diff options
Diffstat (limited to 'thirdparty/libpng/pngpread.c')
| -rw-r--r-- | thirdparty/libpng/pngpread.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/thirdparty/libpng/pngpread.c b/thirdparty/libpng/pngpread.c index e283627b77..2eaeca08f7 100644 --- a/thirdparty/libpng/pngpread.c +++ b/thirdparty/libpng/pngpread.c @@ -195,6 +195,106 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr) chunk_name = png_ptr->chunk_name; +#ifdef PNG_READ_APNG_SUPPORTED + if (png_ptr->num_frames_read > 0 && + png_ptr->num_frames_read < info_ptr->num_frames) + { + if (chunk_name == png_IDAT) + { + /* Discard trailing IDATs for the first frame */ + if (png_ptr->mode & PNG_HAVE_fcTL || png_ptr->num_frames_read > 1) + png_error(png_ptr, "out of place IDAT"); + + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + return; + } + else if (chunk_name == png_fdAT) + { + if (png_ptr->buffer_size < 4) + { + png_push_save_buffer(png_ptr); + return; + } + + png_ensure_sequence_number(png_ptr, 4); + + if (!(png_ptr->mode & PNG_HAVE_fcTL)) + { + /* Discard trailing fdATs for frames other than the first */ + if (png_ptr->num_frames_read < 2) + png_error(png_ptr, "out of place fdAT"); + + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + return; + } + + else + { + /* frame data follows */ + png_ptr->idat_size = png_ptr->push_length - 4; + png_ptr->mode |= PNG_HAVE_IDAT; + png_ptr->process_mode = PNG_READ_IDAT_MODE; + + return; + } + } + + else if (chunk_name == png_fcTL) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_read_reset(png_ptr); + png_ptr->mode &= ~PNG_HAVE_fcTL; + + png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length); + + if (!(png_ptr->mode & PNG_HAVE_fcTL)) + png_error(png_ptr, "missing required fcTL chunk"); + + png_read_reinit(png_ptr, info_ptr); + png_progressive_read_reset(png_ptr); + + if (png_ptr->frame_info_fn != NULL) + (*(png_ptr->frame_info_fn))(png_ptr, png_ptr->num_frames_read); + + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + + return; + } + + else + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + png_warning(png_ptr, "Skipped (ignored) a chunk " + "between APNG chunks"); + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + return; + } + + return; + } +#endif /* PNG_READ_APNG_SUPPORTED */ + if (chunk_name == png_IDAT) { if ((png_ptr->mode & PNG_AFTER_IDAT) != 0) @@ -261,6 +361,9 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr) else if (chunk_name == png_IDAT) { +#ifdef PNG_READ_APNG_SUPPORTED + png_have_info(png_ptr, info_ptr); +#endif png_ptr->idat_size = png_ptr->push_length; png_ptr->process_mode = PNG_READ_IDAT_MODE; png_push_have_info(png_ptr, info_ptr); @@ -406,6 +509,30 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr) png_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length); } #endif +#ifdef PNG_READ_APNG_SUPPORTED + else if (chunk_name == png_acTL) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_acTL(png_ptr, info_ptr, png_ptr->push_length); + } + + else if (chunk_name == png_fcTL) + { + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + + png_handle_fcTL(png_ptr, info_ptr, png_ptr->push_length); + } + +#endif /* PNG_READ_APNG_SUPPORTED */ else { @@ -539,7 +666,11 @@ png_push_read_IDAT(png_structrp png_ptr) png_byte chunk_tag[4]; /* TODO: this code can be commoned up with the same code in push_read */ +#ifdef PNG_READ_APNG_SUPPORTED + PNG_PUSH_SAVE_BUFFER_IF_LT(12) +#else PNG_PUSH_SAVE_BUFFER_IF_LT(8) +#endif png_push_fill_buffer(png_ptr, chunk_length, 4); png_ptr->push_length = png_get_uint_31(png_ptr, chunk_length); png_reset_crc(png_ptr); @@ -547,17 +678,64 @@ png_push_read_IDAT(png_structrp png_ptr) png_ptr->chunk_name = PNG_CHUNK_FROM_STRING(chunk_tag); png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; +#ifdef PNG_READ_APNG_SUPPORTED + if (png_ptr->chunk_name != png_fdAT && png_ptr->num_frames_read > 0) + { + if (png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) + { + png_ptr->process_mode = PNG_READ_CHUNK_MODE; + if (png_ptr->frame_end_fn != NULL) + (*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read); + png_ptr->num_frames_read++; + return; + } + else + { + if (png_ptr->chunk_name == png_IEND) + png_error(png_ptr, "Not enough image data"); + if (png_ptr->push_length + 4 > png_ptr->buffer_size) + { + png_push_save_buffer(png_ptr); + return; + } + png_warning(png_ptr, "Skipping (ignoring) a chunk between " + "APNG chunks"); + png_crc_finish(png_ptr, png_ptr->push_length); + png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; + return; + } + } + else +#endif +#ifdef PNG_READ_APNG_SUPPORTED + if (png_ptr->chunk_name != png_IDAT && png_ptr->num_frames_read == 0) +#else if (png_ptr->chunk_name != png_IDAT) +#endif { png_ptr->process_mode = PNG_READ_CHUNK_MODE; if ((png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED) == 0) png_error(png_ptr, "Not enough compressed data"); +#ifdef PNG_READ_APNG_SUPPORTED + if (png_ptr->frame_end_fn != NULL) + (*(png_ptr->frame_end_fn))(png_ptr, png_ptr->num_frames_read); + png_ptr->num_frames_read++; +#endif + return; } png_ptr->idat_size = png_ptr->push_length; + +#ifdef PNG_READ_APNG_SUPPORTED + if (png_ptr->num_frames_read > 0) + { + png_ensure_sequence_number(png_ptr, 4); + png_ptr->idat_size -= 4; + } +#endif } if (png_ptr->idat_size != 0 && png_ptr->save_buffer_size != 0) @@ -631,6 +809,15 @@ png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer, if (!(buffer_length > 0) || buffer == NULL) png_error(png_ptr, "No IDAT data (internal error)"); +#ifdef PNG_READ_APNG_SUPPORTED + /* If the app is not APNG-aware, decode only the first frame */ + if (!(png_ptr->apng_flags & PNG_APNG_APP) && png_ptr->num_frames_read > 0) + { + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + return; + } +#endif + /* This routine must process all the data it has been given * before returning, calling the row callback as required to * handle the uncompressed results. @@ -1085,6 +1272,18 @@ png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr, png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); } +#ifdef PNG_READ_APNG_SUPPORTED +void PNGAPI +png_set_progressive_frame_fn(png_structp png_ptr, + png_progressive_frame_ptr frame_info_fn, + png_progressive_frame_ptr frame_end_fn) +{ + png_ptr->frame_info_fn = frame_info_fn; + png_ptr->frame_end_fn = frame_end_fn; + png_ptr->apng_flags |= PNG_APNG_APP; +} +#endif + png_voidp PNGAPI png_get_progressive_ptr(png_const_structrp png_ptr) { |