141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* Data Alignment
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*
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* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/crt.h>
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/* Data Alignment: http://msdn.microsoft.com/en-us/library/fs9stz4e/ */
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#ifndef _WIN32
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#include <stdlib.h>
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#ifdef __APPLE__
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#include <malloc/malloc.h>
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#else
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#include <malloc.h>
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#endif
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struct _aligned_meminfo
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{
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size_t size;
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void* base_addr;
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};
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void* _aligned_malloc(size_t size, size_t alignment)
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{
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return _aligned_offset_malloc(size, alignment, 0);
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}
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void* _aligned_realloc(void* memblock, size_t size, size_t alignment)
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{
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return _aligned_offset_realloc(memblock, size, alignment, 0);
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}
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void* _aligned_recalloc(void* memblock, size_t num, size_t size, size_t alignment)
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{
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return NULL;
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}
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void* _aligned_offset_malloc(size_t size, size_t alignment, size_t offset)
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{
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void* memptr, *tmpptr;
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struct _aligned_meminfo *ameminfo;
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/* alignment must be a power of 2 */
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if (alignment % 2 == 1)
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return NULL;
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/* offset must be less than size */
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if (offset >= size)
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return NULL;
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/* minimum alignment is pointer size */
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if (alignment < sizeof(void*))
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alignment = sizeof(void*);
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/* malloc size + alignment to make sure we can align afterwards */
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tmpptr = malloc(size + alignment + sizeof(struct _aligned_meminfo));
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if (!tmpptr)
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return NULL;
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memptr = (void *)((((size_t)((PBYTE)tmpptr + alignment + offset + sizeof(struct _aligned_meminfo)) & ~(alignment - 1)) - offset));
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ameminfo = (struct _aligned_meminfo*) (((size_t)((PBYTE)memptr - sizeof(struct _aligned_meminfo))));
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ameminfo->base_addr = tmpptr;
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ameminfo->size = size;
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return memptr;
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}
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void* _aligned_offset_realloc(void* memblock, size_t size, size_t alignment, size_t offset)
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{
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void* newmem;
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struct _aligned_meminfo* ameminfo;
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if (!memblock)
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return _aligned_offset_malloc(size, alignment, offset);
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if (size == 0)
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{
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_aligned_free(memblock);
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return NULL;
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}
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/* The following is not very performant but a simple and working solution */
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newmem = _aligned_offset_malloc(size, alignment, offset);
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if (!newmem)
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return NULL;
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ameminfo = (struct _aligned_meminfo*) (((size_t)((PBYTE)memblock - sizeof(struct _aligned_meminfo))));
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CopyMemory(newmem, memblock, ameminfo->size);
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_aligned_free(memblock);
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return newmem;
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}
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void* _aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t alignment, size_t offset)
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{
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return NULL;
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}
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size_t _aligned_msize(void* memblock, size_t alignment, size_t offset)
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{
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return 0;
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}
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void _aligned_free(void* memblock)
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{
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struct _aligned_meminfo* ameminfo;
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if (!memblock)
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return;
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ameminfo = (struct _aligned_meminfo*) (((size_t)((PBYTE)memblock - sizeof(struct _aligned_meminfo))));
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free(ameminfo->base_addr);
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}
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#endif
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