diff options
Diffstat (limited to 'pngread.c')
| -rw-r--r-- | pngread.c | 99 |
1 files changed, 64 insertions, 35 deletions
@@ -1,7 +1,7 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.6.9 [February 6, 2014] + * Last changed in libpng 1.6.10 [March 6, 2014] * Copyright (c) 1998-2014 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.) @@ -781,11 +781,14 @@ png_read_end(png_structrp png_ptr, png_inforp info_ptr) png_uint_32 length = png_read_chunk_header(png_ptr); png_uint_32 chunk_name = png_ptr->chunk_name; - if (chunk_name == png_IHDR) + if (chunk_name == png_IEND) + png_handle_IEND(png_ptr, info_ptr, length); + + else if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); - else if (chunk_name == png_IEND) - png_handle_IEND(png_ptr, info_ptr, length); + else if (info_ptr == NULL) + png_crc_finish(png_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) @@ -1001,8 +1004,6 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params) { - int row; - if (png_ptr == NULL || info_ptr == NULL) return; @@ -1014,120 +1015,149 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr, png_error(png_ptr, "Image is too high to process with png_read_png()"); /* -------------- image transformations start here ------------------- */ + /* libpng 1.6.10: add code to cause a png_app_error if a selected TRANSFORM + * is not implemented. This will only happen in de-configured (non-default) + * libpng builds. The results can be unexpected - png_read_png may return + * short or mal-formed rows because the transform is skipped. + */ -#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED /* Tell libpng to strip 16-bit/color files down to 8 bits per color. */ if (transforms & PNG_TRANSFORM_SCALE_16) - { /* Added at libpng-1.5.4. "strip_16" produces the same result that it * did in earlier versions, while "scale_16" is now more accurate. */ +#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED png_set_scale_16(png_ptr); - } +#else + png_app_error(png_ptr, "PNG_TRANSFORM_SCALE_16 not supported"); #endif -#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED /* If both SCALE and STRIP are required pngrtran will effectively cancel the * latter by doing SCALE first. This is ok and allows apps not to check for * which is supported to get the right answer. */ if (transforms & PNG_TRANSFORM_STRIP_16) +#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED png_set_strip_16(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_16 not supported"); #endif -#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED /* Strip alpha bytes from the input data without combining with * the background (not recommended). */ if (transforms & PNG_TRANSFORM_STRIP_ALPHA) +#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED png_set_strip_alpha(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_STRIP_ALPHA not supported"); #endif -#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED) /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single * byte into separate bytes (useful for paletted and grayscale images). */ if (transforms & PNG_TRANSFORM_PACKING) +#ifdef PNG_READ_PACK_SUPPORTED png_set_packing(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_PACKING not supported"); #endif -#ifdef PNG_READ_PACKSWAP_SUPPORTED /* Change the order of packed pixels to least significant bit first * (not useful if you are using png_set_packing). */ if (transforms & PNG_TRANSFORM_PACKSWAP) +#ifdef PNG_READ_PACKSWAP_SUPPORTED png_set_packswap(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_PACKSWAP not supported"); #endif -#ifdef PNG_READ_EXPAND_SUPPORTED /* Expand paletted colors into true RGB triplets * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel * Expand paletted or RGB images with transparency to full alpha * channels so the data will be available as RGBA quartets. */ if (transforms & PNG_TRANSFORM_EXPAND) - if ((png_ptr->bit_depth < 8) || - (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) || - (info_ptr->valid & PNG_INFO_tRNS)) - png_set_expand(png_ptr); +#ifdef PNG_READ_EXPAND_SUPPORTED + png_set_expand(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_EXPAND not supported"); #endif /* We don't handle background color or gamma transformation or quantizing. */ -#ifdef PNG_READ_INVERT_SUPPORTED /* Invert monochrome files to have 0 as white and 1 as black */ if (transforms & PNG_TRANSFORM_INVERT_MONO) +#ifdef PNG_READ_INVERT_SUPPORTED png_set_invert_mono(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_MONO not supported"); #endif -#ifdef PNG_READ_SHIFT_SUPPORTED /* If you want to shift the pixel values from the range [0,255] or * [0,65535] to the original [0,7] or [0,31], or whatever range the * colors were originally in: */ - if ((transforms & PNG_TRANSFORM_SHIFT) && (info_ptr->valid & PNG_INFO_sBIT)) - png_set_shift(png_ptr, &info_ptr->sig_bit); + if (transforms & PNG_TRANSFORM_SHIFT) +#ifdef PNG_READ_SHIFT_SUPPORTED + if (info_ptr->valid & PNG_INFO_sBIT) + png_set_shift(png_ptr, &info_ptr->sig_bit); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_SHIFT not supported"); #endif -#ifdef PNG_READ_BGR_SUPPORTED /* Flip the RGB pixels to BGR (or RGBA to BGRA) */ if (transforms & PNG_TRANSFORM_BGR) +#ifdef PNG_READ_BGR_SUPPORTED png_set_bgr(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_BGR not supported"); #endif -#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */ if (transforms & PNG_TRANSFORM_SWAP_ALPHA) +#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED png_set_swap_alpha(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ALPHA not supported"); #endif -#ifdef PNG_READ_SWAP_SUPPORTED /* Swap bytes of 16-bit files to least significant byte first */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) +#ifdef PNG_READ_SWAP_SUPPORTED png_set_swap(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_SWAP_ENDIAN not supported"); #endif /* Added at libpng-1.2.41 */ -#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED /* Invert the alpha channel from opacity to transparency */ if (transforms & PNG_TRANSFORM_INVERT_ALPHA) +#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED png_set_invert_alpha(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_INVERT_ALPHA not supported"); #endif /* Added at libpng-1.2.41 */ -#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED /* Expand grayscale image to RGB */ if (transforms & PNG_TRANSFORM_GRAY_TO_RGB) +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED png_set_gray_to_rgb(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_GRAY_TO_RGB not supported"); #endif /* Added at libpng-1.5.4 */ -#ifdef PNG_READ_EXPAND_16_SUPPORTED if (transforms & PNG_TRANSFORM_EXPAND_16) +#ifdef PNG_READ_EXPAND_16_SUPPORTED png_set_expand_16(png_ptr); +#else + png_app_error(png_ptr, "PNG_TRANSFORM_EXPAND_16 not supported"); #endif /* We don't handle adding filler bytes */ @@ -1150,16 +1180,17 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr, { png_uint_32 iptr; - info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, - info_ptr->height * (sizeof (png_bytep))); + info_ptr->row_pointers = png_voidcast(png_bytepp, png_malloc(png_ptr, + info_ptr->height * (sizeof (png_bytep)))); + for (iptr=0; iptr<info_ptr->height; iptr++) info_ptr->row_pointers[iptr] = NULL; info_ptr->free_me |= PNG_FREE_ROWS; - for (row = 0; row < (int)info_ptr->height; row++) - info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr, - png_get_rowbytes(png_ptr, info_ptr)); + for (iptr = 0; iptr < info_ptr->height; iptr++) + info_ptr->row_pointers[iptr] = png_voidcast(png_bytep, + png_malloc(png_ptr, info_ptr->rowbytes)); } png_read_image(png_ptr, info_ptr->row_pointers); @@ -1168,9 +1199,7 @@ png_read_png(png_structrp png_ptr, png_inforp info_ptr, /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */ png_read_end(png_ptr, info_ptr); - PNG_UNUSED(transforms) /* Quiet compiler warnings */ PNG_UNUSED(params) - } #endif /* PNG_INFO_IMAGE_SUPPORTED */ #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ |