16 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
19 #define PNG_READ_SIG_MODE 0
20 #define PNG_READ_CHUNK_MODE 1
21 #define PNG_READ_IDAT_MODE 2
22 #define PNG_SKIP_MODE 3
23 #define PNG_READ_tEXt_MODE 4
24 #define PNG_READ_zTXt_MODE 5
25 #define PNG_READ_DONE_MODE 6
26 #define PNG_READ_iTXt_MODE 7
27 #define PNG_ERROR_MODE 8
33 if (png_ptr ==
NULL || info_ptr ==
NULL)
38 while (png_ptr->buffer_size)
58 png_ptr->buffer_size = 0;
63 if (png_ptr->save_buffer_size < remaining)
64 return remaining - png_ptr->save_buffer_size;
77 png_ptr->skip_length > 0)
82 if (png_ptr->buffer_size != 0)
84 "png_process_data_skip called inside png_process_data");
91 if (png_ptr->save_buffer_size != 0)
92 png_error(png_ptr,
"png_process_data_skip called with saved data");
94 remaining = png_ptr->skip_length;
95 png_ptr->skip_length = 0;
111 switch (png_ptr->process_mode)
131 #ifdef PNG_READ_tEXt_SUPPORTED
139 #ifdef PNG_READ_zTXt_SUPPORTED
147 #ifdef PNG_READ_iTXt_SUPPORTED
163 png_ptr->buffer_size = 0;
179 num_to_check = 8 - num_checked;
181 if (png_ptr->buffer_size < num_to_check)
183 num_to_check = png_ptr->buffer_size;
188 png_ptr->sig_bytes = (
png_byte)(png_ptr->sig_bytes + num_to_check);
190 if (
png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
192 if (num_checked < 4 &&
193 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
197 png_error(png_ptr,
"PNG file corrupted by ASCII conversion");
201 if (png_ptr->sig_bytes >= 8)
224 if (png_ptr->buffer_size < 8)
239 chunk_name = png_ptr->chunk_name;
255 if (png_ptr->push_length != 13)
256 png_error(png_ptr,
"Invalid IHDR length");
258 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
269 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
281 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
284 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
301 png_error(png_ptr,
"Missing IHDR before IDAT");
305 png_error(png_ptr,
"Missing PLTE before IDAT");
312 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
328 png_error(png_ptr,
"Missing IHDR before IDAT");
332 png_error(png_ptr,
"Missing PLTE before IDAT");
337 if (png_ptr->push_length == 0)
344 png_ptr->idat_size = png_ptr->push_length;
348 png_ptr->zstream.avail_out =
350 png_ptr->iwidth) + 1;
351 png_ptr->zstream.next_out = png_ptr->row_buf;
355 #ifdef PNG_READ_gAMA_SUPPORTED
356 else if (png_ptr->chunk_name ==
png_gAMA)
358 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
368 #ifdef PNG_READ_sBIT_SUPPORTED
369 else if (png_ptr->chunk_name ==
png_sBIT)
371 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
381 #ifdef PNG_READ_cHRM_SUPPORTED
382 else if (png_ptr->chunk_name ==
png_cHRM)
384 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
394 #ifdef PNG_READ_sRGB_SUPPORTED
397 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
407 #ifdef PNG_READ_iCCP_SUPPORTED
408 else if (png_ptr->chunk_name ==
png_iCCP)
410 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
416 png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
420 #ifdef PNG_READ_sPLT_SUPPORTED
423 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
429 png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
433 #ifdef PNG_READ_tRNS_SUPPORTED
436 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
446 #ifdef PNG_READ_bKGD_SUPPORTED
449 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
459 #ifdef PNG_READ_hIST_SUPPORTED
462 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
472 #ifdef PNG_READ_pHYs_SUPPORTED
475 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
485 #ifdef PNG_READ_oFFs_SUPPORTED
488 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
498 #ifdef PNG_READ_pCAL_SUPPORTED
501 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
511 #ifdef PNG_READ_sCAL_SUPPORTED
514 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
524 #ifdef PNG_READ_tIME_SUPPORTED
527 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
537 #ifdef PNG_READ_tEXt_SUPPORTED
540 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
550 #ifdef PNG_READ_zTXt_SUPPORTED
553 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
563 #ifdef PNG_READ_iTXt_SUPPORTED
566 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
578 if (png_ptr->push_length + 4 > png_ptr->buffer_size)
593 png_ptr->skip_length =
skip;
599 if (png_ptr->skip_length && png_ptr->save_buffer_size)
601 png_size_t save_size = png_ptr->save_buffer_size;
610 if (skip_length < save_size)
618 png_ptr->skip_length -= skip_length;
619 png_ptr->buffer_size -= save_size;
620 png_ptr->save_buffer_size -= save_size;
621 png_ptr->save_buffer_ptr += save_size;
623 if (png_ptr->skip_length && png_ptr->current_buffer_size)
625 png_size_t save_size = png_ptr->current_buffer_size;
631 if (skip_length < save_size)
639 png_ptr->skip_length -= skip_length;
640 png_ptr->buffer_size -= save_size;
641 png_ptr->current_buffer_size -= save_size;
642 png_ptr->current_buffer_ptr += save_size;
644 if (!png_ptr->skip_length)
646 if (png_ptr->buffer_size < 4)
666 if (png_ptr->save_buffer_size)
674 save_size = png_ptr->save_buffer_size;
676 png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size);
679 png_ptr->buffer_size -= save_size;
680 png_ptr->save_buffer_size -= save_size;
681 png_ptr->save_buffer_ptr += save_size;
683 if (length && png_ptr->current_buffer_size)
691 save_size = png_ptr->current_buffer_size;
693 png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size);
694 png_ptr->buffer_size -= save_size;
695 png_ptr->current_buffer_size -= save_size;
696 png_ptr->current_buffer_ptr += save_size;
703 if (png_ptr->save_buffer_size)
705 if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
711 istop = png_ptr->save_buffer_size;
712 for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
713 i < istop; i++, sp++, dp++)
719 if (png_ptr->save_buffer_size + png_ptr->current_buffer_size >
720 png_ptr->save_buffer_max)
726 (png_ptr->current_buffer_size + 256))
728 png_error(png_ptr,
"Potential overflow of save_buffer");
731 new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256;
732 old_buffer = png_ptr->save_buffer;
733 png_ptr->save_buffer = (
png_bytep)png_malloc_warn(png_ptr, new_max);
735 if (png_ptr->save_buffer ==
NULL)
738 png_error(png_ptr,
"Insufficient memory for save_buffer");
741 png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size);
743 png_ptr->save_buffer_max = new_max;
745 if (png_ptr->current_buffer_size)
747 png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size,
748 png_ptr->current_buffer_ptr, png_ptr->current_buffer_size);
749 png_ptr->save_buffer_size += png_ptr->current_buffer_size;
750 png_ptr->current_buffer_size = 0;
752 png_ptr->save_buffer_ptr = png_ptr->save_buffer;
753 png_ptr->buffer_size = 0;
760 png_ptr->current_buffer =
buffer;
761 png_ptr->current_buffer_size = buffer_length;
762 png_ptr->buffer_size = buffer_length + png_ptr->save_buffer_size;
763 png_ptr->current_buffer_ptr = png_ptr->current_buffer;
775 if (png_ptr->buffer_size < 8)
788 if (png_ptr->chunk_name !=
png_IDAT)
793 png_error(png_ptr,
"Not enough compressed data");
798 png_ptr->idat_size = png_ptr->push_length;
801 if (png_ptr->idat_size && png_ptr->save_buffer_size)
803 png_size_t save_size = png_ptr->save_buffer_size;
812 if (idat_size < save_size)
822 png_ptr->idat_size -= idat_size;
823 png_ptr->buffer_size -= save_size;
824 png_ptr->save_buffer_size -= save_size;
825 png_ptr->save_buffer_ptr += save_size;
828 if (png_ptr->idat_size && png_ptr->current_buffer_size)
830 png_size_t save_size = png_ptr->current_buffer_size;
838 if (idat_size < save_size)
848 png_ptr->idat_size -= idat_size;
849 png_ptr->buffer_size -= save_size;
850 png_ptr->current_buffer_size -= save_size;
851 png_ptr->current_buffer_ptr += save_size;
853 if (!png_ptr->idat_size)
855 if (png_ptr->buffer_size < 4)
872 if (!(buffer_length > 0) || buffer ==
NULL)
873 png_error(png_ptr,
"No IDAT data (internal error)");
879 png_ptr->zstream.next_in =
buffer;
880 png_ptr->zstream.avail_in = (
uInt)buffer_length;
885 while (png_ptr->zstream.avail_in > 0 &&
895 if (!(png_ptr->zstream.avail_out > 0))
897 png_ptr->zstream.avail_out =
899 png_ptr->iwidth) + 1;
901 png_ptr->zstream.next_out = png_ptr->row_buf;
922 if (png_ptr->row_number >= png_ptr->num_rows ||
924 png_warning(png_ptr,
"Truncated compressed data in IDAT");
927 png_error(png_ptr,
"Decompression error in IDAT");
934 if (png_ptr->zstream.next_out != png_ptr->row_buf)
940 if (png_ptr->row_number >= png_ptr->num_rows ||
944 png_warning(png_ptr,
"Extra compressed data in IDAT");
954 if (png_ptr->zstream.avail_out == 0)
967 if (png_ptr->zstream.avail_in > 0)
968 png_warning(png_ptr,
"Extra compression data in IDAT");
977 row_info.
width = png_ptr->iwidth;
980 row_info.
channels = png_ptr->channels;
988 png_ptr->prev_row + 1, png_ptr->row_buf[0]);
990 png_error(png_ptr,
"bad adaptive filter value");
1000 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1001 if (png_ptr->transformations)
1006 if (png_ptr->transformed_pixel_depth == 0)
1008 png_ptr->transformed_pixel_depth = row_info.
pixel_depth;
1009 if (row_info.
pixel_depth > png_ptr->maximum_pixel_depth)
1010 png_error(png_ptr,
"progressive row overflow");
1013 else if (png_ptr->transformed_pixel_depth != row_info.
pixel_depth)
1014 png_error(png_ptr,
"internal progressive row size calculation error");
1017 #ifdef PNG_READ_INTERLACING_SUPPORTED
1019 if (png_ptr->interlaced && (png_ptr->transformations &
PNG_INTERLACE))
1021 if (png_ptr->pass < 6)
1023 png_ptr->transformations);
1025 switch (png_ptr->pass)
1030 for (i = 0; i < 8 && png_ptr->pass == 0; i++)
1036 if (png_ptr->pass == 2)
1038 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
1045 if (png_ptr->pass == 4 && png_ptr->height <= 4)
1047 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
1054 if (png_ptr->pass == 6 && png_ptr->height <= 4)
1066 for (i = 0; i < 8 && png_ptr->pass == 1; i++)
1072 if (png_ptr->pass == 2)
1074 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
1088 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
1094 for (i = 0; i < 4 && png_ptr->pass == 2; i++)
1100 if (png_ptr->pass == 4)
1102 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
1116 for (i = 0; i < 4 && png_ptr->pass == 3; i++)
1122 if (png_ptr->pass == 4)
1124 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
1138 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
1144 for (i = 0; i < 2 && png_ptr->pass == 4; i++)
1150 if (png_ptr->pass == 6)
1163 for (i = 0; i < 2 && png_ptr->pass == 5; i++)
1169 if (png_ptr->pass == 6)
1184 if (png_ptr->pass != 6)
1203 #ifdef PNG_READ_INTERLACING_SUPPORTED
1224 png_ptr->row_number++;
1225 if (png_ptr->row_number < png_ptr->num_rows)
1228 #ifdef PNG_READ_INTERLACING_SUPPORTED
1229 if (png_ptr->interlaced)
1231 png_ptr->row_number = 0;
1232 png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
1237 if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
1238 (png_ptr->pass == 3 && png_ptr->width < 3) ||
1239 (png_ptr->pass == 5 && png_ptr->width < 2))
1242 if (png_ptr->pass > 7)
1245 if (png_ptr->pass >= 7)
1248 png_ptr->iwidth = (png_ptr->width +
1249 png_pass_inc[png_ptr->pass] - 1 -
1250 png_pass_start[png_ptr->pass]) /
1251 png_pass_inc[png_ptr->pass];
1256 png_ptr->num_rows = (png_ptr->height +
1257 png_pass_yinc[png_ptr->pass] - 1 -
1258 png_pass_ystart[png_ptr->pass]) /
1259 png_pass_yinc[png_ptr->pass];
1261 }
while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
1266 #ifdef PNG_READ_tEXt_SUPPORTED
1274 png_error(png_ptr,
"Out of place tEXt");
1278 #ifdef PNG_MAX_MALLOC_64K
1279 png_ptr->skip_length = 0;
1283 png_warning(png_ptr,
"tEXt chunk too large to fit in memory");
1284 png_ptr->skip_length = length - (
png_uint_32)65535L;
1289 png_ptr->current_text = (
png_charp)png_malloc(png_ptr, length + 1);
1290 png_ptr->current_text[
length] =
'\0';
1291 png_ptr->current_text_ptr = png_ptr->current_text;
1292 png_ptr->current_text_size = (
png_size_t)length;
1293 png_ptr->current_text_left = (
png_size_t)length;
1300 if (png_ptr->buffer_size && png_ptr->current_text_left)
1304 if (png_ptr->buffer_size < png_ptr->current_text_left)
1305 text_size = png_ptr->buffer_size;
1308 text_size = png_ptr->current_text_left;
1311 png_ptr->current_text_left -= text_size;
1312 png_ptr->current_text_ptr += text_size;
1314 if (!(png_ptr->current_text_left))
1321 if (png_ptr->buffer_size < 4)
1329 #ifdef PNG_MAX_MALLOC_64K
1330 if (png_ptr->skip_length)
1334 key = png_ptr->current_text;
1336 for (text = key; *text; text++)
1339 if (text < key + png_ptr->current_text_size)
1344 text_ptr->key = key;
1345 text_ptr->itxt_length = 0;
1346 text_ptr->lang =
NULL;
1347 text_ptr->lang_key =
NULL;
1348 text_ptr->text = text;
1354 png_ptr->current_text =
NULL;
1357 png_warning(png_ptr,
"Insufficient memory to store text chunk");
1362 #ifdef PNG_READ_zTXt_SUPPORTED
1370 png_error(png_ptr,
"Out of place zTXt");
1374 #ifdef PNG_MAX_MALLOC_64K
1381 png_warning(png_ptr,
"zTXt chunk too large to fit in memory");
1387 png_ptr->current_text = (
png_charp)png_malloc(png_ptr, length + 1);
1388 png_ptr->current_text[
length] =
'\0';
1389 png_ptr->current_text_ptr = png_ptr->current_text;
1390 png_ptr->current_text_size = (
png_size_t)length;
1391 png_ptr->current_text_left = (
png_size_t)length;
1398 if (png_ptr->buffer_size && png_ptr->current_text_left)
1402 if (png_ptr->buffer_size < (
png_uint_32)png_ptr->current_text_left)
1403 text_size = png_ptr->buffer_size;
1406 text_size = png_ptr->current_text_left;
1409 png_ptr->current_text_left -= text_size;
1410 png_ptr->current_text_ptr += text_size;
1412 if (!(png_ptr->current_text_left))
1420 if (png_ptr->buffer_size < 4)
1428 key = png_ptr->current_text;
1430 for (text = key; *text; text++)
1434 if (text >= key + png_ptr->current_text_size)
1436 png_ptr->current_text =
NULL;
1445 png_ptr->current_text =
NULL;
1452 png_ptr->zstream.next_in = (
png_bytep)text;
1453 png_ptr->zstream.avail_in = (
uInt)(png_ptr->current_text_size -
1455 png_ptr->zstream.next_out = png_ptr->zbuf;
1456 png_ptr->zstream.avail_out = (
uInt)png_ptr->zbuf_size;
1458 key_size = text - key;
1463 while (png_ptr->zstream.avail_in)
1469 png_ptr->zstream.avail_in = 0;
1470 png_ptr->current_text =
NULL;
1476 if (!(png_ptr->zstream.avail_out) || ret ==
Z_STREAM_END)
1482 - png_ptr->zstream.avail_out + key_size + 1));
1485 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1489 text_size = key_size + png_ptr->zbuf_size -
1490 png_ptr->zstream.avail_out;
1492 *(text + text_size) =
'\0';
1500 text = (
png_charp)png_malloc(png_ptr, text_size +
1502 - png_ptr->zstream.avail_out + 1));
1508 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
1510 text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
1511 *(text + text_size) =
'\0';
1516 png_ptr->zstream.next_out = png_ptr->zbuf;
1517 png_ptr->zstream.avail_out = (
uInt)png_ptr->zbuf_size;
1530 png_ptr->zstream.avail_in = 0;
1534 png_ptr->current_text =
NULL;
1540 png_ptr->current_text =
NULL;
1545 text_ptr = (
png_textp)png_malloc(png_ptr,
1548 text_ptr->key = key;
1549 text_ptr->itxt_length = 0;
1550 text_ptr->lang =
NULL;
1551 text_ptr->lang_key =
NULL;
1552 text_ptr->text = text;
1560 png_warning(png_ptr,
"Insufficient memory to store text chunk");
1565 #ifdef PNG_READ_iTXt_SUPPORTED
1573 png_error(png_ptr,
"Out of place iTXt");
1577 #ifdef PNG_MAX_MALLOC_64K
1578 png_ptr->skip_length = 0;
1582 png_warning(png_ptr,
"iTXt chunk too large to fit in memory");
1583 png_ptr->skip_length = length - (
png_uint_32)65535L;
1588 png_ptr->current_text = (
png_charp)png_malloc(png_ptr, length + 1);
1589 png_ptr->current_text[
length] =
'\0';
1590 png_ptr->current_text_ptr = png_ptr->current_text;
1591 png_ptr->current_text_size = (
png_size_t)length;
1592 png_ptr->current_text_left = (
png_size_t)length;
1600 if (png_ptr->buffer_size && png_ptr->current_text_left)
1604 if (png_ptr->buffer_size < png_ptr->current_text_left)
1605 text_size = png_ptr->buffer_size;
1608 text_size = png_ptr->current_text_left;
1611 png_ptr->current_text_left -= text_size;
1612 png_ptr->current_text_ptr += text_size;
1615 if (!(png_ptr->current_text_left))
1625 if (png_ptr->buffer_size < 4)
1633 #ifdef PNG_MAX_MALLOC_64K
1634 if (png_ptr->skip_length)
1638 key = png_ptr->current_text;
1640 for (lang = key; *lang; lang++)
1643 if (lang < key + png_ptr->current_text_size - 3)
1646 comp_flag = *lang++;
1649 for (lang_key = lang; *lang_key; lang_key++)
1656 if (lang_key < key + png_ptr->current_text_size - 1)
1658 for (; *text; text++)
1662 if (text < key + png_ptr->current_text_size)
1665 text_ptr = (
png_textp)png_malloc(png_ptr,
1668 text_ptr->compression = comp_flag + 2;
1669 text_ptr->key = key;
1670 text_ptr->lang = lang;
1671 text_ptr->lang_key = lang_key;
1672 text_ptr->text = text;
1673 text_ptr->text_length = 0;
1678 png_ptr->current_text =
NULL;
1682 png_warning(png_ptr,
"Insufficient memory to store iTXt chunk");
1700 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1704 && png_ptr->read_user_chunk_fn ==
NULL
1708 png_chunk_error(png_ptr,
"unknown critical chunk");
1713 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1720 #ifdef PNG_MAX_MALLOC_64K
1723 png_warning(png_ptr,
"unknown chunk too large to fit in memory");
1724 skip = length - 65535;
1733 png_ptr->unknown_chunk.size =
length;
1736 png_ptr->unknown_chunk.data =
NULL;
1740 png_ptr->unknown_chunk.data = (
png_bytep)png_malloc(png_ptr,
1741 png_ptr->unknown_chunk.size);
1743 png_ptr->unknown_chunk.size);
1746 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1747 if (png_ptr->read_user_chunk_fn !=
NULL)
1751 ret = (*(png_ptr->read_user_chunk_fn))
1752 (png_ptr, &png_ptr->unknown_chunk);
1755 png_chunk_error(png_ptr,
"error in user chunk");
1762 png_chunk_error(png_ptr,
"unknown critical chunk");
1764 &png_ptr->unknown_chunk, 1);
1771 png_free(png_ptr, png_ptr->unknown_chunk.data);
1772 png_ptr->unknown_chunk.data =
NULL;
1784 if (png_ptr->info_fn !=
NULL)
1785 (*(png_ptr->info_fn))(png_ptr, info_ptr);
1791 if (png_ptr->end_fn !=
NULL)
1792 (*(png_ptr->end_fn))(png_ptr, info_ptr);
1798 if (png_ptr->row_fn !=
NULL)
1799 (*(png_ptr->row_fn))(png_ptr,
row, png_ptr->row_number,
1800 (
int)png_ptr->pass);
1803 #ifdef PNG_READ_INTERLACING_SUPPORTED
1808 if (png_ptr ==
NULL)
1815 if (new_row !=
NULL)
1822 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1823 png_progressive_end_ptr end_fn)
1825 if (png_ptr ==
NULL)
1828 png_ptr->info_fn = info_fn;
1829 png_ptr->row_fn = row_fn;
1830 png_ptr->end_fn = end_fn;
1838 if (png_ptr ==
NULL)
1841 return png_ptr->io_ptr;
void png_push_read_IDAT(png_structp png_ptr)
void PNGCBAPI png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
void png_read_filter_row(png_structp pp, png_row_infop row_info, png_bytep row, png_const_bytep prev_row, int filter)
void png_push_have_row(png_structp png_ptr, png_bytep row)
#define PNG_FILTER_VALUE_LAST
#define PNG_READ_USER_CHUNKS_SUPPORTED
void png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#define PNG_READ_DONE_MODE
void PNGAPI png_process_data(png_structp png_ptr, png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)
void PNGAPI png_progressive_combine_row(png_structp png_ptr, png_bytep old_row, png_const_bytep new_row)
#define PNG_UNUSED(param)
void png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
PNG_CONST png_struct FAR * png_const_structp
#define PNG_HAVE_CHUNK_HEADER
void png_push_have_end(png_structp png_ptr, png_infop info_ptr)
png_uint_32 PNGAPI png_process_data_skip(png_structp png_ptr)
#define PNG_COLOR_TYPE_PALETTE
void png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_check_chunk_name(png_structp png_ptr, png_uint_32 chunk_name)
void png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
png_error(png_ptr,"Missing IHDR before iCCP")
void PNGAPI png_set_unknown_chunks(png_structp png_ptr, png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
png_size_t PNGAPI png_process_data_pause(png_structp png_ptr, int save)
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS
void png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
void png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#define PNG_READ_IDAT_MODE
void png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
#define PNG_READ_zTXt_MODE
#define PNG_CHUNK_CRITICAL(c)
#define PNG_TEXT_COMPRESSION_zTXt
void png_do_read_transformations(png_structp png_ptr, png_row_infop row_info)
void png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
EGLContext EGLenum EGLClientBuffer buffer
void png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_push_save_buffer(png_structp png_ptr)
#define PNG_TEXT_COMPRESSION_NONE
GLenum GLenum GLvoid * row
png_struct FAR * png_structp
#define PNG_HANDLE_CHUNK_ALWAYS
png_voidp PNGAPI png_get_progressive_ptr(png_const_structp png_ptr)
#define PNG_CHUNK_FROM_STRING(s)
void png_push_crc_finish(png_structp png_ptr)
#define PNG_READ_iTXt_MODE
#define PNG_HAVE_CHUNK_AFTER_IDAT
void png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_combine_row(png_structp png_ptr, png_bytep dp, int display)
void PNGAPI png_warning(png_structp png_ptr, png_const_charp warning_message)
void png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
PNG_CONST png_byte FAR * png_const_bytep
void png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
int ZEXPORT inflate(z_streamp strm, int flush)
void png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, png_size_t buffer_length)
void png_read_push_finish_row(png_structp png_ptr)
void png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#define PNG_READ_CHUNK_MODE
#define PNG_FLAG_ZLIB_FINISHED
int png_crc_finish(png_structp png_ptr, png_uint_32 skip)
void PNGAPI png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)
int ZEXPORT inflateReset(z_streamp strm)
png_uint_32 PNGAPI png_get_uint_31(png_structp png_ptr, png_const_bytep buf)
int png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr, int num_text)
void png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, png_size_t buffer_length)
void png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
#define PNG_READ_tEXt_MODE
void png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_process_some_data(png_structp png_ptr, png_infop info_ptr)
void png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, png_uint_32 transformations)
#define PNG_FILTER_VALUE_NONE
void png_calculate_crc(png_structp png_ptr, png_const_bytep ptr, png_size_t length)
void png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void png_push_process_row(png_structp png_ptr)
void png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void PNGAPI png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)
#define PNG_READ_SIG_MODE
void png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
void PNGAPI png_free(png_structp png_ptr, png_voidp ptr)
#define PNG_ROWBYTES(pixel_bits, width)
void png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
int png_chunk_unknown_handling(png_structp png_ptr, png_uint_32 chunk_name)
void png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
void png_push_have_info(png_structp png_ptr, png_infop info_ptr)
void png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
int PNGAPI png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
void png_reset_crc(png_structp png_ptr)
#define PNG_CSTRING_FROM_CHUNK(s, c)
void PNGAPI png_benign_error(png_structp png_ptr, png_const_charp error_message)