | |
| 599 | /* Now double check the output length, put in a custom message if it is |
| 600 | * too long. Otherwise ensure the z_stream::msg pointer is set to |
| 601 | * something. |
| 602 | */ |
| 603 | if (output_len + prefix_len >= PNG_UINT_31_MAX) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 604 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 605 | png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long"); |
| 606 | ret = Z_MEM_ERROR; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 607 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 608 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 609 | else |
| 610 | png_zstream_error(png_ptr, ret); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 611 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 612 | /* Reset zlib for another zTXt/iTXt or image data */ |
| 613 | png_ptr->zowner = 0; |
| 614 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 615 | /* The only success case is Z_STREAM_END, input_len must be 0; if not this |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 616 | * is an internal error. |
| 617 | */ |
| 618 | if (ret == Z_STREAM_END && input_len == 0) |
| 619 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 620 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 621 | /* Fix up the deflate header, if required */ |
| 622 | optimize_cmf(comp->output, comp->input_len); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 623 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 624 | /* But Z_OK is returned, not Z_STREAM_END; this allows the claim |
| 625 | * function above to return Z_STREAM_END on an error (though it never |
| 626 | * does in the current versions of zlib.) |
| 627 | */ |
| 628 | return Z_OK; |
| 629 | } |
| 630 | |
| 631 | else |
| 632 | return ret; |
| 633 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 634 | } |
| 635 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 636 | /* Ship the compressed text out via chunk writes */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 637 | static void |
| 638 | png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 639 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 640 | png_uint_32 output_len = comp->output_len; |
| 641 | png_const_bytep output = comp->output; |
| 642 | png_uint_32 avail = (sizeof comp->output); |
| 643 | png_compression_buffer *next = png_ptr->zbuffer_list; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 644 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 645 | for (;;) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 646 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 647 | if (avail > output_len) |
| 648 | avail = output_len; |
| 649 | |
| 650 | png_write_chunk_data(png_ptr, output, avail); |
| 651 | |
| 652 | output_len -= avail; |
| 653 | |
| 654 | if (output_len == 0 || next == NULL) |
| 655 | break; |
| 656 | |
| 657 | avail = png_ptr->zbuffer_size; |
| 658 | output = next->output; |
| 659 | next = next->next; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 660 | } |
| 661 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 662 | /* This is an internal error; 'next' must have been NULL! */ |
| 663 | if (output_len > 0) |
| 664 | png_error(png_ptr, "error writing ancillary chunked compressed data"); |
| 665 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 666 | #endif /* WRITE_COMPRESSED_TEXT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 667 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 668 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 669 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| 670 | /* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, |
| 671 | * and if invalid, correct the keyword rather than discarding the entire |
| 672 | * chunk. The PNG 1.0 specification requires keywords 1-79 characters in |
| 673 | * length, forbids leading or trailing whitespace, multiple internal spaces, |
| 674 | * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. |
| 675 | * |
| 676 | * The 'new_key' buffer must be 80 characters in size (for the keyword plus a |
| 677 | * trailing '\0'). If this routine returns 0 then there was no keyword, or a |
| 678 | * valid one could not be generated, and the caller must png_error. |
| 679 | */ |
| 680 | static png_uint_32 |
| 681 | png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) |
| 682 | { |
| 683 | png_const_charp orig_key = key; |
| 684 | png_uint_32 key_len = 0; |
| 685 | int bad_character = 0; |
| 686 | int space = 1; |
| 687 | |
| 688 | png_debug(1, "in png_check_keyword"); |
| 689 | |
| 690 | if (key == NULL) |
| 691 | { |
| 692 | *new_key = 0; |
| 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | while (*key && key_len < 79) |
| 697 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 698 | png_byte ch = (png_byte)*key++; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 699 | |
| 700 | if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) |
| 701 | *new_key++ = ch, ++key_len, space = 0; |
| 702 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 703 | else if (space == 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 704 | { |
| 705 | /* A space or an invalid character when one wasn't seen immediately |
| 706 | * before; output just a space. |
| 707 | */ |
| 708 | *new_key++ = 32, ++key_len, space = 1; |
| 709 | |
| 710 | /* If the character was not a space then it is invalid. */ |
| 711 | if (ch != 32) |
| 712 | bad_character = ch; |
| 713 | } |
| 714 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 715 | else if (bad_character == 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 716 | bad_character = ch; /* just skip it, record the first error */ |
| 717 | } |
| 718 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 719 | if (key_len > 0 && space != 0) /* trailing space */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 720 | { |
| 721 | --key_len, --new_key; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 722 | if (bad_character == 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 723 | bad_character = 32; |
| 724 | } |
| 725 | |
| 726 | /* Terminate the keyword */ |
| 727 | *new_key = 0; |
| 728 | |
| 729 | if (key_len == 0) |
| 730 | return 0; |
| 731 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 732 | #ifdef PNG_WARNINGS_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 733 | /* Try to only output one warning per keyword: */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 734 | if (*key != 0) /* keyword too long */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 735 | png_warning(png_ptr, "keyword truncated"); |
| 736 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 737 | else if (bad_character != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 738 | { |
| 739 | PNG_WARNING_PARAMETERS(p) |
| 740 | |
| 741 | png_warning_parameter(p, 1, orig_key); |
| 742 | png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); |
| 743 | |
| 744 | png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); |
| 745 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 746 | #endif /* WARNINGS */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 747 | |
| 748 | return key_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 749 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 750 | #endif /* WRITE_TEXT || WRITE_pCAL || WRITE_iCCP || WRITE_sPLT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 751 | |
| 752 | /* Write the IHDR chunk, and update the png_struct with the necessary |
| 753 | * information. Note that the rest of this code depends upon this |
| 754 | * information being correct. |
| 755 | */ |
| 756 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 757 | png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, |
| 758 | int bit_depth, int color_type, int compression_type, int filter_type, |
| 759 | int interlace_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 760 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 761 | png_byte buf[13]; /* Buffer to store the IHDR info */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 762 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 763 | png_debug(1, "in png_write_IHDR"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 764 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 765 | /* Check that we have valid input data from the application info */ |
| 766 | switch (color_type) |
| 767 | { |
| 768 | case PNG_COLOR_TYPE_GRAY: |
| 769 | switch (bit_depth) |
| 770 | { |
| 771 | case 1: |
| 772 | case 2: |
| 773 | case 4: |
| 774 | case 8: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 775 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
| 776 | case 16: |
| 777 | #endif |
| 778 | png_ptr->channels = 1; break; |
| 779 | |
| 780 | default: |
| 781 | png_error(png_ptr, |
| 782 | "Invalid bit depth for grayscale image"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 783 | } |
| 784 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 785 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 786 | case PNG_COLOR_TYPE_RGB: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 787 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 788 | if (bit_depth != 8 && bit_depth != 16) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 789 | #else |
| 790 | if (bit_depth != 8) |
| 791 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 792 | png_error(png_ptr, "Invalid bit depth for RGB image"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 793 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 794 | png_ptr->channels = 3; |
| 795 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 796 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 797 | case PNG_COLOR_TYPE_PALETTE: |
| 798 | switch (bit_depth) |
| 799 | { |
| 800 | case 1: |
| 801 | case 2: |
| 802 | case 4: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 803 | case 8: |
| 804 | png_ptr->channels = 1; |
| 805 | break; |
| 806 | |
| 807 | default: |
| 808 | png_error(png_ptr, "Invalid bit depth for paletted image"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 809 | } |
| 810 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 811 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 812 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
| 813 | if (bit_depth != 8 && bit_depth != 16) |
| 814 | png_error(png_ptr, "Invalid bit depth for grayscale+alpha image"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 815 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 816 | png_ptr->channels = 2; |
| 817 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 818 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 819 | case PNG_COLOR_TYPE_RGB_ALPHA: |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 820 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 821 | if (bit_depth != 8 && bit_depth != 16) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 822 | #else |
| 823 | if (bit_depth != 8) |
| 824 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 825 | png_error(png_ptr, "Invalid bit depth for RGBA image"); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 826 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 827 | png_ptr->channels = 4; |
| 828 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 829 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 830 | default: |
| 831 | png_error(png_ptr, "Invalid image color type specified"); |
| 832 | } |
| 833 | |
| 834 | if (compression_type != PNG_COMPRESSION_TYPE_BASE) |
| 835 | { |
| 836 | png_warning(png_ptr, "Invalid compression type specified"); |
| 837 | compression_type = PNG_COMPRESSION_TYPE_BASE; |
| 838 | } |
| 839 | |
| 840 | /* Write filter_method 64 (intrapixel differencing) only if |
| 841 | * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and |
| 842 | * 2. Libpng did not write a PNG signature (this filter_method is only |
| 843 | * used in PNG datastreams that are embedded in MNG datastreams) and |
| 844 | * 3. The application called png_permit_mng_features with a mask that |
| 845 | * included PNG_FLAG_MNG_FILTER_64 and |
| 846 | * 4. The filter_method is 64 and |
| 847 | * 5. The color_type is RGB or RGBA |
| 848 | */ |
| 849 | if ( |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 850 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 851 | !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) != 0 && |
| 852 | ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 853 | (color_type == PNG_COLOR_TYPE_RGB || |
| 854 | color_type == PNG_COLOR_TYPE_RGB_ALPHA) && |
| 855 | (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) && |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 856 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 857 | filter_type != PNG_FILTER_TYPE_BASE) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 858 | { |
| 859 | png_warning(png_ptr, "Invalid filter type specified"); |
| 860 | filter_type = PNG_FILTER_TYPE_BASE; |
| 861 | } |
| 862 | |
| 863 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| 864 | if (interlace_type != PNG_INTERLACE_NONE && |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 865 | interlace_type != PNG_INTERLACE_ADAM7) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 866 | { |
| 867 | png_warning(png_ptr, "Invalid interlace type specified"); |
| 868 | interlace_type = PNG_INTERLACE_ADAM7; |
| 869 | } |
| 870 | #else |
| 871 | interlace_type=PNG_INTERLACE_NONE; |
| 872 | #endif |
| 873 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 874 | /* Save the relevant information */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 875 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 876 | png_ptr->color_type = (png_byte)color_type; |
| 877 | png_ptr->interlaced = (png_byte)interlace_type; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 878 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 879 | png_ptr->filter_type = (png_byte)filter_type; |
| 880 | #endif |
| 881 | png_ptr->compression_type = (png_byte)compression_type; |
| 882 | png_ptr->width = width; |
| 883 | png_ptr->height = height; |
| 884 | |
| 885 | png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels); |
| 886 | png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 887 | /* Set the usr info, so any transformations can modify it */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 888 | png_ptr->usr_width = png_ptr->width; |
| 889 | png_ptr->usr_bit_depth = png_ptr->bit_depth; |
| 890 | png_ptr->usr_channels = png_ptr->channels; |
| 891 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 892 | /* Pack the header information into the buffer */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 893 | png_save_uint_32(buf, width); |
| 894 | png_save_uint_32(buf + 4, height); |
| 895 | buf[8] = (png_byte)bit_depth; |
| 896 | buf[9] = (png_byte)color_type; |
| 897 | buf[10] = (png_byte)compression_type; |
| 898 | buf[11] = (png_byte)filter_type; |
| 899 | buf[12] = (png_byte)interlace_type; |
| 900 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 901 | /* Write the chunk */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 902 | png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 903 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 904 | if ((png_ptr->do_filter) == PNG_NO_FILTERS) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 905 | { |
| 906 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 907 | png_ptr->bit_depth < 8) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 908 | png_ptr->do_filter = PNG_FILTER_NONE; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 909 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 910 | else |
| 911 | png_ptr->do_filter = PNG_ALL_FILTERS; |
| 912 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 913 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 914 | png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 915 | } |
| 916 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 917 | /* Write the palette. We are careful not to trust png_color to be in the |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 918 | * correct order for PNG, so people can redefine it to any convenient |
| 919 | * structure. |
| 920 | */ |
| 921 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 922 | png_write_PLTE(png_structrp png_ptr, png_const_colorp palette, |
| 923 | png_uint_32 num_pal) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 924 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 925 | png_uint_32 max_palette_length, i; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 926 | png_const_colorp pal_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 927 | png_byte buf[3]; |
| 928 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 929 | png_debug(1, "in png_write_PLTE"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 930 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 931 | max_palette_length = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ? |
| 932 | (1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH; |
| 933 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 934 | if (( |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 935 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 936 | (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 && |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 937 | #endif |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 938 | num_pal == 0) || num_pal > max_palette_length) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 939 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 940 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 941 | { |
| 942 | png_error(png_ptr, "Invalid number of colors in palette"); |
| 943 | } |
| 944 | |
| 945 | else |
| 946 | { |
| 947 | png_warning(png_ptr, "Invalid number of colors in palette"); |
| 948 | return; |
| 949 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 950 | } |
| 951 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 952 | if ((png_ptr->color_type & PNG_COLOR_MASK_COLOR) == 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 953 | { |
| 954 | png_warning(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 955 | "Ignoring request to write a PLTE chunk in grayscale PNG"); |
| 956 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 957 | return; |
| 958 | } |
| 959 | |
| 960 | png_ptr->num_palette = (png_uint_16)num_pal; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 961 | png_debug1(3, "num_palette = %d", png_ptr->num_palette); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 962 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 963 | png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3)); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 964 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 965 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 966 | for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++) |
| 967 | { |
| 968 | buf[0] = pal_ptr->red; |
| 969 | buf[1] = pal_ptr->green; |
| 970 | buf[2] = pal_ptr->blue; |
| 971 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
| 972 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 973 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 974 | #else |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 975 | /* This is a little slower but some buggy compilers need to do this |
| 976 | * instead |
| 977 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 978 | pal_ptr=palette; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 979 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 980 | for (i = 0; i < num_pal; i++) |
| 981 | { |
| 982 | buf[0] = pal_ptr[i].red; |
| 983 | buf[1] = pal_ptr[i].green; |
| 984 | buf[2] = pal_ptr[i].blue; |
| 985 | png_write_chunk_data(png_ptr, buf, (png_size_t)3); |
| 986 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 987 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 988 | #endif |
| 989 | png_write_chunk_end(png_ptr); |
| 990 | png_ptr->mode |= PNG_HAVE_PLTE; |
| 991 | } |
| 992 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 993 | /* This is similar to png_text_compress, above, except that it does not require |
| 994 | * all of the data at once and, instead of buffering the compressed result, |
| 995 | * writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out |
| 996 | * because it calls the write interface. As a result it does its own error |
| 997 | * reporting and does not return an error code. In the event of error it will |
| 998 | * just call png_error. The input data length may exceed 32-bits. The 'flush' |
| 999 | * parameter is exactly the same as that to deflate, with the following |
| 1000 | * meanings: |
| 1001 | * |
| 1002 | * Z_NO_FLUSH: normal incremental output of compressed data |
| 1003 | * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush |
| 1004 | * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up |
| 1005 | * |
| 1006 | * The routine manages the acquire and release of the png_ptr->zstream by |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1007 | * checking and (at the end) clearing png_ptr->zowner; it does some sanity |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1008 | * checks on the 'mode' flags while doing this. |
| 1009 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1010 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1011 | png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, |
| 1012 | png_alloc_size_t input_len, int flush) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1013 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1014 | if (png_ptr->zowner != png_IDAT) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1015 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1016 | /* First time. Ensure we have a temporary buffer for compression and |
| 1017 | * trim the buffer list if it has more than one entry to free memory. |
| 1018 | * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been |
| 1019 | * created at this point, but the check here is quick and safe. |
| 1020 | */ |
| 1021 | if (png_ptr->zbuffer_list == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1022 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1023 | png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp, |
| 1024 | png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); |
| 1025 | png_ptr->zbuffer_list->next = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1026 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1027 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1028 | else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1029 | png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next); |
| 1030 | |
| 1031 | /* It is a terminal error if we can't claim the zstream. */ |
| 1032 | if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK) |
| 1033 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1034 | |
| 1035 | /* The output state is maintained in png_ptr->zstream, so it must be |
| 1036 | * initialized here after the claim. |
| 1037 | */ |
| 1038 | png_ptr->zstream.next_out = png_ptr->zbuffer_list->output; |
| 1039 | png_ptr->zstream.avail_out = png_ptr->zbuffer_size; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1040 | } |
| 1041 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1042 | /* Now loop reading and writing until all the input is consumed or an error |
| 1043 | * terminates the operation. The _out values are maintained across calls to |
| 1044 | * this function, but the input must be reset each time. |
| 1045 | */ |
| 1046 | png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); |
| 1047 | png_ptr->zstream.avail_in = 0; /* set below */ |
| 1048 | for (;;) |
| 1049 | { |
| 1050 | int ret; |
| 1051 | |
| 1052 | /* INPUT: from the row data */ |
| 1053 | uInt avail = ZLIB_IO_MAX; |
| 1054 | |
| 1055 | if (avail > input_len) |
| 1056 | avail = (uInt)input_len; /* safe because of the check */ |
| 1057 | |
| 1058 | png_ptr->zstream.avail_in = avail; |
| 1059 | input_len -= avail; |
| 1060 | |
| 1061 | ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush); |
| 1062 | |
| 1063 | /* Include as-yet unconsumed input */ |
| 1064 | input_len += png_ptr->zstream.avail_in; |
| 1065 | png_ptr->zstream.avail_in = 0; |
| 1066 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1067 | /* OUTPUT: write complete IDAT chunks when avail_out drops to zero. Note |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1068 | * that these two zstream fields are preserved across the calls, therefore |
| 1069 | * there is no need to set these up on entry to the loop. |
| 1070 | */ |
| 1071 | if (png_ptr->zstream.avail_out == 0) |
| 1072 | { |
| 1073 | png_bytep data = png_ptr->zbuffer_list->output; |
| 1074 | uInt size = png_ptr->zbuffer_size; |
| 1075 | |
| 1076 | /* Write an IDAT containing the data then reset the buffer. The |
| 1077 | * first IDAT may need deflate header optimization. |
| 1078 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1079 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 1080 | if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 && |
| 1081 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1082 | optimize_cmf(data, png_image_size(png_ptr)); |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1083 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1084 | |
| 1085 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1086 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 1087 | |
| 1088 | png_ptr->zstream.next_out = data; |
| 1089 | png_ptr->zstream.avail_out = size; |
| 1090 | |
| 1091 | /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with |
| 1092 | * the same flush parameter until it has finished output, for NO_FLUSH |
| 1093 | * it doesn't matter. |
| 1094 | */ |
| 1095 | if (ret == Z_OK && flush != Z_NO_FLUSH) |
| 1096 | continue; |
| 1097 | } |
| 1098 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1099 | /* The order of these checks doesn't matter much; it just affects which |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1100 | * possible error might be detected if multiple things go wrong at once. |
| 1101 | */ |
| 1102 | if (ret == Z_OK) /* most likely return code! */ |
| 1103 | { |
| 1104 | /* If all the input has been consumed then just return. If Z_FINISH |
| 1105 | * was used as the flush parameter something has gone wrong if we get |
| 1106 | * here. |
| 1107 | */ |
| 1108 | if (input_len == 0) |
| 1109 | { |
| 1110 | if (flush == Z_FINISH) |
| 1111 | png_error(png_ptr, "Z_OK on Z_FINISH with output space"); |
| 1112 | |
| 1113 | return; |
| 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | else if (ret == Z_STREAM_END && flush == Z_FINISH) |
| 1118 | { |
| 1119 | /* This is the end of the IDAT data; any pending output must be |
| 1120 | * flushed. For small PNG files we may still be at the beginning. |
| 1121 | */ |
| 1122 | png_bytep data = png_ptr->zbuffer_list->output; |
| 1123 | uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out; |
| 1124 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1125 | #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED |
| 1126 | if ((png_ptr->mode & PNG_HAVE_IDAT) == 0 && |
| 1127 | png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) |
| 1128 | optimize_cmf(data, png_image_size(png_ptr)); |
| 1129 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1130 | |
