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-rw-r--r--png/pngmem.c281
1 files changed, 0 insertions, 281 deletions
diff --git a/png/pngmem.c b/png/pngmem.c
deleted file mode 100644
index 8ee0866..0000000
--- a/png/pngmem.c
+++ /dev/null
@@ -1,281 +0,0 @@
-
-/* pngmem.c - stub functions for memory allocation
- *
- * Last changed in libpng 1.6.8 [December 19, 2013]
- * Copyright (c) 1998-2013 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 code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * 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.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Free a png_struct */
-void /* PRIVATE */
-png_destroy_png_struct(png_structrp png_ptr)
-{
- if (png_ptr != NULL)
- {
- /* png_free might call png_error and may certainly call
- * png_get_mem_ptr, so fake a temporary png_struct to support this.
- */
- png_struct dummy_struct = *png_ptr;
- memset(png_ptr, 0, (sizeof *png_ptr));
- png_free(&dummy_struct, png_ptr);
-
-# ifdef PNG_SETJMP_SUPPORTED
- /* We may have a jmp_buf left to deallocate. */
- png_free_jmpbuf(&dummy_struct);
-# 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_FUNCTION(png_voidp,PNGAPI
-png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
- png_voidp ret;
-
- ret = png_malloc(png_ptr, size);
-
- if (ret != NULL)
- memset(ret, 0, size);
-
- return ret;
-}
-
-/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of
- * allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED.
- * Checking and error handling must happen outside this routine; it returns NULL
- * if the allocation cannot be done (for any reason.)
- */
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED)
-{
- /* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS
- * allocators have also been removed in 1.6.0, so any 16-bit system now has
- * to implement a user memory handler. This checks to be sure it isn't
- * called with big numbers.
- */
-#ifndef PNG_USER_MEM_SUPPORTED
- PNG_UNUSED(png_ptr)
-#endif
-
- if (size > 0 && size <= PNG_SIZE_MAX
-# ifdef PNG_MAX_MALLOC_64K
- && size <= 65536U
-# endif
- )
- {
-#ifdef PNG_USER_MEM_SUPPORTED
- if (png_ptr != NULL && png_ptr->malloc_fn != NULL)
- return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size);
-
- else
-#endif
- return malloc((size_t)size); /* checked for truncation above */
- }
-
- else
- return NULL;
-}
-
-#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
- defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
-/* This is really here only to work round a spurious warning in GCC 4.6 and 4.7
- * that arises because of the checks in png_realloc_array that are repeated in
- * png_malloc_array.
- */
-static png_voidp
-png_malloc_array_checked(png_const_structrp png_ptr, int nelements,
- size_t element_size)
-{
- png_alloc_size_t req = nelements; /* known to be > 0 */
-
- if (req <= PNG_SIZE_MAX/element_size)
- return png_malloc_base(png_ptr, req * element_size);
-
- /* The failure case when the request is too large */
- return NULL;
-}
-
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_malloc_array,(png_const_structrp png_ptr, int nelements,
- size_t element_size),PNG_ALLOCATED)
-{
- if (nelements <= 0 || element_size == 0)
- png_error(png_ptr, "internal error: array alloc");
-
- return png_malloc_array_checked(png_ptr, nelements, element_size);
-}
-
-PNG_FUNCTION(png_voidp /* PRIVATE */,
-png_realloc_array,(png_const_structrp png_ptr, png_const_voidp old_array,
- int old_elements, int add_elements, size_t element_size),PNG_ALLOCATED)
-{
- /* These are internal errors: */
- if (add_elements <= 0 || element_size == 0 || old_elements < 0 ||
- (old_array == NULL && old_elements > 0))
- png_error(png_ptr, "internal error: array realloc");
-
- /* Check for overflow on the elements count (so the caller does not have to
- * check.)
- */
- if (add_elements <= INT_MAX - old_elements)
- {
- png_voidp new_array = png_malloc_array_checked(png_ptr,
- old_elements+add_elements, element_size);
-
- if (new_array != NULL)
- {
- /* Because png_malloc_array worked the size calculations below cannot
- * overflow.
- */
- if (old_elements > 0)
- memcpy(new_array, old_array, element_size*(unsigned)old_elements);
-
- memset((char*)new_array + element_size*(unsigned)old_elements, 0,
- element_size*(unsigned)add_elements);
-
- return new_array;
- }
- }
-
- return NULL; /* error */
-}
-#endif /* TEXT || sPLT || STORE_UNKNOWN_CHUNKS */
-
-/* Various functions that have different error handling are derived from this.
- * png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate
- * function png_malloc_default is also provided.
- */
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
-{
- png_voidp ret;
-
- if (png_ptr == NULL)
- return NULL;
-
- ret = png_malloc_base(png_ptr, size);
-
- if (ret == NULL)
- png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */
-
- return ret;
-}
-
-#ifdef PNG_USER_MEM_SUPPORTED
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED PNG_DEPRECATED)
-{
- png_voidp ret;
-
- if (png_ptr == NULL)
- return NULL;
-
- /* Passing 'NULL' here bypasses the application provided memory handler. */
- ret = png_malloc_base(NULL/*use malloc*/, size);
-
- if (ret == NULL)
- png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */
-
- return ret;
-}
-#endif /* PNG_USER_MEM_SUPPORTED */
-
-/* This function was added at libpng version 1.2.3. The png_malloc_warn()
- * function will issue a png_warning and return NULL instead of issuing a
- * png_error, if it fails to allocate the requested memory.
- */
-PNG_FUNCTION(png_voidp,PNGAPI
-png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size),
- PNG_ALLOCATED)
-{
- if (png_ptr != NULL)
- {
- png_voidp ret = png_malloc_base(png_ptr, size);
-
- if (ret != NULL)
- return ret;
-
- png_warning(png_ptr, "Out of memory");
- }
-
- return NULL;
-}
-
-/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
- * without taking any action.
- */
-void PNGAPI
-png_free(png_const_structrp 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_constcast(png_structrp,png_ptr), ptr);
-
- else
- png_free_default(png_ptr, ptr);
-}
-
-PNG_FUNCTION(void,PNGAPI
-png_free_default,(png_const_structrp png_ptr, png_voidp ptr),PNG_DEPRECATED)
-{
- if (png_ptr == NULL || ptr == NULL)
- return;
-#endif /* PNG_USER_MEM_SUPPORTED */
-
- free(ptr);
-}
-
-#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_structrp 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_const_structrp png_ptr)
-{
- if (png_ptr == NULL)
- return NULL;
-
- return png_ptr->mem_ptr;
-}
-#endif /* PNG_USER_MEM_SUPPORTED */
-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-18 10:26:35 +0000