--- /dev/null
+\r
+/* pngmem.c - stub functions for memory allocation\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
+ * This file provides a location for all memory allocation. Users who\r
+ * need special memory handling are expected to supply replacement\r
+ * functions for png_malloc() and png_free(), and to use\r
+ * png_create_read_struct_2() and png_create_write_struct_2() to\r
+ * identify the replacement functions.\r
+ */\r
+\r
+#define PNG_INTERNAL\r
+#include "png.h"\r
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)\r
+\r
+/* Borland DOS special memory handler */\r
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)\r
+/* if you change this, be sure to change the one in png.h also */\r
+\r
+/* Allocate memory for a png_struct. The malloc and memset can be replaced\r
+ by a single call to calloc() if this is thought to improve performance. */\r
+png_voidp /* PRIVATE */\r
+png_create_struct(int type)\r
+{\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));\r
+}\r
+\r
+/* Alternate version of png_create_struct, for use with user-defined malloc. */\r
+png_voidp /* PRIVATE */\r
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)\r
+{\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ png_size_t size;\r
+ png_voidp struct_ptr;\r
+\r
+ if (type == PNG_STRUCT_INFO)\r
+ size = png_sizeof(png_info);\r
+ else if (type == PNG_STRUCT_PNG)\r
+ size = png_sizeof(png_struct);\r
+ else\r
+ return (png_get_copyright(NULL));\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (malloc_fn != NULL)\r
+ {\r
+ png_struct dummy_struct;\r
+ png_structp png_ptr = &dummy_struct;\r
+ png_ptr->mem_ptr=mem_ptr;\r
+ struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);\r
+ }\r
+ else\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ struct_ptr = (png_voidp)farmalloc(size);\r
+ if (struct_ptr != NULL)\r
+ png_memset(struct_ptr, 0, size);\r
+ return (struct_ptr);\r
+}\r
+\r
+/* Free memory allocated by a png_create_struct() call */\r
+void /* PRIVATE */\r
+png_destroy_struct(png_voidp struct_ptr)\r
+{\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);\r
+}\r
+\r
+/* Free memory allocated by a png_create_struct() call */\r
+void /* PRIVATE */\r
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,\r
+ png_voidp mem_ptr)\r
+{\r
+#endif\r
+ if (struct_ptr != NULL)\r
+ {\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (free_fn != NULL)\r
+ {\r
+ png_struct dummy_struct;\r
+ png_structp png_ptr = &dummy_struct;\r
+ png_ptr->mem_ptr=mem_ptr;\r
+ (*(free_fn))(png_ptr, struct_ptr);\r
+ return;\r
+ }\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ farfree (struct_ptr);\r
+ }\r
+}\r
+\r
+/* Allocate memory. For reasonable files, size should never exceed\r
+ * 64K. However, zlib may allocate more then 64K if you don't tell\r
+ * it not to. See zconf.h and png.h for more information. zlib does\r
+ * need to allocate exactly 64K, so whatever you call here must\r
+ * have the ability to do that.\r
+ *\r
+ * Borland seems to have a problem in DOS mode for exactly 64K.\r
+ * It gives you a segment with an offset of 8 (perhaps to store its\r
+ * memory stuff). zlib doesn't like this at all, so we have to\r
+ * detect and deal with it. This code should not be needed in\r
+ * Windows or OS/2 modes, and only in 16 bit mode. This code has\r
+ * been updated by Alexander Lehmann for version 0.89 to waste less\r
+ * memory.\r
+ *\r
+ * Note that we can't use png_size_t for the "size" declaration,\r
+ * since on some systems a png_size_t is a 16-bit quantity, and as a\r
+ * result, we would be truncating potentially larger memory requests\r
+ * (which should cause a fatal error) and introducing major problems.\r
+ */\r
+\r
+png_voidp PNGAPI\r
+png_malloc(png_structp png_ptr, png_uint_32 size)\r
+{\r
+ png_voidp ret;\r
+\r
+ if (png_ptr == NULL || size == 0)\r
+ return (NULL);\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (png_ptr->malloc_fn != NULL)\r
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));\r
+ else\r
+ ret = (png_malloc_default(png_ptr, size));\r
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out of memory!");\r
+ return (ret);\r
+}\r
+\r
+png_voidp PNGAPI\r
+png_malloc_default(png_structp png_ptr, png_uint_32 size)\r
+{\r
+ png_voidp ret;\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+\r
+ if (png_ptr == NULL || size == 0)\r
+ return (NULL);\r
+\r
+#ifdef PNG_MAX_MALLOC_64K\r
+ if (size > (png_uint_32)65536L)\r
+ {\r
+ png_warning(png_ptr, "Cannot Allocate > 64K");\r
+ ret = NULL;\r
+ }\r
+ else\r
+#endif\r
+\r
+ if (size != (size_t)size)\r
+ ret = NULL;\r
+ else if (size == (png_uint_32)65536L)\r
+ {\r
+ if (png_ptr->offset_table == NULL)\r
+ {\r
+ /* try to see if we need to do any of this fancy stuff */\r
+ ret = farmalloc(size);\r
+ if (ret == NULL || ((png_size_t)ret & 0xffff))\r
+ {\r
+ int num_blocks;\r
+ png_uint_32 total_size;\r
+ png_bytep table;\r
+ int i;\r
+ png_byte huge * hptr;\r
+\r
+ if (ret != NULL)\r
+ {\r
+ farfree(ret);\r
+ ret = NULL;\r
+ }\r
+\r
+ if (png_ptr->zlib_window_bits > 14)\r
+ num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));\r
+ else\r
+ num_blocks = 1;\r
+ if (png_ptr->zlib_mem_level >= 7)\r
+ num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));\r
+ else\r
+ num_blocks++;\r
+\r
+ total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;\r
+\r
+ table = farmalloc(total_size);\r
+\r
+ if (table == NULL)\r
+ {\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */\r
+ else\r
+ png_warning(png_ptr, "Out Of Memory.");\r
+#endif\r
+ return (NULL);\r
+ }\r
+\r
+ if ((png_size_t)table & 0xfff0)\r
+ {\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr,\r
+ "Farmalloc didn't return normalized pointer");\r
+ else\r
+ png_warning(png_ptr,\r
+ "Farmalloc didn't return normalized pointer");\r
+#endif\r
+ return (NULL);\r
+ }\r
+\r
+ png_ptr->offset_table = table;\r
+ png_ptr->offset_table_ptr = farmalloc(num_blocks *\r
+ png_sizeof(png_bytep));\r
+\r
+ if (png_ptr->offset_table_ptr == NULL)\r
+ {\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */\r
+ else\r
+ png_warning(png_ptr, "Out Of memory.");\r
+#endif\r
+ return (NULL);\r
+ }\r
+\r
+ hptr = (png_byte huge *)table;\r
+ if ((png_size_t)hptr & 0xf)\r
+ {\r
+ hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);\r
+ hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */\r
+ }\r
+ for (i = 0; i < num_blocks; i++)\r
+ {\r
+ png_ptr->offset_table_ptr[i] = (png_bytep)hptr;\r
+ hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */\r
+ }\r
+\r
+ png_ptr->offset_table_number = num_blocks;\r
+ png_ptr->offset_table_count = 0;\r
+ png_ptr->offset_table_count_free = 0;\r
+ }\r
+ }\r
+\r
+ if (png_ptr->offset_table_count >= png_ptr->offset_table_number)\r
+ {\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */\r
+ else\r
+ png_warning(png_ptr, "Out of Memory.");\r
+#endif\r
+ return (NULL);\r
+ }\r
+\r
+ ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];\r
+ }\r
+ else\r
+ ret = farmalloc(size);\r
+\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if (ret == NULL)\r
+ {\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */\r
+ else\r
+ png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */\r
+ }\r
+#endif\r
+\r
+ return (ret);\r
+}\r
+\r
+/* free a pointer allocated by png_malloc(). In the default\r
+ configuration, png_ptr is not used, but is passed in case it\r
+ is needed. If ptr is NULL, return without taking any action. */\r
+\r
+void PNGAPI\r
+png_free(png_structp png_ptr, png_voidp ptr)\r
+{\r
+ if (png_ptr == NULL || ptr == NULL)\r
+ return;\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (png_ptr->free_fn != NULL)\r
+ {\r
+ (*(png_ptr->free_fn))(png_ptr, ptr);\r
+ return;\r
+ }\r
+ else png_free_default(png_ptr, ptr);\r
+}\r
+\r
+void PNGAPI\r
+png_free_default(png_structp png_ptr, png_voidp ptr)\r
+{\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+\r
+ if (png_ptr == NULL || ptr == NULL) return;\r
+\r
+ if (png_ptr->offset_table != NULL)\r
+ {\r
+ int i;\r
+\r
+ for (i = 0; i < png_ptr->offset_table_count; i++)\r
+ {\r
+ if (ptr == png_ptr->offset_table_ptr[i])\r
+ {\r
+ ptr = NULL;\r
+ png_ptr->offset_table_count_free++;\r
+ break;\r
+ }\r
+ }\r
+ if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)\r
+ {\r
+ farfree(png_ptr->offset_table);\r
+ farfree(png_ptr->offset_table_ptr);\r
+ png_ptr->offset_table = NULL;\r
+ png_ptr->offset_table_ptr = NULL;\r
+ }\r
+ }\r
+\r
+ if (ptr != NULL)\r
+ {\r
+ farfree(ptr);\r
+ }\r
+}\r
+\r
+#else /* Not the Borland DOS special memory handler */\r
+\r
+/* Allocate memory for a png_struct or a png_info. The malloc and\r
+ memset can be replaced by a single call to calloc() if this is thought\r
+ to improve performance noticably. */\r
+png_voidp /* PRIVATE */\r
+png_create_struct(int type)\r
+{\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));\r
+}\r
+\r
+/* Allocate memory for a png_struct or a png_info. The malloc and\r
+ memset can be replaced by a single call to calloc() if this is thought\r
+ to improve performance noticably. */\r
+png_voidp /* PRIVATE */\r
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)\r
+{\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ png_size_t size;\r
+ png_voidp struct_ptr;\r
+\r
+ if (type == PNG_STRUCT_INFO)\r
+ size = png_sizeof(png_info);\r
+ else if (type == PNG_STRUCT_PNG)\r
+ size = png_sizeof(png_struct);\r
+ else\r
+ return (NULL);\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (malloc_fn != NULL)\r
+ {\r
+ png_struct dummy_struct;\r
+ png_structp png_ptr = &dummy_struct;\r
+ png_ptr->mem_ptr=mem_ptr;\r
+ struct_ptr = (*(malloc_fn))(png_ptr, size);\r
+ if (struct_ptr != NULL)\r
+ png_memset(struct_ptr, 0, size);\r
+ return (struct_ptr);\r
+ }\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+\r
+#if defined(__TURBOC__) && !defined(__FLAT__)\r
+ struct_ptr = (png_voidp)farmalloc(size);\r
+#else\r
+# if defined(_MSC_VER) && defined(MAXSEG_64K)\r
+ struct_ptr = (png_voidp)halloc(size, 1);\r
+# else\r
+ struct_ptr = (png_voidp)malloc(size);\r
+# endif\r
+#endif\r
+ if (struct_ptr != NULL)\r
+ png_memset(struct_ptr, 0, size);\r
+\r
+ return (struct_ptr);\r
+}\r
+\r
+\r
+/* Free memory allocated by a png_create_struct() call */\r
+void /* PRIVATE */\r
+png_destroy_struct(png_voidp struct_ptr)\r
+{\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);\r
+}\r
+\r
+/* Free memory allocated by a png_create_struct() call */\r
+void /* PRIVATE */\r
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,\r
+ png_voidp mem_ptr)\r
+{\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+ if (struct_ptr != NULL)\r
+ {\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (free_fn != NULL)\r
+ {\r
+ png_struct dummy_struct;\r
+ png_structp png_ptr = &dummy_struct;\r
+ png_ptr->mem_ptr=mem_ptr;\r
+ (*(free_fn))(png_ptr, struct_ptr);\r
+ return;\r
+ }\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+#if defined(__TURBOC__) && !defined(__FLAT__)\r
+ farfree(struct_ptr);\r
+#else\r
+# if defined(_MSC_VER) && defined(MAXSEG_64K)\r
+ hfree(struct_ptr);\r
+# else\r
+ free(struct_ptr);\r
+# endif\r
+#endif\r
+ }\r
+}\r
+\r
+/* Allocate memory. For reasonable files, size should never exceed\r
+ 64K. However, zlib may allocate more then 64K if you don't tell\r
+ it not to. See zconf.h and png.h for more information. zlib does\r
+ need to allocate exactly 64K, so whatever you call here must\r
+ have the ability to do that. */\r
+\r
+png_voidp PNGAPI\r
+png_malloc(png_structp png_ptr, png_uint_32 size)\r
+{\r
+ png_voidp ret;\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (png_ptr == NULL || size == 0)\r
+ return (NULL);\r
+\r
+ if (png_ptr->malloc_fn != NULL)\r
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));\r
+ else\r
+ ret = (png_malloc_default(png_ptr, size));\r
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out of Memory!");\r
+ return (ret);\r
+}\r
+\r
+png_voidp PNGAPI\r
+png_malloc_default(png_structp png_ptr, png_uint_32 size)\r
+{\r
+ png_voidp ret;\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+\r
+ if (png_ptr == NULL || size == 0)\r
+ return (NULL);\r
+\r
+#ifdef PNG_MAX_MALLOC_64K\r
+ if (size > (png_uint_32)65536L)\r
+ {\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Cannot Allocate > 64K");\r
+ else\r
+#endif\r
+ return NULL;\r
+ }\r
+#endif\r
+\r
+ /* Check for overflow */\r
+#if defined(__TURBOC__) && !defined(__FLAT__)\r
+ if (size != (unsigned long)size)\r
+ ret = NULL;\r
+ else\r
+ ret = farmalloc(size);\r
+#else\r
+# if defined(_MSC_VER) && defined(MAXSEG_64K)\r
+ if (size != (unsigned long)size)\r
+ ret = NULL;\r
+ else\r
+ ret = halloc(size, 1);\r
+# else\r
+ if (size != (size_t)size)\r
+ ret = NULL;\r
+ else\r
+ ret = malloc((size_t)size);\r
+# endif\r
+#endif\r
+\r
+#ifndef PNG_USER_MEM_SUPPORTED\r
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)\r
+ png_error(png_ptr, "Out of Memory");\r
+#endif\r
+\r
+ return (ret);\r
+}\r
+\r
+/* Free a pointer allocated by png_malloc(). If ptr is NULL, return\r
+ without taking any action. */\r
+void PNGAPI\r
+png_free(png_structp png_ptr, png_voidp ptr)\r
+{\r
+ if (png_ptr == NULL || ptr == NULL)\r
+ return;\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+ if (png_ptr->free_fn != NULL)\r
+ {\r
+ (*(png_ptr->free_fn))(png_ptr, ptr);\r
+ return;\r
+ }\r
+ else png_free_default(png_ptr, ptr);\r
+}\r
+void PNGAPI\r
+png_free_default(png_structp png_ptr, png_voidp ptr)\r
+{\r
+ if (png_ptr == NULL || ptr == NULL)\r
+ return;\r
+\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+\r
+#if defined(__TURBOC__) && !defined(__FLAT__)\r
+ farfree(ptr);\r
+#else\r
+# if defined(_MSC_VER) && defined(MAXSEG_64K)\r
+ hfree(ptr);\r
+# else\r
+ free(ptr);\r
+# endif\r
+#endif\r
+}\r
+\r
+#endif /* Not Borland DOS special memory handler */\r
+\r
+#if defined(PNG_1_0_X)\r
+# define png_malloc_warn png_malloc\r
+#else\r
+/* This function was added at libpng version 1.2.3. The png_malloc_warn()\r
+ * function will set up png_malloc() to issue a png_warning and return NULL\r
+ * instead of issuing a png_error, if it fails to allocate the requested\r
+ * memory.\r
+ */\r
+png_voidp PNGAPI\r
+png_malloc_warn(png_structp png_ptr, png_uint_32 size)\r
+{\r
+ png_voidp ptr;\r
+ png_uint_32 save_flags;\r
+ if (png_ptr == NULL) return (NULL);\r
+\r
+ save_flags = png_ptr->flags;\r
+ png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;\r
+ ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);\r
+ png_ptr->flags=save_flags;\r
+ return(ptr);\r
+}\r
+#endif\r
+\r
+png_voidp PNGAPI\r
+png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,\r
+ png_uint_32 length)\r
+{\r
+ png_size_t size;\r
+\r
+ size = (png_size_t)length;\r
+ if ((png_uint_32)size != length)\r
+ png_error(png_ptr, "Overflow in png_memcpy_check.");\r
+\r
+ return(png_memcpy (s1, s2, size));\r
+}\r
+\r
+png_voidp PNGAPI\r
+png_memset_check (png_structp png_ptr, png_voidp s1, int value,\r
+ png_uint_32 length)\r
+{\r
+ png_size_t size;\r
+\r
+ size = (png_size_t)length;\r
+ if ((png_uint_32)size != length)\r
+ png_error(png_ptr, "Overflow in png_memset_check.");\r
+\r
+ return (png_memset (s1, value, size));\r
+\r
+}\r
+\r
+#ifdef PNG_USER_MEM_SUPPORTED\r
+/* This function is called when the application wants to use another method\r
+ * of allocating and freeing memory.\r
+ */\r
+void PNGAPI\r
+png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr\r
+ malloc_fn, png_free_ptr free_fn)\r
+{\r
+ if (png_ptr != NULL)\r
+ {\r
+ png_ptr->mem_ptr = mem_ptr;\r
+ png_ptr->malloc_fn = malloc_fn;\r
+ png_ptr->free_fn = free_fn;\r
+ }\r
+}\r
+\r
+/* This function returns a pointer to the mem_ptr associated with the user\r
+ * functions. The application should free any memory associated with this\r
+ * pointer before png_write_destroy and png_read_destroy are called.\r
+ */\r
+png_voidp PNGAPI\r
+png_get_mem_ptr(png_structp png_ptr)\r
+{\r
+ if (png_ptr == NULL) return (NULL);\r
+ return ((png_voidp)png_ptr->mem_ptr);\r
+}\r
+#endif /* PNG_USER_MEM_SUPPORTED */\r
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */\r
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