The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngrutil.c - utilities to read a PNG file |
| 3 | * |
Eric Vannier | 66dce0d | 2011-07-20 17:03:29 -0700 | [diff] [blame] | 4 | * Last changed in libpng 1.2.45 [July 7, 2011] |
| 5 | * Copyright (c) 1998-2011 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.) |
| 8 | * |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 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 |
| 12 | * |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 13 | * This file contains routines that are only called from within |
| 14 | * libpng itself during the course of reading an image. |
| 15 | */ |
| 16 | |
| 17 | #define PNG_INTERNAL |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 18 | #define PNG_NO_PEDANTIC_WARNINGS |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 19 | #include "png.h" |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 20 | #ifdef PNG_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 21 | |
| 22 | #if defined(_WIN32_WCE) && (_WIN32_WCE<0x500) |
| 23 | # define WIN32_WCE_OLD |
| 24 | #endif |
| 25 | |
| 26 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 27 | # ifdef WIN32_WCE_OLD |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 28 | /* The strtod() function is not supported on WindowsCE */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 29 | __inline double png_strtod(png_structp png_ptr, PNG_CONST char *nptr, |
| 30 | char **endptr) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 31 | { |
| 32 | double result = 0; |
| 33 | int len; |
| 34 | wchar_t *str, *end; |
| 35 | |
| 36 | len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 37 | str = (wchar_t *)png_malloc(png_ptr, len * png_sizeof(wchar_t)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 38 | if ( NULL != str ) |
| 39 | { |
| 40 | MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len); |
| 41 | result = wcstod(str, &end); |
| 42 | len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL); |
| 43 | *endptr = (char *)nptr + (png_strlen(nptr) - len + 1); |
| 44 | png_free(png_ptr, str); |
| 45 | } |
| 46 | return result; |
| 47 | } |
| 48 | # else |
| 49 | # define png_strtod(p,a,b) strtod(a,b) |
| 50 | # endif |
| 51 | #endif |
| 52 | |
| 53 | png_uint_32 PNGAPI |
| 54 | png_get_uint_31(png_structp png_ptr, png_bytep buf) |
| 55 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 56 | #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 57 | png_uint_32 i = png_get_uint_32(buf); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 58 | #else |
| 59 | /* Avoid an extra function call by inlining the result. */ |
| 60 | png_uint_32 i = ((png_uint_32)(*buf) << 24) + |
| 61 | ((png_uint_32)(*(buf + 1)) << 16) + |
| 62 | ((png_uint_32)(*(buf + 2)) << 8) + |
| 63 | (png_uint_32)(*(buf + 3)); |
| 64 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 65 | if (i > PNG_UINT_31_MAX) |
| 66 | png_error(png_ptr, "PNG unsigned integer out of range."); |
| 67 | return (i); |
| 68 | } |
| 69 | #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED |
| 70 | /* Grab an unsigned 32-bit integer from a buffer in big-endian format. */ |
| 71 | png_uint_32 PNGAPI |
| 72 | png_get_uint_32(png_bytep buf) |
| 73 | { |
| 74 | png_uint_32 i = ((png_uint_32)(*buf) << 24) + |
| 75 | ((png_uint_32)(*(buf + 1)) << 16) + |
| 76 | ((png_uint_32)(*(buf + 2)) << 8) + |
| 77 | (png_uint_32)(*(buf + 3)); |
| 78 | |
| 79 | return (i); |
| 80 | } |
| 81 | |
| 82 | /* Grab a signed 32-bit integer from a buffer in big-endian format. The |
| 83 | * data is stored in the PNG file in two's complement format, and it is |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 84 | * assumed that the machine format for signed integers is the same. |
| 85 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 86 | png_int_32 PNGAPI |
| 87 | png_get_int_32(png_bytep buf) |
| 88 | { |
| 89 | png_int_32 i = ((png_int_32)(*buf) << 24) + |
| 90 | ((png_int_32)(*(buf + 1)) << 16) + |
| 91 | ((png_int_32)(*(buf + 2)) << 8) + |
| 92 | (png_int_32)(*(buf + 3)); |
| 93 | |
| 94 | return (i); |
| 95 | } |
| 96 | |
| 97 | /* Grab an unsigned 16-bit integer from a buffer in big-endian format. */ |
| 98 | png_uint_16 PNGAPI |
| 99 | png_get_uint_16(png_bytep buf) |
| 100 | { |
| 101 | png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) + |
| 102 | (png_uint_16)(*(buf + 1))); |
| 103 | |
| 104 | return (i); |
| 105 | } |
| 106 | #endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */ |
| 107 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 108 | /* Read the chunk header (length + type name). |
| 109 | * Put the type name into png_ptr->chunk_name, and return the length. |
| 110 | */ |
| 111 | png_uint_32 /* PRIVATE */ |
| 112 | png_read_chunk_header(png_structp png_ptr) |
| 113 | { |
| 114 | png_byte buf[8]; |
| 115 | png_uint_32 length; |
| 116 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 117 | /* Read the length and the chunk name */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 118 | png_read_data(png_ptr, buf, 8); |
| 119 | length = png_get_uint_31(png_ptr, buf); |
| 120 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 121 | /* Put the chunk name into png_ptr->chunk_name */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 122 | png_memcpy(png_ptr->chunk_name, buf + 4, 4); |
| 123 | |
| 124 | png_debug2(0, "Reading %s chunk, length = %lu", |
| 125 | png_ptr->chunk_name, length); |
| 126 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 127 | /* Reset the crc and run it over the chunk name */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 128 | png_reset_crc(png_ptr); |
| 129 | png_calculate_crc(png_ptr, png_ptr->chunk_name, 4); |
| 130 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 131 | /* Check to see if chunk name is valid */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 132 | png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
| 133 | |
| 134 | return length; |
| 135 | } |
| 136 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 137 | /* Read data, and (optionally) run it through the CRC. */ |
| 138 | void /* PRIVATE */ |
| 139 | png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) |
| 140 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 141 | if (png_ptr == NULL) |
| 142 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 143 | png_read_data(png_ptr, buf, length); |
| 144 | png_calculate_crc(png_ptr, buf, length); |
| 145 | } |
| 146 | |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 147 | #ifdef PNG_INDEX_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 148 | /* Optionally skip data and then check the CRC. Depending on whether we |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 149 | * are reading a ancillary or critical chunk, and how the program has set |
| 150 | * things up, we may calculate the CRC on the data and print a message. |
| 151 | * Returns '1' if there was a CRC error, '0' otherwise. |
| 152 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 153 | int /* PRIVATE */ |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 154 | png_opt_crc_finish(png_structp png_ptr, png_uint_32 skip, int check_crc) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 155 | { |
| 156 | png_size_t i; |
| 157 | png_size_t istop = png_ptr->zbuf_size; |
| 158 | |
| 159 | for (i = (png_size_t)skip; i > istop; i -= istop) |
| 160 | { |
| 161 | png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); |
| 162 | } |
| 163 | if (i) |
| 164 | { |
| 165 | png_crc_read(png_ptr, png_ptr->zbuf, i); |
| 166 | } |
| 167 | |
| 168 | if (png_crc_error(png_ptr)) |
| 169 | { |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 170 | if (!check_crc) { |
| 171 | png_chunk_warning(png_ptr, "CRC error"); |
| 172 | return (1); |
| 173 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 174 | if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 175 | !(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) || |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 176 | (!(png_ptr->chunk_name[0] & 0x20) && /* Critical */ |
| 177 | (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))) |
| 178 | { |
| 179 | png_chunk_warning(png_ptr, "CRC error"); |
| 180 | } |
| 181 | else |
| 182 | { |
| 183 | png_chunk_error(png_ptr, "CRC error"); |
| 184 | } |
| 185 | return (1); |
| 186 | } |
| 187 | |
| 188 | return (0); |
| 189 | } |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 190 | #endif |
| 191 | |
| 192 | /* Optionally skip data and then check the CRC. Depending on whether we |
| 193 | * are reading a ancillary or critical chunk, and how the program has set |
| 194 | * things up, we may calculate the CRC on the data and print a message. |
| 195 | * Returns '1' if there was a CRC error, '0' otherwise. |
| 196 | */ |
| 197 | int /* PRIVATE */ |
| 198 | png_crc_finish(png_structp png_ptr, png_uint_32 skip) |
| 199 | { |
| 200 | return png_opt_crc_finish(png_ptr, skip, 1); |
| 201 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 202 | |
| 203 | /* Compare the CRC stored in the PNG file with that calculated by libpng from |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 204 | * the data it has read thus far. |
| 205 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 206 | int /* PRIVATE */ |
| 207 | png_crc_error(png_structp png_ptr) |
| 208 | { |
| 209 | png_byte crc_bytes[4]; |
| 210 | png_uint_32 crc; |
| 211 | int need_crc = 1; |
| 212 | |
| 213 | if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
| 214 | { |
| 215 | if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
| 216 | (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 217 | need_crc = 0; |
| 218 | } |
| 219 | else /* critical */ |
| 220 | { |
| 221 | if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 222 | need_crc = 0; |
| 223 | } |
| 224 | |
| 225 | png_read_data(png_ptr, crc_bytes, 4); |
| 226 | |
| 227 | if (need_crc) |
| 228 | { |
| 229 | crc = png_get_uint_32(crc_bytes); |
| 230 | return ((int)(crc != png_ptr->crc)); |
| 231 | } |
| 232 | else |
| 233 | return (0); |
| 234 | } |
| 235 | |
| 236 | #if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \ |
| 237 | defined(PNG_READ_iCCP_SUPPORTED) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 238 | static png_size_t |
| 239 | png_inflate(png_structp png_ptr, const png_byte *data, png_size_t size, |
| 240 | png_bytep output, png_size_t output_size) |
| 241 | { |
| 242 | png_size_t count = 0; |
| 243 | |
| 244 | png_ptr->zstream.next_in = (png_bytep)data; /* const_cast: VALID */ |
| 245 | png_ptr->zstream.avail_in = size; |
| 246 | |
| 247 | while (1) |
| 248 | { |
| 249 | int ret, avail; |
| 250 | |
| 251 | /* Reset the output buffer each time round - we empty it |
| 252 | * after every inflate call. |
| 253 | */ |
| 254 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 255 | png_ptr->zstream.avail_out = png_ptr->zbuf_size; |
| 256 | |
| 257 | ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); |
| 258 | avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 259 | |
| 260 | /* First copy/count any new output - but only if we didn't |
| 261 | * get an error code. |
| 262 | */ |
| 263 | if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0) |
| 264 | { |
| 265 | if (output != 0 && output_size > count) |
| 266 | { |
| 267 | int copy = output_size - count; |
| 268 | if (avail < copy) copy = avail; |
| 269 | png_memcpy(output + count, png_ptr->zbuf, copy); |
| 270 | } |
| 271 | count += avail; |
| 272 | } |
| 273 | |
| 274 | if (ret == Z_OK) |
| 275 | continue; |
| 276 | |
| 277 | /* Termination conditions - always reset the zstream, it |
| 278 | * must be left in inflateInit state. |
| 279 | */ |
| 280 | png_ptr->zstream.avail_in = 0; |
| 281 | inflateReset(&png_ptr->zstream); |
| 282 | |
| 283 | if (ret == Z_STREAM_END) |
| 284 | return count; /* NOTE: may be zero. */ |
| 285 | |
| 286 | /* Now handle the error codes - the API always returns 0 |
| 287 | * and the error message is dumped into the uncompressed |
| 288 | * buffer if available. |
| 289 | */ |
| 290 | { |
| 291 | PNG_CONST char *msg; |
| 292 | if (png_ptr->zstream.msg != 0) |
| 293 | msg = png_ptr->zstream.msg; |
| 294 | else |
| 295 | { |
| 296 | #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE) |
| 297 | char umsg[52]; |
| 298 | |
| 299 | switch (ret) |
| 300 | { |
| 301 | case Z_BUF_ERROR: |
| 302 | msg = "Buffer error in compressed datastream in %s chunk"; |
| 303 | break; |
| 304 | case Z_DATA_ERROR: |
| 305 | msg = "Data error in compressed datastream in %s chunk"; |
| 306 | break; |
| 307 | default: |
| 308 | msg = "Incomplete compressed datastream in %s chunk"; |
| 309 | break; |
| 310 | } |
| 311 | |
| 312 | png_snprintf(umsg, sizeof umsg, msg, png_ptr->chunk_name); |
| 313 | msg = umsg; |
| 314 | #else |
| 315 | msg = "Damaged compressed datastream in chunk other than IDAT"; |
| 316 | #endif |
| 317 | } |
| 318 | |
| 319 | png_warning(png_ptr, msg); |
| 320 | } |
| 321 | |
| 322 | /* 0 means an error - notice that this code simple ignores |
| 323 | * zero length compressed chunks as a result. |
| 324 | */ |
| 325 | return 0; |
| 326 | } |
| 327 | } |
| 328 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 329 | /* |
| 330 | * Decompress trailing data in a chunk. The assumption is that chunkdata |
| 331 | * points at an allocated area holding the contents of a chunk with a |
| 332 | * trailing compressed part. What we get back is an allocated area |
| 333 | * holding the original prefix part and an uncompressed version of the |
| 334 | * trailing part (the malloc area passed in is freed). |
| 335 | */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 336 | void /* PRIVATE */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 337 | png_decompress_chunk(png_structp png_ptr, int comp_type, |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 338 | png_size_t chunklength, |
| 339 | png_size_t prefix_size, png_size_t *newlength) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 340 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 341 | /* The caller should guarantee this */ |
| 342 | if (prefix_size > chunklength) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 343 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 344 | /* The recovery is to delete the chunk. */ |
| 345 | png_warning(png_ptr, "invalid chunklength"); |
| 346 | prefix_size = 0; /* To delete everything */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 347 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 348 | |
| 349 | else if (comp_type == PNG_COMPRESSION_TYPE_BASE) |
| 350 | { |
| 351 | png_size_t expanded_size = png_inflate(png_ptr, |
| 352 | (png_bytep)(png_ptr->chunkdata + prefix_size), |
| 353 | chunklength - prefix_size, |
| 354 | 0/*output*/, 0/*output size*/); |
| 355 | |
| 356 | /* Now check the limits on this chunk - if the limit fails the |
| 357 | * compressed data will be removed, the prefix will remain. |
| 358 | */ |
| 359 | #ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED |
| 360 | if (png_ptr->user_chunk_malloc_max && |
| 361 | (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1)) |
| 362 | #else |
| 363 | # ifdef PNG_USER_CHUNK_MALLOC_MAX |
| 364 | if ((PNG_USER_CHUNK_MALLOC_MAX > 0) && |
| 365 | prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1) |
| 366 | # endif |
| 367 | #endif |
| 368 | png_warning(png_ptr, "Exceeded size limit while expanding chunk"); |
| 369 | |
| 370 | /* If the size is zero either there was an error and a message |
| 371 | * has already been output (warning) or the size really is zero |
| 372 | * and we have nothing to do - the code will exit through the |
| 373 | * error case below. |
| 374 | */ |
| 375 | #if defined(PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED) || \ |
| 376 | defined(PNG_USER_CHUNK_MALLOC_MAX) |
| 377 | else |
| 378 | #endif |
| 379 | if (expanded_size > 0) |
| 380 | { |
| 381 | /* Success (maybe) - really uncompress the chunk. */ |
| 382 | png_size_t new_size = 0; |
Dave Burke | ccee121 | 2012-03-05 22:36:13 -0800 | [diff] [blame^] | 383 | png_charp text = NULL; |
| 384 | |
| 385 | /* Need to check for both truncation (64-bit) and integer overflow. */ |
| 386 | if (prefix_size + expanded_size > prefix_size && |
| 387 | prefix_size + expanded_size < 0xffffffffU) |
| 388 | { |
| 389 | text = png_malloc_warn(png_ptr, prefix_size + expanded_size + 1); |
| 390 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 391 | |
| 392 | if (text != NULL) |
| 393 | { |
| 394 | png_memcpy(text, png_ptr->chunkdata, prefix_size); |
| 395 | new_size = png_inflate(png_ptr, |
| 396 | (png_bytep)(png_ptr->chunkdata + prefix_size), |
| 397 | chunklength - prefix_size, |
| 398 | (png_bytep)(text + prefix_size), expanded_size); |
| 399 | text[prefix_size + expanded_size] = 0; /* just in case */ |
| 400 | |
| 401 | if (new_size == expanded_size) |
| 402 | { |
| 403 | png_free(png_ptr, png_ptr->chunkdata); |
| 404 | png_ptr->chunkdata = text; |
| 405 | *newlength = prefix_size + expanded_size; |
| 406 | return; /* The success return! */ |
| 407 | } |
| 408 | |
| 409 | png_warning(png_ptr, "png_inflate logic error"); |
| 410 | png_free(png_ptr, text); |
| 411 | } |
| 412 | else |
| 413 | png_warning(png_ptr, "Not enough memory to decompress chunk."); |
| 414 | } |
| 415 | } |
| 416 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 417 | else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ |
| 418 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 419 | #if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 420 | char umsg[50]; |
| 421 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 422 | png_snprintf(umsg, sizeof umsg, "Unknown zTXt compression type %d", |
| 423 | comp_type); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 424 | png_warning(png_ptr, umsg); |
| 425 | #else |
| 426 | png_warning(png_ptr, "Unknown zTXt compression type"); |
| 427 | #endif |
| 428 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 429 | /* The recovery is to simply drop the data. */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 430 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 431 | |
| 432 | /* Generic error return - leave the prefix, delete the compressed |
| 433 | * data, reallocate the chunkdata to remove the potentially large |
| 434 | * amount of compressed data. |
| 435 | */ |
| 436 | { |
| 437 | png_charp text = png_malloc_warn(png_ptr, prefix_size + 1); |
| 438 | if (text != NULL) |
| 439 | { |
| 440 | if (prefix_size > 0) |
| 441 | png_memcpy(text, png_ptr->chunkdata, prefix_size); |
| 442 | png_free(png_ptr, png_ptr->chunkdata); |
| 443 | png_ptr->chunkdata = text; |
| 444 | |
| 445 | /* This is an extra zero in the 'uncompressed' part. */ |
| 446 | *(png_ptr->chunkdata + prefix_size) = 0x00; |
| 447 | } |
| 448 | /* Ignore a malloc error here - it is safe. */ |
| 449 | } |
| 450 | |
| 451 | *newlength = prefix_size; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 452 | } |
| 453 | #endif |
| 454 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 455 | /* Read and check the IDHR chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 456 | void /* PRIVATE */ |
| 457 | png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 458 | { |
| 459 | png_byte buf[13]; |
| 460 | png_uint_32 width, height; |
| 461 | int bit_depth, color_type, compression_type, filter_type; |
| 462 | int interlace_type; |
| 463 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 464 | png_debug(1, "in png_handle_IHDR"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 465 | |
| 466 | if (png_ptr->mode & PNG_HAVE_IHDR) |
| 467 | png_error(png_ptr, "Out of place IHDR"); |
| 468 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 469 | /* Check the length */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 470 | if (length != 13) |
| 471 | png_error(png_ptr, "Invalid IHDR chunk"); |
| 472 | |
| 473 | png_ptr->mode |= PNG_HAVE_IHDR; |
| 474 | |
| 475 | png_crc_read(png_ptr, buf, 13); |
| 476 | png_crc_finish(png_ptr, 0); |
| 477 | |
| 478 | width = png_get_uint_31(png_ptr, buf); |
| 479 | height = png_get_uint_31(png_ptr, buf + 4); |
| 480 | bit_depth = buf[8]; |
| 481 | color_type = buf[9]; |
| 482 | compression_type = buf[10]; |
| 483 | filter_type = buf[11]; |
| 484 | interlace_type = buf[12]; |
| 485 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 486 | /* Set internal variables */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 487 | png_ptr->width = width; |
| 488 | png_ptr->height = height; |
| 489 | png_ptr->bit_depth = (png_byte)bit_depth; |
| 490 | png_ptr->interlaced = (png_byte)interlace_type; |
| 491 | png_ptr->color_type = (png_byte)color_type; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 492 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 493 | png_ptr->filter_type = (png_byte)filter_type; |
| 494 | #endif |
| 495 | png_ptr->compression_type = (png_byte)compression_type; |
| 496 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 497 | /* Find number of channels */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 498 | switch (png_ptr->color_type) |
| 499 | { |
| 500 | case PNG_COLOR_TYPE_GRAY: |
| 501 | case PNG_COLOR_TYPE_PALETTE: |
| 502 | png_ptr->channels = 1; |
| 503 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 504 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 505 | case PNG_COLOR_TYPE_RGB: |
| 506 | png_ptr->channels = 3; |
| 507 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 508 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 509 | case PNG_COLOR_TYPE_GRAY_ALPHA: |
| 510 | png_ptr->channels = 2; |
| 511 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 512 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 513 | case PNG_COLOR_TYPE_RGB_ALPHA: |
| 514 | png_ptr->channels = 4; |
| 515 | break; |
| 516 | } |
| 517 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 518 | /* Set up other useful info */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 519 | png_ptr->pixel_depth = (png_byte)(png_ptr->bit_depth * |
| 520 | png_ptr->channels); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 521 | png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->width); |
| 522 | png_debug1(3, "bit_depth = %d", png_ptr->bit_depth); |
| 523 | png_debug1(3, "channels = %d", png_ptr->channels); |
| 524 | png_debug1(3, "rowbytes = %lu", png_ptr->rowbytes); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 525 | png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, |
| 526 | color_type, interlace_type, compression_type, filter_type); |
| 527 | } |
| 528 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 529 | /* Read and check the palette */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 530 | void /* PRIVATE */ |
| 531 | png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 532 | { |
| 533 | png_color palette[PNG_MAX_PALETTE_LENGTH]; |
| 534 | int num, i; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 535 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 536 | png_colorp pal_ptr; |
| 537 | #endif |
| 538 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 539 | png_debug(1, "in png_handle_PLTE"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 540 | |
| 541 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 542 | png_error(png_ptr, "Missing IHDR before PLTE"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 543 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 544 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 545 | { |
| 546 | png_warning(png_ptr, "Invalid PLTE after IDAT"); |
| 547 | png_crc_finish(png_ptr, length); |
| 548 | return; |
| 549 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 550 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 551 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 552 | png_error(png_ptr, "Duplicate PLTE chunk"); |
| 553 | |
| 554 | png_ptr->mode |= PNG_HAVE_PLTE; |
| 555 | |
| 556 | if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) |
| 557 | { |
| 558 | png_warning(png_ptr, |
| 559 | "Ignoring PLTE chunk in grayscale PNG"); |
| 560 | png_crc_finish(png_ptr, length); |
| 561 | return; |
| 562 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 563 | #ifndef PNG_READ_OPT_PLTE_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 564 | if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) |
| 565 | { |
| 566 | png_crc_finish(png_ptr, length); |
| 567 | return; |
| 568 | } |
| 569 | #endif |
| 570 | |
| 571 | if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) |
| 572 | { |
| 573 | if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) |
| 574 | { |
| 575 | png_warning(png_ptr, "Invalid palette chunk"); |
| 576 | png_crc_finish(png_ptr, length); |
| 577 | return; |
| 578 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 579 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 580 | else |
| 581 | { |
| 582 | png_error(png_ptr, "Invalid palette chunk"); |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | num = (int)length / 3; |
| 587 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 588 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 589 | for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++) |
| 590 | { |
| 591 | png_byte buf[3]; |
| 592 | |
| 593 | png_crc_read(png_ptr, buf, 3); |
| 594 | pal_ptr->red = buf[0]; |
| 595 | pal_ptr->green = buf[1]; |
| 596 | pal_ptr->blue = buf[2]; |
| 597 | } |
| 598 | #else |
| 599 | for (i = 0; i < num; i++) |
| 600 | { |
| 601 | png_byte buf[3]; |
| 602 | |
| 603 | png_crc_read(png_ptr, buf, 3); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 604 | /* Don't depend upon png_color being any order */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 605 | palette[i].red = buf[0]; |
| 606 | palette[i].green = buf[1]; |
| 607 | palette[i].blue = buf[2]; |
| 608 | } |
| 609 | #endif |
| 610 | |
| 611 | /* If we actually NEED the PLTE chunk (ie for a paletted image), we do |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 612 | * whatever the normal CRC configuration tells us. However, if we |
| 613 | * have an RGB image, the PLTE can be considered ancillary, so |
| 614 | * we will act as though it is. |
| 615 | */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 616 | #ifndef PNG_READ_OPT_PLTE_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 617 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 618 | #endif |
| 619 | { |
| 620 | png_crc_finish(png_ptr, 0); |
| 621 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 622 | #ifndef PNG_READ_OPT_PLTE_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 623 | else if (png_crc_error(png_ptr)) /* Only if we have a CRC error */ |
| 624 | { |
| 625 | /* If we don't want to use the data from an ancillary chunk, |
| 626 | we have two options: an error abort, or a warning and we |
| 627 | ignore the data in this chunk (which should be OK, since |
| 628 | it's considered ancillary for a RGB or RGBA image). */ |
| 629 | if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) |
| 630 | { |
| 631 | if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 632 | { |
| 633 | png_chunk_error(png_ptr, "CRC error"); |
| 634 | } |
| 635 | else |
| 636 | { |
| 637 | png_chunk_warning(png_ptr, "CRC error"); |
| 638 | return; |
| 639 | } |
| 640 | } |
| 641 | /* Otherwise, we (optionally) emit a warning and use the chunk. */ |
| 642 | else if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| 643 | { |
| 644 | png_chunk_warning(png_ptr, "CRC error"); |
| 645 | } |
| 646 | } |
| 647 | #endif |
| 648 | |
| 649 | png_set_PLTE(png_ptr, info_ptr, palette, num); |
| 650 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 651 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 652 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 653 | { |
| 654 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
| 655 | { |
| 656 | if (png_ptr->num_trans > (png_uint_16)num) |
| 657 | { |
| 658 | png_warning(png_ptr, "Truncating incorrect tRNS chunk length"); |
| 659 | png_ptr->num_trans = (png_uint_16)num; |
| 660 | } |
| 661 | if (info_ptr->num_trans > (png_uint_16)num) |
| 662 | { |
| 663 | png_warning(png_ptr, "Truncating incorrect info tRNS chunk length"); |
| 664 | info_ptr->num_trans = (png_uint_16)num; |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | #endif |
| 669 | |
| 670 | } |
| 671 | |
| 672 | void /* PRIVATE */ |
| 673 | png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 674 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 675 | png_debug(1, "in png_handle_IEND"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 676 | |
| 677 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) |
| 678 | { |
| 679 | png_error(png_ptr, "No image in file"); |
| 680 | } |
| 681 | |
| 682 | png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); |
| 683 | |
| 684 | if (length != 0) |
| 685 | { |
| 686 | png_warning(png_ptr, "Incorrect IEND chunk length"); |
| 687 | } |
| 688 | png_crc_finish(png_ptr, length); |
| 689 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 690 | info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 691 | } |
| 692 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 693 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 694 | void /* PRIVATE */ |
| 695 | png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 696 | { |
| 697 | png_fixed_point igamma; |
| 698 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 699 | float file_gamma; |
| 700 | #endif |
| 701 | png_byte buf[4]; |
| 702 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 703 | png_debug(1, "in png_handle_gAMA"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 704 | |
| 705 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 706 | png_error(png_ptr, "Missing IHDR before gAMA"); |
| 707 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 708 | { |
| 709 | png_warning(png_ptr, "Invalid gAMA after IDAT"); |
| 710 | png_crc_finish(png_ptr, length); |
| 711 | return; |
| 712 | } |
| 713 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 714 | /* Should be an error, but we can cope with it */ |
| 715 | png_warning(png_ptr, "Out of place gAMA chunk"); |
| 716 | |
| 717 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 718 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 719 | && !(info_ptr->valid & PNG_INFO_sRGB) |
| 720 | #endif |
| 721 | ) |
| 722 | { |
| 723 | png_warning(png_ptr, "Duplicate gAMA chunk"); |
| 724 | png_crc_finish(png_ptr, length); |
| 725 | return; |
| 726 | } |
| 727 | |
| 728 | if (length != 4) |
| 729 | { |
| 730 | png_warning(png_ptr, "Incorrect gAMA chunk length"); |
| 731 | png_crc_finish(png_ptr, length); |
| 732 | return; |
| 733 | } |
| 734 | |
| 735 | png_crc_read(png_ptr, buf, 4); |
| 736 | if (png_crc_finish(png_ptr, 0)) |
| 737 | return; |
| 738 | |
| 739 | igamma = (png_fixed_point)png_get_uint_32(buf); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 740 | /* Check for zero gamma */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 741 | if (igamma == 0) |
| 742 | { |
| 743 | png_warning(png_ptr, |
| 744 | "Ignoring gAMA chunk with gamma=0"); |
| 745 | return; |
| 746 | } |
| 747 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 748 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 749 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) |
| 750 | if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) |
| 751 | { |
| 752 | png_warning(png_ptr, |
| 753 | "Ignoring incorrect gAMA value when sRGB is also present"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 754 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 755 | fprintf(stderr, "gamma = (%d/100000)", (int)igamma); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 756 | #endif |
| 757 | return; |
| 758 | } |
| 759 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 760 | |
| 761 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 762 | file_gamma = (float)igamma / (float)100000.0; |
| 763 | # ifdef PNG_READ_GAMMA_SUPPORTED |
| 764 | png_ptr->gamma = file_gamma; |
| 765 | # endif |
| 766 | png_set_gAMA(png_ptr, info_ptr, file_gamma); |
| 767 | #endif |
| 768 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 769 | png_set_gAMA_fixed(png_ptr, info_ptr, igamma); |
| 770 | #endif |
| 771 | } |
| 772 | #endif |
| 773 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 774 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 775 | void /* PRIVATE */ |
| 776 | png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 777 | { |
| 778 | png_size_t truelen; |
| 779 | png_byte buf[4]; |
| 780 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 781 | png_debug(1, "in png_handle_sBIT"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 782 | |
| 783 | buf[0] = buf[1] = buf[2] = buf[3] = 0; |
| 784 | |
| 785 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 786 | png_error(png_ptr, "Missing IHDR before sBIT"); |
| 787 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 788 | { |
| 789 | png_warning(png_ptr, "Invalid sBIT after IDAT"); |
| 790 | png_crc_finish(png_ptr, length); |
| 791 | return; |
| 792 | } |
| 793 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 794 | { |
| 795 | /* Should be an error, but we can cope with it */ |
| 796 | png_warning(png_ptr, "Out of place sBIT chunk"); |
| 797 | } |
| 798 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) |
| 799 | { |
| 800 | png_warning(png_ptr, "Duplicate sBIT chunk"); |
| 801 | png_crc_finish(png_ptr, length); |
| 802 | return; |
| 803 | } |
| 804 | |
| 805 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 806 | truelen = 3; |
| 807 | else |
| 808 | truelen = (png_size_t)png_ptr->channels; |
| 809 | |
| 810 | if (length != truelen || length > 4) |
| 811 | { |
| 812 | png_warning(png_ptr, "Incorrect sBIT chunk length"); |
| 813 | png_crc_finish(png_ptr, length); |
| 814 | return; |
| 815 | } |
| 816 | |
| 817 | png_crc_read(png_ptr, buf, truelen); |
| 818 | if (png_crc_finish(png_ptr, 0)) |
| 819 | return; |
| 820 | |
| 821 | if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) |
| 822 | { |
| 823 | png_ptr->sig_bit.red = buf[0]; |
| 824 | png_ptr->sig_bit.green = buf[1]; |
| 825 | png_ptr->sig_bit.blue = buf[2]; |
| 826 | png_ptr->sig_bit.alpha = buf[3]; |
| 827 | } |
| 828 | else |
| 829 | { |
| 830 | png_ptr->sig_bit.gray = buf[0]; |
| 831 | png_ptr->sig_bit.red = buf[0]; |
| 832 | png_ptr->sig_bit.green = buf[0]; |
| 833 | png_ptr->sig_bit.blue = buf[0]; |
| 834 | png_ptr->sig_bit.alpha = buf[1]; |
| 835 | } |
| 836 | png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit)); |
| 837 | } |
| 838 | #endif |
| 839 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 840 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 841 | void /* PRIVATE */ |
| 842 | png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 843 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 844 | png_byte buf[32]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 845 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 846 | float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y; |
| 847 | #endif |
| 848 | png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, |
| 849 | int_y_green, int_x_blue, int_y_blue; |
| 850 | |
| 851 | png_uint_32 uint_x, uint_y; |
| 852 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 853 | png_debug(1, "in png_handle_cHRM"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 854 | |
| 855 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 856 | png_error(png_ptr, "Missing IHDR before cHRM"); |
| 857 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 858 | { |
| 859 | png_warning(png_ptr, "Invalid cHRM after IDAT"); |
| 860 | png_crc_finish(png_ptr, length); |
| 861 | return; |
| 862 | } |
| 863 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 864 | /* Should be an error, but we can cope with it */ |
| 865 | png_warning(png_ptr, "Missing PLTE before cHRM"); |
| 866 | |
| 867 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 868 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 869 | && !(info_ptr->valid & PNG_INFO_sRGB) |
| 870 | #endif |
| 871 | ) |
| 872 | { |
| 873 | png_warning(png_ptr, "Duplicate cHRM chunk"); |
| 874 | png_crc_finish(png_ptr, length); |
| 875 | return; |
| 876 | } |
| 877 | |
| 878 | if (length != 32) |
| 879 | { |
| 880 | png_warning(png_ptr, "Incorrect cHRM chunk length"); |
| 881 | png_crc_finish(png_ptr, length); |
| 882 | return; |
| 883 | } |
| 884 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 885 | png_crc_read(png_ptr, buf, 32); |
| 886 | if (png_crc_finish(png_ptr, 0)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 887 | return; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 888 | |
| 889 | uint_x = png_get_uint_32(buf); |
| 890 | uint_y = png_get_uint_32(buf + 4); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 891 | int_x_white = (png_fixed_point)uint_x; |
| 892 | int_y_white = (png_fixed_point)uint_y; |
| 893 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 894 | uint_x = png_get_uint_32(buf + 8); |
| 895 | uint_y = png_get_uint_32(buf + 12); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 896 | int_x_red = (png_fixed_point)uint_x; |
| 897 | int_y_red = (png_fixed_point)uint_y; |
| 898 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 899 | uint_x = png_get_uint_32(buf + 16); |
| 900 | uint_y = png_get_uint_32(buf + 20); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 901 | int_x_green = (png_fixed_point)uint_x; |
| 902 | int_y_green = (png_fixed_point)uint_y; |
| 903 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 904 | uint_x = png_get_uint_32(buf + 24); |
| 905 | uint_y = png_get_uint_32(buf + 28); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 906 | int_x_blue = (png_fixed_point)uint_x; |
| 907 | int_y_blue = (png_fixed_point)uint_y; |
| 908 | |
| 909 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 910 | white_x = (float)int_x_white / (float)100000.0; |
| 911 | white_y = (float)int_y_white / (float)100000.0; |
| 912 | red_x = (float)int_x_red / (float)100000.0; |
| 913 | red_y = (float)int_y_red / (float)100000.0; |
| 914 | green_x = (float)int_x_green / (float)100000.0; |
| 915 | green_y = (float)int_y_green / (float)100000.0; |
| 916 | blue_x = (float)int_x_blue / (float)100000.0; |
| 917 | blue_y = (float)int_y_blue / (float)100000.0; |
| 918 | #endif |
| 919 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 920 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 921 | if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB)) |
| 922 | { |
| 923 | if (PNG_OUT_OF_RANGE(int_x_white, 31270, 1000) || |
| 924 | PNG_OUT_OF_RANGE(int_y_white, 32900, 1000) || |
| 925 | PNG_OUT_OF_RANGE(int_x_red, 64000L, 1000) || |
| 926 | PNG_OUT_OF_RANGE(int_y_red, 33000, 1000) || |
| 927 | PNG_OUT_OF_RANGE(int_x_green, 30000, 1000) || |
| 928 | PNG_OUT_OF_RANGE(int_y_green, 60000L, 1000) || |
| 929 | PNG_OUT_OF_RANGE(int_x_blue, 15000, 1000) || |
| 930 | PNG_OUT_OF_RANGE(int_y_blue, 6000, 1000)) |
| 931 | { |
| 932 | png_warning(png_ptr, |
| 933 | "Ignoring incorrect cHRM value when sRGB is also present"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 934 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 935 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 936 | fprintf(stderr, "wx=%f, wy=%f, rx=%f, ry=%f\n", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 937 | white_x, white_y, red_x, red_y); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 938 | fprintf(stderr, "gx=%f, gy=%f, bx=%f, by=%f\n", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 939 | green_x, green_y, blue_x, blue_y); |
| 940 | #else |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 941 | fprintf(stderr, "wx=%ld, wy=%ld, rx=%ld, ry=%ld\n", |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 942 | (long)int_x_white, (long)int_y_white, |
| 943 | (long)int_x_red, (long)int_y_red); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 944 | fprintf(stderr, "gx=%ld, gy=%ld, bx=%ld, by=%ld\n", |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 945 | (long)int_x_green, (long)int_y_green, |
| 946 | (long)int_x_blue, (long)int_y_blue); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 947 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 948 | #endif /* PNG_CONSOLE_IO_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 949 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 950 | return; |
| 951 | } |
| 952 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 953 | |
| 954 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 955 | png_set_cHRM(png_ptr, info_ptr, |
| 956 | white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y); |
| 957 | #endif |
| 958 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 959 | png_set_cHRM_fixed(png_ptr, info_ptr, |
| 960 | int_x_white, int_y_white, int_x_red, int_y_red, int_x_green, |
| 961 | int_y_green, int_x_blue, int_y_blue); |
| 962 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 963 | } |
| 964 | #endif |
| 965 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 966 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 967 | void /* PRIVATE */ |
| 968 | png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 969 | { |
| 970 | int intent; |
| 971 | png_byte buf[1]; |
| 972 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 973 | png_debug(1, "in png_handle_sRGB"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 974 | |
| 975 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 976 | png_error(png_ptr, "Missing IHDR before sRGB"); |
| 977 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 978 | { |
| 979 | png_warning(png_ptr, "Invalid sRGB after IDAT"); |
| 980 | png_crc_finish(png_ptr, length); |
| 981 | return; |
| 982 | } |
| 983 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 984 | /* Should be an error, but we can cope with it */ |
| 985 | png_warning(png_ptr, "Out of place sRGB chunk"); |
| 986 | |
| 987 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) |
| 988 | { |
| 989 | png_warning(png_ptr, "Duplicate sRGB chunk"); |
| 990 | png_crc_finish(png_ptr, length); |
| 991 | return; |
| 992 | } |
| 993 | |
| 994 | if (length != 1) |
| 995 | { |
| 996 | png_warning(png_ptr, "Incorrect sRGB chunk length"); |
| 997 | png_crc_finish(png_ptr, length); |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | png_crc_read(png_ptr, buf, 1); |
| 1002 | if (png_crc_finish(png_ptr, 0)) |
| 1003 | return; |
| 1004 | |
| 1005 | intent = buf[0]; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1006 | /* Check for bad intent */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1007 | if (intent >= PNG_sRGB_INTENT_LAST) |
| 1008 | { |
| 1009 | png_warning(png_ptr, "Unknown sRGB intent"); |
| 1010 | return; |
| 1011 | } |
| 1012 | |
| 1013 | #if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) |
| 1014 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)) |
| 1015 | { |
| 1016 | png_fixed_point igamma; |
| 1017 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1018 | igamma=info_ptr->int_gamma; |
| 1019 | #else |
| 1020 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1021 | igamma=(png_fixed_point)(info_ptr->gamma * 100000.); |
| 1022 | # endif |
| 1023 | #endif |
| 1024 | if (PNG_OUT_OF_RANGE(igamma, 45500L, 500)) |
| 1025 | { |
| 1026 | png_warning(png_ptr, |
| 1027 | "Ignoring incorrect gAMA value when sRGB is also present"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1028 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1029 | # ifdef PNG_FIXED_POINT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1030 | fprintf(stderr, "incorrect gamma=(%d/100000)\n", |
| 1031 | (int)png_ptr->int_gamma); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1032 | # else |
| 1033 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1034 | fprintf(stderr, "incorrect gamma=%f\n", png_ptr->gamma); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1035 | # endif |
| 1036 | # endif |
| 1037 | #endif |
| 1038 | } |
| 1039 | } |
| 1040 | #endif /* PNG_READ_gAMA_SUPPORTED */ |
| 1041 | |
| 1042 | #ifdef PNG_READ_cHRM_SUPPORTED |
| 1043 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1044 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
| 1045 | if (PNG_OUT_OF_RANGE(info_ptr->int_x_white, 31270, 1000) || |
| 1046 | PNG_OUT_OF_RANGE(info_ptr->int_y_white, 32900, 1000) || |
| 1047 | PNG_OUT_OF_RANGE(info_ptr->int_x_red, 64000L, 1000) || |
| 1048 | PNG_OUT_OF_RANGE(info_ptr->int_y_red, 33000, 1000) || |
| 1049 | PNG_OUT_OF_RANGE(info_ptr->int_x_green, 30000, 1000) || |
| 1050 | PNG_OUT_OF_RANGE(info_ptr->int_y_green, 60000L, 1000) || |
| 1051 | PNG_OUT_OF_RANGE(info_ptr->int_x_blue, 15000, 1000) || |
| 1052 | PNG_OUT_OF_RANGE(info_ptr->int_y_blue, 6000, 1000)) |
| 1053 | { |
| 1054 | png_warning(png_ptr, |
| 1055 | "Ignoring incorrect cHRM value when sRGB is also present"); |
| 1056 | } |
| 1057 | #endif /* PNG_FIXED_POINT_SUPPORTED */ |
| 1058 | #endif /* PNG_READ_cHRM_SUPPORTED */ |
| 1059 | |
| 1060 | png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent); |
| 1061 | } |
| 1062 | #endif /* PNG_READ_sRGB_SUPPORTED */ |
| 1063 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1064 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1065 | void /* PRIVATE */ |
| 1066 | png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1067 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 1068 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1069 | png_byte compression_type; |
| 1070 | png_bytep pC; |
| 1071 | png_charp profile; |
| 1072 | png_uint_32 skip = 0; |
| 1073 | png_uint_32 profile_size, profile_length; |
| 1074 | png_size_t slength, prefix_length, data_length; |
| 1075 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1076 | png_debug(1, "in png_handle_iCCP"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1077 | |
| 1078 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1079 | png_error(png_ptr, "Missing IHDR before iCCP"); |
| 1080 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1081 | { |
| 1082 | png_warning(png_ptr, "Invalid iCCP after IDAT"); |
| 1083 | png_crc_finish(png_ptr, length); |
| 1084 | return; |
| 1085 | } |
| 1086 | else if (png_ptr->mode & PNG_HAVE_PLTE) |
| 1087 | /* Should be an error, but we can cope with it */ |
| 1088 | png_warning(png_ptr, "Out of place iCCP chunk"); |
| 1089 | |
| 1090 | if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)) |
| 1091 | { |
| 1092 | png_warning(png_ptr, "Duplicate iCCP chunk"); |
| 1093 | png_crc_finish(png_ptr, length); |
| 1094 | return; |
| 1095 | } |
| 1096 | |
| 1097 | #ifdef PNG_MAX_MALLOC_64K |
| 1098 | if (length > (png_uint_32)65535L) |
| 1099 | { |
| 1100 | png_warning(png_ptr, "iCCP chunk too large to fit in memory"); |
| 1101 | skip = length - (png_uint_32)65535L; |
| 1102 | length = (png_uint_32)65535L; |
| 1103 | } |
| 1104 | #endif |
| 1105 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1106 | png_free(png_ptr, png_ptr->chunkdata); |
| 1107 | png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1108 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1109 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1110 | |
| 1111 | if (png_crc_finish(png_ptr, skip)) |
| 1112 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1113 | png_free(png_ptr, png_ptr->chunkdata); |
| 1114 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1115 | return; |
| 1116 | } |
| 1117 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1118 | png_ptr->chunkdata[slength] = 0x00; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1119 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1120 | for (profile = png_ptr->chunkdata; *profile; profile++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1121 | /* Empty loop to find end of name */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1122 | |
| 1123 | ++profile; |
| 1124 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1125 | /* There should be at least one zero (the compression type byte) |
| 1126 | * following the separator, and we should be on it |
| 1127 | */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1128 | if ( profile >= png_ptr->chunkdata + slength - 1) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1129 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1130 | png_free(png_ptr, png_ptr->chunkdata); |
| 1131 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1132 | png_warning(png_ptr, "Malformed iCCP chunk"); |
| 1133 | return; |
| 1134 | } |
| 1135 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1136 | /* Compression_type should always be zero */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1137 | compression_type = *profile++; |
| 1138 | if (compression_type) |
| 1139 | { |
| 1140 | png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1141 | compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8 |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1142 | wrote nonzero) */ |
| 1143 | } |
| 1144 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1145 | prefix_length = profile - png_ptr->chunkdata; |
| 1146 | png_decompress_chunk(png_ptr, compression_type, |
| 1147 | slength, prefix_length, &data_length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1148 | |
| 1149 | profile_length = data_length - prefix_length; |
| 1150 | |
| 1151 | if ( prefix_length > data_length || profile_length < 4) |
| 1152 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1153 | png_free(png_ptr, png_ptr->chunkdata); |
| 1154 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1155 | png_warning(png_ptr, "Profile size field missing from iCCP chunk"); |
| 1156 | return; |
| 1157 | } |
| 1158 | |
| 1159 | /* Check the profile_size recorded in the first 32 bits of the ICC profile */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1160 | pC = (png_bytep)(png_ptr->chunkdata + prefix_length); |
| 1161 | profile_size = ((*(pC ))<<24) | |
| 1162 | ((*(pC + 1))<<16) | |
| 1163 | ((*(pC + 2))<< 8) | |
| 1164 | ((*(pC + 3)) ); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1165 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1166 | if (profile_size < profile_length) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1167 | profile_length = profile_size; |
| 1168 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1169 | if (profile_size > profile_length) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1170 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1171 | png_free(png_ptr, png_ptr->chunkdata); |
| 1172 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1173 | png_warning(png_ptr, "Ignoring truncated iCCP profile."); |
| 1174 | return; |
| 1175 | } |
| 1176 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1177 | png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata, |
| 1178 | compression_type, png_ptr->chunkdata + prefix_length, profile_length); |
| 1179 | png_free(png_ptr, png_ptr->chunkdata); |
| 1180 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1181 | } |
| 1182 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| 1183 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1184 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1185 | void /* PRIVATE */ |
| 1186 | png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1187 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 1188 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1189 | png_bytep entry_start; |
| 1190 | png_sPLT_t new_palette; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1191 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1192 | png_sPLT_entryp pp; |
| 1193 | #endif |
| 1194 | int data_length, entry_size, i; |
| 1195 | png_uint_32 skip = 0; |
| 1196 | png_size_t slength; |
| 1197 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1198 | png_debug(1, "in png_handle_sPLT"); |
| 1199 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1200 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 1201 | |
| 1202 | if (png_ptr->user_chunk_cache_max != 0) |
| 1203 | { |
| 1204 | if (png_ptr->user_chunk_cache_max == 1) |
| 1205 | { |
| 1206 | png_crc_finish(png_ptr, length); |
| 1207 | return; |
| 1208 | } |
| 1209 | if (--png_ptr->user_chunk_cache_max == 1) |
| 1210 | { |
| 1211 | png_warning(png_ptr, "No space in chunk cache for sPLT"); |
| 1212 | png_crc_finish(png_ptr, length); |
| 1213 | return; |
| 1214 | } |
| 1215 | } |
| 1216 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1217 | |
| 1218 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1219 | png_error(png_ptr, "Missing IHDR before sPLT"); |
| 1220 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1221 | { |
| 1222 | png_warning(png_ptr, "Invalid sPLT after IDAT"); |
| 1223 | png_crc_finish(png_ptr, length); |
| 1224 | return; |
| 1225 | } |
| 1226 | |
| 1227 | #ifdef PNG_MAX_MALLOC_64K |
| 1228 | if (length > (png_uint_32)65535L) |
| 1229 | { |
| 1230 | png_warning(png_ptr, "sPLT chunk too large to fit in memory"); |
| 1231 | skip = length - (png_uint_32)65535L; |
| 1232 | length = (png_uint_32)65535L; |
| 1233 | } |
| 1234 | #endif |
| 1235 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1236 | png_free(png_ptr, png_ptr->chunkdata); |
| 1237 | png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1238 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1239 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1240 | |
| 1241 | if (png_crc_finish(png_ptr, skip)) |
| 1242 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1243 | png_free(png_ptr, png_ptr->chunkdata); |
| 1244 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1245 | return; |
| 1246 | } |
| 1247 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1248 | png_ptr->chunkdata[slength] = 0x00; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1249 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1250 | for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; |
| 1251 | entry_start++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1252 | /* Empty loop to find end of name */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1253 | ++entry_start; |
| 1254 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1255 | /* A sample depth should follow the separator, and we should be on it */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1256 | if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1257 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1258 | png_free(png_ptr, png_ptr->chunkdata); |
| 1259 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1260 | png_warning(png_ptr, "malformed sPLT chunk"); |
| 1261 | return; |
| 1262 | } |
| 1263 | |
| 1264 | new_palette.depth = *entry_start++; |
| 1265 | entry_size = (new_palette.depth == 8 ? 6 : 10); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1266 | data_length = (slength - (entry_start - (png_bytep)png_ptr->chunkdata)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1267 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1268 | /* Integrity-check the data length */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1269 | if (data_length % entry_size) |
| 1270 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1271 | png_free(png_ptr, png_ptr->chunkdata); |
| 1272 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1273 | png_warning(png_ptr, "sPLT chunk has bad length"); |
| 1274 | return; |
| 1275 | } |
| 1276 | |
| 1277 | new_palette.nentries = (png_int_32) ( data_length / entry_size); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1278 | if ((png_uint_32) new_palette.nentries > |
| 1279 | (png_uint_32) (PNG_SIZE_MAX / png_sizeof(png_sPLT_entry))) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1280 | { |
| 1281 | png_warning(png_ptr, "sPLT chunk too long"); |
| 1282 | return; |
| 1283 | } |
| 1284 | new_palette.entries = (png_sPLT_entryp)png_malloc_warn( |
| 1285 | png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry)); |
| 1286 | if (new_palette.entries == NULL) |
| 1287 | { |
| 1288 | png_warning(png_ptr, "sPLT chunk requires too much memory"); |
| 1289 | return; |
| 1290 | } |
| 1291 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1292 | #ifdef PNG_POINTER_INDEXING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1293 | for (i = 0; i < new_palette.nentries; i++) |
| 1294 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1295 | pp = new_palette.entries + i; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1296 | |
| 1297 | if (new_palette.depth == 8) |
| 1298 | { |
| 1299 | pp->red = *entry_start++; |
| 1300 | pp->green = *entry_start++; |
| 1301 | pp->blue = *entry_start++; |
| 1302 | pp->alpha = *entry_start++; |
| 1303 | } |
| 1304 | else |
| 1305 | { |
| 1306 | pp->red = png_get_uint_16(entry_start); entry_start += 2; |
| 1307 | pp->green = png_get_uint_16(entry_start); entry_start += 2; |
| 1308 | pp->blue = png_get_uint_16(entry_start); entry_start += 2; |
| 1309 | pp->alpha = png_get_uint_16(entry_start); entry_start += 2; |
| 1310 | } |
| 1311 | pp->frequency = png_get_uint_16(entry_start); entry_start += 2; |
| 1312 | } |
| 1313 | #else |
| 1314 | pp = new_palette.entries; |
| 1315 | for (i = 0; i < new_palette.nentries; i++) |
| 1316 | { |
| 1317 | |
| 1318 | if (new_palette.depth == 8) |
| 1319 | { |
| 1320 | pp[i].red = *entry_start++; |
| 1321 | pp[i].green = *entry_start++; |
| 1322 | pp[i].blue = *entry_start++; |
| 1323 | pp[i].alpha = *entry_start++; |
| 1324 | } |
| 1325 | else |
| 1326 | { |
| 1327 | pp[i].red = png_get_uint_16(entry_start); entry_start += 2; |
| 1328 | pp[i].green = png_get_uint_16(entry_start); entry_start += 2; |
| 1329 | pp[i].blue = png_get_uint_16(entry_start); entry_start += 2; |
| 1330 | pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2; |
| 1331 | } |
| 1332 | pp->frequency = png_get_uint_16(entry_start); entry_start += 2; |
| 1333 | } |
| 1334 | #endif |
| 1335 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1336 | /* Discard all chunk data except the name and stash that */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1337 | new_palette.name = png_ptr->chunkdata; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1338 | |
| 1339 | png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); |
| 1340 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1341 | png_free(png_ptr, png_ptr->chunkdata); |
| 1342 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1343 | png_free(png_ptr, new_palette.entries); |
| 1344 | } |
| 1345 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| 1346 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1347 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1348 | void /* PRIVATE */ |
| 1349 | png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1350 | { |
| 1351 | png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; |
| 1352 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1353 | png_debug(1, "in png_handle_tRNS"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1354 | |
| 1355 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1356 | png_error(png_ptr, "Missing IHDR before tRNS"); |
| 1357 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1358 | { |
| 1359 | png_warning(png_ptr, "Invalid tRNS after IDAT"); |
| 1360 | png_crc_finish(png_ptr, length); |
| 1361 | return; |
| 1362 | } |
| 1363 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
| 1364 | { |
| 1365 | png_warning(png_ptr, "Duplicate tRNS chunk"); |
| 1366 | png_crc_finish(png_ptr, length); |
| 1367 | return; |
| 1368 | } |
| 1369 | |
| 1370 | if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 1371 | { |
| 1372 | png_byte buf[2]; |
| 1373 | |
| 1374 | if (length != 2) |
| 1375 | { |
| 1376 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1377 | png_crc_finish(png_ptr, length); |
| 1378 | return; |
| 1379 | } |
| 1380 | |
| 1381 | png_crc_read(png_ptr, buf, 2); |
| 1382 | png_ptr->num_trans = 1; |
| 1383 | png_ptr->trans_values.gray = png_get_uint_16(buf); |
| 1384 | } |
| 1385 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 1386 | { |
| 1387 | png_byte buf[6]; |
| 1388 | |
| 1389 | if (length != 6) |
| 1390 | { |
| 1391 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1392 | png_crc_finish(png_ptr, length); |
| 1393 | return; |
| 1394 | } |
| 1395 | png_crc_read(png_ptr, buf, (png_size_t)length); |
| 1396 | png_ptr->num_trans = 1; |
| 1397 | png_ptr->trans_values.red = png_get_uint_16(buf); |
| 1398 | png_ptr->trans_values.green = png_get_uint_16(buf + 2); |
| 1399 | png_ptr->trans_values.blue = png_get_uint_16(buf + 4); |
| 1400 | } |
| 1401 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1402 | { |
| 1403 | if (!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1404 | { |
| 1405 | /* Should be an error, but we can cope with it. */ |
| 1406 | png_warning(png_ptr, "Missing PLTE before tRNS"); |
| 1407 | } |
| 1408 | if (length > (png_uint_32)png_ptr->num_palette || |
| 1409 | length > PNG_MAX_PALETTE_LENGTH) |
| 1410 | { |
| 1411 | png_warning(png_ptr, "Incorrect tRNS chunk length"); |
| 1412 | png_crc_finish(png_ptr, length); |
| 1413 | return; |
| 1414 | } |
| 1415 | if (length == 0) |
| 1416 | { |
| 1417 | png_warning(png_ptr, "Zero length tRNS chunk"); |
| 1418 | png_crc_finish(png_ptr, length); |
| 1419 | return; |
| 1420 | } |
| 1421 | png_crc_read(png_ptr, readbuf, (png_size_t)length); |
| 1422 | png_ptr->num_trans = (png_uint_16)length; |
| 1423 | } |
| 1424 | else |
| 1425 | { |
| 1426 | png_warning(png_ptr, "tRNS chunk not allowed with alpha channel"); |
| 1427 | png_crc_finish(png_ptr, length); |
| 1428 | return; |
| 1429 | } |
| 1430 | |
| 1431 | if (png_crc_finish(png_ptr, 0)) |
| 1432 | { |
| 1433 | png_ptr->num_trans = 0; |
| 1434 | return; |
| 1435 | } |
| 1436 | |
| 1437 | png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, |
| 1438 | &(png_ptr->trans_values)); |
| 1439 | } |
| 1440 | #endif |
| 1441 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1442 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1443 | void /* PRIVATE */ |
| 1444 | png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1445 | { |
| 1446 | png_size_t truelen; |
| 1447 | png_byte buf[6]; |
| 1448 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1449 | png_debug(1, "in png_handle_bKGD"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1450 | |
| 1451 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1452 | png_error(png_ptr, "Missing IHDR before bKGD"); |
| 1453 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1454 | { |
| 1455 | png_warning(png_ptr, "Invalid bKGD after IDAT"); |
| 1456 | png_crc_finish(png_ptr, length); |
| 1457 | return; |
| 1458 | } |
| 1459 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 1460 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1461 | { |
| 1462 | png_warning(png_ptr, "Missing PLTE before bKGD"); |
| 1463 | png_crc_finish(png_ptr, length); |
| 1464 | return; |
| 1465 | } |
| 1466 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) |
| 1467 | { |
| 1468 | png_warning(png_ptr, "Duplicate bKGD chunk"); |
| 1469 | png_crc_finish(png_ptr, length); |
| 1470 | return; |
| 1471 | } |
| 1472 | |
| 1473 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1474 | truelen = 1; |
| 1475 | else if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) |
| 1476 | truelen = 6; |
| 1477 | else |
| 1478 | truelen = 2; |
| 1479 | |
| 1480 | if (length != truelen) |
| 1481 | { |
| 1482 | png_warning(png_ptr, "Incorrect bKGD chunk length"); |
| 1483 | png_crc_finish(png_ptr, length); |
| 1484 | return; |
| 1485 | } |
| 1486 | |
| 1487 | png_crc_read(png_ptr, buf, truelen); |
| 1488 | if (png_crc_finish(png_ptr, 0)) |
| 1489 | return; |
| 1490 | |
| 1491 | /* We convert the index value into RGB components so that we can allow |
| 1492 | * arbitrary RGB values for background when we have transparency, and |
| 1493 | * so it is easy to determine the RGB values of the background color |
| 1494 | * from the info_ptr struct. */ |
| 1495 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 1496 | { |
| 1497 | png_ptr->background.index = buf[0]; |
| 1498 | if (info_ptr && info_ptr->num_palette) |
| 1499 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1500 | if (buf[0] >= info_ptr->num_palette) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1501 | { |
| 1502 | png_warning(png_ptr, "Incorrect bKGD chunk index value"); |
| 1503 | return; |
| 1504 | } |
| 1505 | png_ptr->background.red = |
| 1506 | (png_uint_16)png_ptr->palette[buf[0]].red; |
| 1507 | png_ptr->background.green = |
| 1508 | (png_uint_16)png_ptr->palette[buf[0]].green; |
| 1509 | png_ptr->background.blue = |
| 1510 | (png_uint_16)png_ptr->palette[buf[0]].blue; |
| 1511 | } |
| 1512 | } |
| 1513 | else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */ |
| 1514 | { |
| 1515 | png_ptr->background.red = |
| 1516 | png_ptr->background.green = |
| 1517 | png_ptr->background.blue = |
| 1518 | png_ptr->background.gray = png_get_uint_16(buf); |
| 1519 | } |
| 1520 | else |
| 1521 | { |
| 1522 | png_ptr->background.red = png_get_uint_16(buf); |
| 1523 | png_ptr->background.green = png_get_uint_16(buf + 2); |
| 1524 | png_ptr->background.blue = png_get_uint_16(buf + 4); |
| 1525 | } |
| 1526 | |
| 1527 | png_set_bKGD(png_ptr, info_ptr, &(png_ptr->background)); |
| 1528 | } |
| 1529 | #endif |
| 1530 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1531 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1532 | void /* PRIVATE */ |
| 1533 | png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1534 | { |
| 1535 | unsigned int num, i; |
| 1536 | png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; |
| 1537 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1538 | png_debug(1, "in png_handle_hIST"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1539 | |
| 1540 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1541 | png_error(png_ptr, "Missing IHDR before hIST"); |
| 1542 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1543 | { |
| 1544 | png_warning(png_ptr, "Invalid hIST after IDAT"); |
| 1545 | png_crc_finish(png_ptr, length); |
| 1546 | return; |
| 1547 | } |
| 1548 | else if (!(png_ptr->mode & PNG_HAVE_PLTE)) |
| 1549 | { |
| 1550 | png_warning(png_ptr, "Missing PLTE before hIST"); |
| 1551 | png_crc_finish(png_ptr, length); |
| 1552 | return; |
| 1553 | } |
| 1554 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) |
| 1555 | { |
| 1556 | png_warning(png_ptr, "Duplicate hIST chunk"); |
| 1557 | png_crc_finish(png_ptr, length); |
| 1558 | return; |
| 1559 | } |
| 1560 | |
| 1561 | num = length / 2 ; |
| 1562 | if (num != (unsigned int) png_ptr->num_palette || num > |
| 1563 | (unsigned int) PNG_MAX_PALETTE_LENGTH) |
| 1564 | { |
| 1565 | png_warning(png_ptr, "Incorrect hIST chunk length"); |
| 1566 | png_crc_finish(png_ptr, length); |
| 1567 | return; |
| 1568 | } |
| 1569 | |
| 1570 | for (i = 0; i < num; i++) |
| 1571 | { |
| 1572 | png_byte buf[2]; |
| 1573 | |
| 1574 | png_crc_read(png_ptr, buf, 2); |
| 1575 | readbuf[i] = png_get_uint_16(buf); |
| 1576 | } |
| 1577 | |
| 1578 | if (png_crc_finish(png_ptr, 0)) |
| 1579 | return; |
| 1580 | |
| 1581 | png_set_hIST(png_ptr, info_ptr, readbuf); |
| 1582 | } |
| 1583 | #endif |
| 1584 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1585 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1586 | void /* PRIVATE */ |
| 1587 | png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1588 | { |
| 1589 | png_byte buf[9]; |
| 1590 | png_uint_32 res_x, res_y; |
| 1591 | int unit_type; |
| 1592 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1593 | png_debug(1, "in png_handle_pHYs"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1594 | |
| 1595 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1596 | png_error(png_ptr, "Missing IHDR before pHYs"); |
| 1597 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1598 | { |
| 1599 | png_warning(png_ptr, "Invalid pHYs after IDAT"); |
| 1600 | png_crc_finish(png_ptr, length); |
| 1601 | return; |
| 1602 | } |
| 1603 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| 1604 | { |
| 1605 | png_warning(png_ptr, "Duplicate pHYs chunk"); |
| 1606 | png_crc_finish(png_ptr, length); |
| 1607 | return; |
| 1608 | } |
| 1609 | |
| 1610 | if (length != 9) |
| 1611 | { |
| 1612 | png_warning(png_ptr, "Incorrect pHYs chunk length"); |
| 1613 | png_crc_finish(png_ptr, length); |
| 1614 | return; |
| 1615 | } |
| 1616 | |
| 1617 | png_crc_read(png_ptr, buf, 9); |
| 1618 | if (png_crc_finish(png_ptr, 0)) |
| 1619 | return; |
| 1620 | |
| 1621 | res_x = png_get_uint_32(buf); |
| 1622 | res_y = png_get_uint_32(buf + 4); |
| 1623 | unit_type = buf[8]; |
| 1624 | png_set_pHYs(png_ptr, info_ptr, res_x, res_y, unit_type); |
| 1625 | } |
| 1626 | #endif |
| 1627 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1628 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1629 | void /* PRIVATE */ |
| 1630 | png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1631 | { |
| 1632 | png_byte buf[9]; |
| 1633 | png_int_32 offset_x, offset_y; |
| 1634 | int unit_type; |
| 1635 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1636 | png_debug(1, "in png_handle_oFFs"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1637 | |
| 1638 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1639 | png_error(png_ptr, "Missing IHDR before oFFs"); |
| 1640 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1641 | { |
| 1642 | png_warning(png_ptr, "Invalid oFFs after IDAT"); |
| 1643 | png_crc_finish(png_ptr, length); |
| 1644 | return; |
| 1645 | } |
| 1646 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) |
| 1647 | { |
| 1648 | png_warning(png_ptr, "Duplicate oFFs chunk"); |
| 1649 | png_crc_finish(png_ptr, length); |
| 1650 | return; |
| 1651 | } |
| 1652 | |
| 1653 | if (length != 9) |
| 1654 | { |
| 1655 | png_warning(png_ptr, "Incorrect oFFs chunk length"); |
| 1656 | png_crc_finish(png_ptr, length); |
| 1657 | return; |
| 1658 | } |
| 1659 | |
| 1660 | png_crc_read(png_ptr, buf, 9); |
| 1661 | if (png_crc_finish(png_ptr, 0)) |
| 1662 | return; |
| 1663 | |
| 1664 | offset_x = png_get_int_32(buf); |
| 1665 | offset_y = png_get_int_32(buf + 4); |
| 1666 | unit_type = buf[8]; |
| 1667 | png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type); |
| 1668 | } |
| 1669 | #endif |
| 1670 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1671 | #ifdef PNG_READ_pCAL_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1672 | /* Read the pCAL chunk (described in the PNG Extensions document) */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1673 | void /* PRIVATE */ |
| 1674 | png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1675 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1676 | png_int_32 X0, X1; |
| 1677 | png_byte type, nparams; |
| 1678 | png_charp buf, units, endptr; |
| 1679 | png_charpp params; |
| 1680 | png_size_t slength; |
| 1681 | int i; |
| 1682 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1683 | png_debug(1, "in png_handle_pCAL"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1684 | |
| 1685 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1686 | png_error(png_ptr, "Missing IHDR before pCAL"); |
| 1687 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1688 | { |
| 1689 | png_warning(png_ptr, "Invalid pCAL after IDAT"); |
| 1690 | png_crc_finish(png_ptr, length); |
| 1691 | return; |
| 1692 | } |
| 1693 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) |
| 1694 | { |
| 1695 | png_warning(png_ptr, "Duplicate pCAL chunk"); |
| 1696 | png_crc_finish(png_ptr, length); |
| 1697 | return; |
| 1698 | } |
| 1699 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1700 | png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1701 | length + 1); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1702 | png_free(png_ptr, png_ptr->chunkdata); |
| 1703 | png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1704 | if (png_ptr->chunkdata == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1705 | { |
| 1706 | png_warning(png_ptr, "No memory for pCAL purpose."); |
| 1707 | return; |
| 1708 | } |
| 1709 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1710 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1711 | |
| 1712 | if (png_crc_finish(png_ptr, 0)) |
| 1713 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1714 | png_free(png_ptr, png_ptr->chunkdata); |
| 1715 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1716 | return; |
| 1717 | } |
| 1718 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1719 | png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1720 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1721 | png_debug(3, "Finding end of pCAL purpose string"); |
| 1722 | for (buf = png_ptr->chunkdata; *buf; buf++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1723 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1724 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1725 | endptr = png_ptr->chunkdata + slength; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1726 | |
| 1727 | /* We need to have at least 12 bytes after the purpose string |
| 1728 | in order to get the parameter information. */ |
| 1729 | if (endptr <= buf + 12) |
| 1730 | { |
| 1731 | png_warning(png_ptr, "Invalid pCAL data"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1732 | png_free(png_ptr, png_ptr->chunkdata); |
| 1733 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1734 | return; |
| 1735 | } |
| 1736 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1737 | png_debug(3, "Reading pCAL X0, X1, type, nparams, and units"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1738 | X0 = png_get_int_32((png_bytep)buf+1); |
| 1739 | X1 = png_get_int_32((png_bytep)buf+5); |
| 1740 | type = buf[9]; |
| 1741 | nparams = buf[10]; |
| 1742 | units = buf + 11; |
| 1743 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1744 | png_debug(3, "Checking pCAL equation type and number of parameters"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1745 | /* Check that we have the right number of parameters for known |
| 1746 | equation types. */ |
| 1747 | if ((type == PNG_EQUATION_LINEAR && nparams != 2) || |
| 1748 | (type == PNG_EQUATION_BASE_E && nparams != 3) || |
| 1749 | (type == PNG_EQUATION_ARBITRARY && nparams != 3) || |
| 1750 | (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) |
| 1751 | { |
| 1752 | png_warning(png_ptr, "Invalid pCAL parameters for equation type"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1753 | png_free(png_ptr, png_ptr->chunkdata); |
| 1754 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1755 | return; |
| 1756 | } |
| 1757 | else if (type >= PNG_EQUATION_LAST) |
| 1758 | { |
| 1759 | png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); |
| 1760 | } |
| 1761 | |
| 1762 | for (buf = units; *buf; buf++) |
| 1763 | /* Empty loop to move past the units string. */ ; |
| 1764 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1765 | png_debug(3, "Allocating pCAL parameters array"); |
| 1766 | params = (png_charpp)png_malloc_warn(png_ptr, |
| 1767 | (png_uint_32)(nparams * png_sizeof(png_charp))) ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1768 | if (params == NULL) |
| 1769 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1770 | png_free(png_ptr, png_ptr->chunkdata); |
| 1771 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1772 | png_warning(png_ptr, "No memory for pCAL params."); |
| 1773 | return; |
| 1774 | } |
| 1775 | |
| 1776 | /* Get pointers to the start of each parameter string. */ |
| 1777 | for (i = 0; i < (int)nparams; i++) |
| 1778 | { |
| 1779 | buf++; /* Skip the null string terminator from previous parameter. */ |
| 1780 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1781 | png_debug1(3, "Reading pCAL parameter %d", i); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1782 | for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++) |
| 1783 | /* Empty loop to move past each parameter string */ ; |
| 1784 | |
| 1785 | /* Make sure we haven't run out of data yet */ |
| 1786 | if (buf > endptr) |
| 1787 | { |
| 1788 | png_warning(png_ptr, "Invalid pCAL data"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1789 | png_free(png_ptr, png_ptr->chunkdata); |
| 1790 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1791 | png_free(png_ptr, params); |
| 1792 | return; |
| 1793 | } |
| 1794 | } |
| 1795 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1796 | png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams, |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1797 | units, params); |
| 1798 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1799 | png_free(png_ptr, png_ptr->chunkdata); |
| 1800 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1801 | png_free(png_ptr, params); |
| 1802 | } |
| 1803 | #endif |
| 1804 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1805 | #ifdef PNG_READ_sCAL_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1806 | /* Read the sCAL chunk */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1807 | void /* PRIVATE */ |
| 1808 | png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1809 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1810 | png_charp ep; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1811 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1812 | double width, height; |
| 1813 | png_charp vp; |
| 1814 | #else |
| 1815 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1816 | png_charp swidth, sheight; |
| 1817 | #endif |
| 1818 | #endif |
| 1819 | png_size_t slength; |
| 1820 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1821 | png_debug(1, "in png_handle_sCAL"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1822 | |
| 1823 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1824 | png_error(png_ptr, "Missing IHDR before sCAL"); |
| 1825 | else if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1826 | { |
| 1827 | png_warning(png_ptr, "Invalid sCAL after IDAT"); |
| 1828 | png_crc_finish(png_ptr, length); |
| 1829 | return; |
| 1830 | } |
| 1831 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) |
| 1832 | { |
| 1833 | png_warning(png_ptr, "Duplicate sCAL chunk"); |
| 1834 | png_crc_finish(png_ptr, length); |
| 1835 | return; |
| 1836 | } |
| 1837 | |
Eric Vannier | 66dce0d | 2011-07-20 17:03:29 -0700 | [diff] [blame] | 1838 | /* Need unit type, width, \0, height: minimum 4 bytes */ |
| 1839 | else if (length < 4) |
| 1840 | { |
| 1841 | png_warning(png_ptr, "sCAL chunk too short"); |
| 1842 | png_crc_finish(png_ptr, length); |
| 1843 | return; |
| 1844 | } |
| 1845 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1846 | png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)", |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1847 | length + 1); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1848 | png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 1849 | if (png_ptr->chunkdata == NULL) |
| 1850 | { |
| 1851 | png_warning(png_ptr, "Out of memory while processing sCAL chunk"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1852 | png_crc_finish(png_ptr, length); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1853 | return; |
| 1854 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1855 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1856 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1857 | |
| 1858 | if (png_crc_finish(png_ptr, 0)) |
| 1859 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1860 | png_free(png_ptr, png_ptr->chunkdata); |
| 1861 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1862 | return; |
| 1863 | } |
| 1864 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1865 | png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1866 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1867 | ep = png_ptr->chunkdata + 1; /* Skip unit byte */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1868 | |
| 1869 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1870 | width = png_strtod(png_ptr, ep, &vp); |
| 1871 | if (*vp) |
| 1872 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1873 | png_warning(png_ptr, "malformed width string in sCAL chunk"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1874 | png_free(png_ptr, png_ptr->chunkdata); |
| 1875 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1876 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1877 | } |
| 1878 | #else |
| 1879 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1880 | swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); |
| 1881 | if (swidth == NULL) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1882 | { |
| 1883 | png_warning(png_ptr, "Out of memory while processing sCAL chunk width"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1884 | png_free(png_ptr, png_ptr->chunkdata); |
| 1885 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1886 | return; |
| 1887 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1888 | png_memcpy(swidth, ep, (png_size_t)png_strlen(ep)); |
| 1889 | #endif |
| 1890 | #endif |
| 1891 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1892 | for (ep = png_ptr->chunkdata; *ep; ep++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1893 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1894 | ep++; |
| 1895 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1896 | if (png_ptr->chunkdata + slength < ep) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1897 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1898 | png_warning(png_ptr, "Truncated sCAL chunk"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1899 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1900 | png_free(png_ptr, swidth); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1901 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1902 | png_free(png_ptr, png_ptr->chunkdata); |
| 1903 | png_ptr->chunkdata = NULL; |
| 1904 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1905 | } |
| 1906 | |
| 1907 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1908 | height = png_strtod(png_ptr, ep, &vp); |
| 1909 | if (*vp) |
| 1910 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1911 | png_warning(png_ptr, "malformed height string in sCAL chunk"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1912 | png_free(png_ptr, png_ptr->chunkdata); |
| 1913 | png_ptr->chunkdata = NULL; |
| 1914 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1915 | png_free(png_ptr, swidth); |
| 1916 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1917 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1918 | } |
| 1919 | #else |
| 1920 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1921 | sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1); |
| 1922 | if (sheight == NULL) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1923 | { |
| 1924 | png_warning(png_ptr, "Out of memory while processing sCAL chunk height"); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1925 | png_free(png_ptr, png_ptr->chunkdata); |
| 1926 | png_ptr->chunkdata = NULL; |
| 1927 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1928 | png_free(png_ptr, swidth); |
| 1929 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1930 | return; |
| 1931 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1932 | png_memcpy(sheight, ep, (png_size_t)png_strlen(ep)); |
| 1933 | #endif |
| 1934 | #endif |
| 1935 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1936 | if (png_ptr->chunkdata + slength < ep |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1937 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1938 | || width <= 0. || height <= 0. |
| 1939 | #endif |
| 1940 | ) |
| 1941 | { |
| 1942 | png_warning(png_ptr, "Invalid sCAL data"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1943 | png_free(png_ptr, png_ptr->chunkdata); |
| 1944 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1945 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1946 | png_free(png_ptr, swidth); |
| 1947 | png_free(png_ptr, sheight); |
| 1948 | #endif |
| 1949 | return; |
| 1950 | } |
| 1951 | |
| 1952 | |
| 1953 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1954 | png_set_sCAL(png_ptr, info_ptr, png_ptr->chunkdata[0], width, height); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1955 | #else |
| 1956 | #ifdef PNG_FIXED_POINT_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1957 | png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], swidth, sheight); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1958 | #endif |
| 1959 | #endif |
| 1960 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1961 | png_free(png_ptr, png_ptr->chunkdata); |
| 1962 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1963 | #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) |
| 1964 | png_free(png_ptr, swidth); |
| 1965 | png_free(png_ptr, sheight); |
| 1966 | #endif |
| 1967 | } |
| 1968 | #endif |
| 1969 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1970 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1971 | void /* PRIVATE */ |
| 1972 | png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 1973 | { |
| 1974 | png_byte buf[7]; |
| 1975 | png_time mod_time; |
| 1976 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1977 | png_debug(1, "in png_handle_tIME"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1978 | |
| 1979 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 1980 | png_error(png_ptr, "Out of place tIME chunk"); |
| 1981 | else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) |
| 1982 | { |
| 1983 | png_warning(png_ptr, "Duplicate tIME chunk"); |
| 1984 | png_crc_finish(png_ptr, length); |
| 1985 | return; |
| 1986 | } |
| 1987 | |
| 1988 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 1989 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 1990 | |
| 1991 | if (length != 7) |
| 1992 | { |
| 1993 | png_warning(png_ptr, "Incorrect tIME chunk length"); |
| 1994 | png_crc_finish(png_ptr, length); |
| 1995 | return; |
| 1996 | } |
| 1997 | |
| 1998 | png_crc_read(png_ptr, buf, 7); |
| 1999 | if (png_crc_finish(png_ptr, 0)) |
| 2000 | return; |
| 2001 | |
| 2002 | mod_time.second = buf[6]; |
| 2003 | mod_time.minute = buf[5]; |
| 2004 | mod_time.hour = buf[4]; |
| 2005 | mod_time.day = buf[3]; |
| 2006 | mod_time.month = buf[2]; |
| 2007 | mod_time.year = png_get_uint_16(buf); |
| 2008 | |
| 2009 | png_set_tIME(png_ptr, info_ptr, &mod_time); |
| 2010 | } |
| 2011 | #endif |
| 2012 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2013 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2014 | /* Note: this does not properly handle chunks that are > 64K under DOS */ |
| 2015 | void /* PRIVATE */ |
| 2016 | png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2017 | { |
| 2018 | png_textp text_ptr; |
| 2019 | png_charp key; |
| 2020 | png_charp text; |
| 2021 | png_uint_32 skip = 0; |
| 2022 | png_size_t slength; |
| 2023 | int ret; |
| 2024 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2025 | png_debug(1, "in png_handle_tEXt"); |
| 2026 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2027 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 2028 | if (png_ptr->user_chunk_cache_max != 0) |
| 2029 | { |
| 2030 | if (png_ptr->user_chunk_cache_max == 1) |
| 2031 | { |
| 2032 | png_crc_finish(png_ptr, length); |
| 2033 | return; |
| 2034 | } |
| 2035 | if (--png_ptr->user_chunk_cache_max == 1) |
| 2036 | { |
| 2037 | png_warning(png_ptr, "No space in chunk cache for tEXt"); |
| 2038 | png_crc_finish(png_ptr, length); |
| 2039 | return; |
| 2040 | } |
| 2041 | } |
| 2042 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2043 | |
| 2044 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 2045 | png_error(png_ptr, "Missing IHDR before tEXt"); |
| 2046 | |
| 2047 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2048 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2049 | |
| 2050 | #ifdef PNG_MAX_MALLOC_64K |
| 2051 | if (length > (png_uint_32)65535L) |
| 2052 | { |
| 2053 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 2054 | skip = length - (png_uint_32)65535L; |
| 2055 | length = (png_uint_32)65535L; |
| 2056 | } |
| 2057 | #endif |
| 2058 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2059 | png_free(png_ptr, png_ptr->chunkdata); |
| 2060 | |
| 2061 | png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 2062 | if (png_ptr->chunkdata == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2063 | { |
| 2064 | png_warning(png_ptr, "No memory to process text chunk."); |
| 2065 | return; |
| 2066 | } |
| 2067 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2068 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2069 | |
| 2070 | if (png_crc_finish(png_ptr, skip)) |
| 2071 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2072 | png_free(png_ptr, png_ptr->chunkdata); |
| 2073 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2074 | return; |
| 2075 | } |
| 2076 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2077 | key = png_ptr->chunkdata; |
| 2078 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2079 | key[slength] = 0x00; |
| 2080 | |
| 2081 | for (text = key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2082 | /* Empty loop to find end of key */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2083 | |
| 2084 | if (text != key + slength) |
| 2085 | text++; |
| 2086 | |
| 2087 | text_ptr = (png_textp)png_malloc_warn(png_ptr, |
| 2088 | (png_uint_32)png_sizeof(png_text)); |
| 2089 | if (text_ptr == NULL) |
| 2090 | { |
| 2091 | png_warning(png_ptr, "Not enough memory to process text chunk."); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2092 | png_free(png_ptr, png_ptr->chunkdata); |
| 2093 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2094 | return; |
| 2095 | } |
| 2096 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 2097 | text_ptr->key = key; |
| 2098 | #ifdef PNG_iTXt_SUPPORTED |
| 2099 | text_ptr->lang = NULL; |
| 2100 | text_ptr->lang_key = NULL; |
| 2101 | text_ptr->itxt_length = 0; |
| 2102 | #endif |
| 2103 | text_ptr->text = text; |
| 2104 | text_ptr->text_length = png_strlen(text); |
| 2105 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2106 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2107 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2108 | png_free(png_ptr, png_ptr->chunkdata); |
| 2109 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2110 | png_free(png_ptr, text_ptr); |
| 2111 | if (ret) |
| 2112 | png_warning(png_ptr, "Insufficient memory to process text chunk."); |
| 2113 | } |
| 2114 | #endif |
| 2115 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2116 | #ifdef PNG_READ_zTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2117 | /* Note: this does not correctly handle chunks that are > 64K under DOS */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2118 | void /* PRIVATE */ |
| 2119 | png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2120 | { |
| 2121 | png_textp text_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2122 | png_charp text; |
| 2123 | int comp_type; |
| 2124 | int ret; |
| 2125 | png_size_t slength, prefix_len, data_len; |
| 2126 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2127 | png_debug(1, "in png_handle_zTXt"); |
| 2128 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2129 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 2130 | if (png_ptr->user_chunk_cache_max != 0) |
| 2131 | { |
| 2132 | if (png_ptr->user_chunk_cache_max == 1) |
| 2133 | { |
| 2134 | png_crc_finish(png_ptr, length); |
| 2135 | return; |
| 2136 | } |
| 2137 | if (--png_ptr->user_chunk_cache_max == 1) |
| 2138 | { |
| 2139 | png_warning(png_ptr, "No space in chunk cache for zTXt"); |
| 2140 | png_crc_finish(png_ptr, length); |
| 2141 | return; |
| 2142 | } |
| 2143 | } |
| 2144 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2145 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2146 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 2147 | png_error(png_ptr, "Missing IHDR before zTXt"); |
| 2148 | |
| 2149 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2150 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2151 | |
| 2152 | #ifdef PNG_MAX_MALLOC_64K |
| 2153 | /* We will no doubt have problems with chunks even half this size, but |
| 2154 | there is no hard and fast rule to tell us where to stop. */ |
| 2155 | if (length > (png_uint_32)65535L) |
| 2156 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2157 | png_warning(png_ptr, "zTXt chunk too large to fit in memory"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2158 | png_crc_finish(png_ptr, length); |
| 2159 | return; |
| 2160 | } |
| 2161 | #endif |
| 2162 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2163 | png_free(png_ptr, png_ptr->chunkdata); |
| 2164 | png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 2165 | if (png_ptr->chunkdata == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2166 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2167 | png_warning(png_ptr, "Out of memory processing zTXt chunk."); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2168 | return; |
| 2169 | } |
| 2170 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2171 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2172 | if (png_crc_finish(png_ptr, 0)) |
| 2173 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2174 | png_free(png_ptr, png_ptr->chunkdata); |
| 2175 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2176 | return; |
| 2177 | } |
| 2178 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2179 | png_ptr->chunkdata[slength] = 0x00; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2180 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2181 | for (text = png_ptr->chunkdata; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2182 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2183 | |
| 2184 | /* zTXt must have some text after the chunkdataword */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2185 | if (text >= png_ptr->chunkdata + slength - 2) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2186 | { |
| 2187 | png_warning(png_ptr, "Truncated zTXt chunk"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2188 | png_free(png_ptr, png_ptr->chunkdata); |
| 2189 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2190 | return; |
| 2191 | } |
| 2192 | else |
| 2193 | { |
| 2194 | comp_type = *(++text); |
| 2195 | if (comp_type != PNG_TEXT_COMPRESSION_zTXt) |
| 2196 | { |
| 2197 | png_warning(png_ptr, "Unknown compression type in zTXt chunk"); |
| 2198 | comp_type = PNG_TEXT_COMPRESSION_zTXt; |
| 2199 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2200 | text++; /* Skip the compression_method byte */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2201 | } |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2202 | prefix_len = text - png_ptr->chunkdata; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2203 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2204 | png_decompress_chunk(png_ptr, comp_type, |
| 2205 | (png_size_t)length, prefix_len, &data_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2206 | |
| 2207 | text_ptr = (png_textp)png_malloc_warn(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2208 | (png_uint_32)png_sizeof(png_text)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2209 | if (text_ptr == NULL) |
| 2210 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2211 | png_warning(png_ptr, "Not enough memory to process zTXt chunk."); |
| 2212 | png_free(png_ptr, png_ptr->chunkdata); |
| 2213 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2214 | return; |
| 2215 | } |
| 2216 | text_ptr->compression = comp_type; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2217 | text_ptr->key = png_ptr->chunkdata; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2218 | #ifdef PNG_iTXt_SUPPORTED |
| 2219 | text_ptr->lang = NULL; |
| 2220 | text_ptr->lang_key = NULL; |
| 2221 | text_ptr->itxt_length = 0; |
| 2222 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2223 | text_ptr->text = png_ptr->chunkdata + prefix_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2224 | text_ptr->text_length = data_len; |
| 2225 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2226 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2227 | |
| 2228 | png_free(png_ptr, text_ptr); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2229 | png_free(png_ptr, png_ptr->chunkdata); |
| 2230 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2231 | if (ret) |
| 2232 | png_error(png_ptr, "Insufficient memory to store zTXt chunk."); |
| 2233 | } |
| 2234 | #endif |
| 2235 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2236 | #ifdef PNG_READ_iTXt_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2237 | /* Note: this does not correctly handle chunks that are > 64K under DOS */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2238 | void /* PRIVATE */ |
| 2239 | png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2240 | { |
| 2241 | png_textp text_ptr; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2242 | png_charp key, lang, text, lang_key; |
| 2243 | int comp_flag; |
| 2244 | int comp_type = 0; |
| 2245 | int ret; |
| 2246 | png_size_t slength, prefix_len, data_len; |
| 2247 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2248 | png_debug(1, "in png_handle_iTXt"); |
| 2249 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2250 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 2251 | if (png_ptr->user_chunk_cache_max != 0) |
| 2252 | { |
| 2253 | if (png_ptr->user_chunk_cache_max == 1) |
| 2254 | { |
| 2255 | png_crc_finish(png_ptr, length); |
| 2256 | return; |
| 2257 | } |
| 2258 | if (--png_ptr->user_chunk_cache_max == 1) |
| 2259 | { |
| 2260 | png_warning(png_ptr, "No space in chunk cache for iTXt"); |
| 2261 | png_crc_finish(png_ptr, length); |
| 2262 | return; |
| 2263 | } |
| 2264 | } |
| 2265 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2266 | |
| 2267 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 2268 | png_error(png_ptr, "Missing IHDR before iTXt"); |
| 2269 | |
| 2270 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2271 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2272 | |
| 2273 | #ifdef PNG_MAX_MALLOC_64K |
| 2274 | /* We will no doubt have problems with chunks even half this size, but |
| 2275 | there is no hard and fast rule to tell us where to stop. */ |
| 2276 | if (length > (png_uint_32)65535L) |
| 2277 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2278 | png_warning(png_ptr, "iTXt chunk too large to fit in memory"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2279 | png_crc_finish(png_ptr, length); |
| 2280 | return; |
| 2281 | } |
| 2282 | #endif |
| 2283 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2284 | png_free(png_ptr, png_ptr->chunkdata); |
| 2285 | png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); |
| 2286 | if (png_ptr->chunkdata == NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2287 | { |
| 2288 | png_warning(png_ptr, "No memory to process iTXt chunk."); |
| 2289 | return; |
| 2290 | } |
| 2291 | slength = (png_size_t)length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2292 | png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2293 | if (png_crc_finish(png_ptr, 0)) |
| 2294 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2295 | png_free(png_ptr, png_ptr->chunkdata); |
| 2296 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2297 | return; |
| 2298 | } |
| 2299 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2300 | png_ptr->chunkdata[slength] = 0x00; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2301 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2302 | for (lang = png_ptr->chunkdata; *lang; lang++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2303 | /* Empty loop */ ; |
| 2304 | lang++; /* Skip NUL separator */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2305 | |
| 2306 | /* iTXt must have a language tag (possibly empty), two compression bytes, |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2307 | * translated keyword (possibly empty), and possibly some text after the |
| 2308 | * keyword |
| 2309 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2310 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2311 | if (lang >= png_ptr->chunkdata + slength - 3) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2312 | { |
| 2313 | png_warning(png_ptr, "Truncated iTXt chunk"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2314 | png_free(png_ptr, png_ptr->chunkdata); |
| 2315 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2316 | return; |
| 2317 | } |
| 2318 | else |
| 2319 | { |
| 2320 | comp_flag = *lang++; |
| 2321 | comp_type = *lang++; |
| 2322 | } |
| 2323 | |
| 2324 | for (lang_key = lang; *lang_key; lang_key++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2325 | /* Empty loop */ ; |
| 2326 | lang_key++; /* Skip NUL separator */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2327 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2328 | if (lang_key >= png_ptr->chunkdata + slength) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2329 | { |
| 2330 | png_warning(png_ptr, "Truncated iTXt chunk"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2331 | png_free(png_ptr, png_ptr->chunkdata); |
| 2332 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2333 | return; |
| 2334 | } |
| 2335 | |
| 2336 | for (text = lang_key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2337 | /* Empty loop */ ; |
| 2338 | text++; /* Skip NUL separator */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2339 | if (text >= png_ptr->chunkdata + slength) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2340 | { |
| 2341 | png_warning(png_ptr, "Malformed iTXt chunk"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2342 | png_free(png_ptr, png_ptr->chunkdata); |
| 2343 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2344 | return; |
| 2345 | } |
| 2346 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2347 | prefix_len = text - png_ptr->chunkdata; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2348 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2349 | key=png_ptr->chunkdata; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2350 | if (comp_flag) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2351 | png_decompress_chunk(png_ptr, comp_type, |
| 2352 | (size_t)length, prefix_len, &data_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2353 | else |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2354 | data_len = png_strlen(png_ptr->chunkdata + prefix_len); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2355 | text_ptr = (png_textp)png_malloc_warn(png_ptr, |
| 2356 | (png_uint_32)png_sizeof(png_text)); |
| 2357 | if (text_ptr == NULL) |
| 2358 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2359 | png_warning(png_ptr, "Not enough memory to process iTXt chunk."); |
| 2360 | png_free(png_ptr, png_ptr->chunkdata); |
| 2361 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2362 | return; |
| 2363 | } |
| 2364 | text_ptr->compression = (int)comp_flag + 1; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2365 | text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key); |
| 2366 | text_ptr->lang = png_ptr->chunkdata + (lang - key); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2367 | text_ptr->itxt_length = data_len; |
| 2368 | text_ptr->text_length = 0; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2369 | text_ptr->key = png_ptr->chunkdata; |
| 2370 | text_ptr->text = png_ptr->chunkdata + prefix_len; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2371 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2372 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2373 | |
| 2374 | png_free(png_ptr, text_ptr); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2375 | png_free(png_ptr, png_ptr->chunkdata); |
| 2376 | png_ptr->chunkdata = NULL; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2377 | if (ret) |
| 2378 | png_error(png_ptr, "Insufficient memory to store iTXt chunk."); |
| 2379 | } |
| 2380 | #endif |
| 2381 | |
| 2382 | /* This function is called when we haven't found a handler for a |
| 2383 | chunk. If there isn't a problem with the chunk itself (ie bad |
| 2384 | chunk name, CRC, or a critical chunk), the chunk is silently ignored |
| 2385 | -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which |
| 2386 | case it will be saved away to be written out later. */ |
| 2387 | void /* PRIVATE */ |
| 2388 | png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) |
| 2389 | { |
| 2390 | png_uint_32 skip = 0; |
| 2391 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2392 | png_debug(1, "in png_handle_unknown"); |
| 2393 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2394 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 2395 | if (png_ptr->user_chunk_cache_max != 0) |
| 2396 | { |
| 2397 | if (png_ptr->user_chunk_cache_max == 1) |
| 2398 | { |
| 2399 | png_crc_finish(png_ptr, length); |
| 2400 | return; |
| 2401 | } |
| 2402 | if (--png_ptr->user_chunk_cache_max == 1) |
| 2403 | { |
| 2404 | png_warning(png_ptr, "No space in chunk cache for unknown chunk"); |
| 2405 | png_crc_finish(png_ptr, length); |
| 2406 | return; |
| 2407 | } |
| 2408 | } |
| 2409 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2410 | |
| 2411 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 2412 | { |
| 2413 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 2414 | PNG_CONST PNG_IDAT; |
| 2415 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2416 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* Not an IDAT */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2417 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 2418 | } |
| 2419 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2420 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 2421 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2422 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2423 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2424 | PNG_HANDLE_CHUNK_ALWAYS |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2425 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2426 | && png_ptr->read_user_chunk_fn == NULL |
| 2427 | #endif |
| 2428 | ) |
| 2429 | #endif |
| 2430 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 2431 | } |
| 2432 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2433 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2434 | if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2435 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2436 | || (png_ptr->read_user_chunk_fn != NULL) |
| 2437 | #endif |
| 2438 | ) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2439 | { |
| 2440 | #ifdef PNG_MAX_MALLOC_64K |
| 2441 | if (length > (png_uint_32)65535L) |
| 2442 | { |
| 2443 | png_warning(png_ptr, "unknown chunk too large to fit in memory"); |
| 2444 | skip = length - (png_uint_32)65535L; |
| 2445 | length = (png_uint_32)65535L; |
| 2446 | } |
| 2447 | #endif |
| 2448 | png_memcpy((png_charp)png_ptr->unknown_chunk.name, |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2449 | (png_charp)png_ptr->chunk_name, |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2450 | png_sizeof(png_ptr->unknown_chunk.name)); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2451 | png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1] |
| 2452 | = '\0'; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2453 | png_ptr->unknown_chunk.size = (png_size_t)length; |
| 2454 | if (length == 0) |
| 2455 | png_ptr->unknown_chunk.data = NULL; |
| 2456 | else |
| 2457 | { |
| 2458 | png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length); |
| 2459 | png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); |
| 2460 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2461 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2462 | if (png_ptr->read_user_chunk_fn != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2463 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2464 | /* Callback to user unknown chunk handler */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2465 | int ret; |
| 2466 | ret = (*(png_ptr->read_user_chunk_fn)) |
| 2467 | (png_ptr, &png_ptr->unknown_chunk); |
| 2468 | if (ret < 0) |
| 2469 | png_chunk_error(png_ptr, "error in user chunk"); |
| 2470 | if (ret == 0) |
| 2471 | { |
| 2472 | if (!(png_ptr->chunk_name[0] & 0x20)) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2473 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2474 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2475 | PNG_HANDLE_CHUNK_ALWAYS) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2476 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2477 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 2478 | png_set_unknown_chunks(png_ptr, info_ptr, |
| 2479 | &png_ptr->unknown_chunk, 1); |
| 2480 | } |
| 2481 | } |
| 2482 | else |
| 2483 | #endif |
| 2484 | png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); |
| 2485 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 2486 | png_ptr->unknown_chunk.data = NULL; |
| 2487 | } |
| 2488 | else |
| 2489 | #endif |
| 2490 | skip = length; |
| 2491 | |
| 2492 | png_crc_finish(png_ptr, skip); |
| 2493 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2494 | #ifndef PNG_READ_USER_CHUNKS_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2495 | info_ptr = info_ptr; /* Quiet compiler warnings about unused info_ptr */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2496 | #endif |
| 2497 | } |
| 2498 | |
| 2499 | /* This function is called to verify that a chunk name is valid. |
| 2500 | This function can't have the "critical chunk check" incorporated |
| 2501 | into it, since in the future we will need to be able to call user |
| 2502 | functions to handle unknown critical chunks after we check that |
| 2503 | the chunk name itself is valid. */ |
| 2504 | |
| 2505 | #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
| 2506 | |
| 2507 | void /* PRIVATE */ |
| 2508 | png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name) |
| 2509 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2510 | png_debug(1, "in png_check_chunk_name"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2511 | if (isnonalpha(chunk_name[0]) || isnonalpha(chunk_name[1]) || |
| 2512 | isnonalpha(chunk_name[2]) || isnonalpha(chunk_name[3])) |
| 2513 | { |
| 2514 | png_chunk_error(png_ptr, "invalid chunk type"); |
| 2515 | } |
| 2516 | } |
| 2517 | |
| 2518 | /* Combines the row recently read in with the existing pixels in the |
| 2519 | row. This routine takes care of alpha and transparency if requested. |
| 2520 | This routine also handles the two methods of progressive display |
| 2521 | of interlaced images, depending on the mask value. |
| 2522 | The mask value describes which pixels are to be combined with |
| 2523 | the row. The pattern always repeats every 8 pixels, so just 8 |
| 2524 | bits are needed. A one indicates the pixel is to be combined, |
| 2525 | a zero indicates the pixel is to be skipped. This is in addition |
| 2526 | to any alpha or transparency value associated with the pixel. If |
| 2527 | you want all pixels to be combined, pass 0xff (255) in mask. */ |
| 2528 | |
| 2529 | void /* PRIVATE */ |
| 2530 | png_combine_row(png_structp png_ptr, png_bytep row, int mask) |
| 2531 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2532 | png_debug(1, "in png_combine_row"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2533 | if (mask == 0xff) |
| 2534 | { |
| 2535 | png_memcpy(row, png_ptr->row_buf + 1, |
| 2536 | PNG_ROWBYTES(png_ptr->row_info.pixel_depth, png_ptr->width)); |
| 2537 | } |
| 2538 | else |
| 2539 | { |
| 2540 | switch (png_ptr->row_info.pixel_depth) |
| 2541 | { |
| 2542 | case 1: |
| 2543 | { |
| 2544 | png_bytep sp = png_ptr->row_buf + 1; |
| 2545 | png_bytep dp = row; |
| 2546 | int s_inc, s_start, s_end; |
| 2547 | int m = 0x80; |
| 2548 | int shift; |
| 2549 | png_uint_32 i; |
| 2550 | png_uint_32 row_width = png_ptr->width; |
| 2551 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2552 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2553 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2554 | { |
| 2555 | s_start = 0; |
| 2556 | s_end = 7; |
| 2557 | s_inc = 1; |
| 2558 | } |
| 2559 | else |
| 2560 | #endif |
| 2561 | { |
| 2562 | s_start = 7; |
| 2563 | s_end = 0; |
| 2564 | s_inc = -1; |
| 2565 | } |
| 2566 | |
| 2567 | shift = s_start; |
| 2568 | |
| 2569 | for (i = 0; i < row_width; i++) |
| 2570 | { |
| 2571 | if (m & mask) |
| 2572 | { |
| 2573 | int value; |
| 2574 | |
| 2575 | value = (*sp >> shift) & 0x01; |
| 2576 | *dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); |
| 2577 | *dp |= (png_byte)(value << shift); |
| 2578 | } |
| 2579 | |
| 2580 | if (shift == s_end) |
| 2581 | { |
| 2582 | shift = s_start; |
| 2583 | sp++; |
| 2584 | dp++; |
| 2585 | } |
| 2586 | else |
| 2587 | shift += s_inc; |
| 2588 | |
| 2589 | if (m == 1) |
| 2590 | m = 0x80; |
| 2591 | else |
| 2592 | m >>= 1; |
| 2593 | } |
| 2594 | break; |
| 2595 | } |
| 2596 | case 2: |
| 2597 | { |
| 2598 | png_bytep sp = png_ptr->row_buf + 1; |
| 2599 | png_bytep dp = row; |
| 2600 | int s_start, s_end, s_inc; |
| 2601 | int m = 0x80; |
| 2602 | int shift; |
| 2603 | png_uint_32 i; |
| 2604 | png_uint_32 row_width = png_ptr->width; |
| 2605 | int value; |
| 2606 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2607 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2608 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2609 | { |
| 2610 | s_start = 0; |
| 2611 | s_end = 6; |
| 2612 | s_inc = 2; |
| 2613 | } |
| 2614 | else |
| 2615 | #endif |
| 2616 | { |
| 2617 | s_start = 6; |
| 2618 | s_end = 0; |
| 2619 | s_inc = -2; |
| 2620 | } |
| 2621 | |
| 2622 | shift = s_start; |
| 2623 | |
| 2624 | for (i = 0; i < row_width; i++) |
| 2625 | { |
| 2626 | if (m & mask) |
| 2627 | { |
| 2628 | value = (*sp >> shift) & 0x03; |
| 2629 | *dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); |
| 2630 | *dp |= (png_byte)(value << shift); |
| 2631 | } |
| 2632 | |
| 2633 | if (shift == s_end) |
| 2634 | { |
| 2635 | shift = s_start; |
| 2636 | sp++; |
| 2637 | dp++; |
| 2638 | } |
| 2639 | else |
| 2640 | shift += s_inc; |
| 2641 | if (m == 1) |
| 2642 | m = 0x80; |
| 2643 | else |
| 2644 | m >>= 1; |
| 2645 | } |
| 2646 | break; |
| 2647 | } |
| 2648 | case 4: |
| 2649 | { |
| 2650 | png_bytep sp = png_ptr->row_buf + 1; |
| 2651 | png_bytep dp = row; |
| 2652 | int s_start, s_end, s_inc; |
| 2653 | int m = 0x80; |
| 2654 | int shift; |
| 2655 | png_uint_32 i; |
| 2656 | png_uint_32 row_width = png_ptr->width; |
| 2657 | int value; |
| 2658 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2659 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2660 | if (png_ptr->transformations & PNG_PACKSWAP) |
| 2661 | { |
| 2662 | s_start = 0; |
| 2663 | s_end = 4; |
| 2664 | s_inc = 4; |
| 2665 | } |
| 2666 | else |
| 2667 | #endif |
| 2668 | { |
| 2669 | s_start = 4; |
| 2670 | s_end = 0; |
| 2671 | s_inc = -4; |
| 2672 | } |
| 2673 | shift = s_start; |
| 2674 | |
| 2675 | for (i = 0; i < row_width; i++) |
| 2676 | { |
| 2677 | if (m & mask) |
| 2678 | { |
| 2679 | value = (*sp >> shift) & 0xf; |
| 2680 | *dp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); |
| 2681 | *dp |= (png_byte)(value << shift); |
| 2682 | } |
| 2683 | |
| 2684 | if (shift == s_end) |
| 2685 | { |
| 2686 | shift = s_start; |
| 2687 | sp++; |
| 2688 | dp++; |
| 2689 | } |
| 2690 | else |
| 2691 | shift += s_inc; |
| 2692 | if (m == 1) |
| 2693 | m = 0x80; |
| 2694 | else |
| 2695 | m >>= 1; |
| 2696 | } |
| 2697 | break; |
| 2698 | } |
| 2699 | default: |
| 2700 | { |
| 2701 | png_bytep sp = png_ptr->row_buf + 1; |
| 2702 | png_bytep dp = row; |
| 2703 | png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3); |
| 2704 | png_uint_32 i; |
| 2705 | png_uint_32 row_width = png_ptr->width; |
| 2706 | png_byte m = 0x80; |
| 2707 | |
| 2708 | |
| 2709 | for (i = 0; i < row_width; i++) |
| 2710 | { |
| 2711 | if (m & mask) |
| 2712 | { |
| 2713 | png_memcpy(dp, sp, pixel_bytes); |
| 2714 | } |
| 2715 | |
| 2716 | sp += pixel_bytes; |
| 2717 | dp += pixel_bytes; |
| 2718 | |
| 2719 | if (m == 1) |
| 2720 | m = 0x80; |
| 2721 | else |
| 2722 | m >>= 1; |
| 2723 | } |
| 2724 | break; |
| 2725 | } |
| 2726 | } |
| 2727 | } |
| 2728 | } |
| 2729 | |
| 2730 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 2731 | /* OLD pre-1.0.9 interface: |
| 2732 | void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, |
| 2733 | png_uint_32 transformations) |
| 2734 | */ |
| 2735 | void /* PRIVATE */ |
| 2736 | png_do_read_interlace(png_structp png_ptr) |
| 2737 | { |
| 2738 | png_row_infop row_info = &(png_ptr->row_info); |
| 2739 | png_bytep row = png_ptr->row_buf + 1; |
| 2740 | int pass = png_ptr->pass; |
| 2741 | png_uint_32 transformations = png_ptr->transformations; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2742 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 2743 | /* Offset to next interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2744 | PNG_CONST int 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] | 2745 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2746 | png_debug(1, "in png_do_read_interlace"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2747 | if (row != NULL && row_info != NULL) |
| 2748 | { |
| 2749 | png_uint_32 final_width; |
| 2750 | |
| 2751 | final_width = row_info->width * png_pass_inc[pass]; |
| 2752 | |
| 2753 | switch (row_info->pixel_depth) |
| 2754 | { |
| 2755 | case 1: |
| 2756 | { |
| 2757 | png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3); |
| 2758 | png_bytep dp = row + (png_size_t)((final_width - 1) >> 3); |
| 2759 | int sshift, dshift; |
| 2760 | int s_start, s_end, s_inc; |
| 2761 | int jstop = png_pass_inc[pass]; |
| 2762 | png_byte v; |
| 2763 | png_uint_32 i; |
| 2764 | int j; |
| 2765 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2766 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2767 | if (transformations & PNG_PACKSWAP) |
| 2768 | { |
| 2769 | sshift = (int)((row_info->width + 7) & 0x07); |
| 2770 | dshift = (int)((final_width + 7) & 0x07); |
| 2771 | s_start = 7; |
| 2772 | s_end = 0; |
| 2773 | s_inc = -1; |
| 2774 | } |
| 2775 | else |
| 2776 | #endif |
| 2777 | { |
| 2778 | sshift = 7 - (int)((row_info->width + 7) & 0x07); |
| 2779 | dshift = 7 - (int)((final_width + 7) & 0x07); |
| 2780 | s_start = 0; |
| 2781 | s_end = 7; |
| 2782 | s_inc = 1; |
| 2783 | } |
| 2784 | |
| 2785 | for (i = 0; i < row_info->width; i++) |
| 2786 | { |
| 2787 | v = (png_byte)((*sp >> sshift) & 0x01); |
| 2788 | for (j = 0; j < jstop; j++) |
| 2789 | { |
| 2790 | *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); |
| 2791 | *dp |= (png_byte)(v << dshift); |
| 2792 | if (dshift == s_end) |
| 2793 | { |
| 2794 | dshift = s_start; |
| 2795 | dp--; |
| 2796 | } |
| 2797 | else |
| 2798 | dshift += s_inc; |
| 2799 | } |
| 2800 | if (sshift == s_end) |
| 2801 | { |
| 2802 | sshift = s_start; |
| 2803 | sp--; |
| 2804 | } |
| 2805 | else |
| 2806 | sshift += s_inc; |
| 2807 | } |
| 2808 | break; |
| 2809 | } |
| 2810 | case 2: |
| 2811 | { |
| 2812 | png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2); |
| 2813 | png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2); |
| 2814 | int sshift, dshift; |
| 2815 | int s_start, s_end, s_inc; |
| 2816 | int jstop = png_pass_inc[pass]; |
| 2817 | png_uint_32 i; |
| 2818 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2819 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2820 | if (transformations & PNG_PACKSWAP) |
| 2821 | { |
| 2822 | sshift = (int)(((row_info->width + 3) & 0x03) << 1); |
| 2823 | dshift = (int)(((final_width + 3) & 0x03) << 1); |
| 2824 | s_start = 6; |
| 2825 | s_end = 0; |
| 2826 | s_inc = -2; |
| 2827 | } |
| 2828 | else |
| 2829 | #endif |
| 2830 | { |
| 2831 | sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1); |
| 2832 | dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1); |
| 2833 | s_start = 0; |
| 2834 | s_end = 6; |
| 2835 | s_inc = 2; |
| 2836 | } |
| 2837 | |
| 2838 | for (i = 0; i < row_info->width; i++) |
| 2839 | { |
| 2840 | png_byte v; |
| 2841 | int j; |
| 2842 | |
| 2843 | v = (png_byte)((*sp >> sshift) & 0x03); |
| 2844 | for (j = 0; j < jstop; j++) |
| 2845 | { |
| 2846 | *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); |
| 2847 | *dp |= (png_byte)(v << dshift); |
| 2848 | if (dshift == s_end) |
| 2849 | { |
| 2850 | dshift = s_start; |
| 2851 | dp--; |
| 2852 | } |
| 2853 | else |
| 2854 | dshift += s_inc; |
| 2855 | } |
| 2856 | if (sshift == s_end) |
| 2857 | { |
| 2858 | sshift = s_start; |
| 2859 | sp--; |
| 2860 | } |
| 2861 | else |
| 2862 | sshift += s_inc; |
| 2863 | } |
| 2864 | break; |
| 2865 | } |
| 2866 | case 4: |
| 2867 | { |
| 2868 | png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1); |
| 2869 | png_bytep dp = row + (png_size_t)((final_width - 1) >> 1); |
| 2870 | int sshift, dshift; |
| 2871 | int s_start, s_end, s_inc; |
| 2872 | png_uint_32 i; |
| 2873 | int jstop = png_pass_inc[pass]; |
| 2874 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2875 | #ifdef PNG_READ_PACKSWAP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2876 | if (transformations & PNG_PACKSWAP) |
| 2877 | { |
| 2878 | sshift = (int)(((row_info->width + 1) & 0x01) << 2); |
| 2879 | dshift = (int)(((final_width + 1) & 0x01) << 2); |
| 2880 | s_start = 4; |
| 2881 | s_end = 0; |
| 2882 | s_inc = -4; |
| 2883 | } |
| 2884 | else |
| 2885 | #endif |
| 2886 | { |
| 2887 | sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2); |
| 2888 | dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2); |
| 2889 | s_start = 0; |
| 2890 | s_end = 4; |
| 2891 | s_inc = 4; |
| 2892 | } |
| 2893 | |
| 2894 | for (i = 0; i < row_info->width; i++) |
| 2895 | { |
| 2896 | png_byte v = (png_byte)((*sp >> sshift) & 0xf); |
| 2897 | int j; |
| 2898 | |
| 2899 | for (j = 0; j < jstop; j++) |
| 2900 | { |
| 2901 | *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff); |
| 2902 | *dp |= (png_byte)(v << dshift); |
| 2903 | if (dshift == s_end) |
| 2904 | { |
| 2905 | dshift = s_start; |
| 2906 | dp--; |
| 2907 | } |
| 2908 | else |
| 2909 | dshift += s_inc; |
| 2910 | } |
| 2911 | if (sshift == s_end) |
| 2912 | { |
| 2913 | sshift = s_start; |
| 2914 | sp--; |
| 2915 | } |
| 2916 | else |
| 2917 | sshift += s_inc; |
| 2918 | } |
| 2919 | break; |
| 2920 | } |
| 2921 | default: |
| 2922 | { |
| 2923 | png_size_t pixel_bytes = (row_info->pixel_depth >> 3); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2924 | png_bytep sp = row + (png_size_t)(row_info->width - 1) |
| 2925 | * pixel_bytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2926 | png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes; |
| 2927 | |
| 2928 | int jstop = png_pass_inc[pass]; |
| 2929 | png_uint_32 i; |
| 2930 | |
| 2931 | for (i = 0; i < row_info->width; i++) |
| 2932 | { |
| 2933 | png_byte v[8]; |
| 2934 | int j; |
| 2935 | |
| 2936 | png_memcpy(v, sp, pixel_bytes); |
| 2937 | for (j = 0; j < jstop; j++) |
| 2938 | { |
| 2939 | png_memcpy(dp, v, pixel_bytes); |
| 2940 | dp -= pixel_bytes; |
| 2941 | } |
| 2942 | sp -= pixel_bytes; |
| 2943 | } |
| 2944 | break; |
| 2945 | } |
| 2946 | } |
| 2947 | row_info->width = final_width; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2948 | row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, final_width); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2949 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 2950 | #ifndef PNG_READ_PACKSWAP_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 2951 | transformations = transformations; /* Silence compiler warning */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2952 | #endif |
| 2953 | } |
| 2954 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| 2955 | |
| 2956 | void /* PRIVATE */ |
| 2957 | png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row, |
| 2958 | png_bytep prev_row, int filter) |
| 2959 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 2960 | png_debug(1, "in png_read_filter_row"); |
| 2961 | png_debug2(2, "row = %lu, filter = %d", png_ptr->row_number, filter); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 2962 | switch (filter) |
| 2963 | { |
| 2964 | case PNG_FILTER_VALUE_NONE: |
| 2965 | break; |
| 2966 | case PNG_FILTER_VALUE_SUB: |
| 2967 | { |
| 2968 | png_uint_32 i; |
| 2969 | png_uint_32 istop = row_info->rowbytes; |
| 2970 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 2971 | png_bytep rp = row + bpp; |
| 2972 | png_bytep lp = row; |
| 2973 | |
| 2974 | for (i = bpp; i < istop; i++) |
| 2975 | { |
| 2976 | *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff); |
| 2977 | rp++; |
| 2978 | } |
| 2979 | break; |
| 2980 | } |
| 2981 | case PNG_FILTER_VALUE_UP: |
| 2982 | { |
| 2983 | png_uint_32 i; |
| 2984 | png_uint_32 istop = row_info->rowbytes; |
| 2985 | png_bytep rp = row; |
| 2986 | png_bytep pp = prev_row; |
| 2987 | |
| 2988 | for (i = 0; i < istop; i++) |
| 2989 | { |
| 2990 | *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); |
| 2991 | rp++; |
| 2992 | } |
| 2993 | break; |
| 2994 | } |
| 2995 | case PNG_FILTER_VALUE_AVG: |
| 2996 | { |
| 2997 | png_uint_32 i; |
| 2998 | png_bytep rp = row; |
| 2999 | png_bytep pp = prev_row; |
| 3000 | png_bytep lp = row; |
| 3001 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 3002 | png_uint_32 istop = row_info->rowbytes - bpp; |
| 3003 | |
| 3004 | for (i = 0; i < bpp; i++) |
| 3005 | { |
| 3006 | *rp = (png_byte)(((int)(*rp) + |
| 3007 | ((int)(*pp++) / 2 )) & 0xff); |
| 3008 | rp++; |
| 3009 | } |
| 3010 | |
| 3011 | for (i = 0; i < istop; i++) |
| 3012 | { |
| 3013 | *rp = (png_byte)(((int)(*rp) + |
| 3014 | (int)(*pp++ + *lp++) / 2 ) & 0xff); |
| 3015 | rp++; |
| 3016 | } |
| 3017 | break; |
| 3018 | } |
| 3019 | case PNG_FILTER_VALUE_PAETH: |
| 3020 | { |
| 3021 | png_uint_32 i; |
| 3022 | png_bytep rp = row; |
| 3023 | png_bytep pp = prev_row; |
| 3024 | png_bytep lp = row; |
| 3025 | png_bytep cp = prev_row; |
| 3026 | png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3; |
| 3027 | png_uint_32 istop=row_info->rowbytes - bpp; |
| 3028 | |
| 3029 | for (i = 0; i < bpp; i++) |
| 3030 | { |
| 3031 | *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff); |
| 3032 | rp++; |
| 3033 | } |
| 3034 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3035 | for (i = 0; i < istop; i++) /* Use leftover rp,pp */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3036 | { |
| 3037 | int a, b, c, pa, pb, pc, p; |
| 3038 | |
| 3039 | a = *lp++; |
| 3040 | b = *pp++; |
| 3041 | c = *cp++; |
| 3042 | |
| 3043 | p = b - c; |
| 3044 | pc = a - c; |
| 3045 | |
| 3046 | #ifdef PNG_USE_ABS |
| 3047 | pa = abs(p); |
| 3048 | pb = abs(pc); |
| 3049 | pc = abs(p + pc); |
| 3050 | #else |
| 3051 | pa = p < 0 ? -p : p; |
| 3052 | pb = pc < 0 ? -pc : pc; |
| 3053 | pc = (p + pc) < 0 ? -(p + pc) : p + pc; |
| 3054 | #endif |
| 3055 | |
| 3056 | /* |
| 3057 | if (pa <= pb && pa <= pc) |
| 3058 | p = a; |
| 3059 | else if (pb <= pc) |
| 3060 | p = b; |
| 3061 | else |
| 3062 | p = c; |
| 3063 | */ |
| 3064 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3065 | p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3066 | |
| 3067 | *rp = (png_byte)(((int)(*rp) + p) & 0xff); |
| 3068 | rp++; |
| 3069 | } |
| 3070 | break; |
| 3071 | } |
| 3072 | default: |
| 3073 | png_warning(png_ptr, "Ignoring bad adaptive filter type"); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3074 | *row = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3075 | break; |
| 3076 | } |
| 3077 | } |
| 3078 | |
Joseph Wen | 4ce0ee1 | 2010-08-20 10:42:22 +0800 | [diff] [blame] | 3079 | #ifdef PNG_INDEX_SUPPORTED |
| 3080 | void /* PRIVATE */ |
| 3081 | png_set_interlaced_pass(png_structp png_ptr, int pass) |
| 3082 | { |
| 3083 | /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ |
| 3084 | |
| 3085 | /* Start of interlace block */ |
| 3086 | PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
| 3087 | |
| 3088 | /* Offset to next interlace block */ |
| 3089 | PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 3090 | |
| 3091 | /* Start of interlace block in the y direction */ |
| 3092 | PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
| 3093 | |
| 3094 | /* Offset to next interlace block in the y direction */ |
| 3095 | PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
| 3096 | |
| 3097 | png_ptr->pass = pass; |
| 3098 | png_ptr->iwidth = (png_ptr->width + |
| 3099 | png_pass_inc[png_ptr->pass] - 1 - |
| 3100 | png_pass_start[png_ptr->pass]) / |
| 3101 | png_pass_inc[png_ptr->pass]; |
| 3102 | } |
| 3103 | #endif |
| 3104 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3105 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3106 | void /* PRIVATE */ |
| 3107 | png_read_finish_row(png_structp png_ptr) |
| 3108 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3109 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3110 | /* 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] | 3111 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3112 | /* Start of interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3113 | PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
| 3114 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3115 | /* Offset to next interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3116 | PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 3117 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3118 | /* Start of interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3119 | PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
| 3120 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3121 | /* Offset to next interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3122 | PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
| 3123 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3124 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3125 | png_debug(1, "in png_read_finish_row"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3126 | png_ptr->row_number++; |
| 3127 | if (png_ptr->row_number < png_ptr->num_rows) |
| 3128 | return; |
| 3129 | |
| 3130 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 3131 | if (png_ptr->interlaced) |
| 3132 | { |
| 3133 | png_ptr->row_number = 0; |
| 3134 | png_memset_check(png_ptr, png_ptr->prev_row, 0, |
| 3135 | png_ptr->rowbytes + 1); |
| 3136 | do |
| 3137 | { |
| 3138 | png_ptr->pass++; |
| 3139 | if (png_ptr->pass >= 7) |
| 3140 | break; |
| 3141 | png_ptr->iwidth = (png_ptr->width + |
| 3142 | png_pass_inc[png_ptr->pass] - 1 - |
| 3143 | png_pass_start[png_ptr->pass]) / |
| 3144 | png_pass_inc[png_ptr->pass]; |
| 3145 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3146 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 3147 | { |
| 3148 | png_ptr->num_rows = (png_ptr->height + |
| 3149 | png_pass_yinc[png_ptr->pass] - 1 - |
| 3150 | png_pass_ystart[png_ptr->pass]) / |
| 3151 | png_pass_yinc[png_ptr->pass]; |
| 3152 | if (!(png_ptr->num_rows)) |
| 3153 | continue; |
| 3154 | } |
| 3155 | else /* if (png_ptr->transformations & PNG_INTERLACE) */ |
| 3156 | break; |
| 3157 | } while (png_ptr->iwidth == 0); |
| 3158 | |
| 3159 | if (png_ptr->pass < 7) |
| 3160 | return; |
| 3161 | } |
| 3162 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| 3163 | |
| 3164 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 3165 | { |
| 3166 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 3167 | PNG_CONST PNG_IDAT; |
| 3168 | #endif |
| 3169 | char extra; |
| 3170 | int ret; |
| 3171 | |
| 3172 | png_ptr->zstream.next_out = (Byte *)&extra; |
| 3173 | png_ptr->zstream.avail_out = (uInt)1; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3174 | for (;;) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3175 | { |
| 3176 | if (!(png_ptr->zstream.avail_in)) |
| 3177 | { |
| 3178 | while (!png_ptr->idat_size) |
| 3179 | { |
| 3180 | png_byte chunk_length[4]; |
| 3181 | |
| 3182 | png_crc_finish(png_ptr, 0); |
| 3183 | |
| 3184 | png_read_data(png_ptr, chunk_length, 4); |
| 3185 | png_ptr->idat_size = png_get_uint_31(png_ptr, chunk_length); |
| 3186 | png_reset_crc(png_ptr); |
| 3187 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 3188 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 3189 | png_error(png_ptr, "Not enough image data"); |
| 3190 | |
| 3191 | } |
| 3192 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; |
| 3193 | png_ptr->zstream.next_in = png_ptr->zbuf; |
| 3194 | if (png_ptr->zbuf_size > png_ptr->idat_size) |
| 3195 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; |
| 3196 | png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in); |
| 3197 | png_ptr->idat_size -= png_ptr->zstream.avail_in; |
| 3198 | } |
| 3199 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 3200 | if (ret == Z_STREAM_END) |
| 3201 | { |
| 3202 | if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in || |
| 3203 | png_ptr->idat_size) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3204 | png_warning(png_ptr, "Extra compressed data."); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3205 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 3206 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 3207 | break; |
| 3208 | } |
| 3209 | if (ret != Z_OK) |
| 3210 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : |
| 3211 | "Decompression Error"); |
| 3212 | |
| 3213 | if (!(png_ptr->zstream.avail_out)) |
| 3214 | { |
| 3215 | png_warning(png_ptr, "Extra compressed data."); |
| 3216 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 3217 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 3218 | break; |
| 3219 | } |
| 3220 | |
| 3221 | } |
| 3222 | png_ptr->zstream.avail_out = 0; |
| 3223 | } |
| 3224 | |
| 3225 | if (png_ptr->idat_size || png_ptr->zstream.avail_in) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3226 | png_warning(png_ptr, "Extra compression data."); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3227 | |
| 3228 | inflateReset(&png_ptr->zstream); |
| 3229 | |
| 3230 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 3231 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3232 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3233 | |
| 3234 | void /* PRIVATE */ |
| 3235 | png_read_start_row(png_structp png_ptr) |
| 3236 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3237 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3238 | /* 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] | 3239 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3240 | /* Start of interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3241 | PNG_CONST int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; |
| 3242 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3243 | /* Offset to next interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3244 | PNG_CONST int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; |
| 3245 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3246 | /* Start of interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3247 | PNG_CONST int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; |
| 3248 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3249 | /* Offset to next interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3250 | PNG_CONST int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; |
| 3251 | #endif |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3252 | |
| 3253 | int max_pixel_depth; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3254 | png_size_t row_bytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3255 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3256 | png_debug(1, "in png_read_start_row"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3257 | png_ptr->zstream.avail_in = 0; |
| 3258 | png_init_read_transformations(png_ptr); |
| 3259 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| 3260 | if (png_ptr->interlaced) |
| 3261 | { |
| 3262 | if (!(png_ptr->transformations & PNG_INTERLACE)) |
| 3263 | png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - |
| 3264 | png_pass_ystart[0]) / png_pass_yinc[0]; |
| 3265 | else |
| 3266 | png_ptr->num_rows = png_ptr->height; |
| 3267 | |
| 3268 | png_ptr->iwidth = (png_ptr->width + |
| 3269 | png_pass_inc[png_ptr->pass] - 1 - |
| 3270 | png_pass_start[png_ptr->pass]) / |
| 3271 | png_pass_inc[png_ptr->pass]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3272 | } |
| 3273 | else |
| 3274 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| 3275 | { |
| 3276 | png_ptr->num_rows = png_ptr->height; |
| 3277 | png_ptr->iwidth = png_ptr->width; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3278 | } |
| 3279 | max_pixel_depth = png_ptr->pixel_depth; |
| 3280 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3281 | #ifdef PNG_READ_PACK_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3282 | if ((png_ptr->transformations & PNG_PACK) && png_ptr->bit_depth < 8) |
| 3283 | max_pixel_depth = 8; |
| 3284 | #endif |
| 3285 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3286 | #ifdef PNG_READ_EXPAND_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3287 | if (png_ptr->transformations & PNG_EXPAND) |
| 3288 | { |
| 3289 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 3290 | { |
| 3291 | if (png_ptr->num_trans) |
| 3292 | max_pixel_depth = 32; |
| 3293 | else |
| 3294 | max_pixel_depth = 24; |
| 3295 | } |
| 3296 | else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 3297 | { |
| 3298 | if (max_pixel_depth < 8) |
| 3299 | max_pixel_depth = 8; |
| 3300 | if (png_ptr->num_trans) |
| 3301 | max_pixel_depth *= 2; |
| 3302 | } |
| 3303 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 3304 | { |
| 3305 | if (png_ptr->num_trans) |
| 3306 | { |
| 3307 | max_pixel_depth *= 4; |
| 3308 | max_pixel_depth /= 3; |
| 3309 | } |
| 3310 | } |
| 3311 | } |
| 3312 | #endif |
| 3313 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3314 | #ifdef PNG_READ_FILLER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3315 | if (png_ptr->transformations & (PNG_FILLER)) |
| 3316 | { |
| 3317 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 3318 | max_pixel_depth = 32; |
| 3319 | else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) |
| 3320 | { |
| 3321 | if (max_pixel_depth <= 8) |
| 3322 | max_pixel_depth = 16; |
| 3323 | else |
| 3324 | max_pixel_depth = 32; |
| 3325 | } |
| 3326 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) |
| 3327 | { |
| 3328 | if (max_pixel_depth <= 32) |
| 3329 | max_pixel_depth = 32; |
| 3330 | else |
| 3331 | max_pixel_depth = 64; |
| 3332 | } |
| 3333 | } |
| 3334 | #endif |
| 3335 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3336 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3337 | if (png_ptr->transformations & PNG_GRAY_TO_RGB) |
| 3338 | { |
| 3339 | if ( |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3340 | #ifdef PNG_READ_EXPAND_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3341 | (png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) || |
| 3342 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3343 | #ifdef PNG_READ_FILLER_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3344 | (png_ptr->transformations & (PNG_FILLER)) || |
| 3345 | #endif |
| 3346 | png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) |
| 3347 | { |
| 3348 | if (max_pixel_depth <= 16) |
| 3349 | max_pixel_depth = 32; |
| 3350 | else |
| 3351 | max_pixel_depth = 64; |
| 3352 | } |
| 3353 | else |
| 3354 | { |
| 3355 | if (max_pixel_depth <= 8) |
| 3356 | { |
| 3357 | if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 3358 | max_pixel_depth = 32; |
| 3359 | else |
| 3360 | max_pixel_depth = 24; |
| 3361 | } |
| 3362 | else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
| 3363 | max_pixel_depth = 64; |
| 3364 | else |
| 3365 | max_pixel_depth = 48; |
| 3366 | } |
| 3367 | } |
| 3368 | #endif |
| 3369 | |
| 3370 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \ |
| 3371 | defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3372 | if (png_ptr->transformations & PNG_USER_TRANSFORM) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3373 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3374 | int user_pixel_depth = png_ptr->user_transform_depth* |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3375 | png_ptr->user_transform_channels; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3376 | if (user_pixel_depth > max_pixel_depth) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3377 | max_pixel_depth=user_pixel_depth; |
| 3378 | } |
| 3379 | #endif |
| 3380 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3381 | /* Align the width on the next larger 8 pixels. Mainly used |
| 3382 | * for interlacing |
| 3383 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3384 | row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3385 | /* Calculate the maximum bytes needed, adding a byte and a pixel |
| 3386 | * for safety's sake |
| 3387 | */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3388 | row_bytes = PNG_ROWBYTES(max_pixel_depth, row_bytes) + |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3389 | 1 + ((max_pixel_depth + 7) >> 3); |
| 3390 | #ifdef PNG_MAX_MALLOC_64K |
| 3391 | if (row_bytes > (png_uint_32)65536L) |
| 3392 | png_error(png_ptr, "This image requires a row greater than 64KB"); |
| 3393 | #endif |
| 3394 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3395 | if (row_bytes + 64 > png_ptr->old_big_row_buf_size) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3396 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3397 | png_free(png_ptr, png_ptr->big_row_buf); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3398 | if (png_ptr->interlaced) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3399 | png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr, |
| 3400 | row_bytes + 64); |
| 3401 | else |
| 3402 | png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, |
| 3403 | row_bytes + 64); |
| 3404 | png_ptr->old_big_row_buf_size = row_bytes + 64; |
| 3405 | |
| 3406 | /* Use 32 bytes of padding before and after row_buf. */ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3407 | png_ptr->row_buf = png_ptr->big_row_buf + 32; |
| 3408 | png_ptr->old_big_row_buf_size = row_bytes + 64; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3409 | } |
| 3410 | |
| 3411 | #ifdef PNG_MAX_MALLOC_64K |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3412 | if ((png_uint_32)row_bytes + 1 > (png_uint_32)65536L) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3413 | png_error(png_ptr, "This image requires a row greater than 64KB"); |
| 3414 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3415 | if ((png_uint_32)row_bytes > (png_uint_32)(PNG_SIZE_MAX - 1)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3416 | png_error(png_ptr, "Row has too many bytes to allocate in memory."); |
| 3417 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3418 | if (row_bytes + 1 > png_ptr->old_prev_row_size) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3419 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3420 | png_free(png_ptr, png_ptr->prev_row); |
| 3421 | png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, (png_uint_32)( |
| 3422 | row_bytes + 1)); |
| 3423 | png_memset_check(png_ptr, png_ptr->prev_row, 0, row_bytes + 1); |
| 3424 | png_ptr->old_prev_row_size = row_bytes + 1; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3425 | } |
| 3426 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 3427 | png_ptr->rowbytes = row_bytes; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3428 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 3429 | png_debug1(3, "width = %lu,", png_ptr->width); |
| 3430 | png_debug1(3, "height = %lu,", png_ptr->height); |
| 3431 | png_debug1(3, "iwidth = %lu,", png_ptr->iwidth); |
| 3432 | png_debug1(3, "num_rows = %lu,", png_ptr->num_rows); |
| 3433 | png_debug1(3, "rowbytes = %lu,", png_ptr->rowbytes); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 3434 | png_debug1(3, "irowbytes = %lu", |
| 3435 | PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 3436 | |
| 3437 | png_ptr->flags |= PNG_FLAG_ROW_INIT; |
| 3438 | } |
| 3439 | #endif /* PNG_READ_SUPPORTED */ |