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 | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 4 | * Last changed in libpng 1.2.44 [June 26, 2010] |
| 5 | * Copyright (c) 1998-2010 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 |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 15 | #define PNG_NO_PEDANTIC_WARNINGS |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 16 | #include "png.h" |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 17 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 18 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 19 | /* Push model modes */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 20 | #define PNG_READ_SIG_MODE 0 |
| 21 | #define PNG_READ_CHUNK_MODE 1 |
| 22 | #define PNG_READ_IDAT_MODE 2 |
| 23 | #define PNG_SKIP_MODE 3 |
| 24 | #define PNG_READ_tEXt_MODE 4 |
| 25 | #define PNG_READ_zTXt_MODE 5 |
| 26 | #define PNG_READ_DONE_MODE 6 |
| 27 | #define PNG_READ_iTXt_MODE 7 |
| 28 | #define PNG_ERROR_MODE 8 |
| 29 | |
| 30 | void PNGAPI |
| 31 | png_process_data(png_structp png_ptr, png_infop info_ptr, |
| 32 | png_bytep buffer, png_size_t buffer_size) |
| 33 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 34 | if (png_ptr == NULL || info_ptr == NULL) |
| 35 | return; |
| 36 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 37 | png_push_restore_buffer(png_ptr, buffer, buffer_size); |
| 38 | |
| 39 | while (png_ptr->buffer_size) |
| 40 | { |
| 41 | png_process_some_data(png_ptr, info_ptr); |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | /* What we do with the incoming data depends on what we were previously |
| 46 | * doing before we ran out of data... |
| 47 | */ |
| 48 | void /* PRIVATE */ |
| 49 | png_process_some_data(png_structp png_ptr, png_infop info_ptr) |
| 50 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 51 | if (png_ptr == NULL) |
| 52 | return; |
| 53 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 54 | switch (png_ptr->process_mode) |
| 55 | { |
| 56 | case PNG_READ_SIG_MODE: |
| 57 | { |
| 58 | png_push_read_sig(png_ptr, info_ptr); |
| 59 | break; |
| 60 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 61 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 62 | case PNG_READ_CHUNK_MODE: |
| 63 | { |
| 64 | png_push_read_chunk(png_ptr, info_ptr); |
| 65 | break; |
| 66 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 67 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 68 | case PNG_READ_IDAT_MODE: |
| 69 | { |
| 70 | png_push_read_IDAT(png_ptr); |
| 71 | break; |
| 72 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 73 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 74 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 75 | case PNG_READ_tEXt_MODE: |
| 76 | { |
| 77 | png_push_read_tEXt(png_ptr, info_ptr); |
| 78 | break; |
| 79 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 80 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 81 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 82 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 83 | case PNG_READ_zTXt_MODE: |
| 84 | { |
| 85 | png_push_read_zTXt(png_ptr, info_ptr); |
| 86 | break; |
| 87 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 88 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 89 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 90 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 91 | case PNG_READ_iTXt_MODE: |
| 92 | { |
| 93 | png_push_read_iTXt(png_ptr, info_ptr); |
| 94 | break; |
| 95 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 96 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 97 | #endif |
| 98 | case PNG_SKIP_MODE: |
| 99 | { |
| 100 | png_push_crc_finish(png_ptr); |
| 101 | break; |
| 102 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 103 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 104 | default: |
| 105 | { |
| 106 | png_ptr->buffer_size = 0; |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* Read any remaining signature bytes from the stream and compare them with |
| 113 | * the correct PNG signature. It is possible that this routine is called |
| 114 | * with bytes already read from the signature, either because they have been |
| 115 | * checked by the calling application, or because of multiple calls to this |
| 116 | * routine. |
| 117 | */ |
| 118 | void /* PRIVATE */ |
| 119 | png_push_read_sig(png_structp png_ptr, png_infop info_ptr) |
| 120 | { |
| 121 | png_size_t num_checked = png_ptr->sig_bytes, |
| 122 | num_to_check = 8 - num_checked; |
| 123 | |
| 124 | if (png_ptr->buffer_size < num_to_check) |
| 125 | { |
| 126 | num_to_check = png_ptr->buffer_size; |
| 127 | } |
| 128 | |
| 129 | png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]), |
| 130 | num_to_check); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 131 | 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] | 132 | |
| 133 | if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check)) |
| 134 | { |
| 135 | if (num_checked < 4 && |
| 136 | png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4)) |
| 137 | png_error(png_ptr, "Not a PNG file"); |
| 138 | else |
| 139 | png_error(png_ptr, "PNG file corrupted by ASCII conversion"); |
| 140 | } |
| 141 | else |
| 142 | { |
| 143 | if (png_ptr->sig_bytes >= 8) |
| 144 | { |
| 145 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | void /* PRIVATE */ |
| 151 | png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) |
| 152 | { |
| 153 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 154 | PNG_CONST PNG_IHDR; |
| 155 | PNG_CONST PNG_IDAT; |
| 156 | PNG_CONST PNG_IEND; |
| 157 | PNG_CONST PNG_PLTE; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 158 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 159 | PNG_CONST PNG_bKGD; |
| 160 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 161 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 162 | PNG_CONST PNG_cHRM; |
| 163 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 164 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 165 | PNG_CONST PNG_gAMA; |
| 166 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 167 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 168 | PNG_CONST PNG_hIST; |
| 169 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 170 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 171 | PNG_CONST PNG_iCCP; |
| 172 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 173 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 174 | PNG_CONST PNG_iTXt; |
| 175 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 176 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 177 | PNG_CONST PNG_oFFs; |
| 178 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 179 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 180 | PNG_CONST PNG_pCAL; |
| 181 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 182 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 183 | PNG_CONST PNG_pHYs; |
| 184 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 185 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 186 | PNG_CONST PNG_sBIT; |
| 187 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 188 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 189 | PNG_CONST PNG_sCAL; |
| 190 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 191 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 192 | PNG_CONST PNG_sRGB; |
| 193 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 194 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 195 | PNG_CONST PNG_sPLT; |
| 196 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 197 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 198 | PNG_CONST PNG_tEXt; |
| 199 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 200 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 201 | PNG_CONST PNG_tIME; |
| 202 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 203 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 204 | PNG_CONST PNG_tRNS; |
| 205 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 206 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 207 | PNG_CONST PNG_zTXt; |
| 208 | #endif |
| 209 | #endif /* PNG_USE_LOCAL_ARRAYS */ |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 210 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 211 | /* First we make sure we have enough data for the 4 byte chunk name |
| 212 | * and the 4 byte chunk length before proceeding with decoding the |
| 213 | * chunk data. To fully decode each of these chunks, we also make |
| 214 | * sure we have enough data in the buffer for the 4 byte CRC at the |
| 215 | * end of every chunk (except IDAT, which is handled separately). |
| 216 | */ |
| 217 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 218 | { |
| 219 | png_byte chunk_length[4]; |
| 220 | |
| 221 | if (png_ptr->buffer_size < 8) |
| 222 | { |
| 223 | png_push_save_buffer(png_ptr); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 228 | 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] | 229 | png_reset_crc(png_ptr); |
| 230 | 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] | 231 | 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] | 232 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 233 | } |
| 234 | |
| 235 | 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] | 236 | if (png_ptr->mode & PNG_AFTER_IDAT) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 237 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; |
