The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | |
| 2 | /* pngpread.c - read a png file in push mode |
| 3 | * |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 4 | * Last changed in libpng 1.2.37 [July 16, 2009] |
| 5 | * Copyright (c) 1998-2009 Glenn Randers-Pehrson |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 8 | * |
| 9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 12 | */ |
| 13 | |
| 14 | #define PNG_INTERNAL |
| 15 | #include "png.h" |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 16 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 17 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 18 | /* Push model modes */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 19 | #define PNG_READ_SIG_MODE 0 |
| 20 | #define PNG_READ_CHUNK_MODE 1 |
| 21 | #define PNG_READ_IDAT_MODE 2 |
| 22 | #define PNG_SKIP_MODE 3 |
| 23 | #define PNG_READ_tEXt_MODE 4 |
| 24 | #define PNG_READ_zTXt_MODE 5 |
| 25 | #define PNG_READ_DONE_MODE 6 |
| 26 | #define PNG_READ_iTXt_MODE 7 |
| 27 | #define PNG_ERROR_MODE 8 |
| 28 | |
| 29 | void PNGAPI |
| 30 | png_process_data(png_structp png_ptr, png_infop info_ptr, |
| 31 | png_bytep buffer, png_size_t buffer_size) |
| 32 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 33 | if (png_ptr == NULL || info_ptr == NULL) |
| 34 | return; |
| 35 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 36 | png_push_restore_buffer(png_ptr, buffer, buffer_size); |
| 37 | |
| 38 | while (png_ptr->buffer_size) |
| 39 | { |
| 40 | png_process_some_data(png_ptr, info_ptr); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | /* What we do with the incoming data depends on what we were previously |
| 45 | * doing before we ran out of data... |
| 46 | */ |
| 47 | void /* PRIVATE */ |
| 48 | png_process_some_data(png_structp png_ptr, png_infop info_ptr) |
| 49 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 50 | if (png_ptr == NULL) |
| 51 | return; |
| 52 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 53 | switch (png_ptr->process_mode) |
| 54 | { |
| 55 | case PNG_READ_SIG_MODE: |
| 56 | { |
| 57 | png_push_read_sig(png_ptr, info_ptr); |
| 58 | break; |
| 59 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 60 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 61 | case PNG_READ_CHUNK_MODE: |
| 62 | { |
| 63 | png_push_read_chunk(png_ptr, info_ptr); |
| 64 | break; |
| 65 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 66 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 67 | case PNG_READ_IDAT_MODE: |
| 68 | { |
| 69 | png_push_read_IDAT(png_ptr); |
| 70 | break; |
| 71 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 72 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 73 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 74 | case PNG_READ_tEXt_MODE: |
| 75 | { |
| 76 | png_push_read_tEXt(png_ptr, info_ptr); |
| 77 | break; |
| 78 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 79 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 80 | #endif |
| 81 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 82 | case PNG_READ_zTXt_MODE: |
| 83 | { |
| 84 | png_push_read_zTXt(png_ptr, info_ptr); |
| 85 | break; |
| 86 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 87 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 88 | #endif |
| 89 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 90 | case PNG_READ_iTXt_MODE: |
| 91 | { |
| 92 | png_push_read_iTXt(png_ptr, info_ptr); |
| 93 | break; |
| 94 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 95 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 96 | #endif |
| 97 | case PNG_SKIP_MODE: |
| 98 | { |
| 99 | png_push_crc_finish(png_ptr); |
| 100 | break; |
| 101 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 102 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 103 | default: |
| 104 | { |
| 105 | png_ptr->buffer_size = 0; |
| 106 | break; |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* Read any remaining signature bytes from the stream and compare them with |
| 112 | * the correct PNG signature. It is possible that this routine is called |
| 113 | * with bytes already read from the signature, either because they have been |
| 114 | * checked by the calling application, or because of multiple calls to this |
| 115 | * routine. |
| 116 | */ |
| 117 | void /* PRIVATE */ |
| 118 | png_push_read_sig(png_structp png_ptr, png_infop info_ptr) |
| 119 | { |
| 120 | png_size_t num_checked = png_ptr->sig_bytes, |
| 121 | num_to_check = 8 - num_checked; |
| 122 | |
| 123 | if (png_ptr->buffer_size < num_to_check) |
| 124 | { |
| 125 | num_to_check = png_ptr->buffer_size; |
| 126 | } |
| 127 | |
| 128 | png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), |
| 129 | num_to_check); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 130 | png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes + num_to_check); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 131 | |
| 132 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 133 | { |
| 134 | if (num_checked < 4 && |
| 135 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 136 | png_error(png_ptr, "Not a PNG file"); |
| 137 | else |
| 138 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 139 | } |
| 140 | else |
| 141 | { |
| 142 | if (png_ptr->sig_bytes >= 8) |
| 143 | { |
| 144 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 145 | } |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | void /* PRIVATE */ |
| 150 | png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) |
| 151 | { |
| 152 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 153 | PNG_CONST PNG_IHDR; |
| 154 | PNG_CONST PNG_IDAT; |
| 155 | PNG_CONST PNG_IEND; |
| 156 | PNG_CONST PNG_PLTE; |
| 157 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 158 | PNG_CONST PNG_bKGD; |
| 159 | #endif |
| 160 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 161 | PNG_CONST PNG_cHRM; |
| 162 | #endif |
| 163 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 164 | PNG_CONST PNG_gAMA; |
| 165 | #endif |
| 166 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 167 | PNG_CONST PNG_hIST; |
| 168 | #endif |
| 169 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 170 | PNG_CONST PNG_iCCP; |
| 171 | #endif |
| 172 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 173 | PNG_CONST PNG_iTXt; |
| 174 | #endif |
| 175 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 176 | PNG_CONST PNG_oFFs; |
| 177 | #endif |
| 178 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 179 | PNG_CONST PNG_pCAL; |
| 180 | #endif |
| 181 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 182 | PNG_CONST PNG_pHYs; |
| 183 | #endif |
| 184 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 185 | PNG_CONST PNG_sBIT; |
| 186 | #endif |
| 187 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| 188 | PNG_CONST PNG_sCAL; |
| 189 | #endif |
| 190 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 191 | PNG_CONST PNG_sRGB; |
| 192 | #endif |
| 193 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 194 | PNG_CONST PNG_sPLT; |
| 195 | #endif |
| 196 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 197 | PNG_CONST PNG_tEXt; |
| 198 | #endif |
| 199 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 200 | PNG_CONST PNG_tIME; |
| 201 | #endif |
| 202 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 203 | PNG_CONST PNG_tRNS; |
| 204 | #endif |
| 205 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 206 | PNG_CONST PNG_zTXt; |
| 207 | #endif |
| 208 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
| 209 | /* First we make sure we have enough data for the 4 byte chunk name |
| 210 | * and the 4 byte chunk length before proceeding with decoding the |
| 211 | * chunk data. To fully decode each of these chunks, we also make |
| 212 | * sure we have enough data in the buffer for the 4 byte CRC at the |
| 213 | * end of every chunk (except IDAT, which is handled separately). |
| 214 | */ |
| 215 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 216 | { |
| 217 | png_byte chunk_length[4]; |
| 218 | |
| 219 | if (png_ptr->buffer_size < 8) |
| 220 | { |
| 221 | png_push_save_buffer(png_ptr); |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 226 | png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 227 | png_reset_crc(png_ptr); |
| 228 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 229 | png_check_chunk_name(png_ptr, png_ptr->chunk_name); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 230 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 231 | } |
| 232 | |
| 233 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 234 | if (png_ptr->mode & PNG_AFTER_IDAT) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 235 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 236 | |
| 237 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| 238 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 239 | if (png_ptr->push_length != 13) |
| 240 | png_error(png_ptr, "Invalid IHDR length"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 241 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 242 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 243 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 244 | png_push_save_buffer(png_ptr); |
| 245 | return; |
| 246 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 247 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 248 | png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); |
| 249 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 250 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 251 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| 252 | { |
| 253 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 254 | { |
| 255 | png_push_save_buffer(png_ptr); |
| 256 | return; |
| 257 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 258 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 259 | png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); |
| 260 | |
| 261 | png_ptr->process_mode = PNG_READ_DONE_MODE; |
| 262 | png_push_have_end(png_ptr, info_ptr); |
| 263 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 264 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 265 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 266 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
| 267 | { |
| 268 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 269 | { |
| 270 | png_push_save_buffer(png_ptr); |
| 271 | return; |
| 272 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 273 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 274 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 275 | png_ptr->mode |= PNG_HAVE_IDAT; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 276 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 277 | png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 278 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 279 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 280 | png_ptr->mode |= PNG_HAVE_PLTE; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 281 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 282 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 283 | { |
| 284 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 285 | png_error(png_ptr, "Missing IHDR before IDAT"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 286 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 287 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 288 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 289 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 290 | } |
| 291 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 292 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 293 | #endif |
| 294 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 295 | { |
| 296 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 297 | { |
| 298 | png_push_save_buffer(png_ptr); |
| 299 | return; |
| 300 | } |
| 301 | png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); |
| 302 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 303 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 304 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 305 | { |
| 306 | /* If we reach an IDAT chunk, this means we have read all of the |
| 307 | * header chunks, and we can start reading the image (or if this |
| 308 | * is called after the image has been read - we have an error). |
| 309 | */ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 310 | |
| 311 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 312 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 313 | |
| 314 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 315 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 316 | png_error(png_ptr, "Missing PLTE before IDAT"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 317 | |
| 318 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 319 | { |
| 320 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 321 | if (png_ptr->push_length == 0) |
| 322 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 323 | |
| 324 | if (png_ptr->mode & PNG_AFTER_IDAT) |
| 325 | png_error(png_ptr, "Too many IDAT's found"); |
| 326 | } |
| 327 | |
| 328 | png_ptr->idat_size = png_ptr->push_length; |
| 329 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 330 | png_ptr->process_mode = PNG_READ_IDAT_MODE; |
| 331 | png_push_have_info(png_ptr, info_ptr); |
| 332 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 333 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 334 | return; |
| 335 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 336 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 337 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 338 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| 339 | { |
| 340 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 341 | { |
| 342 | png_push_save_buffer(png_ptr); |
| 343 | return; |
| 344 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 345 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 346 | png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); |
| 347 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 348 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 349 | #endif |
| 350 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 351 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| 352 | { |
| 353 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 354 | { |
| 355 | png_push_save_buffer(png_ptr); |
| 356 | return; |
| 357 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 358 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 359 | png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); |
| 360 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 361 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 362 | #endif |
| 363 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 364 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| 365 | { |
| 366 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 367 | { |
| 368 | png_push_save_buffer(png_ptr); |
| 369 | return; |
| 370 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 371 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 372 | png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); |
| 373 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 374 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 375 | #endif |
| 376 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 377 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| 378 | { |
| 379 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 380 | { |
| 381 | png_push_save_buffer(png_ptr); |
| 382 | return; |
| 383 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 384 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 385 | png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); |
| 386 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 387 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 388 | #endif |
| 389 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 390 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
| 391 | { |
| 392 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 393 | { |
| 394 | png_push_save_buffer(png_ptr); |
| 395 | return; |
| 396 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 397 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 398 | png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length); |
| 399 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 400 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 401 | #endif |
| 402 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 403 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
| 404 | { |
| 405 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 406 | { |
| 407 | png_push_save_buffer(png_ptr); |
| 408 | return; |
| 409 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 410 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 411 | png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length); |
| 412 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 413 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 414 | #endif |
| 415 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 416 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| 417 | { |
| 418 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 419 | { |
| 420 | png_push_save_buffer(png_ptr); |
| 421 | return; |
| 422 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 423 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 424 | png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); |
| 425 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 426 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 427 | #endif |
| 428 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 429 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| 430 | { |
| 431 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 432 | { |
| 433 | png_push_save_buffer(png_ptr); |
| 434 | return; |
| 435 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 436 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 437 | png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); |
| 438 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 439 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 440 | #endif |
| 441 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 442 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| 443 | { |
| 444 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 445 | { |
| 446 | png_push_save_buffer(png_ptr); |
| 447 | return; |
| 448 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 449 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 450 | png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); |
| 451 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 452 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 453 | #endif |
| 454 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 455 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| 456 | { |
| 457 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 458 | { |
| 459 | png_push_save_buffer(png_ptr); |
| 460 | return; |
| 461 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 462 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 463 | png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); |
| 464 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 465 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 466 | #endif |
| 467 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 468 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| 469 | { |
| 470 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 471 | { |
| 472 | png_push_save_buffer(png_ptr); |
| 473 | return; |
| 474 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 475 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 476 | png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); |
| 477 | } |
| 478 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 479 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 480 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 481 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| 482 | { |
| 483 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 484 | { |
| 485 | png_push_save_buffer(png_ptr); |
| 486 | return; |
| 487 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 488 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 489 | png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 490 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 491 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 492 | #endif |
| 493 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| 494 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
| 495 | { |
| 496 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 497 | { |
| 498 | png_push_save_buffer(png_ptr); |
| 499 | return; |
| 500 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 501 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 502 | png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 503 | } |
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 | #endif |
| 506 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 507 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| 508 | { |
| 509 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 510 | { |
| 511 | png_push_save_buffer(png_ptr); |
| 512 | return; |
| 513 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 514 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 515 | png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); |
| 516 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 517 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 518 | #endif |
| 519 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 520 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| 521 | { |
| 522 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 523 | { |
| 524 | png_push_save_buffer(png_ptr); |
| 525 | return; |
| 526 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 527 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 528 | png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); |
| 529 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 530 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 531 | #endif |
| 532 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 533 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| 534 | { |
| 535 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 536 | { |
| 537 | png_push_save_buffer(png_ptr); |
| 538 | return; |
| 539 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 540 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 541 | png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 542 | } |
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 | #endif |
| 545 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 546 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
| 547 | { |
| 548 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 549 | { |
| 550 | png_push_save_buffer(png_ptr); |
| 551 | return; |
| 552 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 553 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 554 | png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 555 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 556 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 557 | #endif |
| 558 | else |
| 559 | { |
| 560 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 561 | { |
| 562 | png_push_save_buffer(png_ptr); |
| 563 | return; |
| 564 | } |
| 565 | png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
| 566 | } |
| 567 | |
| 568 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 569 | } |
| 570 | |
| 571 | void /* PRIVATE */ |
| 572 | png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) |
| 573 | { |
| 574 | png_ptr->process_mode = PNG_SKIP_MODE; |
| 575 | png_ptr->skip_length = skip; |
| 576 | } |
| 577 | |
| 578 | void /* PRIVATE */ |
| 579 | png_push_crc_finish(png_structp png_ptr) |
| 580 | { |
| 581 | if (png_ptr->skip_length && png_ptr->save_buffer_size) |
| 582 | { |
| 583 | png_size_t save_size; |
| 584 | |
| 585 | if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) |
| 586 | save_size = (png_size_t)png_ptr->skip_length; |
| 587 | else |
| 588 | save_size = png_ptr->save_buffer_size; |
| 589 | |
| 590 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 591 | |
| 592 | png_ptr->skip_length -= save_size; |
| 593 | png_ptr->buffer_size -= save_size; |
| 594 | png_ptr->save_buffer_size -= save_size; |
| 595 | png_ptr->save_buffer_ptr += save_size; |
| 596 | } |
| 597 | if (png_ptr->skip_length && png_ptr->current_buffer_size) |
| 598 | { |
| 599 | png_size_t save_size; |
| 600 | |
| 601 | if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) |
| 602 | save_size = (png_size_t)png_ptr->skip_length; |
| 603 | else |
| 604 | save_size = png_ptr->current_buffer_size; |
| 605 | |
| 606 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 607 | |
| 608 | png_ptr->skip_length -= save_size; |
| 609 | png_ptr->buffer_size -= save_size; |
| 610 | png_ptr->current_buffer_size -= save_size; |
| 611 | png_ptr->current_buffer_ptr += save_size; |
| 612 | } |
| 613 | if (!png_ptr->skip_length) |
| 614 | { |
| 615 | if (png_ptr->buffer_size < 4) |
| 616 | { |
| 617 | png_push_save_buffer(png_ptr); |
| 618 | return; |
| 619 | } |
| 620 | |
| 621 | png_crc_finish(png_ptr, 0); |
| 622 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | void PNGAPI |
| 627 | png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) |
| 628 | { |
| 629 | png_bytep ptr; |
| 630 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 631 | if (png_ptr == NULL) |
| 632 | return; |
| 633 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 634 | ptr = buffer; |
| 635 | if (png_ptr->save_buffer_size) |
| 636 | { |
| 637 | png_size_t save_size; |
| 638 | |
| 639 | if (length < png_ptr->save_buffer_size) |
| 640 | save_size = length; |
| 641 | else |
| 642 | save_size = png_ptr->save_buffer_size; |
| 643 | |
| 644 | png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); |
| 645 | length -= save_size; |
| 646 | ptr += save_size; |