| 1131 | png_write_complete_chunk(png_ptr, png_IDAT, data, size); |
| 1132 | png_ptr->zstream.avail_out = 0; |
| 1133 | png_ptr->zstream.next_out = NULL; |
| 1134 | png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; |
| 1135 | |
| 1136 | png_ptr->zowner = 0; /* Release the stream */ |
| 1137 | return; |
| 1138 | } |
| 1139 | |
| 1140 | else |
| 1141 | { |
| 1142 | /* This is an error condition. */ |
| 1143 | png_zstream_error(png_ptr, ret); |
| 1144 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1145 | } |
| 1146 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1147 | } |
| 1148 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1149 | /* Write an IEND chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1150 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1151 | png_write_IEND(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1152 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1153 | png_debug(1, "in png_write_IEND"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1154 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1155 | png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1156 | png_ptr->mode |= PNG_HAVE_IEND; |
| 1157 | } |
| 1158 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1159 | #ifdef PNG_WRITE_gAMA_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1160 | /* Write a gAMA chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1161 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1162 | png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1163 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1164 | png_byte buf[4]; |
| 1165 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1166 | png_debug(1, "in png_write_gAMA"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1167 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1168 | /* file_gamma is saved in 1/100,000ths */ |
| 1169 | png_save_uint_32(buf, (png_uint_32)file_gamma); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1170 | png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1171 | } |
| 1172 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1173 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1174 | #ifdef PNG_WRITE_sRGB_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1175 | /* Write a sRGB chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1176 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1177 | png_write_sRGB(png_structrp png_ptr, int srgb_intent) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1178 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1179 | png_byte buf[1]; |
| 1180 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1181 | png_debug(1, "in png_write_sRGB"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1182 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1183 | if (srgb_intent >= PNG_sRGB_INTENT_LAST) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1184 | png_warning(png_ptr, |
| 1185 | "Invalid sRGB rendering intent specified"); |
| 1186 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1187 | buf[0]=(png_byte)srgb_intent; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1188 | png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1189 | } |
| 1190 | #endif |
| 1191 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1192 | #ifdef PNG_WRITE_iCCP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1193 | /* Write an iCCP chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1194 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1195 | png_write_iCCP(png_structrp png_ptr, png_const_charp name, |
| 1196 | png_const_bytep profile) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1197 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1198 | png_uint_32 name_len; |
| 1199 | png_uint_32 profile_len; |
| 1200 | png_byte new_name[81]; /* 1 byte for the compression byte */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1201 | compression_state comp; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1202 | png_uint_32 temp; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1203 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1204 | png_debug(1, "in png_write_iCCP"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1205 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1206 | /* These are all internal problems: the profile should have been checked |
| 1207 | * before when it was stored. |
| 1208 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1209 | if (profile == NULL) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1210 | png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1211 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1212 | profile_len = png_get_uint_32(profile); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1213 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1214 | if (profile_len < 132) |
| 1215 | png_error(png_ptr, "ICC profile too short"); |
| 1216 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1217 | temp = (png_uint_32) (*(profile+8)); |
| 1218 | if (temp > 3 && (profile_len & 0x03)) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1219 | png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); |
| 1220 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1221 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1222 | png_uint_32 embedded_profile_len = png_get_uint_32(profile); |
| 1223 | |
| 1224 | if (profile_len != embedded_profile_len) |
| 1225 | png_error(png_ptr, "Profile length does not match profile"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1226 | } |
| 1227 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1228 | name_len = png_check_keyword(png_ptr, name, new_name); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1229 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1230 | if (name_len == 0) |
| 1231 | png_error(png_ptr, "iCCP: invalid keyword"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1232 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1233 | new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1234 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1235 | /* Make sure we include the NULL after the name and the compression type */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1236 | ++name_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1237 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1238 | png_text_compress_init(&comp, profile, profile_len); |
| 1239 | |
| 1240 | /* Allow for keyword terminator and compression byte */ |
| 1241 | if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) |
| 1242 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1243 | |
| 1244 | png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len); |
| 1245 | |
| 1246 | png_write_chunk_data(png_ptr, new_name, name_len); |
| 1247 | |
| 1248 | png_write_compressed_data_out(png_ptr, &comp); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1249 | |
| 1250 | png_write_chunk_end(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1251 | } |
| 1252 | #endif |
| 1253 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1254 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1255 | /* Write a sPLT chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1256 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1257 | png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1258 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1259 | png_uint_32 name_len; |
| 1260 | png_byte new_name[80]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1261 | png_byte entrybuf[10]; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1262 | png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); |
| 1263 | png_size_t palette_size = entry_size * spalette->nentries; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1264 | png_sPLT_entryp ep; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1265 | #ifndef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1266 | int i; |
| 1267 | #endif |
| 1268 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1269 | png_debug(1, "in png_write_sPLT"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1270 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1271 | name_len = png_check_keyword(png_ptr, spalette->name, new_name); |
| 1272 | |
| 1273 | if (name_len == 0) |
| 1274 | png_error(png_ptr, "sPLT: invalid keyword"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1275 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1276 | /* Make sure we include the NULL after the name */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1277 | png_write_chunk_header(png_ptr, png_sPLT, |
| 1278 | (png_uint_32)(name_len + 2 + palette_size)); |
| 1279 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1280 | png_write_chunk_data(png_ptr, (png_bytep)new_name, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1281 | (png_size_t)(name_len + 1)); |
| 1282 | |
| 1283 | png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1284 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1285 | /* Loop through each palette entry, writing appropriately */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1286 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1287 | for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1288 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1289 | if (spalette->depth == 8) |
| 1290 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1291 | entrybuf[0] = (png_byte)ep->red; |
| 1292 | entrybuf[1] = (png_byte)ep->green; |
| 1293 | entrybuf[2] = (png_byte)ep->blue; |
| 1294 | entrybuf[3] = (png_byte)ep->alpha; |
| 1295 | png_save_uint_16(entrybuf + 4, ep->frequency); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1296 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1297 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1298 | else |
| 1299 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1300 | png_save_uint_16(entrybuf + 0, ep->red); |
| 1301 | png_save_uint_16(entrybuf + 2, ep->green); |
| 1302 | png_save_uint_16(entrybuf + 4, ep->blue); |
| 1303 | png_save_uint_16(entrybuf + 6, ep->alpha); |
| 1304 | png_save_uint_16(entrybuf + 8, ep->frequency); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1305 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1306 | |
| 1307 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1308 | } |
| 1309 | #else |
| 1310 | ep=spalette->entries; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1311 | for (i = 0; i>spalette->nentries; i++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1312 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1313 | if (spalette->depth == 8) |
| 1314 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1315 | entrybuf[0] = (png_byte)ep[i].red; |
| 1316 | entrybuf[1] = (png_byte)ep[i].green; |
| 1317 | entrybuf[2] = (png_byte)ep[i].blue; |
| 1318 | entrybuf[3] = (png_byte)ep[i].alpha; |
| 1319 | png_save_uint_16(entrybuf + 4, ep[i].frequency); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1320 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1321 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1322 | else |
| 1323 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1324 | png_save_uint_16(entrybuf + 0, ep[i].red); |
| 1325 | png_save_uint_16(entrybuf + 2, ep[i].green); |
| 1326 | png_save_uint_16(entrybuf + 4, ep[i].blue); |
| 1327 | png_save_uint_16(entrybuf + 6, ep[i].alpha); |
| 1328 | png_save_uint_16(entrybuf + 8, ep[i].frequency); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1329 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1330 | |
| 1331 | png_write_chunk_data(png_ptr, entrybuf, entry_size); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1332 | } |
| 1333 | #endif |
| 1334 | |
| 1335 | png_write_chunk_end(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1336 | } |
| 1337 | #endif |
| 1338 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1339 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1340 | /* Write the sBIT chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1341 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1342 | png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1343 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1344 | png_byte buf[4]; |
| 1345 | png_size_t size; |
| 1346 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1347 | png_debug(1, "in png_write_sBIT"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1348 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1349 | /* Make sure we don't depend upon the order of PNG_COLOR_8 */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1350 | if ((color_type & PNG_COLOR_MASK_COLOR) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1351 | { |
| 1352 | png_byte maxbits; |
| 1353 | |
| 1354 | maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 : |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1355 | png_ptr->usr_bit_depth); |
| 1356 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1357 | if (sbit->red == 0 || sbit->red > maxbits || |
| 1358 | sbit->green == 0 || sbit->green > maxbits || |
| 1359 | sbit->blue == 0 || sbit->blue > maxbits) |
| 1360 | { |
| 1361 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1362 | return; |
| 1363 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1364 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1365 | buf[0] = sbit->red; |
| 1366 | buf[1] = sbit->green; |
| 1367 | buf[2] = sbit->blue; |
| 1368 | size = 3; |
| 1369 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1370 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1371 | else |
| 1372 | { |
| 1373 | if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth) |
| 1374 | { |
| 1375 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1376 | return; |
| 1377 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1378 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1379 | buf[0] = sbit->gray; |
| 1380 | size = 1; |
| 1381 | } |
| 1382 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1383 | if ((color_type & PNG_COLOR_MASK_ALPHA) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1384 | { |
| 1385 | if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth) |
| 1386 | { |
| 1387 | png_warning(png_ptr, "Invalid sBIT depth specified"); |
| 1388 | return; |
| 1389 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1390 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1391 | buf[size++] = sbit->alpha; |
| 1392 | } |
| 1393 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1394 | png_write_complete_chunk(png_ptr, png_sBIT, buf, size); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1395 | } |
| 1396 | #endif |
| 1397 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1398 | #ifdef PNG_WRITE_cHRM_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1399 | /* Write the cHRM chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1400 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1401 | png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1402 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1403 | png_byte buf[32]; |
| 1404 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1405 | png_debug(1, "in png_write_cHRM"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1406 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1407 | /* Each value is saved in 1/100,000ths */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1408 | png_save_int_32(buf, xy->whitex); |
| 1409 | png_save_int_32(buf + 4, xy->whitey); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1410 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1411 | png_save_int_32(buf + 8, xy->redx); |
| 1412 | png_save_int_32(buf + 12, xy->redy); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1413 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1414 | png_save_int_32(buf + 16, xy->greenx); |
| 1415 | png_save_int_32(buf + 20, xy->greeny); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1416 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1417 | png_save_int_32(buf + 24, xy->bluex); |
| 1418 | png_save_int_32(buf + 28, xy->bluey); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1419 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1420 | png_write_complete_chunk(png_ptr, png_cHRM, buf, 32); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1421 | } |
| 1422 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1423 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1424 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1425 | /* Write the tRNS chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1426 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1427 | png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha, |
| 1428 | png_const_color_16p tran, int num_trans, int color_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1429 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1430 | png_byte buf[6]; |
| 1431 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1432 | png_debug(1, "in png_write_tRNS"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1433 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1434 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1435 | { |
| 1436 | if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette) |
| 1437 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1438 | png_app_warning(png_ptr, |
| 1439 | "Invalid number of transparent colors specified"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1440 | return; |
| 1441 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1442 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1443 | /* Write the chunk out as it is */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1444 | png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha, |
| 1445 | (png_size_t)num_trans); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1446 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1447 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1448 | else if (color_type == PNG_COLOR_TYPE_GRAY) |
| 1449 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1450 | /* One 16-bit value */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1451 | if (tran->gray >= (1 << png_ptr->bit_depth)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1452 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1453 | png_app_warning(png_ptr, |
| 1454 | "Ignoring attempt to write tRNS chunk out-of-range for bit_depth"); |
| 1455 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1456 | return; |
| 1457 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1458 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1459 | png_save_uint_16(buf, tran->gray); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1460 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1461 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1462 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1463 | else if (color_type == PNG_COLOR_TYPE_RGB) |
| 1464 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1465 | /* Three 16-bit values */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1466 | png_save_uint_16(buf, tran->red); |
| 1467 | png_save_uint_16(buf + 2, tran->green); |
| 1468 | png_save_uint_16(buf + 4, tran->blue); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1469 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1470 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1471 | #else |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1472 | if ((buf[0] | buf[2] | buf[4]) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1473 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1474 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1475 | png_app_warning(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1476 | "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8"); |
| 1477 | return; |
| 1478 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1479 | |
| 1480 | png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1481 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1482 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1483 | else |
| 1484 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1485 | png_app_warning(png_ptr, "Can't write tRNS with an alpha channel"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1486 | } |
| 1487 | } |
| 1488 | #endif |
| 1489 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1490 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1491 | /* Write the background chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1492 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1493 | png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1494 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1495 | png_byte buf[6]; |
| 1496 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1497 | png_debug(1, "in png_write_bKGD"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1498 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1499 | if (color_type == PNG_COLOR_TYPE_PALETTE) |
| 1500 | { |
| 1501 | if ( |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1502 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1503 | (png_ptr->num_palette != 0 || |
| 1504 | (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0) && |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1505 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1506 | back->index >= png_ptr->num_palette) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1507 | { |
| 1508 | png_warning(png_ptr, "Invalid background palette index"); |
| 1509 | return; |
| 1510 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1511 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1512 | buf[0] = back->index; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1513 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1514 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1515 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1516 | else if ((color_type & PNG_COLOR_MASK_COLOR) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1517 | { |
| 1518 | png_save_uint_16(buf, back->red); |
| 1519 | png_save_uint_16(buf + 2, back->green); |
| 1520 | png_save_uint_16(buf + 4, back->blue); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1521 | #ifdef PNG_WRITE_16BIT_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1522 | if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1523 | #else |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1524 | if ((buf[0] | buf[2] | buf[4]) != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1525 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1526 | { |
| 1527 | png_warning(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1528 | "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8"); |
| 1529 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1530 | return; |
| 1531 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1532 | |
| 1533 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1534 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1535 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1536 | else |
| 1537 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1538 | if (back->gray >= (1 << png_ptr->bit_depth)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1539 | { |
| 1540 | png_warning(png_ptr, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1541 | "Ignoring attempt to write bKGD chunk out-of-range for bit_depth"); |
| 1542 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1543 | return; |
| 1544 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1545 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1546 | png_save_uint_16(buf, back->gray); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1547 | png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1548 | } |
| 1549 | } |
| 1550 | #endif |
| 1551 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1552 | #ifdef PNG_WRITE_hIST_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1553 | /* Write the histogram */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1554 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1555 | png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1556 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1557 | int i; |
| 1558 | png_byte buf[3]; |
| 1559 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1560 | png_debug(1, "in png_write_hIST"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1561 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1562 | if (num_hist > (int)png_ptr->num_palette) |
| 1563 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1564 | png_debug2(3, "num_hist = %d, num_palette = %d", num_hist, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1565 | png_ptr->num_palette); |
| 1566 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1567 | png_warning(png_ptr, "Invalid number of histogram entries specified"); |
| 1568 | return; |
| 1569 | } |
| 1570 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1571 | png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2)); |
| 1572 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1573 | for (i = 0; i < num_hist; i++) |
| 1574 | { |
| 1575 | png_save_uint_16(buf, hist[i]); |
| 1576 | png_write_chunk_data(png_ptr, buf, (png_size_t)2); |
| 1577 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1578 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1579 | png_write_chunk_end(png_ptr); |
| 1580 | } |
| 1581 | #endif |
| 1582 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1583 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1584 | /* Write a tEXt chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1585 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1586 | png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
| 1587 | png_size_t text_len) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1588 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1589 | png_uint_32 key_len; |
| 1590 | png_byte new_key[80]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1591 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1592 | png_debug(1, "in png_write_tEXt"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1593 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1594 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1595 | |
| 1596 | if (key_len == 0) |
| 1597 | png_error(png_ptr, "tEXt: invalid keyword"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1598 | |
| 1599 | if (text == NULL || *text == '\0') |
| 1600 | text_len = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1601 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1602 | else |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1603 | text_len = strlen(text); |
| 1604 | |
| 1605 | if (text_len > PNG_UINT_31_MAX - (key_len+1)) |
| 1606 | png_error(png_ptr, "tEXt: text too long"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1607 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1608 | /* Make sure we include the 0 after the key */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1609 | png_write_chunk_header(png_ptr, png_tEXt, |
| 1610 | (png_uint_32)/*checked above*/(key_len + text_len + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1611 | /* |
| 1612 | * We leave it to the application to meet PNG-1.0 requirements on the |
| 1613 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
| 1614 | * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. |
| 1615 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
| 1616 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1617 | png_write_chunk_data(png_ptr, new_key, key_len + 1); |
| 1618 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1619 | if (text_len != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1620 | png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1621 | |
| 1622 | png_write_chunk_end(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1623 | } |
| 1624 | #endif |
| 1625 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1626 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1627 | /* Write a compressed text chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1628 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1629 | png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1630 | int compression) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1631 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1632 | png_uint_32 key_len; |
| 1633 | png_byte new_key[81]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1634 | compression_state comp; |
| 1635 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1636 | png_debug(1, "in png_write_zTXt"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1637 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1638 | if (compression == PNG_TEXT_COMPRESSION_NONE) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1639 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1640 | png_write_tEXt(png_ptr, key, text, 0); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1641 | return; |
| 1642 | } |
| 1643 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1644 | if (compression != PNG_TEXT_COMPRESSION_zTXt) |
| 1645 | png_error(png_ptr, "zTXt: invalid compression type"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1646 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1647 | key_len = png_check_keyword(png_ptr, key, new_key); |
| 1648 | |
| 1649 | if (key_len == 0) |
| 1650 | png_error(png_ptr, "zTXt: invalid keyword"); |
| 1651 | |
| 1652 | /* Add the compression method and 1 for the keyword separator. */ |
| 1653 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1654 | ++key_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1655 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1656 | /* Compute the compressed data; do it now for the length */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1657 | png_text_compress_init(&comp, (png_const_bytep)text, |
| 1658 | text == NULL ? 0 : strlen(text)); |
| 1659 | |
| 1660 | if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK) |
| 1661 | png_error(png_ptr, png_ptr->zstream.msg); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1662 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1663 | /* Write start of chunk */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1664 | png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1665 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1666 | /* Write key */ |
| 1667 | png_write_chunk_data(png_ptr, new_key, key_len); |
| 1668 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1669 | /* Write the compressed data */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1670 | png_write_compressed_data_out(png_ptr, &comp); |
| 1671 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1672 | /* Close the chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1673 | png_write_chunk_end(png_ptr); |
| 1674 | } |
| 1675 | #endif |
| 1676 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1677 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1678 | /* Write an iTXt chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1679 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1680 | png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key, |
| 1681 | png_const_charp lang, png_const_charp lang_key, png_const_charp text) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1682 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1683 | png_uint_32 key_len, prefix_len; |
| 1684 | png_size_t lang_len, lang_key_len; |
| 1685 | png_byte new_key[82]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1686 | compression_state comp; |
| 1687 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1688 | png_debug(1, "in png_write_iTXt"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1689 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1690 | key_len = png_check_keyword(png_ptr, key, new_key); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1691 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1692 | if (key_len == 0) |
| 1693 | png_error(png_ptr, "iTXt: invalid keyword"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1694 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1695 | /* Set the compression flag */ |
| 1696 | switch (compression) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1697 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1698 | case PNG_ITXT_COMPRESSION_NONE: |
| 1699 | case PNG_TEXT_COMPRESSION_NONE: |
| 1700 | compression = new_key[++key_len] = 0; /* no compression */ |
| 1701 | break; |
| 1702 | |
| 1703 | case PNG_TEXT_COMPRESSION_zTXt: |
| 1704 | case PNG_ITXT_COMPRESSION_zTXt: |
| 1705 | compression = new_key[++key_len] = 1; /* compressed */ |
| 1706 | break; |
| 1707 | |
| 1708 | default: |
| 1709 | png_error(png_ptr, "iTXt: invalid compression"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1710 | } |
| 1711 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1712 | new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; |
| 1713 | ++key_len; /* for the keywod separator */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1714 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1715 | /* We leave it to the application to meet PNG-1.0 requirements on the |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1716 | * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1717 | * any non-Latin-1 characters except for NEWLINE. ISO PNG, however, |
| 1718 | * specifies that the text is UTF-8 and this really doesn't require any |
| 1719 | * checking. |
| 1720 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1721 | * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1722 | * |
| 1723 | * TODO: validate the language tag correctly (see the spec.) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1724 | */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1725 | if (lang == NULL) lang = ""; /* empty language is valid */ |
| 1726 | lang_len = strlen(lang)+1; |
| 1727 | if (lang_key == NULL) lang_key = ""; /* may be empty */ |
| 1728 | lang_key_len = strlen(lang_key)+1; |
| 1729 | if (text == NULL) text = ""; /* may be empty */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1730 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1731 | prefix_len = key_len; |
| 1732 | if (lang_len > PNG_UINT_31_MAX-prefix_len) |
| 1733 | prefix_len = PNG_UINT_31_MAX; |
| 1734 | else |
| 1735 | prefix_len = (png_uint_32)(prefix_len + lang_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1736 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1737 | if (lang_key_len > PNG_UINT_31_MAX-prefix_len) |
| 1738 | prefix_len = PNG_UINT_31_MAX; |
| 1739 | else |
| 1740 | prefix_len = (png_uint_32)(prefix_len + lang_key_len); |
| 1741 | |
| 1742 | png_text_compress_init(&comp, (png_const_bytep)text, strlen(text)); |
| 1743 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1744 | if (compression != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1745 | { |
| 1746 | if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) |
| 1747 | png_error(png_ptr, png_ptr->zstream.msg); |
| 1748 | } |
| 1749 | |
| 1750 | else |
| 1751 | { |
| 1752 | if (comp.input_len > PNG_UINT_31_MAX-prefix_len) |
| 1753 | png_error(png_ptr, "iTXt: uncompressed text too long"); |
| 1754 | |
| 1755 | /* So the string will fit in a chunk: */ |
| 1756 | comp.output_len = (png_uint_32)/*SAFE*/comp.input_len; |
| 1757 | } |
| 1758 | |
| 1759 | png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len); |
| 1760 | |
| 1761 | png_write_chunk_data(png_ptr, new_key, key_len); |
| 1762 | |
| 1763 | png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len); |
| 1764 | |
| 1765 | png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len); |
| 1766 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1767 | if (compression != 0) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1768 | png_write_compressed_data_out(png_ptr, &comp); |
| 1769 | |
| 1770 | else |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1771 | png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.output_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1772 | |
| 1773 | png_write_chunk_end(png_ptr); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1774 | } |
| 1775 | #endif |
| 1776 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1777 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1778 | /* Write the oFFs chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1779 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1780 | png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset, |
| 1781 | int unit_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1782 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1783 | png_byte buf[9]; |
| 1784 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1785 | png_debug(1, "in png_write_oFFs"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1786 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1787 | if (unit_type >= PNG_OFFSET_LAST) |
| 1788 | png_warning(png_ptr, "Unrecognized unit type for oFFs chunk"); |
| 1789 | |
| 1790 | png_save_int_32(buf, x_offset); |
| 1791 | png_save_int_32(buf + 4, y_offset); |
| 1792 | buf[8] = (png_byte)unit_type; |
| 1793 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1794 | png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1795 | } |
| 1796 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1797 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1798 | /* Write the pCAL chunk (described in the PNG extensions document) */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1799 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1800 | png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0, |
| 1801 | png_int_32 X1, int type, int nparams, png_const_charp units, |
| 1802 | png_charpp params) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1803 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1804 | png_uint_32 purpose_len; |
| 1805 | png_size_t units_len, total_len; |
| 1806 | png_size_tp params_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1807 | png_byte buf[10]; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1808 | png_byte new_purpose[80]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1809 | int i; |
| 1810 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1811 | png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1812 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1813 | if (type >= PNG_EQUATION_LAST) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1814 | png_error(png_ptr, "Unrecognized equation type for pCAL chunk"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1815 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1816 | purpose_len = png_check_keyword(png_ptr, purpose, new_purpose); |
| 1817 | |
| 1818 | if (purpose_len == 0) |
| 1819 | png_error(png_ptr, "pCAL: invalid keyword"); |
| 1820 | |
| 1821 | ++purpose_len; /* terminator */ |
| 1822 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1823 | png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1824 | units_len = strlen(units) + (nparams == 0 ? 0 : 1); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1825 | png_debug1(3, "pCAL units length = %d", (int)units_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1826 | total_len = purpose_len + units_len + 10; |
| 1827 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1828 | params_len = (png_size_tp)png_malloc(png_ptr, |
| 1829 | (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1830 | |
| 1831 | /* Find the length of each parameter, making sure we don't count the |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1832 | * null terminator for the last parameter. |
| 1833 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1834 | for (i = 0; i < nparams; i++) |
| 1835 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1836 | params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1837 | png_debug2(3, "pCAL parameter %d length = %lu", i, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1838 | (unsigned long)params_len[i]); |
| 1839 | total_len += params_len[i]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1840 | } |
| 1841 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1842 | png_debug1(3, "pCAL total length = %d", (int)total_len); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1843 | png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len); |
| 1844 | png_write_chunk_data(png_ptr, new_purpose, purpose_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1845 | png_save_int_32(buf, X0); |
| 1846 | png_save_int_32(buf + 4, X1); |
| 1847 | buf[8] = (png_byte)type; |
| 1848 | buf[9] = (png_byte)nparams; |
| 1849 | png_write_chunk_data(png_ptr, buf, (png_size_t)10); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1850 | png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1851 | |
| 1852 | for (i = 0; i < nparams; i++) |
| 1853 | { |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1854 | png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1855 | } |
| 1856 | |
| 1857 | png_free(png_ptr, params_len); |
| 1858 | png_write_chunk_end(png_ptr); |
| 1859 | } |
| 1860 | #endif |
| 1861 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1862 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1863 | /* Write the sCAL chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1864 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1865 | png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width, |
| 1866 | png_const_charp height) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1867 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1868 | png_byte buf[64]; |
| 1869 | png_size_t wlen, hlen, total_len; |
| 1870 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1871 | png_debug(1, "in png_write_sCAL_s"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1872 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1873 | wlen = strlen(width); |
| 1874 | hlen = strlen(height); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1875 | total_len = wlen + hlen + 2; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1876 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1877 | if (total_len > 64) |
| 1878 | { |
| 1879 | png_warning(png_ptr, "Can't write sCAL (buffer too small)"); |
| 1880 | return; |
| 1881 | } |
| 1882 | |
| 1883 | buf[0] = (png_byte)unit; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1884 | memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ |
| 1885 | memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1886 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1887 | png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1888 | png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1889 | } |
| 1890 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1891 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1892 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1893 | /* Write the pHYs chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1894 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1895 | png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, |
| 1896 | png_uint_32 y_pixels_per_unit, |
| 1897 | int unit_type) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1898 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1899 | png_byte buf[9]; |
| 1900 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1901 | png_debug(1, "in png_write_pHYs"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1902 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1903 | if (unit_type >= PNG_RESOLUTION_LAST) |
| 1904 | png_warning(png_ptr, "Unrecognized unit type for pHYs chunk"); |
| 1905 | |
| 1906 | png_save_uint_32(buf, x_pixels_per_unit); |
| 1907 | png_save_uint_32(buf + 4, y_pixels_per_unit); |
| 1908 | buf[8] = (png_byte)unit_type; |
| 1909 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1910 | png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1911 | } |
| 1912 | #endif |
| 1913 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1914 | #ifdef PNG_WRITE_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1915 | /* Write the tIME chunk. Use either png_convert_from_struct_tm() |
| 1916 | * or png_convert_from_time_t(), or fill in the structure yourself. |
| 1917 | */ |
| 1918 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1919 | png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1920 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1921 | png_byte buf[7]; |
| 1922 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1923 | png_debug(1, "in png_write_tIME"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1924 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1925 | if (mod_time->month > 12 || mod_time->month < 1 || |
| 1926 | mod_time->day > 31 || mod_time->day < 1 || |
| 1927 | mod_time->hour > 23 || mod_time->second > 60) |
| 1928 | { |
| 1929 | png_warning(png_ptr, "Invalid time specified for tIME chunk"); |
| 1930 | return; |
| 1931 | } |
| 1932 | |
| 1933 | png_save_uint_16(buf, mod_time->year); |
| 1934 | buf[2] = mod_time->month; |
| 1935 | buf[3] = mod_time->day; |
| 1936 | buf[4] = mod_time->hour; |
| 1937 | buf[5] = mod_time->minute; |
| 1938 | buf[6] = mod_time->second; |
| 1939 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1940 | png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1941 | } |
| 1942 | #endif |
| 1943 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1944 | /* Initializes the row writing capability of libpng */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1945 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1946 | png_write_start_row(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1947 | { |
| 1948 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1949 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1950 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1951 | /* Start of interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1952 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1953 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1954 | /* Offset to next interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1955 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1956 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1957 | /* Start of interlace block in the y direction */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1958 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1959 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1960 | /* Offset to next interlace block in the y direction */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1961 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1962 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1963 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1964 | png_alloc_size_t buf_size; |
| 1965 | int usr_pixel_depth; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1966 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1967 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
| 1968 | png_byte filters; |
| 1969 | #endif |
| 1970 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1971 | png_debug(1, "in png_write_start_row"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1972 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1973 | usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth; |
| 1974 | buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1; |
| 1975 | |
| 1976 | /* 1.5.6: added to allow checking in the row write code. */ |
| 1977 | png_ptr->transformed_pixel_depth = png_ptr->pixel_depth; |
| 1978 | png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1979 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1980 | /* Set up row buffer */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1981 | png_ptr->row_buf = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size)); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1982 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1983 | png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE; |
| 1984 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1985 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1986 | filters = png_ptr->do_filter; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1987 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 1988 | if (png_ptr->height == 1) |
| 1989 | filters &= 0xff & ~(PNG_FILTER_UP|PNG_FILTER_AVG|PNG_FILTER_PAETH); |
| 1990 | |
| 1991 | if (png_ptr->width == 1) |
| 1992 | filters &= 0xff & ~(PNG_FILTER_SUB|PNG_FILTER_AVG|PNG_FILTER_PAETH); |
| 1993 | |
| 1994 | if (filters == 0) |
| 1995 | filters = PNG_FILTER_NONE; |
| 1996 | |
| 1997 | png_ptr->do_filter = filters; |
| 1998 | |
| 1999 | if (((filters & (PNG_FILTER_SUB | PNG_FILTER_UP | PNG_FILTER_AVG | |
| 2000 | PNG_FILTER_PAETH)) != 0) && png_ptr->try_row == NULL) |
| 2001 | { |
| 2002 | int num_filters = 0; |
| 2003 | |
| 2004 | png_ptr->try_row = png_voidcast(png_bytep, png_malloc(png_ptr, buf_size)); |
| 2005 | |
| 2006 | if (filters & PNG_FILTER_SUB) |
| 2007 | num_filters++; |
| 2008 | |
| 2009 | if (filters & PNG_FILTER_UP) |
| 2010 | num_filters++; |
| 2011 | |
| 2012 | if (filters & PNG_FILTER_AVG) |
| 2013 | num_filters++; |
| 2014 | |
| 2015 | if (filters & PNG_FILTER_PAETH) |
| 2016 | num_filters++; |
| 2017 | |
| 2018 | if (num_filters > 1) |
| 2019 | png_ptr->tst_row = png_voidcast(png_bytep, png_malloc(png_ptr, |
| 2020 | buf_size)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2021 | } |
| 2022 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2023 | /* We only need to keep the previous row if we are using one of the following |
| 2024 | * filters. |
| 2025 | */ |
| 2026 | if ((filters & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH)) != 0) |
| 2027 | png_ptr->prev_row = png_voidcast(png_bytep, |
| 2028 | png_calloc(png_ptr, buf_size)); |
| 2029 | #endif /* WRITE_FILTER */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2030 | |
| 2031 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2032 | /* If interlaced, we need to set up width and height of pass */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2033 | if (png_ptr->interlaced != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2034 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2035 | if ((png_ptr->transformations & PNG_INTERLACE) == 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2036 | { |
| 2037 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2038 | png_pass_ystart[0]) / png_pass_yinc[0]; |
| 2039 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2040 | png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 - |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2041 | png_pass_start[0]) / png_pass_inc[0]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2042 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2043 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2044 | else |
| 2045 | { |
| 2046 | png_ptr->num_rows = png_ptr->height; |
| 2047 | png_ptr->usr_width = png_ptr->width; |
| 2048 | } |
| 2049 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2050 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2051 | else |
| 2052 | #endif |
| 2053 | { |
| 2054 | png_ptr->num_rows = png_ptr->height; |
| 2055 | png_ptr->usr_width = png_ptr->width; |
| 2056 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2057 | } |
| 2058 | |
| 2059 | /* Internal use only. Called when finished processing a row of data. */ |
| 2060 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2061 | png_write_finish_row(png_structrp png_ptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2062 | { |
| 2063 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2064 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2065 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2066 | /* Start of interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2067 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2068 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2069 | /* Offset to next interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2070 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2071 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2072 | /* Start of interlace block in the y direction */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2073 | static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2074 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2075 | /* Offset to next interlace block in the y direction */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2076 | static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2077 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2078 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2079 | png_debug(1, "in png_write_finish_row"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2080 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2081 | /* Next row */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2082 | png_ptr->row_number++; |
| 2083 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2084 | /* See if we are done */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2085 | if (png_ptr->row_number < png_ptr->num_rows) |
| 2086 | return; |
| 2087 | |
| 2088 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2089 | /* If interlaced, go to next pass */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2090 | if (png_ptr->interlaced != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2091 | { |
| 2092 | png_ptr->row_number = 0; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2093 | if ((png_ptr->transformations & PNG_INTERLACE) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2094 | { |
| 2095 | png_ptr->pass++; |
| 2096 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2097 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2098 | else |
| 2099 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2100 | /* Loop until we find a non-zero width or height pass */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2101 | do |
| 2102 | { |
| 2103 | png_ptr->pass++; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2104 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2105 | if (png_ptr->pass >= 7) |
| 2106 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2107 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2108 | png_ptr->usr_width = (png_ptr->width + |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2109 | png_pass_inc[png_ptr->pass] - 1 - |
| 2110 | png_pass_start[png_ptr->pass]) / |
| 2111 | png_pass_inc[png_ptr->pass]; |
| 2112 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2113 | png_ptr->num_rows = (png_ptr->height + |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2114 | png_pass_yinc[png_ptr->pass] - 1 - |
| 2115 | png_pass_ystart[png_ptr->pass]) / |
| 2116 | png_pass_yinc[png_ptr->pass]; |
| 2117 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2118 | if ((png_ptr->transformations & PNG_INTERLACE) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2119 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2120 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2121 | } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0); |
| 2122 | |
| 2123 | } |
| 2124 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2125 | /* Reset the row above the image for the next pass */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2126 | if (png_ptr->pass < 7) |
| 2127 | { |
| 2128 | if (png_ptr->prev_row != NULL) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2129 | memset(png_ptr->prev_row, 0, |
| 2130 | (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* |
| 2131 | png_ptr->usr_bit_depth, png_ptr->width)) + 1); |
| 2132 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2133 | return; |
| 2134 | } |
| 2135 | } |
| 2136 | #endif |
| 2137 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2138 | /* If we get here, we've just written the last row, so we need |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2139 | to flush the compressor */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2140 | png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2141 | } |
| 2142 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2143 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2144 | /* Pick out the correct pixels for the interlace pass. |
| 2145 | * The basic idea here is to go through the row with a source |
| 2146 | * pointer and a destination pointer (sp and dp), and copy the |
| 2147 | * correct pixels for the pass. As the row gets compacted, |
| 2148 | * sp will always be >= dp, so we should never overwrite anything. |
| 2149 | * See the default: case for the easiest code to understand. |
| 2150 | */ |
| 2151 | void /* PRIVATE */ |
| 2152 | png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass) |
| 2153 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2154 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2155 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2156 | /* Start of interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2157 | static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2158 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2159 | /* Offset to next interlace block */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2160 | static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2161 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2162 | png_debug(1, "in png_do_write_interlace"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2163 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2164 | /* We don't have to do anything on the last pass (6) */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2165 | if (pass < 6) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2166 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2167 | /* Each pixel depth is handled separately */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2168 | switch (row_info->pixel_depth) |
| 2169 | { |
| 2170 | case 1: |
| 2171 | { |
| 2172 | png_bytep sp; |
| 2173 | png_bytep dp; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2174 | unsigned int shift; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2175 | int d; |
| 2176 | int value; |
| 2177 | png_uint_32 i; |
| 2178 | png_uint_32 row_width = row_info->width; |
| 2179 | |
| 2180 | dp = row; |
| 2181 | d = 0; |
| 2182 | shift = 7; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2183 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2184 | for (i = png_pass_start[pass]; i < row_width; |
| 2185 | i += png_pass_inc[pass]) |
| 2186 | { |
| 2187 | sp = row + (png_size_t)(i >> 3); |
| 2188 | value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01; |
| 2189 | d |= (value << shift); |
| 2190 | |
| 2191 | if (shift == 0) |
| 2192 | { |
| 2193 | shift = 7; |
| 2194 | *dp++ = (png_byte)d; |
| 2195 | d = 0; |
| 2196 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2197 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2198 | else |
| 2199 | shift--; |
| 2200 | |
| 2201 | } |
| 2202 | if (shift != 7) |
| 2203 | *dp = (png_byte)d; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2204 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2205 | break; |
| 2206 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2207 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2208 | case 2: |
| 2209 | { |
| 2210 | png_bytep sp; |
| 2211 | png_bytep dp; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2212 | unsigned int shift; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2213 | int d; |
| 2214 | int value; |
| 2215 | png_uint_32 i; |
| 2216 | png_uint_32 row_width = row_info->width; |
| 2217 | |
| 2218 | dp = row; |
| 2219 | shift = 6; |
| 2220 | d = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2221 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2222 | for (i = png_pass_start[pass]; i < row_width; |
| 2223 | i += png_pass_inc[pass]) |
| 2224 | { |
| 2225 | sp = row + (png_size_t)(i >> 2); |
| 2226 | value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03; |
| 2227 | d |= (value << shift); |
| 2228 | |
| 2229 | if (shift == 0) |
| 2230 | { |
| 2231 | shift = 6; |
| 2232 | *dp++ = (png_byte)d; |
| 2233 | d = 0; |
| 2234 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2235 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2236 | else |
| 2237 | shift -= 2; |
| 2238 | } |
| 2239 | if (shift != 6) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2240 | *dp = (png_byte)d; |
| 2241 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2242 | break; |
| 2243 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2244 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2245 | case 4: |
| 2246 | { |
| 2247 | png_bytep sp; |
| 2248 | png_bytep dp; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2249 | unsigned int shift; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2250 | int d; |
| 2251 | int value; |
| 2252 | png_uint_32 i; |
| 2253 | png_uint_32 row_width = row_info->width; |
| 2254 | |
| 2255 | dp = row; |
| 2256 | shift = 4; |
| 2257 | d = 0; |
| 2258 | for (i = png_pass_start[pass]; i < row_width; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2259 | i += png_pass_inc[pass]) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2260 | { |
| 2261 | sp = row + (png_size_t)(i >> 1); |
| 2262 | value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f; |
| 2263 | d |= (value << shift); |
| 2264 | |
| 2265 | if (shift == 0) |
| 2266 | { |
| 2267 | shift = 4; |
| 2268 | *dp++ = (png_byte)d; |
| 2269 | d = 0; |
| 2270 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2271 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2272 | else |
| 2273 | shift -= 4; |
| 2274 | } |
| 2275 | if (shift != 4) |
| 2276 | *dp = (png_byte)d; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2277 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2278 | break; |
| 2279 | } |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2280 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2281 | default: |
| 2282 | { |
| 2283 | png_bytep sp; |
| 2284 | png_bytep dp; |
| 2285 | png_uint_32 i; |
| 2286 | png_uint_32 row_width = row_info->width; |
| 2287 | png_size_t pixel_bytes; |
| 2288 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2289 | /* Start at the beginning */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2290 | dp = row; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2291 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2292 | /* Find out how many bytes each pixel takes up */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2293 | pixel_bytes = (row_info->pixel_depth >> 3); |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2294 | |
| 2295 | /* Loop through the row, only looking at the pixels that matter */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2296 | for (i = png_pass_start[pass]; i < row_width; |
| 2297 | i += png_pass_inc[pass]) |
| 2298 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2299 | /* Find out where the original pixel is */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2300 | sp = row + (png_size_t)i * pixel_bytes; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2301 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2302 | /* Move the pixel */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2303 | if (dp != sp) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2304 | memcpy(dp, sp, pixel_bytes); |
| 2305 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2306 | /* Next pixel */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2307 | dp += pixel_bytes; |
| 2308 | } |
| 2309 | break; |
| 2310 | } |
| 2311 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2312 | /* Set new row width */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2313 | row_info->width = (row_info->width + |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2314 | png_pass_inc[pass] - 1 - |
| 2315 | png_pass_start[pass]) / |
| 2316 | png_pass_inc[pass]; |
| 2317 | |
| 2318 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, |
| 2319 | row_info->width); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2320 | } |
| 2321 | } |
| 2322 | #endif |
| 2323 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2324 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2325 | /* This filters the row, chooses which filter to use, if it has not already |
| 2326 | * been specified by the application, and then writes the row out with the |
| 2327 | * chosen filter. |
| 2328 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2329 | static void /* PRIVATE */ |
Sireesh Tripurari | b478e66 | 2014-05-09 15:15:10 +0530 | [diff] [blame] | 2330 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2331 | png_size_t row_bytes); |
| 2332 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2333 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
| 2334 | static png_size_t /* PRIVATE */ |
| 2335 | png_setup_sub_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2336 | const png_size_t row_bytes, const png_size_t lmins) |
| 2337 | { |
| 2338 | png_bytep rp, dp, lp; |
| 2339 | png_size_t i; |
| 2340 | png_size_t sum = 0; |
| 2341 | int v; |
| 2342 | |
| 2343 | png_ptr->try_row[0] = PNG_FILTER_VALUE_SUB; |
| 2344 | |
| 2345 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1; i < bpp; |
| 2346 | i++, rp++, dp++) |
| 2347 | { |
| 2348 | v = *dp = *rp; |
| 2349 | sum += (v < 128) ? v : 256 - v; |
| 2350 | } |
| 2351 | |
| 2352 | for (lp = png_ptr->row_buf + 1; i < row_bytes; |
| 2353 | i++, rp++, lp++, dp++) |
| 2354 | { |
| 2355 | v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff); |
| 2356 | sum += (v < 128) ? v : 256 - v; |
| 2357 | |
| 2358 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2359 | break; |
| 2360 | } |
| 2361 | |
| 2362 | return (sum); |
| 2363 | } |
| 2364 | |
| 2365 | static png_size_t /* PRIVATE */ |
| 2366 | png_setup_up_row(png_structrp png_ptr, const png_size_t row_bytes, |
| 2367 | const png_size_t lmins) |
| 2368 | { |
| 2369 | png_bytep rp, dp, pp; |
| 2370 | png_size_t i; |
| 2371 | png_size_t sum = 0; |
| 2372 | int v; |
| 2373 | |
| 2374 | png_ptr->try_row[0] = PNG_FILTER_VALUE_UP; |
| 2375 | |
| 2376 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2377 | pp = png_ptr->prev_row + 1; i < row_bytes; |
| 2378 | i++, rp++, pp++, dp++) |
| 2379 | { |
| 2380 | v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff); |
| 2381 | sum += (v < 128) ? v : 256 - v; |
| 2382 | |
| 2383 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2384 | break; |
| 2385 | } |
| 2386 | |
| 2387 | return (sum); |
| 2388 | } |
| 2389 | |
| 2390 | static png_size_t /* PRIVATE */ |
| 2391 | png_setup_avg_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2392 | const png_size_t row_bytes, const png_size_t lmins) |
| 2393 | { |
| 2394 | png_bytep rp, dp, pp, lp; |
| 2395 | png_uint_32 i; |
| 2396 | png_size_t sum = 0; |
| 2397 | int v; |
| 2398 | |
| 2399 | png_ptr->try_row[0] = PNG_FILTER_VALUE_AVG; |
| 2400 | |
| 2401 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2402 | pp = png_ptr->prev_row + 1; i < bpp; i++) |
| 2403 | { |
| 2404 | v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff); |
| 2405 | |
| 2406 | sum += (v < 128) ? v : 256 - v; |
| 2407 | } |
| 2408 | |
| 2409 | for (lp = png_ptr->row_buf + 1; i < row_bytes; i++) |
| 2410 | { |
| 2411 | v = *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) |
| 2412 | & 0xff); |
| 2413 | |
| 2414 | sum += (v < 128) ? v : 256 - v; |
| 2415 | |
| 2416 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2417 | break; |
| 2418 | } |
| 2419 | |
| 2420 | return (sum); |
| 2421 | } |
| 2422 | |
| 2423 | static png_size_t /* PRIVATE */ |
| 2424 | png_setup_paeth_row(png_structrp png_ptr, const png_uint_32 bpp, |
| 2425 | const png_size_t row_bytes, const png_size_t lmins) |
| 2426 | { |
| 2427 | png_bytep rp, dp, pp, cp, lp; |
| 2428 | png_size_t i; |
| 2429 | png_size_t sum = 0; |
| 2430 | int v; |
| 2431 | |
| 2432 | png_ptr->try_row[0] = PNG_FILTER_VALUE_PAETH; |
| 2433 | |
| 2434 | for (i = 0, rp = png_ptr->row_buf + 1, dp = png_ptr->try_row + 1, |
| 2435 | pp = png_ptr->prev_row + 1; i < bpp; i++) |
| 2436 | { |
| 2437 | v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff); |
| 2438 | |
| 2439 | sum += (v < 128) ? v : 256 - v; |
| 2440 | } |
| 2441 | |
| 2442 | for (lp = png_ptr->row_buf + 1, cp = png_ptr->prev_row + 1; i < row_bytes; |
| 2443 | i++) |
| 2444 | { |
| 2445 | int a, b, c, pa, pb, pc, p; |
| 2446 | |
| 2447 | b = *pp++; |
| 2448 | c = *cp++; |
| 2449 | a = *lp++; |
| 2450 | |
| 2451 | p = b - c; |
| 2452 | pc = a - c; |
| 2453 | |
| 2454 | #ifdef PNG_USE_ABS |
| 2455 | pa = abs(p); |
| 2456 | pb = abs(pc); |
| 2457 | pc = abs(p + pc); |
| 2458 | #else |
| 2459 | pa = p < 0 ? -p : p; |
| 2460 | pb = pc < 0 ? -pc : pc; |
| 2461 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
| 2462 | #endif |
| 2463 | |
| 2464 | p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c; |
| 2465 | |
| 2466 | v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff); |
| 2467 | |
| 2468 | sum += (v < 128) ? v : 256 - v; |
| 2469 | |
| 2470 | if (sum > lmins) /* We are already worse, don't continue. */ |
| 2471 | break; |
| 2472 | } |
| 2473 | |
| 2474 | return (sum); |
| 2475 | } |
| 2476 | #endif /* WRITE_FILTER */ |
| 2477 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2478 | void /* PRIVATE */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2479 | png_write_find_filter(png_structrp png_ptr, png_row_infop row_info) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2480 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2481 | #ifndef PNG_WRITE_FILTER_SUPPORTED |
| 2482 | png_write_filtered_row(png_ptr, png_ptr->row_buf, row_info->rowbytes+1); |
| 2483 | #else |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2484 | png_byte filter_to_do = png_ptr->do_filter; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2485 | png_bytep row_buf; |
| 2486 | png_bytep best_row; |
| 2487 | png_uint_32 bpp; |
| 2488 | png_size_t mins; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2489 | png_size_t row_bytes = row_info->rowbytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2490 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2491 | png_debug(1, "in png_write_find_filter"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2492 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2493 | /* Find out how many bytes offset each pixel is */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2494 | bpp = (row_info->pixel_depth + 7) >> 3; |
| 2495 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2496 | row_buf = png_ptr->row_buf; |
| 2497 | mins = PNG_SIZE_MAX - 256/* so we can detect potential overflow of the |
| 2498 | running sum */; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2499 | |
| 2500 | /* The prediction method we use is to find which method provides the |
| 2501 | * smallest value when summing the absolute values of the distances |
| 2502 | * from zero, using anything >= 128 as negative numbers. This is known |
| 2503 | * as the "minimum sum of absolute differences" heuristic. Other |
| 2504 | * heuristics are the "weighted minimum sum of absolute differences" |
| 2505 | * (experimental and can in theory improve compression), and the "zlib |
| 2506 | * predictive" method (not implemented yet), which does test compressions |
| 2507 | * of lines using different filter methods, and then chooses the |
| 2508 | * (series of) filter(s) that give minimum compressed data size (VERY |
| 2509 | * computationally expensive). |
| 2510 | * |
| 2511 | * GRR 980525: consider also |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2512 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2513 | * (1) minimum sum of absolute differences from running average (i.e., |
| 2514 | * keep running sum of non-absolute differences & count of bytes) |
| 2515 | * [track dispersion, too? restart average if dispersion too large?] |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2516 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2517 | * (1b) minimum sum of absolute differences from sliding average, probably |
| 2518 | * with window size <= deflate window (usually 32K) |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2519 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2520 | * (2) minimum sum of squared differences from zero or running average |
| 2521 | * (i.e., ~ root-mean-square approach) |
| 2522 | */ |
| 2523 | |
| 2524 | |
| 2525 | /* We don't need to test the 'no filter' case if this is the only filter |
| 2526 | * that has been chosen, as it doesn't actually do anything to the data. |
| 2527 | */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2528 | best_row = png_ptr->row_buf; |
| 2529 | |
| 2530 | |
| 2531 | if ((filter_to_do & PNG_FILTER_NONE) != 0 && filter_to_do != PNG_FILTER_NONE) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2532 | { |
| 2533 | png_bytep rp; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2534 | png_size_t sum = 0; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2535 | png_size_t i; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2536 | int v; |
| 2537 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2538 | if (PNG_SIZE_MAX/128 <= row_bytes) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2539 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2540 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2541 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2542 | /* Check for overflow */ |
| 2543 | if (sum > PNG_SIZE_MAX/128 - 256) |
| 2544 | break; |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2545 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2546 | v = *rp; |
| 2547 | sum += (v < 128) ? v : 256 - v; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2548 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2549 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2550 | else /* Overflow is not possible */ |
| 2551 | { |
| 2552 | for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++) |
| 2553 | { |
| 2554 | v = *rp; |
| 2555 | sum += (v < 128) ? v : 256 - v; |
| 2556 | } |
| 2557 | } |
| 2558 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2559 | mins = sum; |
| 2560 | } |
| 2561 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2562 | /* Sub filter */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2563 | if (filter_to_do == PNG_FILTER_SUB) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2564 | /* It's the only filter so no testing is needed */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2565 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2566 | (void) png_setup_sub_row(png_ptr, bpp, row_bytes, mins); |
| 2567 | best_row = png_ptr->try_row; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2568 | } |
| 2569 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2570 | else if ((filter_to_do & PNG_FILTER_SUB) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2571 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2572 | png_size_t sum; |
| 2573 | png_size_t lmins = mins; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2574 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2575 | sum = png_setup_sub_row(png_ptr, bpp, row_bytes, lmins); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2576 | |
| 2577 | if (sum < mins) |
| 2578 | { |
| 2579 | mins = sum; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2580 | best_row = png_ptr->try_row; |
| 2581 | if (png_ptr->tst_row != NULL) |
| 2582 | { |
| 2583 | png_ptr->try_row = png_ptr->tst_row; |
| 2584 | png_ptr->tst_row = best_row; |
| 2585 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2586 | } |
| 2587 | } |
| 2588 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2589 | /* Up filter */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2590 | if (filter_to_do == PNG_FILTER_UP) |
| 2591 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2592 | (void) png_setup_up_row(png_ptr, row_bytes, mins); |
| 2593 | best_row = png_ptr->try_row; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2594 | } |
| 2595 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2596 | else if ((filter_to_do & PNG_FILTER_UP) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2597 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2598 | png_size_t sum; |
| 2599 | png_size_t lmins = mins; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2600 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2601 | sum = png_setup_up_row(png_ptr, row_bytes, lmins); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2602 | |
| 2603 | if (sum < mins) |
| 2604 | { |
| 2605 | mins = sum; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2606 | best_row = png_ptr->try_row; |
| 2607 | if (png_ptr->tst_row != NULL) |
| 2608 | { |
| 2609 | png_ptr->try_row = png_ptr->tst_row; |
| 2610 | png_ptr->tst_row = best_row; |
| 2611 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2612 | } |
| 2613 | } |
| 2614 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2615 | /* Avg filter */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2616 | if (filter_to_do == PNG_FILTER_AVG) |
| 2617 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2618 | (void) png_setup_avg_row(png_ptr, bpp, row_bytes, mins); |
| 2619 | best_row = png_ptr->try_row; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2620 | } |
| 2621 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2622 | else if ((filter_to_do & PNG_FILTER_AVG) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2623 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2624 | png_size_t sum; |
| 2625 | png_size_t lmins = mins; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2626 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2627 | sum= png_setup_avg_row(png_ptr, bpp, row_bytes, lmins); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2628 | |
| 2629 | if (sum < mins) |
| 2630 | { |
| 2631 | mins = sum; |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2632 | best_row = png_ptr->try_row; |
| 2633 | if (png_ptr->tst_row != NULL) |
| 2634 | { |
| 2635 | png_ptr->try_row = png_ptr->tst_row; |
| 2636 | png_ptr->tst_row = best_row; |
| 2637 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2638 | } |
| 2639 | } |
| 2640 | |
| 2641 | /* Paeth filter */ |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2642 | if ((filter_to_do == PNG_FILTER_PAETH) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2643 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2644 | (void) png_setup_paeth_row(png_ptr, bpp, row_bytes, mins); |
| 2645 | best_row = png_ptr->try_row; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2646 | } |
| 2647 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2648 | else if ((filter_to_do & PNG_FILTER_PAETH) != 0) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2649 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2650 | png_size_t sum; |
| 2651 | png_size_t lmins = mins; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2652 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2653 | sum = png_setup_paeth_row(png_ptr, bpp, row_bytes, lmins); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2654 | |
| 2655 | if (sum < mins) |
| 2656 | { |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2657 | best_row = png_ptr->try_row; |
| 2658 | if (png_ptr->tst_row != NULL) |
| 2659 | { |
| 2660 | png_ptr->try_row = png_ptr->tst_row; |
| 2661 | png_ptr->tst_row = best_row; |
| 2662 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2663 | } |
| 2664 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2665 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2666 | /* Do the actual writing of the filtered row data from the chosen filter. */ |
| 2667 | png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2668 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2669 | #endif /* WRITE_FILTER */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2670 | } |
| 2671 | |
| 2672 | |
| 2673 | /* Do the actual writing of a previously filtered row. */ |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2674 | static void |
| 2675 | png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, |
| 2676 | png_size_t full_row_length/*includes filter byte*/) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2677 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2678 | png_debug(1, "in png_write_filtered_row"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2679 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2680 | png_debug1(2, "filter = %d", filtered_row[0]); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2681 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 2682 | png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2683 | |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2684 | #ifdef PNG_WRITE_FILTER_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2685 | /* Swap the current and previous rows */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2686 | if (png_ptr->prev_row != NULL) |
| 2687 | { |
| 2688 | png_bytep tptr; |
| 2689 | |
| 2690 | tptr = png_ptr->prev_row; |
| 2691 | png_ptr->prev_row = png_ptr->row_buf; |
| 2692 | png_ptr->row_buf = tptr; |
| 2693 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2694 | #endif /* WRITE_FILTER */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2695 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2696 | /* Finish row - updates counters and flushes zlib if last row */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2697 | png_write_finish_row(png_ptr); |
| 2698 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2699 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2700 | png_ptr->flush_rows++; |
| 2701 | |
| 2702 | if (png_ptr->flush_dist > 0 && |
| 2703 | png_ptr->flush_rows >= png_ptr->flush_dist) |
| 2704 | { |
| 2705 | png_write_flush(png_ptr); |
| 2706 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2707 | #endif /* WRITE_FLUSH */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2708 | } |
Matt Sarett | 96be908 | 2016-05-03 13:29:54 -0400 | [diff] [blame^] | 2709 | #endif /* WRITE */ |