| 238 | |
| 239 | if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4)) |
| 240 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 241 | if (png_ptr->push_length != 13) |
| 242 | png_error(png_ptr, "Invalid IHDR length"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 243 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 244 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 245 | { |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 246 | png_push_save_buffer(png_ptr); |
| 247 | return; |
| 248 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 249 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 250 | png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length); |
| 251 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 252 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 253 | else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4)) |
| 254 | { |
| 255 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 256 | { |
| 257 | png_push_save_buffer(png_ptr); |
| 258 | return; |
| 259 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 260 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 261 | png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length); |
| 262 | |
| 263 | png_ptr->process_mode = PNG_READ_DONE_MODE; |
| 264 | png_push_have_end(png_ptr, info_ptr); |
| 265 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 266 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 267 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 268 | else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name)) |
| 269 | { |
| 270 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 271 | { |
| 272 | png_push_save_buffer(png_ptr); |
| 273 | return; |
| 274 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 275 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 276 | if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 277 | png_ptr->mode |= PNG_HAVE_IDAT; |
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 | png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 280 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 281 | if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 282 | png_ptr->mode |= PNG_HAVE_PLTE; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 283 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 284 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 285 | { |
| 286 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 287 | png_error(png_ptr, "Missing IHDR before IDAT"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 288 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 289 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 290 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 291 | png_error(png_ptr, "Missing PLTE before IDAT"); |
| 292 | } |
| 293 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 294 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 295 | #endif |
| 296 | else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4)) |
| 297 | { |
| 298 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 299 | { |
| 300 | png_push_save_buffer(png_ptr); |
| 301 | return; |
| 302 | } |
| 303 | png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); |
| 304 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 305 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 306 | else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 307 | { |
| 308 | /* If we reach an IDAT chunk, this means we have read all of the |
| 309 | * header chunks, and we can start reading the image (or if this |
| 310 | * is called after the image has been read - we have an error). |
| 311 | */ |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 312 | |
| 313 | if (!(png_ptr->mode & PNG_HAVE_IHDR)) |
| 314 | png_error(png_ptr, "Missing IHDR before IDAT"); |
| 315 | |
| 316 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && |
| 317 | !(png_ptr->mode & PNG_HAVE_PLTE)) |
| 318 | png_error(png_ptr, "Missing PLTE before IDAT"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 319 | |
| 320 | if (png_ptr->mode & PNG_HAVE_IDAT) |
| 321 | { |
| 322 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 323 | if (png_ptr->push_length == 0) |
| 324 | return; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 325 | |
| 326 | if (png_ptr->mode & PNG_AFTER_IDAT) |
| 327 | png_error(png_ptr, "Too many IDAT's found"); |
| 328 | } |
| 329 | |
| 330 | png_ptr->idat_size = png_ptr->push_length; |
| 331 | png_ptr->mode |= PNG_HAVE_IDAT; |
| 332 | png_ptr->process_mode = PNG_READ_IDAT_MODE; |
| 333 | png_push_have_info(png_ptr, info_ptr); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 334 | png_ptr->zstream.avail_out = |
| 335 | (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, |
| 336 | png_ptr->iwidth) + 1; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 337 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 338 | return; |
| 339 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 340 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 341 | #ifdef PNG_READ_gAMA_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 342 | else if (!png_memcmp(png_ptr->chunk_name, png_gAMA, 4)) |
| 343 | { |
| 344 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 345 | { |
| 346 | png_push_save_buffer(png_ptr); |
| 347 | return; |
| 348 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 349 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 350 | png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length); |
| 351 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 352 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 353 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 354 | #ifdef PNG_READ_sBIT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 355 | else if (!png_memcmp(png_ptr->chunk_name, png_sBIT, 4)) |
| 356 | { |
| 357 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 358 | { |
| 359 | png_push_save_buffer(png_ptr); |
| 360 | return; |
| 361 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 362 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 363 | png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length); |
| 364 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 365 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 366 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 367 | #ifdef PNG_READ_cHRM_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 368 | else if (!png_memcmp(png_ptr->chunk_name, png_cHRM, 4)) |
| 369 | { |
| 370 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 371 | { |
| 372 | png_push_save_buffer(png_ptr); |
| 373 | return; |
| 374 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 375 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 376 | png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length); |
| 377 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 378 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 379 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 380 | #ifdef PNG_READ_sRGB_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 381 | else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4)) |
| 382 | { |
| 383 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 384 | { |
| 385 | png_push_save_buffer(png_ptr); |
| 386 | return; |
| 387 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 388 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 389 | png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length); |
| 390 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 391 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 392 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 393 | #ifdef PNG_READ_iCCP_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 394 | else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4)) |
| 395 | { |
| 396 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 397 | { |
| 398 | png_push_save_buffer(png_ptr); |
| 399 | return; |
| 400 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 401 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 402 | png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length); |
| 403 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 404 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 405 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 406 | #ifdef PNG_READ_sPLT_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 407 | else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4)) |
| 408 | { |
| 409 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 410 | { |
| 411 | png_push_save_buffer(png_ptr); |
| 412 | return; |
| 413 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 414 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 415 | png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length); |
| 416 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 417 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 418 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 419 | #ifdef PNG_READ_tRNS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 420 | else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4)) |
| 421 | { |
| 422 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 423 | { |
| 424 | png_push_save_buffer(png_ptr); |
| 425 | return; |
| 426 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 427 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 428 | png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length); |