| 647 | png_ptr->buffer_size -= save_size; |
| 648 | png_ptr->save_buffer_size -= save_size; |
| 649 | png_ptr->save_buffer_ptr += save_size; |
| 650 | } |
| 651 | if (length && png_ptr->current_buffer_size) |
| 652 | { |
| 653 | png_size_t save_size; |
| 654 | |
| 655 | if (length < png_ptr->current_buffer_size) |
| 656 | save_size = length; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 657 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 658 | else |
| 659 | save_size = png_ptr->current_buffer_size; |
| 660 | |
| 661 | png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); |
| 662 | png_ptr->buffer_size -= save_size; |
| 663 | png_ptr->current_buffer_size -= save_size; |
| 664 | png_ptr->current_buffer_ptr += save_size; |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | void /* PRIVATE */ |
| 669 | png_push_save_buffer(png_structp png_ptr) |
| 670 | { |
| 671 | if (png_ptr->save_buffer_size) |
| 672 | { |
| 673 | if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) |
| 674 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 675 | png_size_t i, istop; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 676 | png_bytep sp; |
| 677 | png_bytep dp; |
| 678 | |
| 679 | istop = png_ptr->save_buffer_size; |
| 680 | for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; |
| 681 | i < istop; i++, sp++, dp++) |
| 682 | { |
| 683 | *dp = *sp; |
| 684 | } |
| 685 | } |
| 686 | } |
| 687 | if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > |
| 688 | png_ptr->save_buffer_max) |
| 689 | { |
| 690 | png_size_t new_max; |
| 691 | png_bytep old_buffer; |
| 692 | |
| 693 | if (png_ptr->save_buffer_size > PNG_SIZE_MAX - |
| 694 | (png_ptr->current_buffer_size + 256)) |
| 695 | { |
| 696 | png_error(png_ptr, "Potential overflow of save_buffer"); |
| 697 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 698 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 699 | new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; |
| 700 | old_buffer = png_ptr->save_buffer; |
| 701 | png_ptr->save_buffer = (png_bytep)png_malloc(png_ptr, |
| 702 | (png_uint_32)new_max); |
| 703 | png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); |
| 704 | png_free(png_ptr, old_buffer); |
| 705 | png_ptr->save_buffer_max = new_max; |
| 706 | } |
| 707 | if (png_ptr->current_buffer_size) |
| 708 | { |
| 709 | png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, |
| 710 | png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); |
| 711 | png_ptr->save_buffer_size += png_ptr->current_buffer_size; |
| 712 | png_ptr->current_buffer_size = 0; |
| 713 | } |
| 714 | png_ptr->save_buffer_ptr = png_ptr->save_buffer; |
| 715 | png_ptr->buffer_size = 0; |
| 716 | } |
| 717 | |
| 718 | void /* PRIVATE */ |
| 719 | png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, |
| 720 | png_size_t buffer_length) |
| 721 | { |
| 722 | png_ptr->current_buffer = buffer; |
| 723 | png_ptr->current_buffer_size = buffer_length; |
| 724 | png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; |
| 725 | png_ptr->current_buffer_ptr = png_ptr->current_buffer; |
| 726 | } |
| 727 | |
| 728 | void /* PRIVATE */ |
| 729 | png_push_read_IDAT(png_structp png_ptr) |
| 730 | { |
| 731 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 732 | PNG_CONST PNG_IDAT; |
| 733 | #endif |
| 734 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 735 | { |
| 736 | png_byte chunk_length[4]; |
| 737 | |
| 738 | if (png_ptr->buffer_size < 8) |
| 739 | { |
| 740 | png_push_save_buffer(png_ptr); |
| 741 | return; |
| 742 | } |
| 743 | |
| 744 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 745 | png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 746 | png_reset_crc(png_ptr); |
| 747 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 748 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 749 | |
| 750 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 751 | { |
| 752 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 753 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 754 | png_error(png_ptr, "Not enough compressed data"); |
| 755 | return; |
| 756 | } |
| 757 | |
| 758 | png_ptr->idat_size = png_ptr->push_length; |
| 759 | } |
| 760 | if (png_ptr->idat_size && png_ptr->save_buffer_size) |
| 761 | { |
| 762 | png_size_t save_size; |
| 763 | |
| 764 | if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) |
| 765 | { |
| 766 | save_size = (png_size_t)png_ptr->idat_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 767 | |
| 768 | /* Check for overflow */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 769 | if ((png_uint_32)save_size != png_ptr->idat_size) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 770 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 771 | } |
| 772 | else |
| 773 | save_size = png_ptr->save_buffer_size; |
| 774 | |
| 775 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 776 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 777 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 778 | png_process_IDAT_data(png_ptr, png_ptr->save_buffer_ptr, save_size); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 779 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 780 | png_ptr->idat_size -= save_size; |
| 781 | png_ptr->buffer_size -= save_size; |
| 782 | png_ptr->save_buffer_size -= save_size; |
| 783 | png_ptr->save_buffer_ptr += save_size; |
| 784 | } |
| 785 | if (png_ptr->idat_size && png_ptr->current_buffer_size) |
| 786 | { |
| 787 | png_size_t save_size; |
| 788 | |
| 789 | if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) |
| 790 | { |
| 791 | save_size = (png_size_t)png_ptr->idat_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 792 | |
| 793 | /* Check for overflow */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 794 | if ((png_uint_32)save_size != png_ptr->idat_size) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 795 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 796 | } |
| 797 | else |
| 798 | save_size = png_ptr->current_buffer_size; |
| 799 | |
| 800 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 801 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 802 | png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 803 | |
| 804 | png_ptr->idat_size -= save_size; |
| 805 | png_ptr->buffer_size -= save_size; |
| 806 | png_ptr->current_buffer_size -= save_size; |
| 807 | png_ptr->current_buffer_ptr += save_size; |
| 808 | } |
| 809 | if (!png_ptr->idat_size) |
| 810 | { |
| 811 | if (png_ptr->buffer_size < 4) |
| 812 | { |
| 813 | png_push_save_buffer(png_ptr); |
| 814 | return; |
| 815 | } |
| 816 | |
| 817 | png_crc_finish(png_ptr, 0); |
| 818 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 819 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 820 | } |
| 821 | } |
| 822 | |
| 823 | void /* PRIVATE */ |
| 824 | png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, |
| 825 | png_size_t buffer_length) |
| 826 | { |
| 827 | int ret; |
| 828 | |
| 829 | if ((png_ptr->flags & PNG_FLAG_ZLIB_FINISHED) && buffer_length) |
| 830 | png_error(png_ptr, "Extra compression data"); |
| 831 | |
| 832 | png_ptr->zstream.next_in = buffer; |
| 833 | png_ptr->zstream.avail_in = (uInt)buffer_length; |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 834 | for (;;) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 835 | { |
| 836 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 837 | if (ret != Z_OK) |
| 838 | { |
| 839 | if (ret == Z_STREAM_END) |
| 840 | { |
| 841 | if (png_ptr->zstream.avail_in) |
| 842 | png_error(png_ptr, "Extra compressed data"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 843 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 844 | if (!(png_ptr->zstream.avail_out)) |
| 845 | { |
| 846 | png_push_process_row(png_ptr); |
| 847 | } |
| 848 | |
| 849 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 850 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 851 | break; |
| 852 | } |
| 853 | else if (ret == Z_BUF_ERROR) |
| 854 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 855 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 856 | else |
| 857 | png_error(png_ptr, "Decompression Error"); |
| 858 | } |
| 859 | if (!(png_ptr->zstream.avail_out)) |
| 860 | { |
| 861 | if (( |
| 862 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 863 | png_ptr->interlaced && png_ptr->pass > 6) || |
| 864 | (!png_ptr->interlaced && |
| 865 | #endif |
| 866 | png_ptr->row_number == png_ptr->num_rows)) |
| 867 | { |
| 868 | if (png_ptr->zstream.avail_in) |
| 869 | png_warning(png_ptr, "Too much data in IDAT chunks"); |
| 870 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 871 | break; |
