diff options
Diffstat (limited to 'src/3rdparty/libpng/pngread.c')
| -rw-r--r-- | src/3rdparty/libpng/pngread.c | 527 |
1 files changed, 183 insertions, 344 deletions
diff --git a/src/3rdparty/libpng/pngread.c b/src/3rdparty/libpng/pngread.c index 2c8f2cd687..1d8c6b3346 100644 --- a/src/3rdparty/libpng/pngread.c +++ b/src/3rdparty/libpng/pngread.c @@ -1,8 +1,8 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.5.1 [$RDATE%] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.5.10 [March 8, 2012] + * Copyright (c) 1998-2012 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.) * @@ -47,12 +47,10 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, #ifdef PNG_SETJMP_SUPPORTED #ifdef USE_FAR_KEYWORD - jmp_buf png_jmpbuf; + jmp_buf tmp_jmpbuf; #endif #endif - int i; - png_debug(1, "in png_create_read_struct"); #ifdef PNG_USER_MEM_SUPPORTED @@ -69,29 +67,26 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_ptr->user_width_max = PNG_USER_WIDTH_MAX; png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; -# ifdef PNG_USER_CHUNK_CACHE_MAX /* Added at libpng-1.2.43 and 1.4.0 */ png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; -# endif -# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX /* Added at libpng-1.2.43 and 1.4.1 */ png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; -# endif #endif #ifdef PNG_SETJMP_SUPPORTED /* Applications that neglect to set up their own setjmp() and then - encounter a png_error() will longjmp here. Since the jmpbuf is - then meaningless we abort instead of returning. */ + * encounter a png_error() will longjmp here. Since the jmpbuf is + * then meaningless we abort instead of returning. + */ #ifdef USE_FAR_KEYWORD - if (setjmp(png_jmpbuf)) + if (setjmp(tmp_jmpbuf)) #else if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ #endif PNG_ABORT(); #ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif #endif /* PNG_SETJMP_SUPPORTED */ @@ -101,54 +96,9 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - if (user_png_ver) - { - i = 0; - - do - { - if (user_png_ver[i] != png_libpng_ver[i]) - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - } while (png_libpng_ver[i++]); - } - - else - png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH; - - - if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH) - { - /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so - * we must recompile any applications that use any older library version. - * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. - */ - if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || - (user_png_ver[0] == '0' && user_png_ver[2] < '9')) - { -#ifdef PNG_CONSOLE_IO_SUPPORTED - char msg[80]; - if (user_png_ver) - { - png_snprintf2(msg, 80, - "Application built with libpng-%.20s" - " but running with %.20s", - user_png_ver, - png_libpng_ver); - png_warning(png_ptr, msg); - } -#else - png_warning(png_ptr, - "Incompatible libpng version in application and library"); -#endif -#ifdef PNG_ERROR_NUMBERS_SUPPORTED - png_ptr->flags = 0; -#endif - - png_cleanup_needed = 1; - } - } + /* Call the general version checker (shared with read and write code): */ + if (!png_user_version_check(png_ptr, user_png_ver)) + png_cleanup_needed = 1; if (!png_cleanup_needed) { @@ -237,89 +187,35 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) for (;;) { - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; -#ifdef PNG_READ_bKGD_SUPPORTED - PNG_bKGD; -#endif -#ifdef PNG_READ_cHRM_SUPPORTED - PNG_cHRM; -#endif -#ifdef PNG_READ_gAMA_SUPPORTED - PNG_gAMA; -#endif -#ifdef PNG_READ_hIST_SUPPORTED - PNG_hIST; -#endif -#ifdef PNG_READ_iCCP_SUPPORTED - PNG_iCCP; -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - PNG_iTXt; -#endif -#ifdef PNG_READ_oFFs_SUPPORTED - PNG_oFFs; -#endif -#ifdef PNG_READ_pCAL_SUPPORTED - PNG_pCAL; -#endif -#ifdef PNG_READ_pHYs_SUPPORTED - PNG_pHYs; -#endif -#ifdef PNG_READ_sBIT_SUPPORTED - PNG_sBIT; -#endif -#ifdef PNG_READ_sCAL_SUPPORTED - PNG_sCAL; -#endif -#ifdef PNG_READ_sPLT_SUPPORTED - PNG_sPLT; -#endif -#ifdef PNG_READ_sRGB_SUPPORTED - PNG_sRGB; -#endif -#ifdef PNG_READ_tEXt_SUPPORTED - PNG_tEXt; -#endif -#ifdef PNG_READ_tIME_SUPPORTED - PNG_tIME; -#endif -#ifdef PNG_READ_tRNS_SUPPORTED - PNG_tRNS; -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - PNG_zTXt; -#endif png_uint_32 length = png_read_chunk_header(png_ptr); - PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + png_uint_32 chunk_name = png_ptr->chunk_name; /* This should be a binary subdivision search or a hash for * matching the chunk name rather than a linear search. */ - if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (chunk_name == png_IDAT) if (png_ptr->mode & PNG_AFTER_IDAT) png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; - if (!png_memcmp(chunk_name, png_IHDR, 4)) + if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IEND, 4)) + else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, chunk_name)) + else if (png_chunk_unknown_handling(png_ptr, chunk_name) != + PNG_HANDLE_CHUNK_AS_DEFAULT) { - if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (chunk_name == png_IDAT) png_ptr->mode |= PNG_HAVE_IDAT; png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(chunk_name, png_PLTE, 4)) + if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; - else if (!png_memcmp(chunk_name, png_IDAT, 4)) + else if (chunk_name == png_IDAT) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) png_error(png_ptr, "Missing IHDR before IDAT"); @@ -332,10 +228,10 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) } } #endif - else if (!png_memcmp(chunk_name, png_PLTE, 4)) + else if (chunk_name == png_PLTE) png_handle_PLTE(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IDAT, 4)) + else if (chunk_name == png_IDAT) { if (!(png_ptr->mode & PNG_HAVE_IHDR)) png_error(png_ptr, "Missing IHDR before IDAT"); @@ -350,87 +246,87 @@ png_read_info(png_structp png_ptr, png_infop info_ptr) } #ifdef PNG_READ_bKGD_SUPPORTED - else if (!png_memcmp(chunk_name, png_bKGD, 4)) + else if (chunk_name == png_bKGD) png_handle_bKGD(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_cHRM_SUPPORTED - else if (!png_memcmp(chunk_name, png_cHRM, 4)) + else if (chunk_name == png_cHRM) png_handle_cHRM(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_gAMA_SUPPORTED - else if (!png_memcmp(chunk_name, png_gAMA, 4)) + else if (chunk_name == png_gAMA) png_handle_gAMA(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_hIST_SUPPORTED - else if (!png_memcmp(chunk_name, png_hIST, 4)) + else if (chunk_name == png_hIST) png_handle_hIST(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_oFFs_SUPPORTED - else if (!png_memcmp(chunk_name, png_oFFs, 4)) + else if (chunk_name == png_oFFs) png_handle_oFFs(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_pCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_pCAL, 4)) + else if (chunk_name == png_pCAL) png_handle_pCAL(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_sCAL, 4)) + else if (chunk_name == png_sCAL) png_handle_sCAL(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_pHYs_SUPPORTED - else if (!png_memcmp(chunk_name, png_pHYs, 4)) + else if (chunk_name == png_pHYs) png_handle_pHYs(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sBIT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sBIT, 4)) + else if (chunk_name == png_sBIT) png_handle_sBIT(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sRGB_SUPPORTED - else if (!png_memcmp(chunk_name, png_sRGB, 4)) + else if (chunk_name == png_sRGB) png_handle_sRGB(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_iCCP_SUPPORTED - else if (!png_memcmp(chunk_name, png_iCCP, 4)) + else if (chunk_name == png_iCCP) png_handle_iCCP(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sPLT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sPLT, 4)) + else if (chunk_name == png_sPLT) png_handle_sPLT(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tEXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_tEXt, 4)) + else if (chunk_name == png_tEXt) png_handle_tEXt(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tIME_SUPPORTED - else if (!png_memcmp(chunk_name, png_tIME, 4)) + else if (chunk_name == png_tIME) png_handle_tIME(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tRNS_SUPPORTED - else if (!png_memcmp(chunk_name, png_tRNS, 4)) + else if (chunk_name == png_tRNS) png_handle_tRNS(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_zTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_zTXt, 4)) + else if (chunk_name == png_zTXt) png_handle_zTXt(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_iTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_iTXt, 4)) + else if (chunk_name == png_iTXt) png_handle_iTXt(png_ptr, info_ptr, length); #endif @@ -449,15 +345,13 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr) if (png_ptr == NULL) return; - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - png_read_start_row(png_ptr); - - else - png_warning(png_ptr, - "Ignoring extra png_read_update_info() call;" - " row buffer not reallocated"); + png_read_start_row(png_ptr); +#ifdef PNG_READ_TRANSFORMS_SUPPORTED png_read_transform_info(png_ptr, info_ptr); +#else + PNG_UNUSED(info_ptr) +#endif } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED @@ -471,15 +365,8 @@ png_start_read_image(png_structp png_ptr) { png_debug(1, "in png_start_read_image"); - if (png_ptr == NULL) - return; - - if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) - png_read_start_row(png_ptr); - else - png_warning(png_ptr, - "Ignoring extra png_start_read_image() call;" - " row buffer not reallocated"); + if (png_ptr != NULL) + png_read_start_row(png_ptr); } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ @@ -487,21 +374,30 @@ png_start_read_image(png_structp png_ptr) void PNGAPI png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) { - PNG_IDAT; - PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, - 0xff}; - PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; int ret; + png_row_info row_info; + if (png_ptr == NULL) return; png_debug2(1, "in png_read_row (row %lu, pass %d)", (unsigned long)png_ptr->row_number, png_ptr->pass); + /* png_read_start_row sets the information (in particular iwidth) for this + * interlace pass. + */ if (!(png_ptr->flags & PNG_FLAG_ROW_INIT)) png_read_start_row(png_ptr); + /* 1.5.6: row_info moved out of png_struct to a local here. */ + row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */ + row_info.color_type = png_ptr->color_type; + row_info.bit_depth = png_ptr->bit_depth; + row_info.channels = png_ptr->channels; + row_info.pixel_depth = png_ptr->pixel_depth; + row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width); + if (png_ptr->row_number == 0 && png_ptr->pass == 0) { /* Check for transforms that have been set but were defined out */ @@ -543,7 +439,12 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } #ifdef PNG_READ_INTERLACING_SUPPORTED - /* If interlaced and we do not need a new row, combine row and return */ + /* If interlaced and we do not need a new row, combine row and return. + * Notice that the pixels we have from previous rows have been transformed + * already; we can only combine like with like (transformed or + * untransformed) and, because of the libpng API for interlaced images, this + * means we must transform before de-interlacing. + */ if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE)) { switch (png_ptr->pass) @@ -552,8 +453,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if (png_ptr->row_number & 0x07) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; } @@ -563,8 +463,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 0x07) || png_ptr->width < 5) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; @@ -575,8 +474,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 0x07) != 4) { if (dsp_row != NULL && (png_ptr->row_number & 4)) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; @@ -587,8 +485,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 3) || png_ptr->width < 3) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; @@ -599,8 +496,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 3) != 2) { if (dsp_row != NULL && (png_ptr->row_number & 2)) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; @@ -610,8 +506,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) if ((png_ptr->row_number & 1) || png_ptr->width < 2) { if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, - png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); png_read_finish_row(png_ptr); return; @@ -647,7 +542,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) png_crc_finish(png_ptr, 0); png_ptr->idat_size = png_read_chunk_header(png_ptr); - if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) + if (png_ptr->chunk_name != png_IDAT) png_error(png_ptr, "Not enough image data"); } png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; @@ -677,33 +572,47 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) } while (png_ptr->zstream.avail_out); - png_ptr->row_info.color_type = png_ptr->color_type; - png_ptr->row_info.width = png_ptr->iwidth; - png_ptr->row_info.channels = png_ptr->channels; - png_ptr->row_info.bit_depth = png_ptr->bit_depth; - png_ptr->row_info.pixel_depth = png_ptr->pixel_depth; - png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth, - png_ptr->row_info.width); - - if (png_ptr->row_buf[0]) - png_read_filter_row(png_ptr, &(png_ptr->row_info), - png_ptr->row_buf + 1, png_ptr->prev_row + 1, - (int)(png_ptr->row_buf[0])); + if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE) + { + if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST) + png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1, + png_ptr->prev_row + 1, png_ptr->row_buf[0]); + else + png_error(png_ptr, "bad adaptive filter value"); + } - png_memcpy(png_ptr->prev_row, png_ptr->row_buf, png_ptr->rowbytes + 1); + /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before + * 1.5.6, while the buffer really is this big in current versions of libpng + * it may not be in the future, so this was changed just to copy the + * interlaced count: + */ + png_memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) { /* Intrapixel differencing */ - png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1); + png_do_read_intrapixel(&row_info, png_ptr->row_buf + 1); } #endif - if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA)) - png_do_read_transformations(png_ptr); +#ifdef PNG_READ_TRANSFORMS_SUPPORTED + if (png_ptr->transformations) + png_do_read_transformations(png_ptr, &row_info); +#endif + + /* The transformed pixel depth should match the depth now in row_info. */ + if (png_ptr->transformed_pixel_depth == 0) + { + png_ptr->transformed_pixel_depth = row_info.pixel_depth; + if (row_info.pixel_depth > png_ptr->maximum_pixel_depth) + png_error(png_ptr, "sequential row overflow"); + } + + else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth) + png_error(png_ptr, "internal sequential row size calculation error"); #ifdef PNG_READ_INTERLACING_SUPPORTED /* Blow up interlaced rows to full size */ @@ -711,27 +620,24 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) (png_ptr->transformations & PNG_INTERLACE)) { if (png_ptr->pass < 6) - /* Old interface (pre-1.0.9): - * png_do_read_interlace(&(png_ptr->row_info), - * png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations); - */ - png_do_read_interlace(png_ptr); + png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass, + png_ptr->transformations); if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, png_pass_dsp_mask[png_ptr->pass]); + png_combine_row(png_ptr, dsp_row, 1/*display*/); if (row != NULL) - png_combine_row(png_ptr, row, png_pass_mask[png_ptr->pass]); + png_combine_row(png_ptr, row, 0/*row*/); } else #endif { if (row != NULL) - png_combine_row(png_ptr, row, 0xff); + png_combine_row(png_ptr, row, -1/*ignored*/); if (dsp_row != NULL) - png_combine_row(png_ptr, dsp_row, 0xff); + png_combine_row(png_ptr, dsp_row, -1/*ignored*/); } png_read_finish_row(png_ptr); @@ -895,87 +801,40 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ +#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED + /* Report invalid palette index; added at libng-1.5.10 */ + if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + png_ptr->num_palette_max > png_ptr->num_palette) + png_benign_error(png_ptr, "Read palette index exceeding num_palette"); +#endif + do { - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; -#ifdef PNG_READ_bKGD_SUPPORTED - PNG_bKGD; -#endif -#ifdef PNG_READ_cHRM_SUPPORTED - PNG_cHRM; -#endif -#ifdef PNG_READ_gAMA_SUPPORTED - PNG_gAMA; -#endif -#ifdef PNG_READ_hIST_SUPPORTED - PNG_hIST; -#endif -#ifdef PNG_READ_iCCP_SUPPORTED - PNG_iCCP; -#endif -#ifdef PNG_READ_iTXt_SUPPORTED - PNG_iTXt; -#endif -#ifdef PNG_READ_oFFs_SUPPORTED - PNG_oFFs; -#endif -#ifdef PNG_READ_pCAL_SUPPORTED - PNG_pCAL; -#endif -#ifdef PNG_READ_pHYs_SUPPORTED - PNG_pHYs; -#endif -#ifdef PNG_READ_sBIT_SUPPORTED - PNG_sBIT; -#endif -#ifdef PNG_READ_sCAL_SUPPORTED - PNG_sCAL; -#endif -#ifdef PNG_READ_sPLT_SUPPORTED - PNG_sPLT; -#endif -#ifdef PNG_READ_sRGB_SUPPORTED - PNG_sRGB; -#endif -#ifdef PNG_READ_tEXt_SUPPORTED - PNG_tEXt; -#endif -#ifdef PNG_READ_tIME_SUPPORTED - PNG_tIME; -#endif -#ifdef PNG_READ_tRNS_SUPPORTED - PNG_tRNS; -#endif -#ifdef PNG_READ_zTXt_SUPPORTED - PNG_zTXt; -#endif png_uint_32 length = png_read_chunk_header(png_ptr); - PNG_CONST png_bytep chunk_name = png_ptr->chunk_name; + png_uint_32 chunk_name = png_ptr->chunk_name; - if (!png_memcmp(chunk_name, png_IHDR, 4)) + if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); - else if (!png_memcmp(chunk_name, png_IEND, 4)) + else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_handle_as_unknown(png_ptr, chunk_name)) + else if (png_chunk_unknown_handling(png_ptr, chunk_name) != + PNG_HANDLE_CHUNK_AS_DEFAULT) { - if (!png_memcmp(chunk_name, png_IDAT, 4)) + if (chunk_name == png_IDAT) { if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_benign_error(png_ptr, "Too many IDATs found"); } png_handle_unknown(png_ptr, info_ptr, length); - if (!png_memcmp(chunk_name, png_PLTE, 4)) + if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; } #endif - else if (!png_memcmp(chunk_name, png_IDAT, 4)) + else if (chunk_name == png_IDAT) { /* Zero length IDATs are legal after the last IDAT has been * read, but not after other chunks have been read. @@ -985,91 +844,91 @@ png_read_end(png_structp png_ptr, png_infop info_ptr) png_crc_finish(png_ptr, length); } - else if (!png_memcmp(chunk_name, png_PLTE, 4)) + else if (chunk_name == png_PLTE) png_handle_PLTE(png_ptr, info_ptr, length); #ifdef PNG_READ_bKGD_SUPPORTED - else if (!png_memcmp(chunk_name, png_bKGD, 4)) + else if (chunk_name == png_bKGD) png_handle_bKGD(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_cHRM_SUPPORTED - else if (!png_memcmp(chunk_name, png_cHRM, 4)) + else if (chunk_name == png_cHRM) png_handle_cHRM(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_gAMA_SUPPORTED - else if (!png_memcmp(chunk_name, png_gAMA, 4)) + else if (chunk_name == png_gAMA) png_handle_gAMA(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_hIST_SUPPORTED - else if (!png_memcmp(chunk_name, png_hIST, 4)) + else if (chunk_name == png_hIST) png_handle_hIST(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_oFFs_SUPPORTED - else if (!png_memcmp(chunk_name, png_oFFs, 4)) + else if (chunk_name == png_oFFs) png_handle_oFFs(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_pCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_pCAL, 4)) + else if (chunk_name == png_pCAL) png_handle_pCAL(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sCAL_SUPPORTED - else if (!png_memcmp(chunk_name, png_sCAL, 4)) + else if (chunk_name == png_sCAL) png_handle_sCAL(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_pHYs_SUPPORTED - else if (!png_memcmp(chunk_name, png_pHYs, 4)) + else if (chunk_name == png_pHYs) png_handle_pHYs(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sBIT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sBIT, 4)) + else if (chunk_name == png_sBIT) png_handle_sBIT(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sRGB_SUPPORTED - else if (!png_memcmp(chunk_name, png_sRGB, 4)) + else if (chunk_name == png_sRGB) png_handle_sRGB(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_iCCP_SUPPORTED - else if (!png_memcmp(chunk_name, png_iCCP, 4)) + else if (chunk_name == png_iCCP) png_handle_iCCP(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_sPLT_SUPPORTED - else if (!png_memcmp(chunk_name, png_sPLT, 4)) + else if (chunk_name == png_sPLT) png_handle_sPLT(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tEXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_tEXt, 4)) + else if (chunk_name == png_tEXt) png_handle_tEXt(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tIME_SUPPORTED - else if (!png_memcmp(chunk_name, png_tIME, 4)) + else if (chunk_name == png_tIME) png_handle_tIME(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_tRNS_SUPPORTED - else if (!png_memcmp(chunk_name, png_tRNS, 4)) + else if (chunk_name == png_tRNS) png_handle_tRNS(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_zTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_zTXt, 4)) + else if (chunk_name == png_zTXt) png_handle_zTXt(png_ptr, info_ptr, length); #endif #ifdef PNG_READ_iTXt_SUPPORTED - else if (!png_memcmp(chunk_name, png_iTXt, 4)) + else if (chunk_name == png_iTXt) png_handle_iTXt(png_ptr, info_ptr, length); #endif @@ -1161,7 +1020,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, jmp_buf tmp_jmp; #endif png_error_ptr error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_error_ptr warning_fn; +#endif png_voidp error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_free_ptr free_fn; @@ -1175,9 +1036,13 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, if (end_info_ptr != NULL) png_info_destroy(png_ptr, end_info_ptr); +#ifdef PNG_READ_GAMMA_SUPPORTED + png_destroy_gamma_table(png_ptr); +#endif + png_free(png_ptr, png_ptr->zbuf); png_free(png_ptr, png_ptr->big_row_buf); - png_free(png_ptr, png_ptr->prev_row); + png_free(png_ptr, png_ptr->big_prev_row); png_free(png_ptr, png_ptr->chunkdata); #ifdef PNG_READ_QUANTIZE_SUPPORTED @@ -1185,15 +1050,6 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_free(png_ptr, png_ptr->quantize_index); #endif -#ifdef PNG_READ_GAMMA_SUPPORTED - png_free(png_ptr, png_ptr->gamma_table); -#endif - -#ifdef PNG_READ_BACKGROUND_SUPPORTED - png_free(png_ptr, png_ptr->gamma_from_1); - png_free(png_ptr, png_ptr->gamma_to_1); -#endif - if (png_ptr->free_me & PNG_FREE_PLTE) png_zfree(png_ptr, png_ptr->palette); png_ptr->free_me &= ~PNG_FREE_PLTE; @@ -1211,67 +1067,23 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_ptr->free_me &= ~PNG_FREE_HIST; #endif -#ifdef PNG_READ_GAMMA_SUPPORTED - if (png_ptr->gamma_16_table != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_table[i]); - } - png_free(png_ptr, png_ptr->gamma_16_table); - } - -#ifdef PNG_READ_BACKGROUND_SUPPORTED - if (png_ptr->gamma_16_from_1 != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_from_1[i]); - } - png_free(png_ptr, png_ptr->gamma_16_from_1); - } - if (png_ptr->gamma_16_to_1 != NULL) - { - int i; - int istop = (1 << (8 - png_ptr->gamma_shift)); - for (i = 0; i < istop; i++) - { - png_free(png_ptr, png_ptr->gamma_16_to_1[i]); - } - png_free(png_ptr, png_ptr->gamma_16_to_1); - } -#endif -#endif - -#ifdef PNG_TIME_RFC1123_SUPPORTED - png_free(png_ptr, png_ptr->time_buffer); -#endif - inflateEnd(&png_ptr->zstream); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_free(png_ptr, png_ptr->save_buffer); #endif -#ifdef PNG_PROGRESSIVE_READ_SUPPORTED -#ifdef PNG_TEXT_SUPPORTED - png_free(png_ptr, png_ptr->current_text); -#endif /* PNG_TEXT_SUPPORTED */ -#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ - /* Save the important info out of the png_struct, in case it is * being used again. */ #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(tmp_jmp, png_ptr->png_jmpbuf, png_sizeof(jmp_buf)); + png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); #endif error_fn = png_ptr->error_fn; +#ifdef PNG_WARNINGS_SUPPORTED warning_fn = png_ptr->warning_fn; +#endif error_ptr = png_ptr->error_ptr; #ifdef PNG_USER_MEM_SUPPORTED free_fn = png_ptr->free_fn; @@ -1280,14 +1092,16 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_memset(png_ptr, 0, png_sizeof(png_struct)); png_ptr->error_fn = error_fn; +#ifdef PNG_WARNINGS_SUPPORTED png_ptr->warning_fn = warning_fn; +#endif png_ptr->error_ptr = error_ptr; #ifdef PNG_USER_MEM_SUPPORTED png_ptr->free_fn = free_fn; #endif #ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->png_jmpbuf, tmp_jmp, png_sizeof(jmp_buf)); + png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); #endif } @@ -1311,7 +1125,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, { int row; - if (png_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL) return; /* png_read_info() gives us all of the information from the @@ -1323,8 +1137,22 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, /* -------------- image transformations start here ------------------- */ -#ifdef PNG_READ_16_TO_8_SUPPORTED - /* Tell libpng to strip 16 bit/color files down to 8 bits per color. +#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. + */ + png_set_scale_16(png_ptr); + } +#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) png_set_strip_16(png_ptr); @@ -1405,7 +1233,7 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, #endif #ifdef PNG_READ_SWAP_SUPPORTED - /* Swap bytes of 16 bit files to least significant byte first */ + /* Swap bytes of 16-bit files to least significant byte first */ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN) png_set_swap(png_ptr); #endif @@ -1424,8 +1252,19 @@ png_read_png(png_structp png_ptr, png_infop info_ptr, png_set_gray_to_rgb(png_ptr); #endif +/* Added at libpng-1.5.4 */ +#ifdef PNG_READ_EXPAND_16_SUPPORTED + if (transforms & PNG_TRANSFORM_EXPAND_16) + png_set_expand_16(png_ptr); +#endif + /* We don't handle adding filler bytes */ + /* We use png_read_image and rely on that for interlace handling, but we also + * call png_read_update_info therefore must turn on interlace handling now: + */ + (void)png_set_interlace_handling(png_ptr); + /* Optional call to gamma correct and add the background to the palette * and update info structure. REQUIRED if you are expecting libpng to * update the palette for you (i.e., you selected such a transform above). |