| 429 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 430 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 431 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 432 | #ifdef PNG_READ_bKGD_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 433 | else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4)) |
| 434 | { |
| 435 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 436 | { |
| 437 | png_push_save_buffer(png_ptr); |
| 438 | return; |
| 439 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 440 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 441 | png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length); |
| 442 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 443 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 444 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 445 | #ifdef PNG_READ_hIST_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 446 | else if (!png_memcmp(png_ptr->chunk_name, png_hIST, 4)) |
| 447 | { |
| 448 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 449 | { |
| 450 | png_push_save_buffer(png_ptr); |
| 451 | return; |
| 452 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 453 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 454 | png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length); |
| 455 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 456 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 457 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 458 | #ifdef PNG_READ_pHYs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 459 | else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4)) |
| 460 | { |
| 461 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 462 | { |
| 463 | png_push_save_buffer(png_ptr); |
| 464 | return; |
| 465 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 466 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 467 | png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length); |
| 468 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 469 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 470 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 471 | #ifdef PNG_READ_oFFs_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 472 | else if (!png_memcmp(png_ptr->chunk_name, png_oFFs, 4)) |
| 473 | { |
| 474 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 475 | { |
| 476 | png_push_save_buffer(png_ptr); |
| 477 | return; |
| 478 | } |
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 | png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length); |
| 481 | } |
| 482 | #endif |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 483 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 484 | #ifdef PNG_READ_pCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 485 | else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4)) |
| 486 | { |
| 487 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 488 | { |
| 489 | png_push_save_buffer(png_ptr); |
| 490 | return; |
| 491 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 492 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 493 | png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 494 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 495 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 496 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 497 | #ifdef PNG_READ_sCAL_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 498 | else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4)) |
| 499 | { |
| 500 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 501 | { |
| 502 | png_push_save_buffer(png_ptr); |
| 503 | return; |
| 504 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 505 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 506 | png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length); |
| 507 | } |
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 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 510 | #ifdef PNG_READ_tIME_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 511 | else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4)) |
| 512 | { |
| 513 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 514 | { |
| 515 | png_push_save_buffer(png_ptr); |
| 516 | return; |
| 517 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 518 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 519 | png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length); |
| 520 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 521 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 522 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 523 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 524 | else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4)) |
| 525 | { |
| 526 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 527 | { |
| 528 | png_push_save_buffer(png_ptr); |
| 529 | return; |
| 530 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 531 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 532 | png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length); |
| 533 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 534 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 535 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 536 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 537 | else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4)) |
| 538 | { |
| 539 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 540 | { |
| 541 | png_push_save_buffer(png_ptr); |
| 542 | return; |
| 543 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 544 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 545 | png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 546 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 547 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 548 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 549 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 550 | else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4)) |
| 551 | { |
| 552 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 553 | { |
| 554 | png_push_save_buffer(png_ptr); |
| 555 | return; |
| 556 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 557 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 558 | png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); |
| 559 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 560 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 561 | #endif |
| 562 | else |
| 563 | { |
| 564 | if (png_ptr->push_length + 4 > png_ptr->buffer_size) |
| 565 | { |
| 566 | png_push_save_buffer(png_ptr); |
| 567 | return; |
| 568 | } |
| 569 | png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); |
| 570 | } |
| 571 | |
| 572 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 573 | } |
| 574 | |
| 575 | void /* PRIVATE */ |
| 576 | png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) |
| 577 | { |
| 578 | png_ptr->process_mode = PNG_SKIP_MODE; |
| 579 | png_ptr->skip_length = skip; |
| 580 | } |
| 581 | |
| 582 | void /* PRIVATE */ |
| 583 | png_push_crc_finish(png_structp png_ptr) |
| 584 | { |
| 585 | if (png_ptr->skip_length && png_ptr->save_buffer_size) |
| 586 | { |
| 587 | png_size_t save_size; |
| 588 | |
| 589 | if (png_ptr->skip_length < (png_uint_32)png_ptr->save_buffer_size) |
| 590 | save_size = (png_size_t)png_ptr->skip_length; |
| 591 | else |
| 592 | save_size = png_ptr->save_buffer_size; |
| 593 | |
| 594 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
| 595 | |
| 596 | png_ptr->skip_length -= save_size; |
| 597 | png_ptr->buffer_size -= save_size; |
| 598 | png_ptr->save_buffer_size -= save_size; |
| 599 | png_ptr->save_buffer_ptr += save_size; |
| 600 | } |
| 601 | if (png_ptr->skip_length && png_ptr->current_buffer_size) |
| 602 | { |
| 603 | png_size_t save_size; |
| 604 | |
| 605 | if (png_ptr->skip_length < (png_uint_32)png_ptr->current_buffer_size) |
| 606 | save_size = (png_size_t)png_ptr->skip_length; |
| 607 | else |
| 608 | save_size = png_ptr->current_buffer_size; |
| 609 | |
| 610 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
| 611 | |
| 612 | png_ptr->skip_length -= save_size; |
| 613 | png_ptr->buffer_size -= save_size; |
| 614 | png_ptr->current_buffer_size -= save_size; |
| 615 | png_ptr->current_buffer_ptr += save_size; |
| 616 | } |
| 617 | if (!png_ptr->skip_length) |
| 618 | { |
| 619 | if (png_ptr->buffer_size < 4) |
| 620 | { |
| 621 | png_push_save_buffer(png_ptr); |
| 622 | return; |
| 623 | } |
| 624 | |
| 625 | png_crc_finish(png_ptr, 0); |
| 626 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | void PNGAPI |
| 631 | png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length) |
| 632 | { |
| 633 | png_bytep ptr; |
| 634 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 635 | if (png_ptr == NULL) |
| 636 | return; |
| 637 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 638 | ptr = buffer; |
| 639 | if (png_ptr->save_buffer_size) |
| 640 | { |
| 641 | png_size_t save_size; |
| 642 | |
| 643 | if (length < png_ptr->save_buffer_size) |
| 644 | save_size = length; |
| 645 | else |
| 646 | save_size = png_ptr->save_buffer_size; |
| 647 | |
| 648 | png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); |
| 649 | length -= save_size; |
| 650 | ptr += save_size; |
| 651 | png_ptr->buffer_size -= save_size; |
| 652 | png_ptr->save_buffer_size -= save_size; |
| 653 | png_ptr->save_buffer_ptr += save_size; |
| 654 | } |
| 655 | if (length && png_ptr->current_buffer_size) |
| 656 | { |
| 657 | png_size_t save_size; |
| 658 | |
| 659 | if (length < png_ptr->current_buffer_size) |
| 660 | save_size = length; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 661 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 662 | else |
| 663 | save_size = png_ptr->current_buffer_size; |
| 664 | |
| 665 | png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); |
| 666 | png_ptr->buffer_size -= save_size; |
| 667 | png_ptr->current_buffer_size -= save_size; |
| 668 | png_ptr->current_buffer_ptr += save_size; |
| 669 | } |
| 670 | } |
| 671 | |
| 672 | void /* PRIVATE */ |
| 673 | png_push_save_buffer(png_structp png_ptr) |
| 674 | { |
| 675 | if (png_ptr->save_buffer_size) |
| 676 | { |
| 677 | if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) |
| 678 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 679 | png_size_t i, istop; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 680 | png_bytep sp; |
| 681 | png_bytep dp; |
| 682 | |
| 683 | istop = png_ptr->save_buffer_size; |
| 684 | for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer; |
| 685 | i < istop; i++, sp++, dp++) |
| 686 | { |
| 687 | *dp = *sp; |
| 688 | } |
| 689 | } |
| 690 | } |
| 691 | if (png_ptr->save_buffer_size + png_ptr->current_buffer_size > |
| 692 | png_ptr->save_buffer_max) |
| 693 | { |
| 694 | png_size_t new_max; |
| 695 | png_bytep old_buffer; |
| 696 | |
| 697 | if (png_ptr->save_buffer_size > PNG_SIZE_MAX - |
| 698 | (png_ptr->current_buffer_size + 256)) |
| 699 | { |
| 700 | png_error(png_ptr, "Potential overflow of save_buffer"); |
| 701 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 702 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 703 | new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; |
| 704 | old_buffer = png_ptr->save_buffer; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 705 | png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 706 | (png_uint_32)new_max); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 707 | if (png_ptr->save_buffer == NULL) |
| 708 | { |
| 709 | png_free(png_ptr, old_buffer); |
| 710 | png_error(png_ptr, "Insufficient memory for save_buffer"); |
| 711 | } |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 712 | png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); |
| 713 | png_free(png_ptr, old_buffer); |
| 714 | png_ptr->save_buffer_max = new_max; |
| 715 | } |
| 716 | if (png_ptr->current_buffer_size) |
| 717 | { |
| 718 | png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, |
| 719 | png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); |
| 720 | png_ptr->save_buffer_size += png_ptr->current_buffer_size; |
| 721 | png_ptr->current_buffer_size = 0; |
| 722 | } |
| 723 | png_ptr->save_buffer_ptr = png_ptr->save_buffer; |
| 724 | png_ptr->buffer_size = 0; |
| 725 | } |
| 726 | |
| 727 | void /* PRIVATE */ |
| 728 | png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, |
| 729 | png_size_t buffer_length) |
| 730 | { |
| 731 | png_ptr->current_buffer = buffer; |
| 732 | png_ptr->current_buffer_size = buffer_length; |
| 733 | png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size; |
| 734 | png_ptr->current_buffer_ptr = png_ptr->current_buffer; |
| 735 | } |
| 736 | |
| 737 | void /* PRIVATE */ |
| 738 | png_push_read_IDAT(png_structp png_ptr) |
| 739 | { |
| 740 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 741 | PNG_CONST PNG_IDAT; |
| 742 | #endif |
| 743 | if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) |
| 744 | { |
| 745 | png_byte chunk_length[4]; |
| 746 | |
| 747 | if (png_ptr->buffer_size < 8) |
| 748 | { |
| 749 | png_push_save_buffer(png_ptr); |
| 750 | return; |
| 751 | } |
| 752 | |
| 753 | png_push_fill_buffer(png_ptr, chunk_length, 4); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 754 | 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] | 755 | png_reset_crc(png_ptr); |
| 756 | png_crc_read(png_ptr, png_ptr->chunk_name, 4); |
| 757 | png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; |
| 758 | |
| 759 | if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) |
| 760 | { |
| 761 | png_ptr->process_mode = PNG_READ_CHUNK_MODE; |
| 762 | if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
| 763 | png_error(png_ptr, "Not enough compressed data"); |
| 764 | return; |
| 765 | } |
| 766 | |
| 767 | png_ptr->idat_size = png_ptr->push_length; |
| 768 | } |
| 769 | if (png_ptr->idat_size && png_ptr->save_buffer_size) |
| 770 | { |
| 771 | png_size_t save_size; |
| 772 | |
| 773 | if (png_ptr->idat_size < (png_uint_32)png_ptr->save_buffer_size) |
| 774 | { |
| 775 | save_size = (png_size_t)png_ptr->idat_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 776 | |
| 777 | /* Check for overflow */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 778 | 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] | 779 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 780 | } |
| 781 | else |
| 782 | save_size = png_ptr->save_buffer_size; |
| 783 | |
| 784 | png_calculate_crc(png_ptr, png_ptr->save_buffer_ptr, save_size); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 785 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 786 | 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] | 787 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 788 | png_ptr->idat_size -= save_size; |
| 789 | png_ptr->buffer_size -= save_size; |
| 790 | png_ptr->save_buffer_size -= save_size; |
| 791 | png_ptr->save_buffer_ptr += save_size; |
| 792 | } |
| 793 | if (png_ptr->idat_size && png_ptr->current_buffer_size) |
| 794 | { |
| 795 | png_size_t save_size; |
| 796 | |
| 797 | if (png_ptr->idat_size < (png_uint_32)png_ptr->current_buffer_size) |
| 798 | { |
| 799 | save_size = (png_size_t)png_ptr->idat_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 800 | |
| 801 | /* Check for overflow */ |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 802 | 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] | 803 | png_error(png_ptr, "save_size overflowed in pngpread"); |
| 804 | } |
| 805 | else |
| 806 | save_size = png_ptr->current_buffer_size; |
| 807 | |
| 808 | png_calculate_crc(png_ptr, png_ptr->current_buffer_ptr, save_size); |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 809 | |
| 810 | png_process_IDAT_data(png_ptr, png_ptr->current_buffer_ptr, save_size); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 811 | |
| 812 | png_ptr->idat_size -= save_size; |
| 813 | png_ptr->buffer_size -= save_size; |
| 814 | png_ptr->current_buffer_size -= save_size; |
| 815 | png_ptr->current_buffer_ptr += save_size; |
| 816 | } |
| 817 | if (!png_ptr->idat_size) |
| 818 | { |
| 819 | if (png_ptr->buffer_size < 4) |
| 820 | { |
| 821 | png_push_save_buffer(png_ptr); |
| 822 | return; |
| 823 | } |
| 824 | |
| 825 | png_crc_finish(png_ptr, 0); |
| 826 | png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; |
| 827 | png_ptr->mode |= PNG_AFTER_IDAT; |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | void /* PRIVATE */ |
| 832 | png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, |
| 833 | png_size_t buffer_length) |
| 834 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 835 | /* The caller checks for a non-zero buffer length. */ |
| 836 | if (!(buffer_length > 0) || buffer == NULL) |
| 837 | png_error(png_ptr, "No IDAT data (internal error)"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 838 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 839 | /* This routine must process all the data it has been given |
| 840 | * before returning, calling the row callback as required to |
| 841 | * handle the uncompressed results. |
| 842 | */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 843 | png_ptr->zstream.next_in = buffer; |
| 844 | png_ptr->zstream.avail_in = (uInt)buffer_length; |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 845 | |
| 846 | /* Keep going until the decompressed data is all processed |
| 847 | * or the stream marked as finished. |
| 848 | */ |
| 849 | while (png_ptr->zstream.avail_in > 0 && |
| 850 | !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 851 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 852 | int ret; |
| 853 | |
| 854 | /* We have data for zlib, but we must check that zlib |
| 855 | * has somewhere to put the results. It doesn't matter |
| 856 | * if we don't expect any results -- it may be the input |
| 857 | * data is just the LZ end code. |
| 858 | */ |
| 859 | if (!(png_ptr->zstream.avail_out > 0)) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 860 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 861 | png_ptr->zstream.avail_out = |
| 862 | (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, |
| 863 | png_ptr->iwidth) + 1; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 864 | png_ptr->zstream.next_out = png_ptr->row_buf; |
| 865 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 866 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 867 | /* Using Z_SYNC_FLUSH here means that an unterminated |
| 868 | * LZ stream can still be handled (a stream with a missing |
| 869 | * end code), otherwise (Z_NO_FLUSH) a future zlib |
| 870 | * implementation might defer output and, therefore, |
| 871 | * change the current behavior. (See comments in inflate.c |
