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