From 023ddf39ba5ef44cc5ef1084206f8c3eb482bef4 Mon Sep 17 00:00:00 2001 From: Michael R Sweet Date: Sat, 1 Mar 2008 06:37:33 +0000 Subject: Update libpng to 1.2.26. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@6060 ea41ed52-d2ee-0310-a9c1-e6b18d33e121 --- png/pngpread.c | 235 +++++++++++++++++++++++++++++---------------------------- 1 file changed, 121 insertions(+), 114 deletions(-) (limited to 'png/pngpread.c') diff --git a/png/pngpread.c b/png/pngpread.c index d226c75d3..a02cdfcb2 100644 --- a/png/pngpread.c +++ b/png/pngpread.c @@ -1,9 +1,9 @@ /* pngpread.c - read a png file in push mode * - * Last changed in libpng 1.2.13 November 13, 2006 + * Last changed in libpng 1.2.25 [February 18, 2008] * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2006 Glenn Randers-Pehrson + * Copyright (c) 1998-2008 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.) */ @@ -28,7 +28,7 @@ void PNGAPI png_process_data(png_structp png_ptr, png_infop info_ptr, png_bytep buffer, png_size_t buffer_size) { - if(png_ptr == NULL) return; + if(png_ptr == NULL || info_ptr == NULL) return; png_push_restore_buffer(png_ptr, buffer, buffer_size); while (png_ptr->buffer_size) @@ -137,60 +137,60 @@ void /* PRIVATE */ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) { #ifdef PNG_USE_LOCAL_ARRAYS - PNG_IHDR; - PNG_IDAT; - PNG_IEND; - PNG_PLTE; + PNG_CONST PNG_IHDR; + PNG_CONST PNG_IDAT; + PNG_CONST PNG_IEND; + PNG_CONST PNG_PLTE; #if defined(PNG_READ_bKGD_SUPPORTED) - PNG_bKGD; + PNG_CONST PNG_bKGD; #endif #if defined(PNG_READ_cHRM_SUPPORTED) - PNG_cHRM; + PNG_CONST PNG_cHRM; #endif #if defined(PNG_READ_gAMA_SUPPORTED) - PNG_gAMA; + PNG_CONST PNG_gAMA; #endif #if defined(PNG_READ_hIST_SUPPORTED) - PNG_hIST; + PNG_CONST PNG_hIST; #endif #if defined(PNG_READ_iCCP_SUPPORTED) - PNG_iCCP; + PNG_CONST PNG_iCCP; #endif #if defined(PNG_READ_iTXt_SUPPORTED) - PNG_iTXt; + PNG_CONST PNG_iTXt; #endif #if defined(PNG_READ_oFFs_SUPPORTED) - PNG_oFFs; + PNG_CONST PNG_oFFs; #endif #if defined(PNG_READ_pCAL_SUPPORTED) - PNG_pCAL; + PNG_CONST PNG_pCAL; #endif #if defined(PNG_READ_pHYs_SUPPORTED) - PNG_pHYs; + PNG_CONST PNG_pHYs; #endif #if defined(PNG_READ_sBIT_SUPPORTED) - PNG_sBIT; + PNG_CONST PNG_sBIT; #endif #if defined(PNG_READ_sCAL_SUPPORTED) - PNG_sCAL; + PNG_CONST PNG_sCAL; #endif #if defined(PNG_READ_sRGB_SUPPORTED) - PNG_sRGB; + PNG_CONST PNG_sRGB; #endif #if defined(PNG_READ_sPLT_SUPPORTED) - PNG_sPLT; + PNG_CONST PNG_sPLT; #endif #if defined(PNG_READ_tEXt_SUPPORTED) - PNG_tEXt; + PNG_CONST PNG_tEXt; #endif #if defined(PNG_READ_tIME_SUPPORTED) - PNG_tIME; + PNG_CONST PNG_tIME; #endif #if defined(PNG_READ_tRNS_SUPPORTED) - PNG_tRNS; + PNG_CONST PNG_tRNS; #endif #if defined(PNG_READ_zTXt_SUPPORTED) - PNG_zTXt; + PNG_CONST PNG_zTXt; #endif #endif /* PNG_USE_LOCAL_ARRAYS */ /* First we make sure we have enough data for the 4 byte chunk name @@ -216,7 +216,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; } - if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4)) + if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) if(png_ptr->mode & PNG_AFTER_IDAT) png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; @@ -273,7 +273,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) } png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length); } - else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4)) + else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) { /* If we reach an IDAT chunk, this means we have read all of the * header chunks, and we can start reading the image (or if this @@ -660,7 +660,7 @@ void /* PRIVATE */ png_push_read_IDAT(png_structp png_ptr) { #ifdef PNG_USE_LOCAL_ARRAYS - PNG_IDAT; + PNG_CONST PNG_IDAT; #endif if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) { @@ -678,7 +678,7 @@ png_push_read_IDAT(png_structp png_ptr) png_crc_read(png_ptr, png_ptr->chunk_name, 4); png_ptr->mode |= PNG_HAVE_CHUNK_HEADER; - if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4)) + if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) { png_ptr->process_mode = PNG_READ_CHUNK_MODE; if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) @@ -990,25 +990,20 @@ png_read_push_finish_row(png_structp png_ptr) /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* start of interlace block */ - const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; + PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; /* offset to next interlace block */ - const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; + PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; /* start of interlace block in the y direction */ - const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; + PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; /* offset to next interlace block in the y direction */ - const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; - - /* Width of interlace block. This is not currently used - if you need - * it, uncomment it here and in png.h - const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; - */ + PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; /* Height of interlace block. This is not currently used - if you need * it, uncomment it here and in png.h - const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; + PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; */ #endif @@ -1023,32 +1018,37 @@ png_read_push_finish_row(png_structp png_ptr) png_ptr->rowbytes + 1); do { - png_ptr->pass++; - if ((png_ptr->pass == 1 && png_ptr->width < 5) || - (png_ptr->pass == 3 && png_ptr->width < 3) || - (png_ptr->pass == 5 && png_ptr->width < 2)) - png_ptr->pass++; - - if (png_ptr->pass > 7) - png_ptr->pass--; - if (png_ptr->pass >= 7) - break; - - 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]; - - png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, - png_ptr->iwidth) + 1; - - if (png_ptr->transformations & PNG_INTERLACE) - break; - - png_ptr->num_rows = (png_ptr->height + - png_pass_yinc[png_ptr->pass] - 1 - - png_pass_ystart[png_ptr->pass]) / - png_pass_yinc[png_ptr->pass]; + int pass; + pass = png_ptr->pass; + pass++; + if ((pass == 1 && png_ptr->width < 5) || + (pass == 3 && png_ptr->width < 3) || + (pass == 5 && png_ptr->width < 2)) + pass++; + + if (pass > 7) + pass--; + png_ptr->pass = (png_byte) pass; + if (pass < 7) + { + png_ptr->iwidth = (png_ptr->width + + png_pass_inc[pass] - 1 - + png_pass_start[pass]) / + png_pass_inc[pass]; + + png_ptr->irowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1; + + if (png_ptr->transformations & PNG_INTERLACE) + break; + + png_ptr->num_rows = (png_ptr->height + + png_pass_yinc[pass] - 1 - + png_pass_ystart[pass]) / + png_pass_yinc[pass]; + } + else + break; } while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0); } @@ -1062,8 +1062,7 @@ png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) { png_error(png_ptr, "Out of place tEXt"); - /* to quiet some compiler warnings */ - if(info_ptr == NULL) return; + info_ptr = info_ptr; /* to quiet some compiler warnings */ } #ifdef PNG_MAX_MALLOC_64K @@ -1126,7 +1125,7 @@ png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr) for (text = key; *text; text++) /* empty loop */ ; - if (text != key + png_ptr->current_text_size) + if (text < key + png_ptr->current_text_size) text++; text_ptr = (png_textp)png_malloc(png_ptr, @@ -1159,8 +1158,7 @@ png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) { png_error(png_ptr, "Out of place zTXt"); - /* to quiet some compiler warnings */ - if(info_ptr == NULL) return; + info_ptr = info_ptr; /* to quiet some compiler warnings */ } #ifdef PNG_MAX_MALLOC_64K @@ -1222,7 +1220,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr) /* empty loop */ ; /* zTXt can't have zero text */ - if (text == key + png_ptr->current_text_size) + if (text >= key + png_ptr->current_text_size) { png_ptr->current_text = NULL; png_free(png_ptr, key); @@ -1352,8 +1350,7 @@ png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND)) { png_error(png_ptr, "Out of place iTXt"); - /* to quiet some compiler warnings */ - if(info_ptr == NULL) return; + info_ptr = info_ptr; /* to quiet some compiler warnings */ } #ifdef PNG_MAX_MALLOC_64K @@ -1420,7 +1417,7 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) for (lang = key; *lang; lang++) /* empty loop */ ; - if (lang != key + png_ptr->current_text_size) + if (lang < key + png_ptr->current_text_size - 3) lang++; comp_flag = *lang++; @@ -1430,10 +1427,14 @@ png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr) /* empty loop */ ; lang_key++; /* skip NUL separator */ - for (text = lang_key; *text; text++) - /* empty loop */ ; + text=lang_key; + if (lang_key < key + png_ptr->current_text_size - 1) + { + for (; *text; text++) + /* empty loop */ ; + } - if (text != key + png_ptr->current_text_size) + if (text < key + png_ptr->current_text_size) text++; text_ptr = (png_textp)png_malloc(png_ptr, @@ -1471,55 +1472,61 @@ png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 if (!(png_ptr->chunk_name[0] & 0x20)) { #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) - if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS + if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) - && png_ptr->read_user_chunk_fn == NULL + && png_ptr->read_user_chunk_fn == NULL #endif - ) + ) #endif - png_chunk_error(png_ptr, "unknown critical chunk"); + png_chunk_error(png_ptr, "unknown critical chunk"); - /* to quiet compiler warnings about unused info_ptr */ - if (info_ptr == NULL) - return; + info_ptr = info_ptr; /* to quiet some compiler warnings */ } #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) { - png_unknown_chunk chunk; - #ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "unknown chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } + if (length > (png_uint_32)65535L) + { + png_warning(png_ptr, "unknown chunk too large to fit in memory"); + skip = length - (png_uint_32)65535L; + length = (png_uint_32)65535L; + } #endif - - png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name); - chunk.data = (png_bytep)png_malloc(png_ptr, length); - png_crc_read(png_ptr, chunk.data, length); - chunk.size = length; + png_memcpy((png_charp)png_ptr->unknown_chunk.name, + (png_charp)png_ptr->chunk_name, + png_sizeof(png_ptr->unknown_chunk.name)); + png_ptr->unknown_chunk.name[png_sizeof(png_ptr->unknown_chunk.name)-1]='\0'; + + png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length); + png_ptr->unknown_chunk.size = (png_size_t)length; + png_crc_read(png_ptr, (png_bytep)png_ptr->unknown_chunk.data, length); #if defined(PNG_READ_USER_CHUNKS_SUPPORTED) - if(png_ptr->read_user_chunk_fn != NULL) - { - /* callback to user unknown chunk handler */ - if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0) - { - if (!(png_ptr->chunk_name[0] & 0x20)) - if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS) - png_chunk_error(png_ptr, "unknown critical chunk"); - } - png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1); - } - else + if(png_ptr->read_user_chunk_fn != NULL) + { + /* callback to user unknown chunk handler */ + int ret; + ret = (*(png_ptr->read_user_chunk_fn)) + (png_ptr, &png_ptr->unknown_chunk); + if (ret < 0) + png_chunk_error(png_ptr, "error in user chunk"); + if (ret == 0) + { + if (!(png_ptr->chunk_name[0] & 0x20)) + if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) != + PNG_HANDLE_CHUNK_ALWAYS) + png_chunk_error(png_ptr, "unknown critical chunk"); + png_set_unknown_chunks(png_ptr, info_ptr, + &png_ptr->unknown_chunk, 1); + } + } + else #endif - png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1); - png_free(png_ptr, chunk.data); + png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; } else #endif @@ -1553,11 +1560,11 @@ void PNGAPI png_progressive_combine_row (png_structp png_ptr, png_bytep old_row, png_bytep new_row) { - if(png_ptr == NULL) return; #ifdef PNG_USE_LOCAL_ARRAYS - const int FARDATA png_pass_dsp_mask[7] = + PNG_CONST int FARDATA png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; #endif + if(png_ptr == NULL) return; if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */ png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]); } -- cgit v1.2.3