249 lines
8.1 KiB
C
249 lines
8.1 KiB
C
/*
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* The copyright in this software is being made available under the 2-clauses
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* BSD License, included below. This software may be subject to other third
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* party and contributor rights, including patent rights, and no such rights
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* are granted under this license.
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*
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* Copyright (c) 2015, Mathieu Malaterre <mathieu.malaterre@gmail.com>
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* Copyright (c) 2015, Matthieu Darbois
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define OPJ_SKIP_POISON
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#include "opj_includes.h"
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#if defined(OPJ_HAVE_MALLOC_H) && defined(OPJ_HAVE_MEMALIGN)
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# include <malloc.h>
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#endif
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#ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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#endif
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static INLINE void *opj_aligned_alloc_n(size_t alignment, size_t size)
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{
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void* ptr;
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/* alignment shall be power of 2 */
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assert((alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
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/* alignment shall be at least sizeof(void*) */
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assert(alignment >= sizeof(void*));
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if (size == 0U) { /* prevent implementation defined behavior of realloc */
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return NULL;
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}
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#if defined(OPJ_HAVE_POSIX_MEMALIGN)
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/* aligned_alloc requires c11, restrict to posix_memalign for now. Quote:
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* This function was introduced in POSIX 1003.1d. Although this function is
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* superseded by aligned_alloc, it is more portable to older POSIX systems
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* that do not support ISO C11. */
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if (posix_memalign(&ptr, alignment, size)) {
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ptr = NULL;
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}
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/* older linux */
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#elif defined(OPJ_HAVE_MEMALIGN)
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ptr = memalign(alignment, size);
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/* _MSC_VER */
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#elif defined(OPJ_HAVE__ALIGNED_MALLOC)
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ptr = _aligned_malloc(size, alignment);
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#else
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/*
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* Generic aligned malloc implementation.
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* Uses size_t offset for the integer manipulation of the pointer,
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* as uintptr_t is not available in C89 to do
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* bitwise operations on the pointer itself.
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*/
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alignment--;
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{
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size_t offset;
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OPJ_UINT8 *mem;
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/* Room for padding and extra pointer stored in front of allocated area */
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size_t overhead = alignment + sizeof(void *);
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/* let's be extra careful */
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assert(alignment <= (SIZE_MAX - sizeof(void *)));
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/* Avoid integer overflow */
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if (size > (SIZE_MAX - overhead)) {
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return NULL;
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}
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mem = (OPJ_UINT8*)malloc(size + overhead);
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if (mem == NULL) {
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return mem;
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}
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/* offset = ((alignment + 1U) - ((size_t)(mem + sizeof(void*)) & alignment)) & alignment; */
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/* Use the fact that alignment + 1U is a power of 2 */
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offset = ((alignment ^ ((size_t)(mem + sizeof(void*)) & alignment)) + 1U) &
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alignment;
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ptr = (void *)(mem + sizeof(void*) + offset);
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((void**) ptr)[-1] = mem;
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}
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#endif
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return ptr;
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}
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static INLINE void *opj_aligned_realloc_n(void *ptr, size_t alignment,
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size_t new_size)
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{
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void *r_ptr;
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/* alignment shall be power of 2 */
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assert((alignment != 0U) && ((alignment & (alignment - 1U)) == 0U));
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/* alignment shall be at least sizeof(void*) */
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assert(alignment >= sizeof(void*));
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if (new_size == 0U) { /* prevent implementation defined behavior of realloc */
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return NULL;
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}
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/* no portable aligned realloc */
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#if defined(OPJ_HAVE_POSIX_MEMALIGN) || defined(OPJ_HAVE_MEMALIGN)
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/* glibc doc states one can mix aligned malloc with realloc */
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r_ptr = realloc(ptr, new_size); /* fast path */
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/* we simply use `size_t` to cast, since we are only interest in binary AND
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* operator */
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if (((size_t)r_ptr & (alignment - 1U)) != 0U) {
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/* this is non-trivial to implement a portable aligned realloc, so use a
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* simple approach where we do not need a function that return the size of an
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* allocated array (eg. _msize on Windows, malloc_size on MacOS,
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* malloc_usable_size on systems with glibc) */
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void *a_ptr = opj_aligned_alloc_n(alignment, new_size);
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if (a_ptr != NULL) {
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memcpy(a_ptr, r_ptr, new_size);
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}
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free(r_ptr);
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r_ptr = a_ptr;
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}
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/* _MSC_VER */
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#elif defined(OPJ_HAVE__ALIGNED_MALLOC)
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r_ptr = _aligned_realloc(ptr, new_size, alignment);
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#else
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if (ptr == NULL) {
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return opj_aligned_alloc_n(alignment, new_size);
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}
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alignment--;
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{
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void *oldmem;
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OPJ_UINT8 *newmem;
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size_t overhead = alignment + sizeof(void *);
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/* let's be extra careful */
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assert(alignment <= (SIZE_MAX - sizeof(void *)));
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/* Avoid integer overflow */
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if (new_size > SIZE_MAX - overhead) {
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return NULL;
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}
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oldmem = ((void**) ptr)[-1];
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newmem = (OPJ_UINT8*)realloc(oldmem, new_size + overhead);
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if (newmem == NULL) {
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return newmem;
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}
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if (newmem == oldmem) {
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r_ptr = ptr;
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} else {
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size_t old_offset;
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size_t new_offset;
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/* realloc created a new copy, realign the copied memory block */
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old_offset = (size_t)((OPJ_UINT8*)ptr - (OPJ_UINT8*)oldmem);
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/* offset = ((alignment + 1U) - ((size_t)(mem + sizeof(void*)) & alignment)) & alignment; */
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/* Use the fact that alignment + 1U is a power of 2 */
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new_offset = ((alignment ^ ((size_t)(newmem + sizeof(void*)) & alignment)) +
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1U) & alignment;
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new_offset += sizeof(void*);
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r_ptr = (void *)(newmem + new_offset);
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if (new_offset != old_offset) {
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memmove(newmem + new_offset, newmem + old_offset, new_size);
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}
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((void**) r_ptr)[-1] = newmem;
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}
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}
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#endif
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return r_ptr;
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}
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void * opj_malloc(size_t size)
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{
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if (size == 0U) { /* prevent implementation defined behavior of realloc */
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return NULL;
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}
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return malloc(size);
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}
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void * opj_calloc(size_t num, size_t size)
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{
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if (num == 0 || size == 0) {
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/* prevent implementation defined behavior of realloc */
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return NULL;
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}
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return calloc(num, size);
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}
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void *opj_aligned_malloc(size_t size)
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{
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return opj_aligned_alloc_n(16U, size);
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}
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void * opj_aligned_realloc(void *ptr, size_t size)
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{
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return opj_aligned_realloc_n(ptr, 16U, size);
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}
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void *opj_aligned_32_malloc(size_t size)
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{
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return opj_aligned_alloc_n(32U, size);
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}
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void * opj_aligned_32_realloc(void *ptr, size_t size)
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{
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return opj_aligned_realloc_n(ptr, 32U, size);
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}
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void opj_aligned_free(void* ptr)
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{
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#if defined(OPJ_HAVE_POSIX_MEMALIGN) || defined(OPJ_HAVE_MEMALIGN)
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free(ptr);
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#elif defined(OPJ_HAVE__ALIGNED_MALLOC)
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_aligned_free(ptr);
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#else
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/* Generic implementation has malloced pointer stored in front of used area */
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if (ptr != NULL) {
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free(((void**) ptr)[-1]);
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}
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#endif
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}
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void * opj_realloc(void *ptr, size_t new_size)
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{
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if (new_size == 0U) { /* prevent implementation defined behavior of realloc */
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return NULL;
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}
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return realloc(ptr, new_size);
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}
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void opj_free(void *ptr)
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{
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free(ptr);
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}
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