nuclear@26: nuclear@26: /* png.c - location for general purpose libpng functions nuclear@26: * nuclear@26: * Last changed in libpng 1.2.30 [August 15, 2008] nuclear@26: * For conditions of distribution and use, see copyright notice in png.h nuclear@26: * Copyright (c) 1998-2008 Glenn Randers-Pehrson nuclear@26: * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) nuclear@26: * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) nuclear@26: */ nuclear@26: nuclear@26: #define PNG_INTERNAL nuclear@26: #define PNG_NO_EXTERN nuclear@26: #include "png.h" nuclear@26: nuclear@26: /* Generate a compiler error if there is an old png.h in the search path. */ nuclear@26: typedef version_1_2_33 Your_png_h_is_not_version_1_2_33; nuclear@26: nuclear@26: /* Version information for C files. This had better match the version nuclear@26: * string defined in png.h. */ nuclear@26: nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS nuclear@26: /* png_libpng_ver was changed to a function in version 1.0.5c */ nuclear@26: PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING; nuclear@26: nuclear@26: #ifdef PNG_READ_SUPPORTED nuclear@26: nuclear@26: /* png_sig was changed to a function in version 1.0.5c */ nuclear@26: /* Place to hold the signature string for a PNG file. */ nuclear@26: PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; nuclear@26: #endif /* PNG_READ_SUPPORTED */ nuclear@26: nuclear@26: /* Invoke global declarations for constant strings for known chunk types */ nuclear@26: PNG_IHDR; nuclear@26: PNG_IDAT; nuclear@26: PNG_IEND; nuclear@26: PNG_PLTE; nuclear@26: PNG_bKGD; nuclear@26: PNG_cHRM; nuclear@26: PNG_gAMA; nuclear@26: PNG_hIST; nuclear@26: PNG_iCCP; nuclear@26: PNG_iTXt; nuclear@26: PNG_oFFs; nuclear@26: PNG_pCAL; nuclear@26: PNG_sCAL; nuclear@26: PNG_pHYs; nuclear@26: PNG_sBIT; nuclear@26: PNG_sPLT; nuclear@26: PNG_sRGB; nuclear@26: PNG_tEXt; nuclear@26: PNG_tIME; nuclear@26: PNG_tRNS; nuclear@26: PNG_zTXt; nuclear@26: nuclear@26: #ifdef PNG_READ_SUPPORTED nuclear@26: /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */ nuclear@26: nuclear@26: /* start of interlace block */ nuclear@26: PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; nuclear@26: nuclear@26: /* offset to next interlace block */ nuclear@26: PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; nuclear@26: nuclear@26: /* start of interlace block in the y direction */ nuclear@26: PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; nuclear@26: nuclear@26: /* offset to next interlace block in the y direction */ nuclear@26: PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; nuclear@26: nuclear@26: /* Height of interlace block. This is not currently used - if you need nuclear@26: * it, uncomment it here and in png.h nuclear@26: PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; nuclear@26: */ nuclear@26: nuclear@26: /* Mask to determine which pixels are valid in a pass */ nuclear@26: PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; nuclear@26: nuclear@26: /* Mask to determine which pixels to overwrite while displaying */ nuclear@26: PNG_CONST int FARDATA png_pass_dsp_mask[] nuclear@26: = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; nuclear@26: nuclear@26: #endif /* PNG_READ_SUPPORTED */ nuclear@26: #endif /* PNG_USE_GLOBAL_ARRAYS */ nuclear@26: nuclear@26: /* Tells libpng that we have already handled the first "num_bytes" bytes nuclear@26: * of the PNG file signature. If the PNG data is embedded into another nuclear@26: * stream we can set num_bytes = 8 so that libpng will not attempt to read nuclear@26: * or write any of the magic bytes before it starts on the IHDR. nuclear@26: */ nuclear@26: nuclear@26: #ifdef PNG_READ_SUPPORTED nuclear@26: void PNGAPI nuclear@26: png_set_sig_bytes(png_structp png_ptr, int num_bytes) nuclear@26: { nuclear@26: if (png_ptr == NULL) return; nuclear@26: png_debug(1, "in png_set_sig_bytes\n"); nuclear@26: if (num_bytes > 8) nuclear@26: png_error(png_ptr, "Too many bytes for PNG signature."); nuclear@26: nuclear@26: png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes); nuclear@26: } nuclear@26: nuclear@26: /* Checks whether the supplied bytes match the PNG signature. We allow nuclear@26: * checking less than the full 8-byte signature so that those apps that nuclear@26: * already read the first few bytes of a file to determine the file type nuclear@26: * can simply check the remaining bytes for extra assurance. Returns nuclear@26: * an integer less than, equal to, or greater than zero if sig is found, nuclear@26: * respectively, to be less than, to match, or be greater than the correct nuclear@26: * PNG signature (this is the same behaviour as strcmp, memcmp, etc). nuclear@26: */ nuclear@26: int PNGAPI nuclear@26: png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check) nuclear@26: { nuclear@26: png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; nuclear@26: if (num_to_check > 8) nuclear@26: num_to_check = 8; nuclear@26: else if (num_to_check < 1) nuclear@26: return (-1); nuclear@26: nuclear@26: if (start > 7) nuclear@26: return (-1); nuclear@26: nuclear@26: if (start + num_to_check > 8) nuclear@26: num_to_check = 8 - start; nuclear@26: nuclear@26: return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_1_0_X) || defined(PNG_1_2_X) nuclear@26: /* (Obsolete) function to check signature bytes. It does not allow one nuclear@26: * to check a partial signature. This function might be removed in the nuclear@26: * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG. nuclear@26: */ nuclear@26: int PNGAPI nuclear@26: png_check_sig(png_bytep sig, int num) nuclear@26: { nuclear@26: return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num)); nuclear@26: } nuclear@26: #endif nuclear@26: #endif /* PNG_READ_SUPPORTED */ nuclear@26: nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) nuclear@26: /* Function to allocate memory for zlib and clear it to 0. */ nuclear@26: #ifdef PNG_1_0_X nuclear@26: voidpf PNGAPI nuclear@26: #else nuclear@26: voidpf /* private */ nuclear@26: #endif nuclear@26: png_zalloc(voidpf png_ptr, uInt items, uInt size) nuclear@26: { nuclear@26: png_voidp ptr; nuclear@26: png_structp p=(png_structp)png_ptr; nuclear@26: png_uint_32 save_flags=p->flags; nuclear@26: png_uint_32 num_bytes; nuclear@26: nuclear@26: if (png_ptr == NULL) return (NULL); nuclear@26: if (items > PNG_UINT_32_MAX/size) nuclear@26: { nuclear@26: png_warning (p, "Potential overflow in png_zalloc()"); nuclear@26: return (NULL); nuclear@26: } nuclear@26: num_bytes = (png_uint_32)items * size; nuclear@26: nuclear@26: p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; nuclear@26: ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); nuclear@26: p->flags=save_flags; nuclear@26: nuclear@26: #if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO) nuclear@26: if (ptr == NULL) nuclear@26: return ((voidpf)ptr); nuclear@26: nuclear@26: if (num_bytes > (png_uint_32)0x8000L) nuclear@26: { nuclear@26: png_memset(ptr, 0, (png_size_t)0x8000L); nuclear@26: png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0, nuclear@26: (png_size_t)(num_bytes - (png_uint_32)0x8000L)); nuclear@26: } nuclear@26: else nuclear@26: { nuclear@26: png_memset(ptr, 0, (png_size_t)num_bytes); nuclear@26: } nuclear@26: #endif nuclear@26: return ((voidpf)ptr); nuclear@26: } nuclear@26: nuclear@26: /* function to free memory for zlib */ nuclear@26: #ifdef PNG_1_0_X nuclear@26: void PNGAPI nuclear@26: #else nuclear@26: void /* private */ nuclear@26: #endif nuclear@26: png_zfree(voidpf png_ptr, voidpf ptr) nuclear@26: { nuclear@26: png_free((png_structp)png_ptr, (png_voidp)ptr); nuclear@26: } nuclear@26: nuclear@26: /* Reset the CRC variable to 32 bits of 1's. Care must be taken nuclear@26: * in case CRC is > 32 bits to leave the top bits 0. nuclear@26: */ nuclear@26: void /* PRIVATE */ nuclear@26: png_reset_crc(png_structp png_ptr) nuclear@26: { nuclear@26: png_ptr->crc = crc32(0, Z_NULL, 0); nuclear@26: } nuclear@26: nuclear@26: /* Calculate the CRC over a section of data. We can only pass as nuclear@26: * much data to this routine as the largest single buffer size. We nuclear@26: * also check that this data will actually be used before going to the nuclear@26: * trouble of calculating it. nuclear@26: */ nuclear@26: void /* PRIVATE */ nuclear@26: png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) nuclear@26: { nuclear@26: int need_crc = 1; nuclear@26: nuclear@26: if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ nuclear@26: { nuclear@26: if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == nuclear@26: (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) nuclear@26: need_crc = 0; nuclear@26: } nuclear@26: else /* critical */ nuclear@26: { nuclear@26: if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) nuclear@26: need_crc = 0; nuclear@26: } nuclear@26: nuclear@26: if (need_crc) nuclear@26: png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length); nuclear@26: } nuclear@26: nuclear@26: /* Allocate the memory for an info_struct for the application. We don't nuclear@26: * really need the png_ptr, but it could potentially be useful in the nuclear@26: * future. This should be used in favour of malloc(png_sizeof(png_info)) nuclear@26: * and png_info_init() so that applications that want to use a shared nuclear@26: * libpng don't have to be recompiled if png_info changes size. nuclear@26: */ nuclear@26: png_infop PNGAPI nuclear@26: png_create_info_struct(png_structp png_ptr) nuclear@26: { nuclear@26: png_infop info_ptr; nuclear@26: nuclear@26: png_debug(1, "in png_create_info_struct\n"); nuclear@26: if (png_ptr == NULL) return (NULL); nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, nuclear@26: png_ptr->malloc_fn, png_ptr->mem_ptr); nuclear@26: #else nuclear@26: info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); nuclear@26: #endif nuclear@26: if (info_ptr != NULL) nuclear@26: png_info_init_3(&info_ptr, png_sizeof(png_info)); nuclear@26: nuclear@26: return (info_ptr); nuclear@26: } nuclear@26: nuclear@26: /* This function frees the memory associated with a single info struct. nuclear@26: * Normally, one would use either png_destroy_read_struct() or nuclear@26: * png_destroy_write_struct() to free an info struct, but this may be nuclear@26: * useful for some applications. nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) nuclear@26: { nuclear@26: png_infop info_ptr = NULL; nuclear@26: if (png_ptr == NULL) return; nuclear@26: nuclear@26: png_debug(1, "in png_destroy_info_struct\n"); nuclear@26: if (info_ptr_ptr != NULL) nuclear@26: info_ptr = *info_ptr_ptr; nuclear@26: nuclear@26: if (info_ptr != NULL) nuclear@26: { nuclear@26: png_info_destroy(png_ptr, info_ptr); nuclear@26: nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED nuclear@26: png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, nuclear@26: png_ptr->mem_ptr); nuclear@26: #else nuclear@26: png_destroy_struct((png_voidp)info_ptr); nuclear@26: #endif nuclear@26: *info_ptr_ptr = NULL; nuclear@26: } nuclear@26: } nuclear@26: nuclear@26: /* Initialize the info structure. This is now an internal function (0.89) nuclear@26: * and applications using it are urged to use png_create_info_struct() nuclear@26: * instead. nuclear@26: */ nuclear@26: #if defined(PNG_1_0_X) || defined(PNG_1_2_X) nuclear@26: #undef png_info_init nuclear@26: void PNGAPI nuclear@26: png_info_init(png_infop info_ptr) nuclear@26: { nuclear@26: /* We only come here via pre-1.0.12-compiled applications */ nuclear@26: png_info_init_3(&info_ptr, 0); nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) nuclear@26: { nuclear@26: png_infop info_ptr = *ptr_ptr; nuclear@26: nuclear@26: if (info_ptr == NULL) return; nuclear@26: nuclear@26: png_debug(1, "in png_info_init_3\n"); nuclear@26: nuclear@26: if (png_sizeof(png_info) > png_info_struct_size) nuclear@26: { nuclear@26: png_destroy_struct(info_ptr); nuclear@26: info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); nuclear@26: *ptr_ptr = info_ptr; nuclear@26: } nuclear@26: nuclear@26: /* set everything to 0 */ nuclear@26: png_memset(info_ptr, 0, png_sizeof(png_info)); nuclear@26: } nuclear@26: nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: void PNGAPI nuclear@26: png_data_freer(png_structp png_ptr, png_infop info_ptr, nuclear@26: int freer, png_uint_32 mask) nuclear@26: { nuclear@26: png_debug(1, "in png_data_freer\n"); nuclear@26: if (png_ptr == NULL || info_ptr == NULL) nuclear@26: return; nuclear@26: if (freer == PNG_DESTROY_WILL_FREE_DATA) nuclear@26: info_ptr->free_me |= mask; nuclear@26: else if (freer == PNG_USER_WILL_FREE_DATA) nuclear@26: info_ptr->free_me &= ~mask; nuclear@26: else nuclear@26: png_warning(png_ptr, nuclear@26: "Unknown freer parameter in png_data_freer."); nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: void PNGAPI nuclear@26: png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, nuclear@26: int num) nuclear@26: { nuclear@26: png_debug(1, "in png_free_data\n"); nuclear@26: if (png_ptr == NULL || info_ptr == NULL) nuclear@26: return; nuclear@26: nuclear@26: #if defined(PNG_TEXT_SUPPORTED) nuclear@26: /* free text item num or (if num == -1) all text items */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_TEXT) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_TEXT) nuclear@26: #endif nuclear@26: { nuclear@26: if (num != -1) nuclear@26: { nuclear@26: if (info_ptr->text && info_ptr->text[num].key) nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->text[num].key); nuclear@26: info_ptr->text[num].key = NULL; nuclear@26: } nuclear@26: } nuclear@26: else nuclear@26: { nuclear@26: int i; nuclear@26: for (i = 0; i < info_ptr->num_text; i++) nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i); nuclear@26: png_free(png_ptr, info_ptr->text); nuclear@26: info_ptr->text = NULL; nuclear@26: info_ptr->num_text=0; nuclear@26: } nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_tRNS_SUPPORTED) nuclear@26: /* free any tRNS entry */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_TRNS) & info_ptr->free_me) nuclear@26: #else nuclear@26: if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS)) nuclear@26: #endif nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->trans); nuclear@26: info_ptr->trans = NULL; nuclear@26: info_ptr->valid &= ~PNG_INFO_tRNS; nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_TRNS; nuclear@26: #endif nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_sCAL_SUPPORTED) nuclear@26: /* free any sCAL entry */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_SCAL) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_SCAL) nuclear@26: #endif nuclear@26: { nuclear@26: #if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED) nuclear@26: png_free(png_ptr, info_ptr->scal_s_width); nuclear@26: png_free(png_ptr, info_ptr->scal_s_height); nuclear@26: info_ptr->scal_s_width = NULL; nuclear@26: info_ptr->scal_s_height = NULL; nuclear@26: #endif nuclear@26: info_ptr->valid &= ~PNG_INFO_sCAL; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_pCAL_SUPPORTED) nuclear@26: /* free any pCAL entry */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_PCAL) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_PCAL) nuclear@26: #endif nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->pcal_purpose); nuclear@26: png_free(png_ptr, info_ptr->pcal_units); nuclear@26: info_ptr->pcal_purpose = NULL; nuclear@26: info_ptr->pcal_units = NULL; nuclear@26: if (info_ptr->pcal_params != NULL) nuclear@26: { nuclear@26: int i; nuclear@26: for (i = 0; i < (int)info_ptr->pcal_nparams; i++) nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->pcal_params[i]); nuclear@26: info_ptr->pcal_params[i]=NULL; nuclear@26: } nuclear@26: png_free(png_ptr, info_ptr->pcal_params); nuclear@26: info_ptr->pcal_params = NULL; nuclear@26: } nuclear@26: info_ptr->valid &= ~PNG_INFO_pCAL; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_iCCP_SUPPORTED) nuclear@26: /* free any iCCP entry */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_ICCP) nuclear@26: #endif nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->iccp_name); nuclear@26: png_free(png_ptr, info_ptr->iccp_profile); nuclear@26: info_ptr->iccp_name = NULL; nuclear@26: info_ptr->iccp_profile = NULL; nuclear@26: info_ptr->valid &= ~PNG_INFO_iCCP; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_sPLT_SUPPORTED) nuclear@26: /* free a given sPLT entry, or (if num == -1) all sPLT entries */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_SPLT) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_SPLT) nuclear@26: #endif nuclear@26: { nuclear@26: if (num != -1) nuclear@26: { nuclear@26: if (info_ptr->splt_palettes) nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->splt_palettes[num].name); nuclear@26: png_free(png_ptr, info_ptr->splt_palettes[num].entries); nuclear@26: info_ptr->splt_palettes[num].name = NULL; nuclear@26: info_ptr->splt_palettes[num].entries = NULL; nuclear@26: } nuclear@26: } nuclear@26: else nuclear@26: { nuclear@26: if (info_ptr->splt_palettes_num) nuclear@26: { nuclear@26: int i; nuclear@26: for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); nuclear@26: nuclear@26: png_free(png_ptr, info_ptr->splt_palettes); nuclear@26: info_ptr->splt_palettes = NULL; nuclear@26: info_ptr->splt_palettes_num = 0; nuclear@26: } nuclear@26: info_ptr->valid &= ~PNG_INFO_sPLT; nuclear@26: } nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) nuclear@26: if (png_ptr->unknown_chunk.data) nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->unknown_chunk.data); nuclear@26: png_ptr->unknown_chunk.data = NULL; nuclear@26: } nuclear@26: nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_UNKN) nuclear@26: #endif nuclear@26: { nuclear@26: if (num != -1) nuclear@26: { nuclear@26: if (info_ptr->unknown_chunks) nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->unknown_chunks[num].data); nuclear@26: info_ptr->unknown_chunks[num].data = NULL; nuclear@26: } nuclear@26: } nuclear@26: else nuclear@26: { nuclear@26: int i; nuclear@26: nuclear@26: if (info_ptr->unknown_chunks_num) nuclear@26: { nuclear@26: for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++) nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); nuclear@26: nuclear@26: png_free(png_ptr, info_ptr->unknown_chunks); nuclear@26: info_ptr->unknown_chunks = NULL; nuclear@26: info_ptr->unknown_chunks_num = 0; nuclear@26: } nuclear@26: } nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_hIST_SUPPORTED) nuclear@26: /* free any hIST entry */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_HIST) & info_ptr->free_me) nuclear@26: #else nuclear@26: if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST)) nuclear@26: #endif nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->hist); nuclear@26: info_ptr->hist = NULL; nuclear@26: info_ptr->valid &= ~PNG_INFO_hIST; nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_HIST; nuclear@26: #endif nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: /* free any PLTE entry that was internally allocated */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) nuclear@26: #else nuclear@26: if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE)) nuclear@26: #endif nuclear@26: { nuclear@26: png_zfree(png_ptr, info_ptr->palette); nuclear@26: info_ptr->palette = NULL; nuclear@26: info_ptr->valid &= ~PNG_INFO_PLTE; nuclear@26: #ifndef PNG_FREE_ME_SUPPORTED nuclear@26: png_ptr->flags &= ~PNG_FLAG_FREE_PLTE; nuclear@26: #endif nuclear@26: info_ptr->num_palette = 0; nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED) nuclear@26: /* free any image bits attached to the info structure */ nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) nuclear@26: #else nuclear@26: if (mask & PNG_FREE_ROWS) nuclear@26: #endif nuclear@26: { nuclear@26: if (info_ptr->row_pointers) nuclear@26: { nuclear@26: int row; nuclear@26: for (row = 0; row < (int)info_ptr->height; row++) nuclear@26: { nuclear@26: png_free(png_ptr, info_ptr->row_pointers[row]); nuclear@26: info_ptr->row_pointers[row]=NULL; nuclear@26: } nuclear@26: png_free(png_ptr, info_ptr->row_pointers); nuclear@26: info_ptr->row_pointers=NULL; nuclear@26: } nuclear@26: info_ptr->valid &= ~PNG_INFO_IDAT; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED nuclear@26: if (num == -1) nuclear@26: info_ptr->free_me &= ~mask; nuclear@26: else nuclear@26: info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL); nuclear@26: #endif nuclear@26: } nuclear@26: nuclear@26: /* This is an internal routine to free any memory that the info struct is nuclear@26: * pointing to before re-using it or freeing the struct itself. Recall nuclear@26: * that png_free() checks for NULL pointers for us. nuclear@26: */ nuclear@26: void /* PRIVATE */ nuclear@26: png_info_destroy(png_structp png_ptr, png_infop info_ptr) nuclear@26: { nuclear@26: png_debug(1, "in png_info_destroy\n"); nuclear@26: nuclear@26: png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); nuclear@26: nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) nuclear@26: if (png_ptr->num_chunk_list) nuclear@26: { nuclear@26: png_free(png_ptr, png_ptr->chunk_list); nuclear@26: png_ptr->chunk_list=NULL; nuclear@26: png_ptr->num_chunk_list = 0; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: png_info_init_3(&info_ptr, png_sizeof(png_info)); nuclear@26: } nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ nuclear@26: nuclear@26: /* This function returns a pointer to the io_ptr associated with the user nuclear@26: * functions. The application should free any memory associated with this nuclear@26: * pointer before png_write_destroy() or png_read_destroy() are called. nuclear@26: */ nuclear@26: png_voidp PNGAPI nuclear@26: png_get_io_ptr(png_structp png_ptr) nuclear@26: { nuclear@26: if (png_ptr == NULL) return (NULL); nuclear@26: return (png_ptr->io_ptr); nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) nuclear@26: #if !defined(PNG_NO_STDIO) nuclear@26: /* Initialize the default input/output functions for the PNG file. If you nuclear@26: * use your own read or write routines, you can call either png_set_read_fn() nuclear@26: * or png_set_write_fn() instead of png_init_io(). If you have defined nuclear@26: * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't nuclear@26: * necessarily available. nuclear@26: */ nuclear@26: void PNGAPI nuclear@26: png_init_io(png_structp png_ptr, png_FILE_p fp) nuclear@26: { nuclear@26: png_debug(1, "in png_init_io\n"); nuclear@26: if (png_ptr == NULL) return; nuclear@26: png_ptr->io_ptr = (png_voidp)fp; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: #if defined(PNG_TIME_RFC1123_SUPPORTED) nuclear@26: /* Convert the supplied time into an RFC 1123 string suitable for use in nuclear@26: * a "Creation Time" or other text-based time string. nuclear@26: */ nuclear@26: png_charp PNGAPI nuclear@26: png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime) nuclear@26: { nuclear@26: static PNG_CONST char short_months[12][4] = nuclear@26: {"Jan", "Feb", "Mar", "Apr", "May", "Jun", nuclear@26: "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; nuclear@26: nuclear@26: if (png_ptr == NULL) return (NULL); nuclear@26: if (png_ptr->time_buffer == NULL) nuclear@26: { nuclear@26: png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* nuclear@26: png_sizeof(char))); nuclear@26: } nuclear@26: nuclear@26: #if defined(_WIN32_WCE) nuclear@26: { nuclear@26: wchar_t time_buf[29]; nuclear@26: wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"), nuclear@26: ptime->day % 32, short_months[(ptime->month - 1) % 12], nuclear@26: ptime->year, ptime->hour % 24, ptime->minute % 60, nuclear@26: ptime->second % 61); nuclear@26: WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29, nuclear@26: NULL, NULL); nuclear@26: } nuclear@26: #else nuclear@26: #ifdef USE_FAR_KEYWORD nuclear@26: { nuclear@26: char near_time_buf[29]; nuclear@26: png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000", nuclear@26: ptime->day % 32, short_months[(ptime->month - 1) % 12], nuclear@26: ptime->year, ptime->hour % 24, ptime->minute % 60, nuclear@26: ptime->second % 61); nuclear@26: png_memcpy(png_ptr->time_buffer, near_time_buf, nuclear@26: 29*png_sizeof(char)); nuclear@26: } nuclear@26: #else nuclear@26: png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000", nuclear@26: ptime->day % 32, short_months[(ptime->month - 1) % 12], nuclear@26: ptime->year, ptime->hour % 24, ptime->minute % 60, nuclear@26: ptime->second % 61); nuclear@26: #endif nuclear@26: #endif /* _WIN32_WCE */ nuclear@26: return ((png_charp)png_ptr->time_buffer); nuclear@26: } nuclear@26: #endif /* PNG_TIME_RFC1123_SUPPORTED */ nuclear@26: nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ nuclear@26: nuclear@26: png_charp PNGAPI nuclear@26: png_get_copyright(png_structp png_ptr) nuclear@26: { nuclear@26: png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ nuclear@26: return ((png_charp) "\n libpng version 1.2.33 - October 31, 2008\n\ nuclear@26: Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\ nuclear@26: Copyright (c) 1996-1997 Andreas Dilger\n\ nuclear@26: Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n"); nuclear@26: } nuclear@26: nuclear@26: /* The following return the library version as a short string in the nuclear@26: * format 1.0.0 through 99.99.99zz. To get the version of *.h files nuclear@26: * used with your application, print out PNG_LIBPNG_VER_STRING, which nuclear@26: * is defined in png.h. nuclear@26: * Note: now there is no difference between png_get_libpng_ver() and nuclear@26: * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, nuclear@26: * it is guaranteed that png.c uses the correct version of png.h. nuclear@26: */ nuclear@26: png_charp PNGAPI nuclear@26: png_get_libpng_ver(png_structp png_ptr) nuclear@26: { nuclear@26: /* Version of *.c files used when building libpng */ nuclear@26: png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ nuclear@26: return ((png_charp) PNG_LIBPNG_VER_STRING); nuclear@26: } nuclear@26: nuclear@26: png_charp PNGAPI nuclear@26: png_get_header_ver(png_structp png_ptr) nuclear@26: { nuclear@26: /* Version of *.h files used when building libpng */ nuclear@26: png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ nuclear@26: return ((png_charp) PNG_LIBPNG_VER_STRING); nuclear@26: } nuclear@26: nuclear@26: png_charp PNGAPI nuclear@26: png_get_header_version(png_structp png_ptr) nuclear@26: { nuclear@26: /* Returns longer string containing both version and date */ nuclear@26: png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */ nuclear@26: return ((png_charp) PNG_HEADER_VERSION_STRING nuclear@26: #ifndef PNG_READ_SUPPORTED nuclear@26: " (NO READ SUPPORT)" nuclear@26: #endif nuclear@26: "\n"); nuclear@26: } nuclear@26: nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) nuclear@26: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED nuclear@26: int PNGAPI nuclear@26: png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name) nuclear@26: { nuclear@26: /* check chunk_name and return "keep" value if it's on the list, else 0 */ nuclear@26: int i; nuclear@26: png_bytep p; nuclear@26: if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0) nuclear@26: return 0; nuclear@26: p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5; nuclear@26: for (i = png_ptr->num_chunk_list; i; i--, p -= 5) nuclear@26: if (!png_memcmp(chunk_name, p, 4)) nuclear@26: return ((int)*(p + 4)); nuclear@26: return 0; nuclear@26: } nuclear@26: #endif nuclear@26: nuclear@26: /* This function, added to libpng-1.0.6g, is untested. */ nuclear@26: int PNGAPI nuclear@26: png_reset_zstream(png_structp png_ptr) nuclear@26: { nuclear@26: if (png_ptr == NULL) return Z_STREAM_ERROR; nuclear@26: return (inflateReset(&png_ptr->zstream)); nuclear@26: } nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ nuclear@26: nuclear@26: /* This function was added to libpng-1.0.7 */ nuclear@26: png_uint_32 PNGAPI nuclear@26: png_access_version_number(void) nuclear@26: { nuclear@26: /* Version of *.c files used when building libpng */ nuclear@26: return((png_uint_32) PNG_LIBPNG_VER); nuclear@26: } nuclear@26: nuclear@26: nuclear@26: #if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) nuclear@26: #if !defined(PNG_1_0_X) nuclear@26: /* this function was added to libpng 1.2.0 */ nuclear@26: int PNGAPI nuclear@26: png_mmx_support(void) nuclear@26: { nuclear@26: /* obsolete, to be removed from libpng-1.4.0 */ nuclear@26: return -1; nuclear@26: } nuclear@26: #endif /* PNG_1_0_X */ nuclear@26: #endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */ nuclear@26: nuclear@26: #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) nuclear@26: #ifdef PNG_SIZE_T nuclear@26: /* Added at libpng version 1.2.6 */ nuclear@26: PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); nuclear@26: png_size_t PNGAPI nuclear@26: png_convert_size(size_t size) nuclear@26: { nuclear@26: if (size > (png_size_t)-1) nuclear@26: PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */ nuclear@26: return ((png_size_t)size); nuclear@26: } nuclear@26: #endif /* PNG_SIZE_T */ nuclear@26: #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */