| |
| /* png.c - location for general purpose libpng functions |
| * |
| * libpng version 1.2.0beta3 - May 18, 2001 |
| * Copyright (c) 1998-2001 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_0beta3 Your_png_h_is_not_version_1_2_0beta3; |
| |
| /* Version information for C files. This had better match the version |
| * string defined in png.h. */ |
| |
| #ifdef PNG_USE_GLOBAL_ARRAYS |
| /* png_libpng_ver was changed to a function in version 1.0.5c */ |
| const char png_libpng_ver[18] = "1.2.0beta3"; |
| |
| /* png_sig was changed to a function in version 1.0.5c */ |
| /* Place to hold the signature string for a PNG file. */ |
| const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10}; |
| |
| /* 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; |
| |
| /* 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}; |
| |
| /* offset to next interlace block */ |
| 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}; |
| |
| /* 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 (used in assembler routines only) */ |
| #ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW |
| const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1}; |
| #endif |
| |
| /* 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}; |
| */ |
| |
| /* Mask to determine which pixels are valid in a pass */ |
| const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff}; |
| |
| /* Mask to determine which pixels to overwrite while displaying */ |
| const int FARDATA png_pass_dsp_mask[] |
| = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff}; |
| |
| #endif |
| |
| /* 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 PNGAPI |
| png_set_sig_bytes(png_structp png_ptr, int num_bytes) |
| { |
| 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 = (png_byte)(num_bytes < 0 ? 0 : num_bytes); |
| } |
| |
| /* Checks whether the supplied bytes match the PNG signature. We allow |
| * checking less than the full 8-byte signature so that those apps that |
| * already read the first few bytes of a file to determine the file type |
| * can simply check the remaining bytes for extra assurance. Returns |
| * an integer less than, equal to, or greater than zero if sig is found, |
| * 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 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); |
| |
| if (start > 7) |
| return (0); |
| |
| if (start + num_to_check > 8) |
| num_to_check = 8 - start; |
| |
| return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); |
| } |
| |
| /* (Obsolete) function to check signature bytes. It does not allow one |
| * to check a partial signature. This function might be removed in the |
| * future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG. |
| */ |
| 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 and clear it to 0. */ |
| voidpf /* PRIVATE */ |
| png_zalloc(voidpf png_ptr, uInt items, uInt size) |
| { |
| png_uint_32 num_bytes = (png_uint_32)items * size; |
| png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); |
| |
| #ifndef PNG_NO_ZALLOC_ZERO |
| 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, |
| (png_size_t)(num_bytes - (png_uint_32)0x8000L)); |
| } |
| else |
| { |
| png_memset(ptr, 0, (png_size_t)num_bytes); |
| } |
| #endif |
| return ((voidpf)ptr); |
| } |
| |
| /* function to free memory for zlib */ |
| void /* PRIVATE */ |
| png_zfree(voidpf png_ptr, voidpf ptr) |
| { |
| png_free((png_structp)png_ptr, (png_voidp)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 /* PRIVATE */ |
| png_reset_crc(png_structp png_ptr) |
| { |
| png_ptr->crc = crc32(0, Z_NULL, 0); |
| } |
| |
| /* Calculate the CRC over a section of data. We can only pass as |
| * much data to this routine as the largest single buffer size. We |
| * also check that this data will actually be used before going to the |
| * trouble of calculating it. |
| */ |
| void /* PRIVATE */ |
| png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length) |
| { |
| int need_crc = 1; |
| |
| if (png_ptr->chunk_name[0] & 0x20) /* ancillary */ |
| { |
| if ((png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_MASK) == |
| (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN)) |
| need_crc = 0; |
| } |
| else /* critical */ |
| { |
| if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) |
| need_crc = 0; |
| } |
| |
| if (need_crc) |
| png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)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)) |
| * 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 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); |
| #ifdef PNG_USER_MEM_SUPPORTED |
| if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, |
| png_ptr->malloc_fn, png_ptr->mem_ptr)) != NULL) |
| #else |
| if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL) |
| #endif |
| { |
| png_info_init_3(&info_ptr, sizeof(png_info)); |
| } |
| |
| return (info_ptr); |
| } |
| |
| /* This function frees the memory associated with a single info struct. |
| * Normally, one would use either png_destroy_read_struct() or |
| * png_destroy_write_struct() to free an info struct, but this may be |
| * useful for some applications. |
| */ |
| void PNGAPI |
| png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) |
| { |
| png_infop info_ptr = NULL; |
| |
| png_debug(1, "in png_destroy_info_struct\n"); |
| if (info_ptr_ptr != NULL) |
| info_ptr = *info_ptr_ptr; |
| |
| if (info_ptr != NULL) |
| { |
| 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); |
| #endif |
| *info_ptr_ptr = (png_infop)NULL; |
| } |
| } |
| |
| /* Initialize the info structure. This is now an internal function (0.89) |
| * and applications using it are urged to use png_create_info_struct() |
| * instead. |
| */ |
| #undef png_info_init |
| void PNGAPI |
| png_info_init(png_infop info_ptr) |
| { |
| /* We only come here via pre-1.0.12-compiled applications */ |
| png_info_init_3(&info_ptr, 0); |
| } |
| |
| void PNGAPI |
| png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) |
| { |
| png_infop info_ptr = *ptr_ptr; |
| |
| png_debug(1, "in png_info_init_3\n"); |
| |
| if(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)); |
| } |
| |
| #ifdef PNG_FREE_ME_SUPPORTED |
| void PNGAPI |
| png_data_freer(png_structp png_ptr, png_infop info_ptr, |
| int freer, png_uint_32 mask) |
| { |
| 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 |
| |
| 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) |
| { |
| 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; |
| 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 |
| { |
| 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) |
| { |
| if(info_ptr->splt_palettes) |
| { |
| 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; |
| } |
| } |
| 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 |
| |
| #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| #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; |
| } |
| #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; |
| 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, sizeof(png_info)); |
| } |
| |
| /* 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 PNGAPI |
| png_get_io_ptr(png_structp png_ptr) |
| { |
| return (png_ptr->io_ptr); |
| } |
| |
| #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(). If you have defined |
| * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't |
| * necessarily available. |
| */ |
| void PNGAPI |
| png_init_io(png_structp png_ptr, png_FILE_p fp) |
| { |
| png_debug(1, "in png_init_io\n"); |
| 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->time_buffer == NULL) |
| { |
| png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29* |
| 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]; |
| sprintf(near_time_buf, "%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*sizeof(char)); |
| } |
| #else |
| sprintf(png_ptr->time_buffer, "%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 */ |
| |
| #if 0 |
| /* Signature string for a PNG file. */ |
| png_bytep PNGAPI |
| png_sig_bytes(void) |
| { |
| return ((png_bytep)"\211\120\116\107\015\012\032\012"); |
| } |
| #endif |
| |
| png_charp PNGAPI |
| png_get_copyright(png_structp png_ptr) |
| { |
| if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */ |
| return ((png_charp) "\n libpng version 1.2.0beta3 - May 18, 2001\n\ |
| Copyright (c) 1998-2001 Glenn Randers-Pehrson\n\ |
| Copyright (c) 1996, 1997 Andreas Dilger\n\ |
| Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n"); |
| return ((png_charp) ""); |
| } |
| |
| /* 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. |
| */ |
| |
| png_charp PNGAPI |
| png_get_libpng_ver(png_structp png_ptr) |
| { |
| /* Version of *.c files used when building libpng */ |
| if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| return((png_charp) "1.2.0beta3"); |
| return((png_charp) "1.2.0beta3"); |
| } |
| |
| png_charp PNGAPI |
| png_get_header_ver(png_structp png_ptr) |
| { |
| /* Version of *.h files used when building libpng */ |
| if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| return((png_charp) PNG_LIBPNG_VER_STRING); |
| 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 */ |
| if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */ |
| return((png_charp) PNG_HEADER_VERSION_STRING); |
| return((png_charp) PNG_HEADER_VERSION_STRING); |
| } |
| |
| #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| int /* PRIVATE */ |
| 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) |
| { |
| return (inflateReset(&png_ptr->zstream)); |
| } |
| |
| /* 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) 10200L); |
| } |
| |
| |
| #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */ |
| /* this INTERNAL function was added to libpng 1.2.0 */ |
| void /* PRIVATE */ |
| png_init_mmx_flags (png_structp png_ptr) |
| { |
| png_ptr->mmx_rowbytes_threshold = 0; |
| png_ptr->mmx_bitdepth_threshold = 0; |
| |
| # if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD)) |
| |
| png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED; |
| |
| if (png_mmx_support()) { |
| png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU |
| # ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW |
| | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
| # endif |
| # ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE |
| | PNG_ASM_FLAG_MMX_READ_INTERLACE |
| # endif |
| # ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW |
| ; |
| # else |
| | PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
| | PNG_ASM_FLAG_MMX_READ_FILTER_UP |
| | PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
| | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ; |
| |
| png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT; |
| png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT; |
| # endif |
| } else { |
| png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU |
| | PNG_MMX_READ_FLAGS |
| | PNG_MMX_WRITE_FLAGS ); |
| } |
| |
| # else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */ |
| |
| /* clear all MMX flags; no support is compiled in */ |
| png_ptr->asm_flags &= ~( PNG_MMX_FLAGS ); |
| |
| # endif /* ?(PNGVCRD || PNGGCCRD) */ |
| } |
| |
| #endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */ |
| |
| /* this function was added to libpng 1.2.0 */ |
| #if !defined(PNG_USE_PNGGCCRD) && \ |
| !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD)) |
| int PNGAPI |
| png_mmx_support(void) |
| { |
| return -1; |
| } |
| #endif |