FCL/interim/QEMU: comparison symbian-qemu-0.9.1-12/libpng-1.2.32/pngmem.c

equal deleted inserted replaced

-:ffa851df0825
+:2fb8b9db1c86
+/* pngmem.c - stub functions for memory allocation
+*
+* Last changed in libpng 1.2.30 [August 15, 2008]
+* For conditions of distribution and use, see copyright notice in png.h
+* Copyright (c) 1998-2008 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.)
+*
+* This file provides a location for all memory allocation.  Users who
+* need special memory handling are expected to supply replacement
+* functions for png_malloc() and png_free(), and to use
+* png_create_read_struct_2() and png_create_write_struct_2() to
+* identify the replacement functions.
+*/
+#define PNG_INTERNAL
+#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+/* Borland DOS special memory handler */
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* if you change this, be sure to change the one in png.h also */
+/* Allocate memory for a png_struct.  The malloc and memset can be replaced
+by a single call to calloc() if this is thought to improve performance. */
+png_voidp /* PRIVATE */
+png_create_struct(int type)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+/* Alternate version of png_create_struct, for use with user-defined malloc. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+png_size_t size;
+png_voidp struct_ptr;
+if (type == PNG_STRUCT_INFO)
+size = png_sizeof(png_info);
+else if (type == PNG_STRUCT_PNG)
+size = png_sizeof(png_struct);
+else
+return (png_get_copyright(NULL));
+#ifdef PNG_USER_MEM_SUPPORTED
+if (malloc_fn != NULL)
+{
+png_struct dummy_struct;
+png_structp png_ptr = &dummy_struct;
+png_ptr->mem_ptr=mem_ptr;
+struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
+}
+else
+#endif /* PNG_USER_MEM_SUPPORTED */
+struct_ptr = (png_voidp)farmalloc(size);
+if (struct_ptr != NULL)
+png_memset(struct_ptr, 0, size);
+return (struct_ptr);
+}
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+png_voidp mem_ptr)
+{
+#endif
+if (struct_ptr != NULL)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+if (free_fn != NULL)
+{
+png_struct dummy_struct;
+png_structp png_ptr = &dummy_struct;
+png_ptr->mem_ptr=mem_ptr;
+(*(free_fn))(png_ptr, struct_ptr);
+return;
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+farfree (struct_ptr);
+}
+}
+/* Allocate memory.  For reasonable files, size should never exceed
+* 64K.  However, zlib may allocate more then 64K if you don't tell
+* it not to.  See zconf.h and png.h for more information. zlib does
+* need to allocate exactly 64K, so whatever you call here must
+* have the ability to do that.
+*
+* Borland seems to have a problem in DOS mode for exactly 64K.
+* It gives you a segment with an offset of 8 (perhaps to store its
+* memory stuff).  zlib doesn't like this at all, so we have to
+* detect and deal with it.  This code should not be needed in
+* Windows or OS/2 modes, and only in 16 bit mode.  This code has
+* been updated by Alexander Lehmann for version 0.89 to waste less
+* memory.
+*
+* Note that we can't use png_size_t for the "size" declaration,
+* since on some systems a png_size_t is a 16-bit quantity, and as a
+* result, we would be truncating potentially larger memory requests
+* (which should cause a fatal error) and introducing major problems.
+*/
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_uint_32 size)
+{
+png_voidp ret;
+if (png_ptr == NULL || size == 0)
+return (NULL);
+#ifdef PNG_USER_MEM_SUPPORTED
+if (png_ptr->malloc_fn != NULL)
+ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+else
+ret = (png_malloc_default(png_ptr, size));
+if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out of memory!");
+return (ret);
+}
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
+if (png_ptr == NULL || size == 0)
+return (NULL);
+#ifdef PNG_MAX_MALLOC_64K
+if (size > (png_uint_32)65536L)
+{
+png_warning(png_ptr, "Cannot Allocate > 64K");
+ret = NULL;
+}
+else
+#endif
+if (size != (size_t)size)
+ret = NULL;
+else if (size == (png_uint_32)65536L)
+{
+if (png_ptr->offset_table == NULL)
+{
+/* try to see if we need to do any of this fancy stuff */
+ret = farmalloc(size);
+if (ret == NULL || ((png_size_t)ret & 0xffff))
+{
+int num_blocks;
+png_uint_32 total_size;
+png_bytep table;
+int i;
+png_byte huge * hptr;
+if (ret != NULL)
+{
+farfree(ret);
+ret = NULL;
+}
+if (png_ptr->zlib_window_bits > 14)
+num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
+else
+num_blocks = 1;
+if (png_ptr->zlib_mem_level >= 7)
+num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
+else
+num_blocks++;
+total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
+table = farmalloc(total_size);
+if (table == NULL)
+{
+#ifndef PNG_USER_MEM_SUPPORTED
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+else
+png_warning(png_ptr, "Out Of Memory.");
+#endif
+return (NULL);
+}
+if ((png_size_t)table & 0xfff0)
+{
+#ifndef PNG_USER_MEM_SUPPORTED
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr,
+"Farmalloc didn't return normalized pointer");
+else
+png_warning(png_ptr,
+"Farmalloc didn't return normalized pointer");
+#endif
+return (NULL);
+}
+png_ptr->offset_table = table;
+png_ptr->offset_table_ptr = farmalloc(num_blocks *
+png_sizeof(png_bytep));
+if (png_ptr->offset_table_ptr == NULL)
+{
+#ifndef PNG_USER_MEM_SUPPORTED
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
+else
+png_warning(png_ptr, "Out Of memory.");
+#endif
+return (NULL);
+}
+hptr = (png_byte huge *)table;
+if ((png_size_t)hptr & 0xf)
+{
+hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
+hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
+}
+for (i = 0; i < num_blocks; i++)
+{
+png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
+hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
+}
+png_ptr->offset_table_number = num_blocks;
+png_ptr->offset_table_count = 0;
+png_ptr->offset_table_count_free = 0;
+}
+}
+if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
+{
+#ifndef PNG_USER_MEM_SUPPORTED
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+else
+png_warning(png_ptr, "Out of Memory.");
+#endif
+return (NULL);
+}
+ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
+}
+else
+ret = farmalloc(size);
+#ifndef PNG_USER_MEM_SUPPORTED
+if (ret == NULL)
+{
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+else
+png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
+}
+#endif
+return (ret);
+}
+/* free a pointer allocated by png_malloc().  In the default
+configuration, png_ptr is not used, but is passed in case it
+is needed.  If ptr is NULL, return without taking any action. */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+if (png_ptr == NULL || ptr == NULL)
+return;
+#ifdef PNG_USER_MEM_SUPPORTED
+if (png_ptr->free_fn != NULL)
+{
+(*(png_ptr->free_fn))(png_ptr, ptr);
+return;
+}
+else png_free_default(png_ptr, ptr);
+}
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+if (png_ptr == NULL || ptr == NULL) return;
+if (png_ptr->offset_table != NULL)
+{
+int i;
+for (i = 0; i < png_ptr->offset_table_count; i++)
+{
+if (ptr == png_ptr->offset_table_ptr[i])
+{
+ptr = NULL;
+png_ptr->offset_table_count_free++;
+break;
+}
+}
+if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
+{
+farfree(png_ptr->offset_table);
+farfree(png_ptr->offset_table_ptr);
+png_ptr->offset_table = NULL;
+png_ptr->offset_table_ptr = NULL;
+}
+}
+if (ptr != NULL)
+{
+farfree(ptr);
+}
+}
+#else /* Not the Borland DOS special memory handler */
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+memset can be replaced by a single call to calloc() if this is thought
+to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct(int type)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
+}
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+memset can be replaced by a single call to calloc() if this is thought
+to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+png_size_t size;
+png_voidp struct_ptr;
+if (type == PNG_STRUCT_INFO)
+size = png_sizeof(png_info);
+else if (type == PNG_STRUCT_PNG)
+size = png_sizeof(png_struct);
+else
+return (NULL);
+#ifdef PNG_USER_MEM_SUPPORTED
+if (malloc_fn != NULL)
+{
+png_struct dummy_struct;
+png_structp png_ptr = &dummy_struct;
+png_ptr->mem_ptr=mem_ptr;
+struct_ptr = (*(malloc_fn))(png_ptr, size);
+if (struct_ptr != NULL)
+png_memset(struct_ptr, 0, size);
+return (struct_ptr);
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+struct_ptr = (png_voidp)farmalloc(size);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+struct_ptr = (png_voidp)halloc(size, 1);
+# else
+struct_ptr = (png_voidp)malloc(size);
+# endif
+#endif
+if (struct_ptr != NULL)
+png_memset(struct_ptr, 0, size);
+return (struct_ptr);
+}
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
+}
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+png_voidp mem_ptr)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+if (struct_ptr != NULL)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+if (free_fn != NULL)
+{
+png_struct dummy_struct;
+png_structp png_ptr = &dummy_struct;
+png_ptr->mem_ptr=mem_ptr;
+(*(free_fn))(png_ptr, struct_ptr);
+return;
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+farfree(struct_ptr);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+hfree(struct_ptr);
+# else
+free(struct_ptr);
+# endif
+#endif
+}
+}
+/* Allocate memory.  For reasonable files, size should never exceed
+64K.  However, zlib may allocate more then 64K if you don't tell
+it not to.  See zconf.h and png.h for more information.  zlib does
+need to allocate exactly 64K, so whatever you call here must
+have the ability to do that. */
+png_voidp PNGAPI
+png_malloc(png_structp png_ptr, png_uint_32 size)
+{
+png_voidp ret;
+#ifdef PNG_USER_MEM_SUPPORTED
+if (png_ptr == NULL || size == 0)
+return (NULL);
+if (png_ptr->malloc_fn != NULL)
+ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+else
+ret = (png_malloc_default(png_ptr, size));
+if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out of Memory!");
+return (ret);
+}
+png_voidp PNGAPI
+png_malloc_default(png_structp png_ptr, png_uint_32 size)
+{
+png_voidp ret;
+#endif /* PNG_USER_MEM_SUPPORTED */
+if (png_ptr == NULL || size == 0)
+return (NULL);
+#ifdef PNG_MAX_MALLOC_64K
+if (size > (png_uint_32)65536L)
+{
+#ifndef PNG_USER_MEM_SUPPORTED
+if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Cannot Allocate > 64K");
+else
+#endif
+return NULL;
+}
+#endif
+/* Check for overflow */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+if (size != (unsigned long)size)
+ret = NULL;
+else
+ret = farmalloc(size);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+if (size != (unsigned long)size)
+ret = NULL;
+else
+ret = halloc(size, 1);
+# else
+if (size != (size_t)size)
+ret = NULL;
+else
+ret = malloc((size_t)size);
+# endif
+#endif
+#ifndef PNG_USER_MEM_SUPPORTED
+if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+png_error(png_ptr, "Out of Memory");
+#endif
+return (ret);
+}
+/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
+without taking any action. */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+if (png_ptr == NULL || ptr == NULL)
+return;
+#ifdef PNG_USER_MEM_SUPPORTED
+if (png_ptr->free_fn != NULL)
+{
+(*(png_ptr->free_fn))(png_ptr, ptr);
+return;
+}
+else png_free_default(png_ptr, ptr);
+}
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+if (png_ptr == NULL || ptr == NULL)
+return;
+#endif /* PNG_USER_MEM_SUPPORTED */
+#if defined(__TURBOC__) && !defined(__FLAT__)
+farfree(ptr);
+#else
+# if defined(_MSC_VER) && defined(MAXSEG_64K)
+hfree(ptr);
+# else
+free(ptr);
+# endif
+#endif
+}
+#endif /* Not Borland DOS special memory handler */
+#if defined(PNG_1_0_X)
+#  define png_malloc_warn png_malloc
+#else
+/* This function was added at libpng version 1.2.3.  The png_malloc_warn()
+* function will set up png_malloc() to issue a png_warning and return NULL
+* instead of issuing a png_error, if it fails to allocate the requested
+* memory.
+*/
+png_voidp PNGAPI
+png_malloc_warn(png_structp png_ptr, png_uint_32 size)
+{
+png_voidp ptr;
+png_uint_32 save_flags;
+if (png_ptr == NULL) return (NULL);
+save_flags = png_ptr->flags;
+png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
+png_ptr->flags=save_flags;
+return(ptr);
+}
+#endif
+png_voidp PNGAPI
+png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
+png_uint_32 length)
+{
+png_size_t size;
+size = (png_size_t)length;
+if ((png_uint_32)size != length)
+png_error(png_ptr, "Overflow in png_memcpy_check.");
+return(png_memcpy (s1, s2, size));
+}
+png_voidp PNGAPI
+png_memset_check (png_structp png_ptr, png_voidp s1, int value,
+png_uint_32 length)
+{
+png_size_t size;
+size = (png_size_t)length;
+if ((png_uint_32)size != length)
+png_error(png_ptr, "Overflow in png_memset_check.");
+return (png_memset (s1, value, size));
+}
+#ifdef PNG_USER_MEM_SUPPORTED
+/* This function is called when the application wants to use another method
+* of allocating and freeing memory.
+*/
+void PNGAPI
+png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
+malloc_fn, png_free_ptr free_fn)
+{
+if (png_ptr != NULL)
+{
+png_ptr->mem_ptr = mem_ptr;
+png_ptr->malloc_fn = malloc_fn;
+png_ptr->free_fn = free_fn;
+}
+}
+/* This function returns a pointer to the mem_ptr associated with the user
+* functions.  The application should free any memory associated with this
+* pointer before png_write_destroy and png_read_destroy are called.
+*/
+png_voidp PNGAPI
+png_get_mem_ptr(png_structp png_ptr)
+{
+if (png_ptr == NULL) return (NULL);
+return ((png_voidp)png_ptr->mem_ptr);
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */