diff options
Diffstat (limited to 'thirdparty/libpng/pngrutil.c')
| -rw-r--r-- | thirdparty/libpng/pngrutil.c | 329 |
1 files changed, 308 insertions, 21 deletions
diff --git a/thirdparty/libpng/pngrutil.c b/thirdparty/libpng/pngrutil.c index 7001f1976e..ae66a48a83 100644 --- a/thirdparty/libpng/pngrutil.c +++ b/thirdparty/libpng/pngrutil.c @@ -1,10 +1,10 @@ /* pngrutil.c - utilities to read a PNG file * - * Last changed in libpng 1.6.35 [July 15, 2018] + * Copyright (c) 2018 Cosmin Truta * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson - * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) - * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * Copyright (c) 1996-1997 Andreas Dilger + * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer @@ -865,6 +865,11 @@ png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) filter_type = buf[11]; interlace_type = buf[12]; +#ifdef PNG_READ_APNG_SUPPORTED + png_ptr->first_frame_width = width; + png_ptr->first_frame_height = height; +#endif + /* Set internal variables */ png_ptr->width = width; png_ptr->height = height; @@ -1461,8 +1466,7 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { /* We have the ICC profile header; do the basic header checks. */ - const png_uint_32 profile_length = - png_get_uint_32(profile_header); + png_uint_32 profile_length = png_get_uint_32(profile_header); if (png_icc_check_length(png_ptr, &png_ptr->colorspace, keyword, profile_length) != 0) @@ -1479,8 +1483,8 @@ png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) * profile. The header check has already validated * that none of this stuff will overflow. */ - const png_uint_32 tag_count = png_get_uint_32( - profile_header+128); + png_uint_32 tag_count = + png_get_uint_32(profile_header + 128); png_bytep profile = png_read_buffer(png_ptr, profile_length, 2/*silent*/); @@ -2858,6 +2862,179 @@ png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) } #endif +#ifdef PNG_READ_APNG_SUPPORTED +void /* PRIVATE */ +png_handle_acTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte data[8]; + png_uint_32 num_frames; + png_uint_32 num_plays; + png_uint_32 didSet; + + png_debug(1, "in png_handle_acTL"); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + { + png_error(png_ptr, "Missing IHDR before acTL"); + } + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + png_warning(png_ptr, "Invalid acTL after IDAT skipped"); + png_crc_finish(png_ptr, length); + return; + } + else if (png_ptr->mode & PNG_HAVE_acTL) + { + png_warning(png_ptr, "Duplicate acTL skipped"); + png_crc_finish(png_ptr, length); + return; + } + else if (length != 8) + { + png_warning(png_ptr, "acTL with invalid length skipped"); + png_crc_finish(png_ptr, length); + return; + } + + png_crc_read(png_ptr, data, 8); + png_crc_finish(png_ptr, 0); + + num_frames = png_get_uint_31(png_ptr, data); + num_plays = png_get_uint_31(png_ptr, data + 4); + + /* the set function will do error checking on num_frames */ + didSet = png_set_acTL(png_ptr, info_ptr, num_frames, num_plays); + if(didSet) + png_ptr->mode |= PNG_HAVE_acTL; +} + +void /* PRIVATE */ +png_handle_fcTL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_byte data[22]; + png_uint_32 width; + png_uint_32 height; + png_uint_32 x_offset; + png_uint_32 y_offset; + png_uint_16 delay_num; + png_uint_16 delay_den; + png_byte dispose_op; + png_byte blend_op; + + png_debug(1, "in png_handle_fcTL"); + + png_ensure_sequence_number(png_ptr, length); + + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + { + png_error(png_ptr, "Missing IHDR before fcTL"); + } + else if (png_ptr->mode & PNG_HAVE_IDAT) + { + /* for any frames other then the first this message may be misleading, + * but correct. PNG_HAVE_IDAT is unset before the frame head is read + * i can't think of a better message */ + png_warning(png_ptr, "Invalid fcTL after IDAT skipped"); + png_crc_finish(png_ptr, length-4); + return; + } + else if (png_ptr->mode & PNG_HAVE_fcTL) + { + png_warning(png_ptr, "Duplicate fcTL within one frame skipped"); + png_crc_finish(png_ptr, length-4); + return; + } + else if (length != 26) + { + png_warning(png_ptr, "fcTL with invalid length skipped"); + png_crc_finish(png_ptr, length-4); + return; + } + + png_crc_read(png_ptr, data, 22); + png_crc_finish(png_ptr, 0); + + width = png_get_uint_31(png_ptr, data); + height = png_get_uint_31(png_ptr, data + 4); + x_offset = png_get_uint_31(png_ptr, data + 8); + y_offset = png_get_uint_31(png_ptr, data + 12); + delay_num = png_get_uint_16(data + 16); + delay_den = png_get_uint_16(data + 18); + dispose_op = data[20]; + blend_op = data[21]; + + if (png_ptr->num_frames_read == 0 && (x_offset != 0 || y_offset != 0)) + { + png_warning(png_ptr, "fcTL for the first frame must have zero offset"); + return; + } + + if (info_ptr != NULL) + { + if (png_ptr->num_frames_read == 0 && + (width != info_ptr->width || height != info_ptr->height)) + { + png_warning(png_ptr, "size in first frame's fcTL must match " + "the size in IHDR"); + return; + } + + /* The set function will do more error checking */ + png_set_next_frame_fcTL(png_ptr, info_ptr, width, height, + x_offset, y_offset, delay_num, delay_den, + dispose_op, blend_op); + + png_read_reinit(png_ptr, info_ptr); + + png_ptr->mode |= PNG_HAVE_fcTL; + } +} + +void /* PRIVATE */ +png_have_info(png_structp png_ptr, png_infop info_ptr) +{ + if((info_ptr->valid & PNG_INFO_acTL) && !(info_ptr->valid & PNG_INFO_fcTL)) + { + png_ptr->apng_flags |= PNG_FIRST_FRAME_HIDDEN; + info_ptr->num_frames++; + } +} + +void /* PRIVATE */ +png_handle_fdAT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +{ + png_ensure_sequence_number(png_ptr, length); + + /* This function is only called from png_read_end(), png_read_info(), + * and png_push_read_chunk() which means that: + * - the user doesn't want to read this frame + * - or this is an out-of-place fdAT + * in either case it is safe to ignore the chunk with a warning */ + png_warning(png_ptr, "ignoring fdAT chunk"); + png_crc_finish(png_ptr, length - 4); + PNG_UNUSED(info_ptr) +} + +void /* PRIVATE */ +png_ensure_sequence_number(png_structp png_ptr, png_uint_32 length) +{ + png_byte data[4]; + png_uint_32 sequence_number; + + if (length < 4) + png_error(png_ptr, "invalid fcTL or fdAT chunk found"); + + png_crc_read(png_ptr, data, 4); + sequence_number = png_get_uint_31(png_ptr, data); + + if (sequence_number != png_ptr->next_seq_num) + png_error(png_ptr, "fcTL or fdAT chunk with out-of-order sequence " + "number found"); + + png_ptr->next_seq_num++; +} +#endif /* PNG_READ_APNG_SUPPORTED */ + #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED /* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */ static int @@ -3132,7 +3309,7 @@ png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, */ void /* PRIVATE */ -png_check_chunk_name(png_const_structrp png_ptr, const png_uint_32 chunk_name) +png_check_chunk_name(png_const_structrp png_ptr, png_uint_32 chunk_name) { int i; png_uint_32 cn=chunk_name; @@ -3151,7 +3328,7 @@ png_check_chunk_name(png_const_structrp png_ptr, const png_uint_32 chunk_name) } void /* PRIVATE */ -png_check_chunk_length(png_const_structrp png_ptr, const png_uint_32 length) +png_check_chunk_length(png_const_structrp png_ptr, png_uint_32 length) { png_alloc_size_t limit = PNG_UINT_31_MAX; @@ -3363,7 +3540,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display) /* Hence the pre-compiled masks indexed by PACKSWAP (or not), depth and * then pass: */ - static PNG_CONST png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] = + static const png_uint_32 row_mask[2/*PACKSWAP*/][3/*depth*/][6] = { /* Little-endian byte masks for PACKSWAP */ { S_MASKS(1,0), S_MASKS(2,0), S_MASKS(4,0) }, @@ -3374,7 +3551,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display) /* display_mask has only three entries for the odd passes, so index by * pass>>1. */ - static PNG_CONST png_uint_32 display_mask[2][3][3] = + static const png_uint_32 display_mask[2][3][3] = { /* Little-endian byte masks for PACKSWAP */ { B_MASKS(1,0), B_MASKS(2,0), B_MASKS(4,0) }, @@ -3687,7 +3864,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass, { /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Offset to next interlace block */ - static PNG_CONST unsigned int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const unsigned int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; png_debug(1, "in png_do_read_interlace"); if (row != NULL && row_info != NULL) @@ -4166,7 +4343,38 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output, { uInt avail_in; png_bytep buffer; +#ifdef PNG_READ_APNG_SUPPORTED + png_uint_32 bytes_to_skip = 0; + + while (png_ptr->idat_size == 0 || bytes_to_skip != 0) + { + png_crc_finish(png_ptr, bytes_to_skip); + bytes_to_skip = 0; + + png_ptr->idat_size = png_read_chunk_header(png_ptr); + if (png_ptr->num_frames_read == 0) + { + if (png_ptr->chunk_name != png_IDAT) + png_error(png_ptr, "Not enough image data"); + } + else + { + if (png_ptr->chunk_name == png_IEND) + png_error(png_ptr, "Not enough image data"); + if (png_ptr->chunk_name != png_fdAT) + { + png_warning(png_ptr, "Skipped (ignored) a chunk " + "between APNG chunks"); + bytes_to_skip = png_ptr->idat_size; + continue; + } + + png_ensure_sequence_number(png_ptr, png_ptr->idat_size); + png_ptr->idat_size -= 4; + } + } +#else while (png_ptr->idat_size == 0) { png_crc_finish(png_ptr, 0); @@ -4178,7 +4386,7 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output, if (png_ptr->chunk_name != png_IDAT) png_error(png_ptr, "Not enough image data"); } - +#endif /* PNG_READ_APNG_SUPPORTED */ avail_in = png_ptr->IDAT_read_size; if (avail_in > png_ptr->idat_size) @@ -4241,6 +4449,9 @@ png_read_IDAT_data(png_structrp png_ptr, png_bytep output, png_ptr->mode |= PNG_AFTER_IDAT; png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; +#ifdef PNG_READ_APNG_SUPPORTED + png_ptr->num_frames_read++; +#endif if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0) png_chunk_benign_error(png_ptr, "Extra compressed data"); @@ -4329,16 +4540,16 @@ png_read_finish_row(png_structrp png_ptr) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; png_debug(1, "in png_read_finish_row"); png_ptr->row_number++; @@ -4394,16 +4605,16 @@ png_read_start_row(png_structrp png_ptr) /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; + static const png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; + static const png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; + static const png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; + static const png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; unsigned int max_pixel_depth; size_t row_bytes; @@ -4679,4 +4890,80 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) png_ptr->flags |= PNG_FLAG_ROW_INIT; } + +#ifdef PNG_READ_APNG_SUPPORTED +/* This function is to be called after the main IDAT set has been read and + * before a new IDAT is read. It resets some parts of png_ptr + * to make them usable by the read functions again */ +void /* PRIVATE */ +png_read_reset(png_structp png_ptr) +{ + png_ptr->mode &= ~PNG_HAVE_IDAT; + png_ptr->mode &= ~PNG_AFTER_IDAT; + png_ptr->row_number = 0; + png_ptr->pass = 0; +} + +void /* PRIVATE */ +png_read_reinit(png_structp png_ptr, png_infop info_ptr) +{ + png_ptr->width = info_ptr->next_frame_width; + png_ptr->height = info_ptr->next_frame_height; + png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth,png_ptr->width); + png_ptr->info_rowbytes = PNG_ROWBYTES(info_ptr->pixel_depth, + png_ptr->width); + if (png_ptr->prev_row) + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); +} + +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED +/* same as png_read_reset() but for the progressive reader */ +void /* PRIVATE */ +png_progressive_read_reset(png_structp png_ptr) +{ +#ifdef PNG_READ_INTERLACING_SUPPORTED + /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ + + /* Start of interlace block */ + const int png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; + + /* Offset to next interlace block */ + const int png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; + + /* Start of interlace block in the y direction */ + const int png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; + + /* Offset to next interlace block in the y direction */ + const int png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; + + if (png_ptr->interlaced) + { + if (!(png_ptr->transformations & PNG_INTERLACE)) + png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 - + png_pass_ystart[0]) / png_pass_yinc[0]; + else + png_ptr->num_rows = png_ptr->height; + + png_ptr->iwidth = (png_ptr->width + + png_pass_inc[png_ptr->pass] - 1 - + png_pass_start[png_ptr->pass]) / + png_pass_inc[png_ptr->pass]; + } + else +#endif /* PNG_READ_INTERLACING_SUPPORTED */ + { + png_ptr->num_rows = png_ptr->height; + png_ptr->iwidth = png_ptr->width; + } + png_ptr->flags &= ~PNG_FLAG_ZSTREAM_ENDED; + if (inflateReset(&(png_ptr->zstream)) != Z_OK) + png_error(png_ptr, "inflateReset failed"); + png_ptr->zstream.avail_in = 0; + png_ptr->zstream.next_in = 0; + png_ptr->zstream.next_out = png_ptr->row_buf; + png_ptr->zstream.avail_out = (uInt)PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1; +} +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ +#endif /* PNG_READ_APNG_SUPPORTED */ #endif /* READ */ |