| 872 | } |
| 873 | png_push_process_row(png_ptr); |
| 874 | png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes; |
| 875 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 876 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 877 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 878 | else |
| 879 | break; |
| 880 | } |
| 881 | } |
| 882 | |
| 883 | void /* PRIVATE */ |
| 884 | png_push_process_row(png_structp png_ptr) |
| 885 | { |
| 886 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 887 | png_ptr->row_info.width = png_ptr->iwidth; |
| 888 | png_ptr->row_info.channels = png_ptr->channels; |
| 889 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 890 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 891 | |
| 892 | png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 893 | png_ptr->row_info.width); |
| 894 | |
| 895 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
| 896 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 897 | (int)(png_ptr->row_buf[0])); |
| 898 | |
| 899 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 900 | png_ptr->rowbytes + 1); |
| 901 | |
| 902 | if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
| 903 | png_do_read_transformations(png_ptr); |
| 904 | |
| 905 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 906 | /* Blow up interlaced rows to full size */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 907 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 908 | { |
| 909 | if (png_ptr->pass < 6) |
| 910 | /* old interface (pre-1.0.9): |
| 911 | png_do_read_interlace(&(png_ptr->row_info), |
| 912 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
| 913 | */ |
| 914 | png_do_read_interlace(png_ptr); |
| 915 | |
| 916 | switch (png_ptr->pass) |
| 917 | { |
| 918 | case 0: |
| 919 | { |
| 920 | int i; |
| 921 | for (i = 0; i < 8 && png_ptr->pass == 0; i++) |
| 922 | { |
| 923 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 924 | png_read_push_finish_row(png_ptr); /* Updates png_ptr->pass */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 925 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 926 | |
| 927 | if (png_ptr->pass == 2) /* Pass 1 might be empty */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 928 | { |
| 929 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 930 | { |
| 931 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 932 | png_read_push_finish_row(png_ptr); |
| 933 | } |
| 934 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 935 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 936 | if (png_ptr->pass == 4 && png_ptr->height <= 4) |
| 937 | { |
| 938 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 939 | { |
| 940 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 941 | png_read_push_finish_row(png_ptr); |
| 942 | } |
| 943 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 944 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 945 | if (png_ptr->pass == 6 && png_ptr->height <= 4) |
| 946 | { |
| 947 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 948 | png_read_push_finish_row(png_ptr); |
| 949 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 950 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 951 | break; |
| 952 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 953 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 954 | case 1: |
| 955 | { |
| 956 | int i; |
| 957 | for (i = 0; i < 8 && png_ptr->pass == 1; i++) |
| 958 | { |
| 959 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 960 | png_read_push_finish_row(png_ptr); |
| 961 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 962 | |
| 963 | if (png_ptr->pass == 2) /* Skip top 4 generated rows */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 964 | { |
| 965 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 966 | { |
| 967 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 968 | png_read_push_finish_row(png_ptr); |
| 969 | } |
| 970 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 971 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 972 | break; |
| 973 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 974 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 975 | case 2: |
| 976 | { |
| 977 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 978 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 979 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 980 | { |
| 981 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 982 | png_read_push_finish_row(png_ptr); |
| 983 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 984 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 985 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 986 | { |
| 987 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 988 | png_read_push_finish_row(png_ptr); |
| 989 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 990 | |
| 991 | if (png_ptr->pass == 4) /* Pass 3 might be empty */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 992 | { |
| 993 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 994 | { |
| 995 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 996 | png_read_push_finish_row(png_ptr); |
| 997 | } |
| 998 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 999 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1000 | break; |
| 1001 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1002 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1003 | case 3: |
| 1004 | { |
| 1005 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1006 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1007 | for (i = 0; i < 4 && png_ptr->pass == 3; i++) |
| 1008 | { |
| 1009 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1010 | png_read_push_finish_row(png_ptr); |
| 1011 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1012 | |
| 1013 | if (png_ptr->pass == 4) /* Skip top two generated rows */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1014 | { |
| 1015 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1016 | { |
| 1017 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1018 | png_read_push_finish_row(png_ptr); |
| 1019 | } |
| 1020 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1021 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1022 | break; |
| 1023 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1024 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1025 | case 4: |
| 1026 | { |
| 1027 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1028 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1029 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1030 | { |
| 1031 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1032 | png_read_push_finish_row(png_ptr); |
| 1033 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1034 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1035 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1036 | { |
| 1037 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1038 | png_read_push_finish_row(png_ptr); |
| 1039 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1040 | |
| 1041 | if (png_ptr->pass == 6) /* Pass 5 might be empty */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1042 | { |
| 1043 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1044 | png_read_push_finish_row(png_ptr); |
| 1045 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1046 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1047 | break; |
| 1048 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1049 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1050 | case 5: |
| 1051 | { |
| 1052 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1053 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1054 | for (i = 0; i < 2 && png_ptr->pass == 5; i++) |
| 1055 | { |
| 1056 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1057 | png_read_push_finish_row(png_ptr); |
| 1058 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1059 | |
| 1060 | if (png_ptr->pass == 6) /* Skip top generated row */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1061 | { |
| 1062 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1063 | png_read_push_finish_row(png_ptr); |
| 1064 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1065 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1066 | break; |
| 1067 | } |
| 1068 | case 6: |
| 1069 | { |
| 1070 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1071 | png_read_push_finish_row(png_ptr); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1072 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1073 | if (png_ptr->pass != 6) |
| 1074 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1075 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1076 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1077 | png_read_push_finish_row(png_ptr); |
| 1078 | } |
| 1079 | } |
| 1080 | } |
| 1081 | else |
| 1082 | #endif |
| 1083 | { |
| 1084 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1085 | png_read_push_finish_row(png_ptr); |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | void /* PRIVATE */ |
| 1090 | png_read_push_finish_row(png_structp png_ptr) |
| 1091 | { |
| 1092 | #ifdef PNG_USE_LOCAL_ARRAYS |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1093 | /* 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] | 1094 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1095 | /* Start of interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1096 | PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
| 1097 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1098 | /* Offset to next interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1099 | PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1100 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1101 | /* Start of interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1102 | PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
| 1103 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1104 | /* Offset to next interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1105 | PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
| 1106 | |
| 1107 | /* Height of interlace block. This is not currently used - if you need |
| 1108 | * it, uncomment it here and in png.h |
| 1109 | PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1110 | */ |
| 1111 | #endif |
| 1112 | |
| 1113 | png_ptr->row_number++; |
| 1114 | if (png_ptr->row_number < png_ptr->num_rows) |
| 1115 | return; |
| 1116 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1117 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1118 | if (png_ptr->interlaced) |
| 1119 | { |
| 1120 | png_ptr->row_number = 0; |
| 1121 | png_memset_check(png_ptr, png_ptr->prev_row, 0, |
| 1122 | png_ptr->rowbytes + 1); |
| 1123 | do |
| 1124 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1125 | png_ptr->pass++; |
| 1126 | if ((png_ptr->pass == 1 && png_ptr->width < 5) || |
| 1127 | (png_ptr->pass == 3 && png_ptr->width < 3) || |
| 1128 | (png_ptr->pass == 5 && png_ptr->width < 2)) |
| 1129 | png_ptr->pass++; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1130 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1131 | if (png_ptr->pass > 7) |
| 1132 | png_ptr->pass--; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1133 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1134 | if (png_ptr->pass >= 7) |
| 1135 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1136 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1137 | png_ptr->iwidth = (png_ptr->width + |
| 1138 | png_pass_inc[png_ptr->pass] - 1 - |
| 1139 | png_pass_start[png_ptr->pass]) / |
| 1140 | png_pass_inc[png_ptr->pass]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1141 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1142 | png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, |
| 1143 | png_ptr->iwidth) + 1; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1144 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1145 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1146 | break; |
| 1147 | |
| 1148 | png_ptr->num_rows = (png_ptr->height + |
| 1149 | png_pass_yinc[png_ptr->pass] - 1 - |
| 1150 | png_pass_ystart[png_ptr->pass]) / |
| 1151 | png_pass_yinc[png_ptr->pass]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1152 | |
| 1153 | } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); |
| 1154 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1155 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1156 | } |
| 1157 | |
| 1158 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 1159 | void /* PRIVATE */ |
| 1160 | png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1161 | length) |
| 1162 | { |
| 1163 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1164 | { |
| 1165 | png_error(png_ptr, "Out of place tEXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1166 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1167 | } |
| 1168 | |
| 1169 | #ifdef PNG_MAX_MALLOC_64K |
| 1170 | png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1171 | |
| 1172 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1173 | { |
| 1174 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 1175 | png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1176 | length = (png_uint_32)65535L; |
| 1177 | } |
| 1178 | #endif |
| 1179 | |
| 1180 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1181 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1182 | png_ptr->current_text[length] = '\0'; |
| 1183 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1184 | png_ptr->current_text_size = (png_size_t)length; |
| 1185 | png_ptr->current_text_left = (png_size_t)length; |
| 1186 | png_ptr->process_mode = PNG_READ_tEXt_MODE; |
| 1187 | } |
| 1188 | |
| 1189 | void /* PRIVATE */ |
| 1190 | png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) |
| 1191 | { |
| 1192 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1193 | { |
| 1194 | png_size_t text_size; |
| 1195 | |
| 1196 | if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1197 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1198 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1199 | else |
| 1200 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1201 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1202 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1203 | png_ptr->current_text_left -= text_size; |
| 1204 | png_ptr->current_text_ptr += text_size; |
| 1205 | } |
| 1206 | if (!(png_ptr->current_text_left)) |
| 1207 | { |
| 1208 | png_textp text_ptr; |
| 1209 | png_charp text; |
| 1210 | png_charp key; |
| 1211 | int ret; |
| 1212 | |
| 1213 | if (png_ptr->buffer_size < 4) |
| 1214 | { |
| 1215 | png_push_save_buffer(png_ptr); |
| 1216 | return; |
| 1217 | } |
| 1218 | |
| 1219 | png_push_crc_finish(png_ptr); |
| 1220 | |
| 1221 | #if defined(PNG_MAX_MALLOC_64K) |
| 1222 | if (png_ptr->skip_length) |
| 1223 | return; |
| 1224 | #endif |
| 1225 | |
| 1226 | key = png_ptr->current_text; |
| 1227 | |
| 1228 | for (text = key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1229 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1230 | |
| 1231 | if (text < key + png_ptr->current_text_size) |
| 1232 | text++; |
| 1233 | |
| 1234 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1235 | (png_uint_32)png_sizeof(png_text)); |
| 1236 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 1237 | text_ptr->key = key; |
| 1238 | #ifdef PNG_iTXt_SUPPORTED |
| 1239 | text_ptr->lang = NULL; |
| 1240 | text_ptr->lang_key = NULL; |
| 1241 | #endif |
| 1242 | text_ptr->text = text; |
| 1243 | |
| 1244 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1245 | |
| 1246 | png_free(png_ptr, key); |
| 1247 | png_free(png_ptr, text_ptr); |
| 1248 | png_ptr->current_text = NULL; |
| 1249 | |
| 1250 | if (ret) |
| 1251 | png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1252 | } |
| 1253 | } |
| 1254 | #endif |
| 1255 | |
| 1256 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 1257 | void /* PRIVATE */ |
| 1258 | png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1259 | length) |
| 1260 | { |
| 1261 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1262 | { |
| 1263 | png_error(png_ptr, "Out of place zTXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1264 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | #ifdef PNG_MAX_MALLOC_64K |
| 1268 | /* We can't handle zTXt chunks > 64K, since we don't have enough space |
| 1269 | * to be able to store the uncompressed data. Actually, the threshold |
| 1270 | * is probably around 32K, but it isn't as definite as 64K is. |
| 1271 | */ |
| 1272 | if (length > (png_uint_32)65535L) |
| 1273 | { |
| 1274 | png_warning(png_ptr, "zTXt chunk too large to fit in memory"); |
| 1275 | png_push_crc_skip(png_ptr, length); |
| 1276 | return; |
| 1277 | } |
| 1278 | #endif |
| 1279 | |
| 1280 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1281 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1282 | png_ptr->current_text[length] = '\0'; |
| 1283 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1284 | png_ptr->current_text_size = (png_size_t)length; |
| 1285 | png_ptr->current_text_left = (png_size_t)length; |
| 1286 | png_ptr->process_mode = PNG_READ_zTXt_MODE; |
| 1287 | } |
| 1288 | |
| 1289 | void /* PRIVATE */ |
| 1290 | png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) |
| 1291 | { |
| 1292 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1293 | { |
| 1294 | png_size_t text_size; |
| 1295 | |
| 1296 | if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) |
| 1297 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1298 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1299 | else |
| 1300 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1301 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1302 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1303 | png_ptr->current_text_left -= text_size; |
| 1304 | png_ptr->current_text_ptr += text_size; |
| 1305 | } |
| 1306 | if (!(png_ptr->current_text_left)) |
| 1307 | { |
| 1308 | png_textp text_ptr; |
| 1309 | png_charp text; |
| 1310 | png_charp key; |
| 1311 | int ret; |
| 1312 | png_size_t text_size, key_size; |
| 1313 | |
| 1314 | if (png_ptr->buffer_size < 4) |
| 1315 | { |
| 1316 | png_push_save_buffer(png_ptr); |
| 1317 | return; |
| 1318 | } |
| 1319 | |
| 1320 | png_push_crc_finish(png_ptr); |
| 1321 | |
| 1322 | key = png_ptr->current_text; |
| 1323 | |
| 1324 | for (text = key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1325 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1326 | |
| 1327 | /* zTXt can't have zero text */ |
| 1328 | if (text >= key + png_ptr->current_text_size) |
| 1329 | { |
| 1330 | png_ptr->current_text = NULL; |
| 1331 | png_free(png_ptr, key); |
| 1332 | return; |
| 1333 | } |
| 1334 | |
| 1335 | text++; |
| 1336 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1337 | if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1338 | { |
| 1339 | png_ptr->current_text = NULL; |
| 1340 | png_free(png_ptr, key); |
| 1341 | return; |
| 1342 | } |
| 1343 | |
| 1344 | text++; |
| 1345 | |
| 1346 | png_ptr->zstream.next_in = (png_bytep )text; |
| 1347 | png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - |
| 1348 | (text - key)); |
| 1349 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1350 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1351 | |
| 1352 | key_size = text - key; |
| 1353 | text_size = 0; |
| 1354 | text = NULL; |
| 1355 | ret = Z_STREAM_END; |
| 1356 | |
| 1357 | while (png_ptr->zstream.avail_in) |
| 1358 | { |
| 1359 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 1360 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 1361 | { |
| 1362 | inflateReset(&png_ptr->zstream); |
| 1363 | png_ptr->zstream.avail_in = 0; |
| 1364 | png_ptr->current_text = NULL; |
| 1365 | png_free(png_ptr, key); |
| 1366 | png_free(png_ptr, text); |
| 1367 | return; |
| 1368 | } |
| 1369 | if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) |
| 1370 | { |
| 1371 | if (text == NULL) |
| 1372 | { |
| 1373 | text = (png_charp)png_malloc(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1374 | (png_uint_32)(png_ptr->zbuf_size |
| 1375 | - png_ptr->zstream.avail_out + key_size + 1)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1376 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1377 | png_memcpy(text + key_size, png_ptr->zbuf, |
| 1378 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1379 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1380 | png_memcpy(text, key, key_size); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1381 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1382 | text_size = key_size + png_ptr->zbuf_size - |
| 1383 | png_ptr->zstream.avail_out; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1384 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1385 | *(text + text_size) = '\0'; |
| 1386 | } |
| 1387 | else |
| 1388 | { |
| 1389 | png_charp tmp; |
| 1390 | |
| 1391 | tmp = text; |
| 1392 | text = (png_charp)png_malloc(png_ptr, text_size + |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1393 | (png_uint_32)(png_ptr->zbuf_size |
| 1394 | - png_ptr->zstream.avail_out + 1)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1395 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1396 | png_memcpy(text, tmp, text_size); |
| 1397 | png_free(png_ptr, tmp); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1398 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1399 | png_memcpy(text + text_size, png_ptr->zbuf, |
| 1400 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1401 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1402 | text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 1403 | *(text + text_size) = '\0'; |
| 1404 | } |
| 1405 | if (ret != Z_STREAM_END) |
| 1406 | { |
| 1407 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1408 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1409 | } |
| 1410 | } |
| 1411 | else |
| 1412 | { |
| 1413 | break; |
| 1414 | } |
| 1415 | |
| 1416 | if (ret == Z_STREAM_END) |
| 1417 | break; |
| 1418 | } |
| 1419 | |
| 1420 | inflateReset(&png_ptr->zstream); |
| 1421 | png_ptr->zstream.avail_in = 0; |
| 1422 | |
| 1423 | if (ret != Z_STREAM_END) |
| 1424 | { |
| 1425 | png_ptr->current_text = NULL; |
| 1426 | png_free(png_ptr, key); |
| 1427 | png_free(png_ptr, text); |
| 1428 | return; |
| 1429 | } |
| 1430 | |
| 1431 | png_ptr->current_text = NULL; |
| 1432 | png_free(png_ptr, key); |
| 1433 | key = text; |
| 1434 | text += key_size; |
| 1435 | |
| 1436 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1437 | (png_uint_32)png_sizeof(png_text)); |
| 1438 | text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; |
| 1439 | text_ptr->key = key; |
| 1440 | #ifdef PNG_iTXt_SUPPORTED |
| 1441 | text_ptr->lang = NULL; |
| 1442 | text_ptr->lang_key = NULL; |
| 1443 | #endif |
| 1444 | text_ptr->text = text; |
| 1445 | |
| 1446 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1447 | |
| 1448 | png_free(png_ptr, key); |
| 1449 | png_free(png_ptr, text_ptr); |
| 1450 | |
| 1451 | if (ret) |
| 1452 | png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1453 | } |
| 1454 | } |
| 1455 | #endif |
| 1456 | |
| 1457 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 1458 | void /* PRIVATE */ |
| 1459 | png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1460 | length) |
| 1461 | { |
| 1462 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1463 | { |
| 1464 | png_error(png_ptr, "Out of place iTXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1465 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | #ifdef PNG_MAX_MALLOC_64K |
| 1469 | png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1470 | |
| 1471 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1472 | { |
| 1473 | png_warning(png_ptr, "iTXt chunk too large to fit in memory"); |
| 1474 | png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1475 | length = (png_uint_32)65535L; |
| 1476 | } |
| 1477 | #endif |
| 1478 | |
| 1479 | png_ptr->current_text = (png_charp)png_malloc(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1480 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1481 | png_ptr->current_text[length] = '\0'; |
| 1482 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1483 | png_ptr->current_text_size = (png_size_t)length; |
| 1484 | png_ptr->current_text_left = (png_size_t)length; |
| 1485 | png_ptr->process_mode = PNG_READ_iTXt_MODE; |
| 1486 | } |
| 1487 | |
| 1488 | void /* PRIVATE */ |
| 1489 | png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) |
| 1490 | { |
| 1491 | |
| 1492 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1493 | { |
| 1494 | png_size_t text_size; |
| 1495 | |
| 1496 | if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1497 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1498 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1499 | else |
| 1500 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1501 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1502 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1503 | png_ptr->current_text_left -= text_size; |
| 1504 | png_ptr->current_text_ptr += text_size; |
| 1505 | } |
| 1506 | if (!(png_ptr->current_text_left)) |
| 1507 | { |
| 1508 | png_textp text_ptr; |
| 1509 | png_charp key; |
| 1510 | int comp_flag; |
| 1511 | png_charp lang; |
| 1512 | png_charp lang_key; |
| 1513 | png_charp text; |
| 1514 | int ret; |
| 1515 | |
| 1516 | if (png_ptr->buffer_size < 4) |
| 1517 | { |
| 1518 | png_push_save_buffer(png_ptr); |
| 1519 | return; |
| 1520 | } |
| 1521 | |
| 1522 | png_push_crc_finish(png_ptr); |
| 1523 | |
| 1524 | #if defined(PNG_MAX_MALLOC_64K) |
| 1525 | if (png_ptr->skip_length) |
| 1526 | return; |
| 1527 | #endif |
| 1528 | |
| 1529 | key = png_ptr->current_text; |
| 1530 | |
| 1531 | for (lang = key; *lang; lang++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1532 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1533 | |
| 1534 | if (lang < key + png_ptr->current_text_size - 3) |
| 1535 | lang++; |
| 1536 | |
| 1537 | comp_flag = *lang++; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1538 | lang++; /* Skip comp_type, always zero */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1539 | |
| 1540 | for (lang_key = lang; *lang_key; lang_key++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1541 | /* Empty loop */ ; |
| 1542 | |
| 1543 | lang_key++; /* Skip NUL separator */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1544 | |
| 1545 | text=lang_key; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1546 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1547 | if (lang_key < key + png_ptr->current_text_size - 1) |
| 1548 | { |
| 1549 | for (; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1550 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1551 | } |
| 1552 | |
| 1553 | if (text < key + png_ptr->current_text_size) |
| 1554 | text++; |
| 1555 | |
| 1556 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1557 | (png_uint_32)png_sizeof(png_text)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1558 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1559 | text_ptr->compression = comp_flag + 2; |
| 1560 | text_ptr->key = key; |
| 1561 | text_ptr->lang = lang; |
| 1562 | text_ptr->lang_key = lang_key; |
| 1563 | text_ptr->text = text; |
| 1564 | text_ptr->text_length = 0; |
| 1565 | text_ptr->itxt_length = png_strlen(text); |
| 1566 | |
| 1567 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1568 | |
| 1569 | png_ptr->current_text = NULL; |
| 1570 | |
| 1571 | png_free(png_ptr, text_ptr); |
| 1572 | if (ret) |
| 1573 | png_warning(png_ptr, "Insufficient memory to store iTXt chunk."); |
| 1574 | } |
| 1575 | } |
| 1576 | #endif |
| 1577 | |
| 1578 | /* This function is called when we haven't found a handler for this |
| 1579 | * chunk. If there isn't a problem with the chunk itself (ie a bad chunk |
| 1580 | * name or a critical chunk), the chunk is (currently) silently ignored. |
| 1581 | */ |
| 1582 | void /* PRIVATE */ |
| 1583 | png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1584 | length) |
| 1585 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1586 | png_uint_32 skip = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1587 | |
| 1588 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 1589 | { |
| 1590 | #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1591 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 1592 | PNG_HANDLE_CHUNK_ALWAYS |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1593 | #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1594 | && png_ptr->read_user_chunk_fn == NULL |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1595 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1596 | ) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1597 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1598 | png_chunk_error(png_ptr, "unknown critical chunk"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1599 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1600 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1601 | } |
| 1602 | |
| 1603 | #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) |
| 1604 | if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
| 1605 | { |
| 1606 | #ifdef PNG_MAX_MALLOC_64K |
| 1607 | if (length > (png_uint_32)65535L) |
| 1608 | { |
| 1609 | png_warning(png_ptr, "unknown chunk too large to fit in memory"); |
| 1610 | skip = length - (png_uint_32)65535L; |
| 1611 | length = (png_uint_32)65535L; |
| 1612 | } |
| 1613 | #endif |
| 1614 | png_memcpy((png_charp)png_ptr->unknown_chunk.name, |
| 1615 | (png_charp)png_ptr->chunk_name, |
| 1616 | png_sizeof(png_ptr->unknown_chunk.name)); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1617 | png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] |
| 1618 | = '\0'; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1619 | |
| 1620 | png_ptr->unknown_chunk.size = (png_size_t)length; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1621 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1622 | if (length == 0) |
| 1623 | png_ptr->unknown_chunk.data = NULL; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1624 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1625 | else |
| 1626 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1627 | png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, |
| 1628 | (png_uint_32)length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1629 | png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); |
| 1630 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1631 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1632 | #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1633 | if (png_ptr->read_user_chunk_fn != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1634 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1635 | /* Callback to user unknown chunk handler */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1636 | int ret; |
| 1637 | ret = (*(png_ptr->read_user_chunk_fn)) |
| 1638 | (png_ptr, &png_ptr->unknown_chunk); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1639 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1640 | if (ret < 0) |
| 1641 | png_chunk_error(png_ptr, "error in user chunk"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1642 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1643 | if (ret == 0) |
| 1644 | { |
| 1645 | if (!(png_ptr->chunk_name[0] & 0x20)) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1646 | 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] | 1647 | PNG_HANDLE_CHUNK_ALWAYS) |
| 1648 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 1649 | png_set_unknown_chunks(png_ptr, info_ptr, |
| 1650 | &png_ptr->unknown_chunk, 1); |
| 1651 | } |
| 1652 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1653 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1654 | else |
| 1655 | #endif |
| 1656 | png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); |
| 1657 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 1658 | png_ptr->unknown_chunk.data = NULL; |
| 1659 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1660 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1661 | else |
| 1662 | #endif |
| 1663 | skip=length; |
| 1664 | png_push_crc_skip(png_ptr, skip); |
| 1665 | } |
| 1666 | |
| 1667 | void /* PRIVATE */ |
| 1668 | png_push_have_info(png_structp png_ptr, png_infop info_ptr) |
| 1669 | { |
| 1670 | if (png_ptr->info_fn != NULL) |
| 1671 | (*(png_ptr->info_fn))(png_ptr, info_ptr); |
| 1672 | } |
| 1673 | |
| 1674 | void /* PRIVATE */ |
| 1675 | png_push_have_end(png_structp png_ptr, png_infop info_ptr) |
| 1676 | { |
| 1677 | if (png_ptr->end_fn != NULL) |
| 1678 | (*(png_ptr->end_fn))(png_ptr, info_ptr); |
| 1679 | } |
| 1680 | |
| 1681 | void /* PRIVATE */ |
| 1682 | png_push_have_row(png_structp png_ptr, png_bytep row) |
| 1683 | { |
| 1684 | if (png_ptr->row_fn != NULL) |
| 1685 | (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, |
| 1686 | (int)png_ptr->pass); |
| 1687 | } |
| 1688 | |
| 1689 | void PNGAPI |
| 1690 | png_progressive_combine_row (png_structp png_ptr, |
| 1691 | png_bytep old_row, png_bytep new_row) |
| 1692 | { |
| 1693 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1694 | PNG_CONST int FARDATA png_pass_dsp_mask[7] = |
| 1695 | {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 1696 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1697 | if (png_ptr == NULL) |
| 1698 | return; |
| 1699 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1700 | if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ |
| 1701 | png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); |
| 1702 | } |
| 1703 | |
| 1704 | void PNGAPI |
| 1705 | png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, |
| 1706 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1707 | png_progressive_end_ptr end_fn) |
| 1708 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1709 | if (png_ptr == NULL) |
| 1710 | return; |
| 1711 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1712 | png_ptr->info_fn = info_fn; |
| 1713 | png_ptr->row_fn = row_fn; |
| 1714 | png_ptr->end_fn = end_fn; |
| 1715 | |
| 1716 | png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); |
| 1717 | } |
| 1718 | |
| 1719 | png_voidp PNGAPI |
| 1720 | png_get_progressive_ptr(png_structp png_ptr) |
| 1721 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame^] | 1722 | if (png_ptr == NULL) |
| 1723 | return (NULL); |
| 1724 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1725 | return png_ptr->io_ptr; |
| 1726 | } |
| 1727 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |