png_read_chunk_header 3753 third_party/libpng/png.h PNG_EXTERN png_uint_32 png_read_chunk_header
png_read_chunk_header  441 third_party/libpng/pngread.c       png_uint_32 length = png_read_chunk_header(png_ptr);
png_read_chunk_header  741 third_party/libpng/pngread.c             png_ptr->idat_size = png_read_chunk_header(png_ptr);
png_read_chunk_header 1019 third_party/libpng/pngread.c       png_uint_32 length = png_read_chunk_header(png_ptr);