| 872 | * for why this doesn't happen at present with zlib 1.2.5.) |
| 873 | */ |
| 874 | ret = inflate(&png_ptr->zstream, Z_SYNC_FLUSH); |
| 875 | |
| 876 | /* Check for any failure before proceeding. */ |
| 877 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 878 | { |
| 879 | /* Terminate the decompression. */ |
| 880 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 881 | |
| 882 | /* This may be a truncated stream (missing or |
| 883 | * damaged end code). Treat that as a warning. |
| 884 | */ |
| 885 | if (png_ptr->row_number >= png_ptr->num_rows || |
| 886 | png_ptr->pass > 6) |
| 887 | png_warning(png_ptr, "Truncated compressed data in IDAT"); |
| 888 | else |
| 889 | png_error(png_ptr, "Decompression error in IDAT"); |
| 890 | |
| 891 | /* Skip the check on unprocessed input */ |
| 892 | return; |
| 893 | } |
| 894 | |
| 895 | /* Did inflate output any data? */ |
| 896 | if (png_ptr->zstream.next_out != png_ptr->row_buf) |
| 897 | { |
| 898 | /* Is this unexpected data after the last row? |
| 899 | * If it is, artificially terminate the LZ output |
| 900 | * here. |
| 901 | */ |
| 902 | if (png_ptr->row_number >= png_ptr->num_rows || |
| 903 | png_ptr->pass > 6) |
| 904 | { |
| 905 | /* Extra data. */ |
| 906 | png_warning(png_ptr, "Extra compressed data in IDAT"); |
| 907 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
| 908 | /* Do no more processing; skip the unprocessed |
| 909 | * input check below. |
| 910 | */ |
| 911 | return; |
| 912 | } |
| 913 | |
| 914 | /* Do we have a complete row? */ |
| 915 | if (png_ptr->zstream.avail_out == 0) |
| 916 | png_push_process_row(png_ptr); |
| 917 | } |
| 918 | |
| 919 | /* And check for the end of the stream. */ |
| 920 | if (ret == Z_STREAM_END) |
| 921 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 922 | } |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 923 | |
| 924 | /* All the data should have been processed, if anything |
| 925 | * is left at this point we have bytes of IDAT data |
| 926 | * after the zlib end code. |
| 927 | */ |
| 928 | if (png_ptr->zstream.avail_in > 0) |
| 929 | png_warning(png_ptr, "Extra compression data"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 930 | } |
| 931 | |
| 932 | void /* PRIVATE */ |
| 933 | png_push_process_row(png_structp png_ptr) |
| 934 | { |
| 935 | png_ptr->row_info.color_type = png_ptr->color_type; |
| 936 | png_ptr->row_info.width = png_ptr->iwidth; |
| 937 | png_ptr->row_info.channels = png_ptr->channels; |
| 938 | png_ptr->row_info.bit_depth = png_ptr->bit_depth; |
| 939 | png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; |
| 940 | |
| 941 | png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, |
| 942 | png_ptr->row_info.width); |
| 943 | |
| 944 | png_read_filter_row(png_ptr, &(png_ptr->row_info), |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 945 | png_ptr->row_buf + 1, png_ptr->prev_row + 1, |
| 946 | (int)(png_ptr->row_buf[0])); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 947 | |
| 948 | png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf, |
| 949 | png_ptr->rowbytes + 1); |
| 950 | |
| 951 | if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) |
| 952 | png_do_read_transformations(png_ptr); |
| 953 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 954 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 955 | /* Blow up interlaced rows to full size */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 956 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) |
| 957 | { |
| 958 | if (png_ptr->pass < 6) |
| 959 | /* old interface (pre-1.0.9): |
| 960 | png_do_read_interlace(&(png_ptr->row_info), |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 961 | png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 962 | */ |
| 963 | png_do_read_interlace(png_ptr); |
| 964 | |
| 965 | switch (png_ptr->pass) |
| 966 | { |
| 967 | case 0: |
| 968 | { |
| 969 | int i; |
| 970 | for (i = 0; i < 8 && png_ptr->pass == 0; i++) |
| 971 | { |
| 972 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 973 | 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] | 974 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 975 | |
| 976 | 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] | 977 | { |
| 978 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 979 | { |
| 980 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 981 | png_read_push_finish_row(png_ptr); |
| 982 | } |
| 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 | if (png_ptr->pass == 4 && png_ptr->height <= 4) |
| 986 | { |
| 987 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 988 | { |
| 989 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 990 | png_read_push_finish_row(png_ptr); |
| 991 | } |
| 992 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 993 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 994 | if (png_ptr->pass == 6 && png_ptr->height <= 4) |
| 995 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 996 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 997 | png_read_push_finish_row(png_ptr); |
| 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 1: |
| 1004 | { |
| 1005 | int i; |
| 1006 | for (i = 0; i < 8 && png_ptr->pass == 1; i++) |
| 1007 | { |
| 1008 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1009 | png_read_push_finish_row(png_ptr); |
| 1010 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1011 | |
| 1012 | 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] | 1013 | { |
| 1014 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 1015 | { |
| 1016 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1017 | png_read_push_finish_row(png_ptr); |
| 1018 | } |
| 1019 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1020 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1021 | break; |
| 1022 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1023 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1024 | case 2: |
| 1025 | { |
| 1026 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1027 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1028 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 1029 | { |
| 1030 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1031 | png_read_push_finish_row(png_ptr); |
| 1032 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1033 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1034 | for (i = 0; i < 4 && png_ptr->pass == 2; i++) |
| 1035 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1036 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1037 | png_read_push_finish_row(png_ptr); |
| 1038 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1039 | |
| 1040 | 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] | 1041 | { |
| 1042 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1043 | { |
| 1044 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1045 | png_read_push_finish_row(png_ptr); |
| 1046 | } |
| 1047 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1048 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1049 | break; |
| 1050 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1051 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1052 | case 3: |
| 1053 | { |
| 1054 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1055 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1056 | for (i = 0; i < 4 && png_ptr->pass == 3; i++) |
| 1057 | { |
| 1058 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1059 | png_read_push_finish_row(png_ptr); |
| 1060 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1061 | |
| 1062 | 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] | 1063 | { |
| 1064 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1065 | { |
| 1066 | png_push_have_row(png_ptr, png_bytep_NULL); |
| 1067 | png_read_push_finish_row(png_ptr); |
| 1068 | } |
| 1069 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1070 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1071 | break; |
| 1072 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1073 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1074 | case 4: |
| 1075 | { |
| 1076 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1077 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1078 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1079 | { |
| 1080 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1081 | png_read_push_finish_row(png_ptr); |
| 1082 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1083 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1084 | for (i = 0; i < 2 && png_ptr->pass == 4; i++) |
| 1085 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1086 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1087 | png_read_push_finish_row(png_ptr); |
| 1088 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1089 | |
| 1090 | 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] | 1091 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1092 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1093 | png_read_push_finish_row(png_ptr); |
| 1094 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1095 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1096 | break; |
| 1097 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1098 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1099 | case 5: |
| 1100 | { |
| 1101 | int i; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1102 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1103 | for (i = 0; i < 2 && png_ptr->pass == 5; i++) |
| 1104 | { |
| 1105 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1106 | png_read_push_finish_row(png_ptr); |
| 1107 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1108 | |
| 1109 | if (png_ptr->pass == 6) /* Skip top generated row */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1110 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1111 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1112 | png_read_push_finish_row(png_ptr); |
| 1113 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1114 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1115 | break; |
| 1116 | } |
| 1117 | case 6: |
| 1118 | { |
| 1119 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1120 | png_read_push_finish_row(png_ptr); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1121 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1122 | if (png_ptr->pass != 6) |
| 1123 | break; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1124 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1125 | png_push_have_row(png_ptr, png_bytep_NULL); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1126 | png_read_push_finish_row(png_ptr); |
| 1127 | } |
| 1128 | } |
| 1129 | } |
| 1130 | else |
| 1131 | #endif |
| 1132 | { |
| 1133 | png_push_have_row(png_ptr, png_ptr->row_buf + 1); |
| 1134 | png_read_push_finish_row(png_ptr); |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | void /* PRIVATE */ |
| 1139 | png_read_push_finish_row(png_structp png_ptr) |
| 1140 | { |
| 1141 | #ifdef PNG_USE_LOCAL_ARRAYS |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1142 | /* 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] | 1143 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1144 | /* Start of interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1145 | PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; |
| 1146 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1147 | /* Offset to next interlace block */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1148 | PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1149 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1150 | /* Start of interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1151 | PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; |
| 1152 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1153 | /* Offset to next interlace block in the y direction */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1154 | PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; |
| 1155 | |
| 1156 | /* Height of interlace block. This is not currently used - if you need |
| 1157 | * it, uncomment it here and in png.h |
| 1158 | PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; |
| 1159 | */ |
| 1160 | #endif |
| 1161 | |
| 1162 | png_ptr->row_number++; |
| 1163 | if (png_ptr->row_number < png_ptr->num_rows) |
| 1164 | return; |
| 1165 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1166 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1167 | if (png_ptr->interlaced) |
| 1168 | { |
| 1169 | png_ptr->row_number = 0; |
| 1170 | png_memset_check(png_ptr, png_ptr->prev_row, 0, |
| 1171 | png_ptr->rowbytes + 1); |
| 1172 | do |
| 1173 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1174 | png_ptr->pass++; |
| 1175 | if ((png_ptr->pass == 1 && png_ptr->width < 5) || |
| 1176 | (png_ptr->pass == 3 && png_ptr->width < 3) || |
| 1177 | (png_ptr->pass == 5 && png_ptr->width < 2)) |
| 1178 | png_ptr->pass++; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1179 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1180 | if (png_ptr->pass > 7) |
| 1181 | png_ptr->pass--; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1182 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1183 | if (png_ptr->pass >= 7) |
| 1184 | break; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1185 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1186 | png_ptr->iwidth = (png_ptr->width + |
| 1187 | png_pass_inc[png_ptr->pass] - 1 - |
| 1188 | png_pass_start[png_ptr->pass]) / |
| 1189 | png_pass_inc[png_ptr->pass]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1190 | |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1191 | if (png_ptr->transformations & PNG_INTERLACE) |
| 1192 | break; |
| 1193 | |
| 1194 | png_ptr->num_rows = (png_ptr->height + |
| 1195 | png_pass_yinc[png_ptr->pass] - 1 - |
| 1196 | png_pass_ystart[png_ptr->pass]) / |
| 1197 | png_pass_yinc[png_ptr->pass]; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1198 | |
| 1199 | } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); |
| 1200 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1201 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1202 | } |
| 1203 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1204 | #ifdef PNG_READ_tEXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1205 | void /* PRIVATE */ |
| 1206 | png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1207 | length) |
| 1208 | { |
| 1209 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1210 | { |
| 1211 | png_error(png_ptr, "Out of place tEXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1212 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | #ifdef PNG_MAX_MALLOC_64K |
| 1216 | png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1217 | |
| 1218 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1219 | { |
| 1220 | png_warning(png_ptr, "tEXt chunk too large to fit in memory"); |
| 1221 | png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1222 | length = (png_uint_32)65535L; |
| 1223 | } |
| 1224 | #endif |
| 1225 | |
| 1226 | 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] | 1227 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1228 | png_ptr->current_text[length] = '\0'; |
| 1229 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1230 | png_ptr->current_text_size = (png_size_t)length; |
| 1231 | png_ptr->current_text_left = (png_size_t)length; |
| 1232 | png_ptr->process_mode = PNG_READ_tEXt_MODE; |
| 1233 | } |
| 1234 | |
| 1235 | void /* PRIVATE */ |
| 1236 | png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) |
| 1237 | { |
| 1238 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1239 | { |
| 1240 | png_size_t text_size; |
| 1241 | |
| 1242 | if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1243 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1244 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1245 | else |
| 1246 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1247 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1248 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1249 | png_ptr->current_text_left -= text_size; |
| 1250 | png_ptr->current_text_ptr += text_size; |
| 1251 | } |
| 1252 | if (!(png_ptr->current_text_left)) |
| 1253 | { |
| 1254 | png_textp text_ptr; |
| 1255 | png_charp text; |
| 1256 | png_charp key; |
| 1257 | int ret; |
| 1258 | |
| 1259 | if (png_ptr->buffer_size < 4) |
| 1260 | { |
| 1261 | png_push_save_buffer(png_ptr); |
| 1262 | return; |
| 1263 | } |
| 1264 | |
| 1265 | png_push_crc_finish(png_ptr); |
| 1266 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1267 | #ifdef PNG_MAX_MALLOC_64K |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1268 | if (png_ptr->skip_length) |
| 1269 | return; |
| 1270 | #endif |
| 1271 | |
| 1272 | key = png_ptr->current_text; |
| 1273 | |
| 1274 | for (text = key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1275 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1276 | |
| 1277 | if (text < key + png_ptr->current_text_size) |
| 1278 | text++; |
| 1279 | |
| 1280 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1281 | (png_uint_32)png_sizeof(png_text)); |
| 1282 | text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; |
| 1283 | text_ptr->key = key; |
| 1284 | #ifdef PNG_iTXt_SUPPORTED |
| 1285 | text_ptr->lang = NULL; |
| 1286 | text_ptr->lang_key = NULL; |
| 1287 | #endif |
| 1288 | text_ptr->text = text; |
| 1289 | |
| 1290 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1291 | |
| 1292 | png_free(png_ptr, key); |
| 1293 | png_free(png_ptr, text_ptr); |
| 1294 | png_ptr->current_text = NULL; |
| 1295 | |
| 1296 | if (ret) |
| 1297 | png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1298 | } |
| 1299 | } |
| 1300 | #endif |
| 1301 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1302 | #ifdef PNG_READ_zTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1303 | void /* PRIVATE */ |
| 1304 | png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1305 | length) |
| 1306 | { |
| 1307 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1308 | { |
| 1309 | png_error(png_ptr, "Out of place zTXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1310 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1311 | } |
| 1312 | |
| 1313 | #ifdef PNG_MAX_MALLOC_64K |
| 1314 | /* We can't handle zTXt chunks > 64K, since we don't have enough space |
| 1315 | * to be able to store the uncompressed data. Actually, the threshold |
| 1316 | * is probably around 32K, but it isn't as definite as 64K is. |
| 1317 | */ |
| 1318 | if (length > (png_uint_32)65535L) |
| 1319 | { |
| 1320 | png_warning(png_ptr, "zTXt chunk too large to fit in memory"); |
| 1321 | png_push_crc_skip(png_ptr, length); |
| 1322 | return; |
| 1323 | } |
| 1324 | #endif |
| 1325 | |
| 1326 | 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] | 1327 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1328 | png_ptr->current_text[length] = '\0'; |
| 1329 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1330 | png_ptr->current_text_size = (png_size_t)length; |
| 1331 | png_ptr->current_text_left = (png_size_t)length; |
| 1332 | png_ptr->process_mode = PNG_READ_zTXt_MODE; |
| 1333 | } |
| 1334 | |
| 1335 | void /* PRIVATE */ |
| 1336 | png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) |
| 1337 | { |
| 1338 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1339 | { |
| 1340 | png_size_t text_size; |
| 1341 | |
| 1342 | if (png_ptr->buffer_size < (png_uint_32)png_ptr->current_text_left) |
| 1343 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1344 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1345 | else |
| 1346 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1347 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1348 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1349 | png_ptr->current_text_left -= text_size; |
| 1350 | png_ptr->current_text_ptr += text_size; |
| 1351 | } |
| 1352 | if (!(png_ptr->current_text_left)) |
| 1353 | { |
| 1354 | png_textp text_ptr; |
| 1355 | png_charp text; |
| 1356 | png_charp key; |
| 1357 | int ret; |
| 1358 | png_size_t text_size, key_size; |
| 1359 | |
| 1360 | if (png_ptr->buffer_size < 4) |
| 1361 | { |
| 1362 | png_push_save_buffer(png_ptr); |
| 1363 | return; |
| 1364 | } |
| 1365 | |
| 1366 | png_push_crc_finish(png_ptr); |
| 1367 | |
| 1368 | key = png_ptr->current_text; |
| 1369 | |
| 1370 | for (text = key; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1371 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1372 | |
| 1373 | /* zTXt can't have zero text */ |
| 1374 | if (text >= key + png_ptr->current_text_size) |
| 1375 | { |
| 1376 | png_ptr->current_text = NULL; |
| 1377 | png_free(png_ptr, key); |
| 1378 | return; |
| 1379 | } |
| 1380 | |
| 1381 | text++; |
| 1382 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1383 | if (*text != PNG_TEXT_COMPRESSION_zTXt) /* Check compression byte */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1384 | { |
| 1385 | png_ptr->current_text = NULL; |
| 1386 | png_free(png_ptr, key); |
| 1387 | return; |
| 1388 | } |
| 1389 | |
| 1390 | text++; |
| 1391 | |
| 1392 | png_ptr->zstream.next_in = (png_bytep )text; |
| 1393 | png_ptr->zstream.avail_in = (uInt)(png_ptr->current_text_size - |
| 1394 | (text - key)); |
| 1395 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1396 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1397 | |
| 1398 | key_size = text - key; |
| 1399 | text_size = 0; |
| 1400 | text = NULL; |
| 1401 | ret = Z_STREAM_END; |
| 1402 | |
| 1403 | while (png_ptr->zstream.avail_in) |
| 1404 | { |
| 1405 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); |
| 1406 | if (ret != Z_OK && ret != Z_STREAM_END) |
| 1407 | { |
| 1408 | inflateReset(&png_ptr->zstream); |
| 1409 | png_ptr->zstream.avail_in = 0; |
| 1410 | png_ptr->current_text = NULL; |
| 1411 | png_free(png_ptr, key); |
| 1412 | png_free(png_ptr, text); |
| 1413 | return; |
| 1414 | } |
| 1415 | if (!(png_ptr->zstream.avail_out) || ret == Z_STREAM_END) |
| 1416 | { |
| 1417 | if (text == NULL) |
| 1418 | { |
| 1419 | text = (png_charp)png_malloc(png_ptr, |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1420 | (png_uint_32)(png_ptr->zbuf_size |
| 1421 | - png_ptr->zstream.avail_out + key_size + 1)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1422 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1423 | png_memcpy(text + key_size, png_ptr->zbuf, |
| 1424 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1425 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1426 | png_memcpy(text, key, key_size); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1427 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1428 | text_size = key_size + png_ptr->zbuf_size - |
| 1429 | png_ptr->zstream.avail_out; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1430 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1431 | *(text + text_size) = '\0'; |
| 1432 | } |
| 1433 | else |
| 1434 | { |
| 1435 | png_charp tmp; |
| 1436 | |
| 1437 | tmp = text; |
| 1438 | text = (png_charp)png_malloc(png_ptr, text_size + |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1439 | (png_uint_32)(png_ptr->zbuf_size |
| 1440 | - png_ptr->zstream.avail_out + 1)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1441 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1442 | png_memcpy(text, tmp, text_size); |
| 1443 | png_free(png_ptr, tmp); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1444 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1445 | png_memcpy(text + text_size, png_ptr->zbuf, |
| 1446 | png_ptr->zbuf_size - png_ptr->zstream.avail_out); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1447 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1448 | text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out; |
| 1449 | *(text + text_size) = '\0'; |
| 1450 | } |
| 1451 | if (ret != Z_STREAM_END) |
| 1452 | { |
| 1453 | png_ptr->zstream.next_out = png_ptr->zbuf; |
| 1454 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; |
| 1455 | } |
| 1456 | } |
| 1457 | else |
| 1458 | { |
| 1459 | break; |
| 1460 | } |
| 1461 | |
| 1462 | if (ret == Z_STREAM_END) |
| 1463 | break; |
| 1464 | } |
| 1465 | |
| 1466 | inflateReset(&png_ptr->zstream); |
| 1467 | png_ptr->zstream.avail_in = 0; |
| 1468 | |
| 1469 | if (ret != Z_STREAM_END) |
| 1470 | { |
| 1471 | png_ptr->current_text = NULL; |
| 1472 | png_free(png_ptr, key); |
| 1473 | png_free(png_ptr, text); |
| 1474 | return; |
| 1475 | } |
| 1476 | |
| 1477 | png_ptr->current_text = NULL; |
| 1478 | png_free(png_ptr, key); |
| 1479 | key = text; |
| 1480 | text += key_size; |
| 1481 | |
| 1482 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1483 | (png_uint_32)png_sizeof(png_text)); |
| 1484 | text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt; |
| 1485 | text_ptr->key = key; |
| 1486 | #ifdef PNG_iTXt_SUPPORTED |
| 1487 | text_ptr->lang = NULL; |
| 1488 | text_ptr->lang_key = NULL; |
| 1489 | #endif |
| 1490 | text_ptr->text = text; |
| 1491 | |
| 1492 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1493 | |
| 1494 | png_free(png_ptr, key); |
| 1495 | png_free(png_ptr, text_ptr); |
| 1496 | |
| 1497 | if (ret) |
| 1498 | png_warning(png_ptr, "Insufficient memory to store text chunk."); |
| 1499 | } |
| 1500 | } |
| 1501 | #endif |
| 1502 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1503 | #ifdef PNG_READ_iTXt_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1504 | void /* PRIVATE */ |
| 1505 | png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1506 | length) |
| 1507 | { |
| 1508 | if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) |
| 1509 | { |
| 1510 | png_error(png_ptr, "Out of place iTXt"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1511 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1512 | } |
| 1513 | |
| 1514 | #ifdef PNG_MAX_MALLOC_64K |
| 1515 | png_ptr->skip_length = 0; /* This may not be necessary */ |
| 1516 | |
| 1517 | if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */ |
| 1518 | { |
| 1519 | png_warning(png_ptr, "iTXt chunk too large to fit in memory"); |
| 1520 | png_ptr->skip_length = length - (png_uint_32)65535L; |
| 1521 | length = (png_uint_32)65535L; |
| 1522 | } |
| 1523 | #endif |
| 1524 | |
| 1525 | 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] | 1526 | (png_uint_32)(length + 1)); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1527 | png_ptr->current_text[length] = '\0'; |
| 1528 | png_ptr->current_text_ptr = png_ptr->current_text; |
| 1529 | png_ptr->current_text_size = (png_size_t)length; |
| 1530 | png_ptr->current_text_left = (png_size_t)length; |
| 1531 | png_ptr->process_mode = PNG_READ_iTXt_MODE; |
| 1532 | } |
| 1533 | |
| 1534 | void /* PRIVATE */ |
| 1535 | png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) |
| 1536 | { |
| 1537 | |
| 1538 | if (png_ptr->buffer_size && png_ptr->current_text_left) |
| 1539 | { |
| 1540 | png_size_t text_size; |
| 1541 | |
| 1542 | if (png_ptr->buffer_size < png_ptr->current_text_left) |
| 1543 | text_size = png_ptr->buffer_size; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1544 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1545 | else |
| 1546 | text_size = png_ptr->current_text_left; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1547 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1548 | png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size); |
| 1549 | png_ptr->current_text_left -= text_size; |
| 1550 | png_ptr->current_text_ptr += text_size; |
| 1551 | } |
| 1552 | if (!(png_ptr->current_text_left)) |
| 1553 | { |
| 1554 | png_textp text_ptr; |
| 1555 | png_charp key; |
| 1556 | int comp_flag; |
| 1557 | png_charp lang; |
| 1558 | png_charp lang_key; |
| 1559 | png_charp text; |
| 1560 | int ret; |
| 1561 | |
| 1562 | if (png_ptr->buffer_size < 4) |
| 1563 | { |
| 1564 | png_push_save_buffer(png_ptr); |
| 1565 | return; |
| 1566 | } |
| 1567 | |
| 1568 | png_push_crc_finish(png_ptr); |
| 1569 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1570 | #ifdef PNG_MAX_MALLOC_64K |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1571 | if (png_ptr->skip_length) |
| 1572 | return; |
| 1573 | #endif |
| 1574 | |
| 1575 | key = png_ptr->current_text; |
| 1576 | |
| 1577 | for (lang = key; *lang; lang++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1578 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1579 | |
| 1580 | if (lang < key + png_ptr->current_text_size - 3) |
| 1581 | lang++; |
| 1582 | |
| 1583 | comp_flag = *lang++; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1584 | lang++; /* Skip comp_type, always zero */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1585 | |
| 1586 | for (lang_key = lang; *lang_key; lang_key++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1587 | /* Empty loop */ ; |
| 1588 | |
| 1589 | lang_key++; /* Skip NUL separator */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1590 | |
| 1591 | text=lang_key; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1592 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1593 | if (lang_key < key + png_ptr->current_text_size - 1) |
| 1594 | { |
| 1595 | for (; *text; text++) |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1596 | /* Empty loop */ ; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1597 | } |
| 1598 | |
| 1599 | if (text < key + png_ptr->current_text_size) |
| 1600 | text++; |
| 1601 | |
| 1602 | text_ptr = (png_textp)png_malloc(png_ptr, |
| 1603 | (png_uint_32)png_sizeof(png_text)); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1604 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1605 | text_ptr->compression = comp_flag + 2; |
| 1606 | text_ptr->key = key; |
| 1607 | text_ptr->lang = lang; |
| 1608 | text_ptr->lang_key = lang_key; |
| 1609 | text_ptr->text = text; |
| 1610 | text_ptr->text_length = 0; |
| 1611 | text_ptr->itxt_length = png_strlen(text); |
| 1612 | |
| 1613 | ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); |
| 1614 | |
| 1615 | png_ptr->current_text = NULL; |
| 1616 | |
| 1617 | png_free(png_ptr, text_ptr); |
| 1618 | if (ret) |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1619 | png_warning(png_ptr, "Insufficient memory to store iTXt chunk."); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1620 | } |
| 1621 | } |
| 1622 | #endif |
| 1623 | |
| 1624 | /* This function is called when we haven't found a handler for this |
| 1625 | * chunk. If there isn't a problem with the chunk itself (ie a bad chunk |
| 1626 | * name or a critical chunk), the chunk is (currently) silently ignored. |
| 1627 | */ |
| 1628 | void /* PRIVATE */ |
| 1629 | png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 |
| 1630 | length) |
| 1631 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1632 | png_uint_32 skip = 0; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1633 | |
| 1634 | if (!(png_ptr->chunk_name[0] & 0x20)) |
| 1635 | { |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1636 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1637 | if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != |
| 1638 | PNG_HANDLE_CHUNK_ALWAYS |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1639 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1640 | && png_ptr->read_user_chunk_fn == NULL |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1641 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1642 | ) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1643 | #endif |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1644 | png_chunk_error(png_ptr, "unknown critical chunk"); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1645 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1646 | info_ptr = info_ptr; /* To quiet some compiler warnings */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1647 | } |
| 1648 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1649 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1650 | if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) |
| 1651 | { |
| 1652 | #ifdef PNG_MAX_MALLOC_64K |
| 1653 | if (length > (png_uint_32)65535L) |
| 1654 | { |
| 1655 | png_warning(png_ptr, "unknown chunk too large to fit in memory"); |
| 1656 | skip = length - (png_uint_32)65535L; |
| 1657 | length = (png_uint_32)65535L; |
| 1658 | } |
| 1659 | #endif |
| 1660 | png_memcpy((png_charp)png_ptr->unknown_chunk.name, |
| 1661 | (png_charp)png_ptr->chunk_name, |
| 1662 | png_sizeof(png_ptr->unknown_chunk.name)); |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1663 | png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name) - 1] |
| 1664 | = '\0'; |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1665 | |
| 1666 | png_ptr->unknown_chunk.size = (png_size_t)length; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1667 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1668 | if (length == 0) |
| 1669 | png_ptr->unknown_chunk.data = NULL; |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1670 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1671 | else |
| 1672 | { |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1673 | png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1674 | (png_uint_32)length); |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1675 | png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); |
| 1676 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1677 | |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1678 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1679 | if (png_ptr->read_user_chunk_fn != NULL) |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1680 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1681 | /* Callback to user unknown chunk handler */ |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1682 | int ret; |
| 1683 | ret = (*(png_ptr->read_user_chunk_fn)) |
| 1684 | (png_ptr, &png_ptr->unknown_chunk); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1685 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1686 | if (ret < 0) |
| 1687 | png_chunk_error(png_ptr, "error in user chunk"); |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1688 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1689 | if (ret == 0) |
| 1690 | { |
| 1691 | if (!(png_ptr->chunk_name[0] & 0x20)) |
The Android Open Source Project | 4215dd1 | 2009-03-09 11:52:12 -0700 | [diff] [blame] | 1692 | 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] | 1693 | PNG_HANDLE_CHUNK_ALWAYS) |
| 1694 | png_chunk_error(png_ptr, "unknown critical chunk"); |
| 1695 | png_set_unknown_chunks(png_ptr, info_ptr, |
| 1696 | &png_ptr->unknown_chunk, 1); |
| 1697 | } |
| 1698 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1699 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1700 | else |
| 1701 | #endif |
| 1702 | png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); |
| 1703 | png_free(png_ptr, png_ptr->unknown_chunk.data); |
| 1704 | png_ptr->unknown_chunk.data = NULL; |
| 1705 | } |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1706 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1707 | else |
| 1708 | #endif |
| 1709 | skip=length; |
| 1710 | png_push_crc_skip(png_ptr, skip); |
| 1711 | } |
| 1712 | |
| 1713 | void /* PRIVATE */ |
| 1714 | png_push_have_info(png_structp png_ptr, png_infop info_ptr) |
| 1715 | { |
| 1716 | if (png_ptr->info_fn != NULL) |
| 1717 | (*(png_ptr->info_fn))(png_ptr, info_ptr); |
| 1718 | } |
| 1719 | |
| 1720 | void /* PRIVATE */ |
| 1721 | png_push_have_end(png_structp png_ptr, png_infop info_ptr) |
| 1722 | { |
| 1723 | if (png_ptr->end_fn != NULL) |
| 1724 | (*(png_ptr->end_fn))(png_ptr, info_ptr); |
| 1725 | } |
| 1726 | |
| 1727 | void /* PRIVATE */ |
| 1728 | png_push_have_row(png_structp png_ptr, png_bytep row) |
| 1729 | { |
| 1730 | if (png_ptr->row_fn != NULL) |
| 1731 | (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, |
| 1732 | (int)png_ptr->pass); |
| 1733 | } |
| 1734 | |
| 1735 | void PNGAPI |
| 1736 | png_progressive_combine_row (png_structp png_ptr, |
| 1737 | png_bytep old_row, png_bytep new_row) |
| 1738 | { |
| 1739 | #ifdef PNG_USE_LOCAL_ARRAYS |
| 1740 | PNG_CONST int FARDATA png_pass_dsp_mask[7] = |
| 1741 | {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| 1742 | #endif |
Patrick Scott | 5f6bd84 | 2010-06-28 16:55:16 -0400 | [diff] [blame] | 1743 | |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1744 | if (png_ptr == NULL) |
| 1745 | return; |
| 1746 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1747 | if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ |
| 1748 | png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); |
| 1749 | } |
| 1750 | |
| 1751 | void PNGAPI |
| 1752 | png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, |
| 1753 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1754 | png_progressive_end_ptr end_fn) |
| 1755 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1756 | if (png_ptr == NULL) |
| 1757 | return; |
| 1758 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1759 | png_ptr->info_fn = info_fn; |
| 1760 | png_ptr->row_fn = row_fn; |
| 1761 | png_ptr->end_fn = end_fn; |
| 1762 | |
| 1763 | png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); |
| 1764 | } |
| 1765 | |
| 1766 | png_voidp PNGAPI |
| 1767 | png_get_progressive_ptr(png_structp png_ptr) |
| 1768 | { |
Patrick Scott | a0bb96c | 2009-07-22 11:50:02 -0400 | [diff] [blame] | 1769 | if (png_ptr == NULL) |
| 1770 | return (NULL); |
| 1771 | |
The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1772 | return png_ptr->io_ptr; |
| 1773 | } |
| 1774 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |