X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c801d85f158c4cba50b588807daabdcbd0ed3853..914073189107fb2f0f4f78d7c98fbcc37c700d50:/src/png/png.c diff --git a/src/png/png.c b/src/png/png.c index 127b47b68f..2bbc22df7b 100644 --- a/src/png/png.c +++ b/src/png/png.c @@ -1,92 +1,103 @@ /* png.c - location for general purpose libpng functions * - * libpng 1.0.1 + * Last changed in libpng 1.2.19 August 19, 2007 * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. - * Copyright (c) 1996, 1997 Andreas Dilger - * Copyright (c) 1998, Glenn Randers-Pehrson - * March 15, 1998 + * Copyright (c) 1998-2007 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.) */ #define PNG_INTERNAL #define PNG_NO_EXTERN #include "png.h" +/* Generate a compiler error if there is an old png.h in the search path. */ +typedef version_1_2_20 Your_png_h_is_not_version_1_2_20; + /* Version information for C files. This had better match the version - * string defined in png.h. - */ -char png_libpng_ver[12] = "1.0.1"; + * string defined in png.h. */ -/* Place to hold the signature string for a PNG file. */ -png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; +#ifdef PNG_USE_GLOBAL_ARRAYS +/* png_libpng_ver was changed to a function in version 1.0.5c */ +PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; -/* Constant strings for known chunk types. If you need to add a chunk, - * add a string holding the name here. If you want to make the code - * portable to EBCDIC machines, use ASCII numbers, not characters. - */ -png_byte FARDATA png_IHDR[5] = { 73, 72, 68, 82, '\0'}; -png_byte FARDATA png_IDAT[5] = { 73, 68, 65, 84, '\0'}; -png_byte FARDATA png_IEND[5] = { 73, 69, 78, 68, '\0'}; -png_byte FARDATA png_PLTE[5] = { 80, 76, 84, 69, '\0'}; -png_byte FARDATA png_bKGD[5] = { 98, 75, 71, 68, '\0'}; -png_byte FARDATA png_cHRM[5] = { 99, 72, 82, 77, '\0'}; -png_byte FARDATA png_gAMA[5] = {103, 65, 77, 65, '\0'}; -png_byte FARDATA png_hIST[5] = {104, 73, 83, 84, '\0'}; -png_byte FARDATA png_oFFs[5] = {111, 70, 70, 115, '\0'}; -png_byte FARDATA png_pCAL[5] = {112, 67, 65, 76, '\0'}; -png_byte FARDATA png_pHYs[5] = {112, 72, 89, 115, '\0'}; -png_byte FARDATA png_sBIT[5] = {115, 66, 73, 84, '\0'}; -png_byte FARDATA png_sRGB[5] = {115, 82, 71, 66, '\0'}; -png_byte FARDATA png_tEXt[5] = {116, 69, 88, 116, '\0'}; -png_byte FARDATA png_tIME[5] = {116, 73, 77, 69, '\0'}; -png_byte FARDATA png_tRNS[5] = {116, 82, 78, 83, '\0'}; -png_byte FARDATA png_zTXt[5] = {122, 84, 88, 116, '\0'}; +#ifdef PNG_READ_SUPPORTED +/* png_sig was changed to a function in version 1.0.5c */ +/* Place to hold the signature string for a PNG file. */ +PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; +#endif /* PNG_READ_SUPPORTED */ + +/* Invoke global declarations for constant strings for known chunk types */ +PNG_IHDR; +PNG_IDAT; +PNG_IEND; +PNG_PLTE; +PNG_bKGD; +PNG_cHRM; +PNG_gAMA; +PNG_hIST; +PNG_iCCP; +PNG_iTXt; +PNG_oFFs; +PNG_pCAL; +PNG_sCAL; +PNG_pHYs; +PNG_sBIT; +PNG_sPLT; +PNG_sRGB; +PNG_tEXt; +PNG_tIME; +PNG_tRNS; +PNG_zTXt; + +#ifdef PNG_READ_SUPPORTED /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* start of interlace block */ -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 */ -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 */ -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 */ -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 -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 -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}; */ /* Mask to determine which pixels are valid in a pass */ -int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; +PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; /* Mask to determine which pixels to overwrite while displaying */ -int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; +PNG_CONST int FARDATA png_pass_dsp_mask[] + = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; +#endif /* PNG_READ_SUPPORTED */ +#endif /* PNG_USE_GLOBAL_ARRAYS */ /* Tells libpng that we have already handled the first "num_bytes" bytes * of the PNG file signature. If the PNG data is embedded into another * stream we can set num_bytes = 8 so that libpng will not attempt to read * or write any of the magic bytes before it starts on the IHDR. */ -void + +#ifdef PNG_READ_SUPPORTED +void PNGAPI png_set_sig_bytes(png_structp png_ptr, int num_bytes) { + if(png_ptr == NULL) return; png_debug(1, "in png_set_sig_bytes\n"); if (num_bytes > 8) png_error(png_ptr, "Too many bytes for PNG signature."); - png_ptr->sig_bytes = num_bytes < 0 ? 0 : num_bytes; + png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); } /* Checks whether the supplied bytes match the PNG signature. We allow @@ -97,43 +108,68 @@ png_set_sig_bytes(png_structp png_ptr, int num_bytes) * respectively, to be less than, to match, or be greater than the correct * PNG signature (this is the same behaviour as strcmp, memcmp, etc). */ -int +int PNGAPI png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) { + png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; if (num_to_check > 8) num_to_check = 8; else if (num_to_check < 1) - return (0); + return (-1); if (start > 7) - return (0); + return (-1); if (start + num_to_check > 8) num_to_check = 8 - start; - return ((int)(png_memcmp(&sig[start], &png_sig[start], num_to_check))); + return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); } +#if defined(PNG_1_0_X) || defined(PNG_1_2_X) /* (Obsolete) function to check signature bytes. It does not allow one - * to check a partial signature. This function will be removed in the - * future - use png_sig_cmp(). + * to check a partial signature. This function might be removed in the + * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG. */ -int +int PNGAPI png_check_sig(png_bytep sig, int num) { return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); } - -/* Function to allocate memory for zlib. */ -voidpf +#endif +#endif /* PNG_READ_SUPPORTED */ + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +/* Function to allocate memory for zlib and clear it to 0. */ +#ifdef PNG_1_0_X +voidpf PNGAPI +#else +voidpf /* private */ +#endif png_zalloc(voidpf png_ptr, uInt items, uInt size) { png_voidp ptr; + png_structp p=(png_structp)png_ptr; + png_uint_32 save_flags=p->flags; png_uint_32 num_bytes; + if(png_ptr == NULL) return (NULL); + if (items > PNG_UINT_32_MAX/size) + { + png_warning (p, "Potential overflow in png_zalloc()"); + return (NULL); + } num_bytes = (png_uint_32)items * size; + + p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); - if (num_bytes > (png_uint_32)0x8000) + p->flags=save_flags; + +#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) + if (ptr == NULL) + return ((voidpf)ptr); + + if (num_bytes > (png_uint_32)0x8000L) { png_memset(ptr, 0, (png_size_t)0x8000L); png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, @@ -143,11 +179,16 @@ png_zalloc(voidpf png_ptr, uInt items, uInt size) { png_memset(ptr, 0, (png_size_t)num_bytes); } +#endif return ((voidpf)ptr); } /* function to free memory for zlib */ -void +#ifdef PNG_1_0_X +void PNGAPI +#else +void /* private */ +#endif png_zfree(voidpf png_ptr, voidpf ptr) { png_free((png_structp)png_ptr, (png_voidp)ptr); @@ -156,7 +197,7 @@ png_zfree(voidpf png_ptr, voidpf ptr) /* Reset the CRC variable to 32 bits of 1's. Care must be taken * in case CRC is > 32 bits to leave the top bits 0. */ -void +void /* PRIVATE */ png_reset_crc(png_structp png_ptr) { png_ptr->crc = crc32(0, Z_NULL, 0); @@ -167,7 +208,7 @@ png_reset_crc(png_structp png_ptr) * also check that this data will actually be used before going to the * trouble of calculating it. */ -void +void /* PRIVATE */ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) { int need_crc = 1; @@ -190,21 +231,25 @@ png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) /* Allocate the memory for an info_struct for the application. We don't * really need the png_ptr, but it could potentially be useful in the - * future. This should be used in favour of malloc(sizeof(png_info)) + * future. This should be used in favour of malloc(png_sizeof(png_info)) * and png_info_init() so that applications that want to use a shared * libpng don't have to be recompiled if png_info changes size. */ -png_infop +png_infop PNGAPI png_create_info_struct(png_structp png_ptr) { png_infop info_ptr; png_debug(1, "in png_create_info_struct\n"); if(png_ptr == NULL) return (NULL); - if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL) - { - png_info_init(info_ptr); - } +#ifdef PNG_USER_MEM_SUPPORTED + info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, + png_ptr->malloc_fn, png_ptr->mem_ptr); +#else + info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); +#endif + if (info_ptr != NULL) + png_info_init_3(&info_ptr, png_sizeof(png_info)); return (info_ptr); } @@ -214,10 +259,11 @@ png_create_info_struct(png_structp png_ptr) * png_destroy_write_struct() to free an info struct, but this may be * useful for some applications. */ -void +void PNGAPI png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) { png_infop info_ptr = NULL; + if(png_ptr == NULL) return; png_debug(1, "in png_destroy_info_struct\n"); if (info_ptr_ptr != NULL) @@ -227,8 +273,13 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) { png_info_destroy(png_ptr, info_ptr); +#ifdef PNG_USER_MEM_SUPPORTED + png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, + png_ptr->mem_ptr); +#else png_destroy_struct((png_voidp)info_ptr); - *info_ptr_ptr = (png_infop)NULL; +#endif + *info_ptr_ptr = NULL; } } @@ -236,69 +287,512 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) * and applications using it are urged to use png_create_info_struct() * instead. */ -void +#if defined(PNG_1_0_X) || defined(PNG_1_2_X) +#undef png_info_init +void PNGAPI png_info_init(png_infop info_ptr) { - png_debug(1, "in png_info_init\n"); + /* We only come here via pre-1.0.12-compiled applications */ + png_info_init_3(&info_ptr, 0); +} +#endif + +void PNGAPI +png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) +{ + png_infop info_ptr = *ptr_ptr; + + if(info_ptr == NULL) return; + + png_debug(1, "in png_info_init_3\n"); + + if(png_sizeof(png_info) > png_info_struct_size) + { + png_destroy_struct(info_ptr); + info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); + *ptr_ptr = info_ptr; + } + /* set everything to 0 */ - png_memset(info_ptr, 0, sizeof (png_info)); + png_memset(info_ptr, 0, png_sizeof (png_info)); } -/* This is an internal routine to free any memory that the info struct is - * pointing to before re-using it or freeing the struct itself. Recall - * that png_free() checks for NULL pointers for us. - */ -void -png_info_destroy(png_structp png_ptr, png_infop info_ptr) +#ifdef PNG_FREE_ME_SUPPORTED +void PNGAPI +png_data_freer(png_structp png_ptr, png_infop info_ptr, + int freer, png_uint_32 mask) { -#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED) - int i; + png_debug(1, "in png_data_freer\n"); + if (png_ptr == NULL || info_ptr == NULL) + return; + if(freer == PNG_DESTROY_WILL_FREE_DATA) + info_ptr->free_me |= mask; + else if(freer == PNG_USER_WILL_FREE_DATA) + info_ptr->free_me &= ~mask; + else + png_warning(png_ptr, + "Unknown freer parameter in png_data_freer."); +} +#endif - png_debug(1, "in png_info_destroy\n"); - if (info_ptr->text != NULL) +void PNGAPI +png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, + int num) +{ + png_debug(1, "in png_free_data\n"); + if (png_ptr == NULL || info_ptr == NULL) + return; + +#if defined(PNG_TEXT_SUPPORTED) +/* free text item num or (if num == -1) all text items */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) +#else +if (mask & PNG_FREE_TEXT) +#endif +{ + if (num != -1) { - for (i = 0; i < info_ptr->num_text; i++) - { - png_free(png_ptr, info_ptr->text[i].key); - } - png_free(png_ptr, info_ptr->text); + if (info_ptr->text && info_ptr->text[num].key) + { + png_free(png_ptr, info_ptr->text[num].key); + info_ptr->text[num].key = NULL; + } } + else + { + int i; + for (i = 0; i < info_ptr->num_text; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); + png_free(png_ptr, info_ptr->text); + info_ptr->text = NULL; + info_ptr->num_text=0; + } +} +#endif + +#if defined(PNG_tRNS_SUPPORTED) +/* free any tRNS entry */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) +#else +if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) +#endif +{ + png_free(png_ptr, info_ptr->trans); + info_ptr->valid &= ~PNG_INFO_tRNS; +#ifndef PNG_FREE_ME_SUPPORTED + png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; +#endif + info_ptr->trans = NULL; +} +#endif + +#if defined(PNG_sCAL_SUPPORTED) +/* free any sCAL entry */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) +#else +if (mask & PNG_FREE_SCAL) +#endif +{ +#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) + png_free(png_ptr, info_ptr->scal_s_width); + png_free(png_ptr, info_ptr->scal_s_height); + info_ptr->scal_s_width = NULL; + info_ptr->scal_s_height = NULL; +#endif + info_ptr->valid &= ~PNG_INFO_sCAL; +} +#endif + +#if defined(PNG_pCAL_SUPPORTED) +/* free any pCAL entry */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) +#else +if (mask & PNG_FREE_PCAL) #endif -#if defined(PNG_READ_pCAL_SUPPORTED) - png_free(png_ptr, info_ptr->pcal_purpose); - png_free(png_ptr, info_ptr->pcal_units); - if (info_ptr->pcal_params != NULL) +{ + png_free(png_ptr, info_ptr->pcal_purpose); + png_free(png_ptr, info_ptr->pcal_units); + info_ptr->pcal_purpose = NULL; + info_ptr->pcal_units = NULL; + if (info_ptr->pcal_params != NULL) + { + int i; + for (i = 0; i < (int)info_ptr->pcal_nparams; i++) + { + png_free(png_ptr, info_ptr->pcal_params[i]); + info_ptr->pcal_params[i]=NULL; + } + png_free(png_ptr, info_ptr->pcal_params); + info_ptr->pcal_params = NULL; + } + info_ptr->valid &= ~PNG_INFO_pCAL; +} +#endif + +#if defined(PNG_iCCP_SUPPORTED) +/* free any iCCP entry */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) +#else +if (mask & PNG_FREE_ICCP) +#endif +{ + png_free(png_ptr, info_ptr->iccp_name); + png_free(png_ptr, info_ptr->iccp_profile); + info_ptr->iccp_name = NULL; + info_ptr->iccp_profile = NULL; + info_ptr->valid &= ~PNG_INFO_iCCP; +} +#endif + +#if defined(PNG_sPLT_SUPPORTED) +/* free a given sPLT entry, or (if num == -1) all sPLT entries */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) +#else +if (mask & PNG_FREE_SPLT) +#endif +{ + if (num != -1) { - for (i = 0; i < (int)info_ptr->pcal_nparams; i++) + if(info_ptr->splt_palettes) { - png_free(png_ptr, info_ptr->pcal_params[i]); + png_free(png_ptr, info_ptr->splt_palettes[num].name); + png_free(png_ptr, info_ptr->splt_palettes[num].entries); + info_ptr->splt_palettes[num].name = NULL; + info_ptr->splt_palettes[num].entries = NULL; } - png_free(png_ptr, info_ptr->pcal_params); } + else + { + if(info_ptr->splt_palettes_num) + { + int i; + for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); + + png_free(png_ptr, info_ptr->splt_palettes); + info_ptr->splt_palettes = NULL; + info_ptr->splt_palettes_num = 0; + } + info_ptr->valid &= ~PNG_INFO_sPLT; + } +} #endif - png_info_init(info_ptr); +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) + if(png_ptr->unknown_chunk.data) + { + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + } +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) +#else +if (mask & PNG_FREE_UNKN) +#endif +{ + if (num != -1) + { + if(info_ptr->unknown_chunks) + { + png_free(png_ptr, info_ptr->unknown_chunks[num].data); + info_ptr->unknown_chunks[num].data = NULL; + } + } + else + { + int i; + + if(info_ptr->unknown_chunks_num) + { + for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); + + png_free(png_ptr, info_ptr->unknown_chunks); + info_ptr->unknown_chunks = NULL; + info_ptr->unknown_chunks_num = 0; + } + } +} +#endif + +#if defined(PNG_hIST_SUPPORTED) +/* free any hIST entry */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_HIST) & info_ptr->free_me) +#else +if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) +#endif +{ + png_free(png_ptr, info_ptr->hist); + info_ptr->hist = NULL; + info_ptr->valid &= ~PNG_INFO_hIST; +#ifndef PNG_FREE_ME_SUPPORTED + png_ptr->flags &= ~PNG_FLAG_FREE_HIST; +#endif +} +#endif + +/* free any PLTE entry that was internally allocated */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) +#else +if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) +#endif +{ + png_zfree(png_ptr, info_ptr->palette); + info_ptr->palette = NULL; + info_ptr->valid &= ~PNG_INFO_PLTE; +#ifndef PNG_FREE_ME_SUPPORTED + png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; +#endif + info_ptr->num_palette = 0; } +#if defined(PNG_INFO_IMAGE_SUPPORTED) +/* free any image bits attached to the info structure */ +#ifdef PNG_FREE_ME_SUPPORTED +if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) +#else +if (mask & PNG_FREE_ROWS) +#endif +{ + if(info_ptr->row_pointers) + { + int row; + for (row = 0; row < (int)info_ptr->height; row++) + { + png_free(png_ptr, info_ptr->row_pointers[row]); + info_ptr->row_pointers[row]=NULL; + } + png_free(png_ptr, info_ptr->row_pointers); + info_ptr->row_pointers=NULL; + } + info_ptr->valid &= ~PNG_INFO_IDAT; +} +#endif + +#ifdef PNG_FREE_ME_SUPPORTED + if(num == -1) + info_ptr->free_me &= ~mask; + else + info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); +#endif +} + +/* This is an internal routine to free any memory that the info struct is + * pointing to before re-using it or freeing the struct itself. Recall + * that png_free() checks for NULL pointers for us. + */ +void /* PRIVATE */ +png_info_destroy(png_structp png_ptr, png_infop info_ptr) +{ + png_debug(1, "in png_info_destroy\n"); + + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) + if (png_ptr->num_chunk_list) + { + png_free(png_ptr, png_ptr->chunk_list); + png_ptr->chunk_list=NULL; + png_ptr->num_chunk_list=0; + } +#endif + + png_info_init_3(&info_ptr, png_sizeof(png_info)); +} +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + /* This function returns a pointer to the io_ptr associated with the user * functions. The application should free any memory associated with this * pointer before png_write_destroy() or png_read_destroy() are called. */ -png_voidp +png_voidp PNGAPI png_get_io_ptr(png_structp png_ptr) { + if(png_ptr == NULL) return (NULL); return (png_ptr->io_ptr); } +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #if !defined(PNG_NO_STDIO) /* Initialize the default input/output functions for the PNG file. If you * use your own read or write routines, you can call either png_set_read_fn() - * or png_set_write_fn() instead of png_init_io(). + * or png_set_write_fn() instead of png_init_io(). If you have defined + * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't + * necessarily available. */ -void -png_init_io(png_structp png_ptr, FILE *fp) +void PNGAPI +png_init_io(png_structp png_ptr, png_FILE_p fp) { png_debug(1, "in png_init_io\n"); + if(png_ptr == NULL) return; png_ptr->io_ptr = (png_voidp)fp; } #endif + +#if defined(PNG_TIME_RFC1123_SUPPORTED) +/* Convert the supplied time into an RFC 1123 string suitable for use in + * a "Creation Time" or other text-based time string. + */ +png_charp PNGAPI +png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) +{ + static PNG_CONST char short_months[12][4] = + {"Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; + + if(png_ptr == NULL) return (NULL); + if (png_ptr->time_buffer == NULL) + { + png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* + png_sizeof(char))); + } + +#if defined(_WIN32_WCE) + { + wchar_t time_buf[29]; + wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), + ptime->day % 32, short_months[(ptime->month - 1) % 12], + ptime->year, ptime->hour % 24, ptime->minute % 60, + ptime->second % 61); + WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29, + NULL, NULL); + } +#else +#ifdef USE_FAR_KEYWORD + { + char near_time_buf[29]; + png_snprintf6(near_time_buf,29,"%d %s %d %02d:%02d:%02d +0000", + ptime->day % 32, short_months[(ptime->month - 1) % 12], + ptime->year, ptime->hour % 24, ptime->minute % 60, + ptime->second % 61); + png_memcpy(png_ptr->time_buffer, near_time_buf, + 29*png_sizeof(char)); + } +#else + png_snprintf6(png_ptr->time_buffer,29,"%d %s %d %02d:%02d:%02d +0000", + ptime->day % 32, short_months[(ptime->month - 1) % 12], + ptime->year, ptime->hour % 24, ptime->minute % 60, + ptime->second % 61); +#endif +#endif /* _WIN32_WCE */ + return ((png_charp)png_ptr->time_buffer); +} +#endif /* PNG_TIME_RFC1123_SUPPORTED */ + +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +png_charp PNGAPI +png_get_copyright(png_structp png_ptr) +{ + png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ + return ((png_charp) "\n libpng version 1.2.20 - September 8, 2007\n\ + Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\ + Copyright (c) 1996-1997 Andreas Dilger\n\ + Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); +} + +/* The following return the library version as a short string in the + * format 1.0.0 through 99.99.99zz. To get the version of *.h files + * used with your application, print out PNG_LIBPNG_VER_STRING, which + * is defined in png.h. + * Note: now there is no difference between png_get_libpng_ver() and + * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, + * it is guaranteed that png.c uses the correct version of png.h. + */ +png_charp PNGAPI +png_get_libpng_ver(png_structp png_ptr) +{ + /* Version of *.c files used when building libpng */ + png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ + return ((png_charp) PNG_LIBPNG_VER_STRING); +} + +png_charp PNGAPI +png_get_header_ver(png_structp png_ptr) +{ + /* Version of *.h files used when building libpng */ + png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ + return ((png_charp) PNG_LIBPNG_VER_STRING); +} + +png_charp PNGAPI +png_get_header_version(png_structp png_ptr) +{ + /* Returns longer string containing both version and date */ + png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ + return ((png_charp) PNG_HEADER_VERSION_STRING +#ifndef PNG_READ_SUPPORTED + " (NO READ SUPPORT)" +#endif + "\n"); +} + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +int PNGAPI +png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) +{ + /* check chunk_name and return "keep" value if it's on the list, else 0 */ + int i; + png_bytep p; + if(png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) + return 0; + p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5; + for (i = png_ptr->num_chunk_list; i; i--, p-=5) + if (!png_memcmp(chunk_name, p, 4)) + return ((int)*(p+4)); + return 0; +} +#endif + +/* This function, added to libpng-1.0.6g, is untested. */ +int PNGAPI +png_reset_zstream(png_structp png_ptr) +{ + if (png_ptr == NULL) return Z_STREAM_ERROR; + return (inflateReset(&png_ptr->zstream)); +} +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ + +/* This function was added to libpng-1.0.7 */ +png_uint_32 PNGAPI +png_access_version_number(void) +{ + /* Version of *.c files used when building libpng */ + return((png_uint_32) PNG_LIBPNG_VER); +} + + +#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) +#if !defined(PNG_1_0_X) +/* this function was added to libpng 1.2.0 */ +int PNGAPI +png_mmx_support(void) +{ + /* obsolete, to be removed from libpng-1.4.0 */ + return -1; +} +#endif /* PNG_1_0_X */ +#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */ + +#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +#ifdef PNG_SIZE_T +/* Added at libpng version 1.2.6 */ + PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); +png_size_t PNGAPI +png_convert_size(size_t size) +{ + if (size > (png_size_t)-1) + PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ + return ((png_size_t)size); +} +#endif /* PNG_SIZE_T */ +#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */