obs-studio/libobs/util/bmem.c

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/******************************************************************************
Copyright (c) 2013 by Hugh Bailey <obs.jim@gmail.com>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include "base.h"
#include "bmem.h"
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/*
* NOTE: totally jacked the mem alignment trick from ffmpeg, credit to them:
* http://www.ffmpeg.org/
*/
#define ALIGNMENT 16
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#if defined(_WIN32) && !defined(_WIN64)
#define ALIGNED_MALLOC 1
#elif !defined(__LP64__)
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#define ALIGNMENT_HACK 1
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#endif
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static void *a_malloc(size_t size)
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{
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#ifdef ALIGNED_MALLOC
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return _aligned_malloc(size, ALIGNMENT);
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#elif ALIGNMENT_HACK
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void *ptr = NULL;
long diff;
ptr = malloc(size + ALIGNMENT);
diff = ((~(long)ptr) & (ALIGNMENT - 1)) + 1;
ptr = (char *)ptr + diff;
((char *)ptr)[-1] = (char)diff;
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return ptr;
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#else
return malloc(size);
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#endif
}
static void *a_realloc(void *ptr, size_t size)
{
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#ifdef ALIGNED_MALLOC
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return _aligned_realloc(ptr, size, ALIGNMENT);
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#elif ALIGNMENT_HACK
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long diff;
if (!ptr)
return a_malloc(size);
diff = ((char *)ptr)[-1];
ptr = realloc((char*)ptr - diff, size + diff);
if (ptr)
ptr = (char *)ptr + diff;
return ptr;
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#else
return realloc(ptr, size);
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#endif
}
static void a_free(void *ptr)
{
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#ifdef ALIGNED_MALLOC
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_aligned_free(ptr);
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#elif ALIGNMENT_HACK
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if (ptr)
free((char *)ptr - ((char*)ptr)[-1]);
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#else
free(ptr);
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#endif
}
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static struct base_allocator alloc = {a_malloc, a_realloc, a_free};
static uint64_t num_allocs = 0;
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void base_set_allocator(struct base_allocator *defs)
{
memcpy(&alloc, defs, sizeof(struct base_allocator));
}
void *bmalloc(size_t size)
{
void *ptr = alloc.malloc(size);
if (!ptr && !size)
ptr = alloc.malloc(1);
if (!ptr)
bcrash("Out of memory while trying to allocate %lu bytes",
(unsigned long)size);
num_allocs++;
return ptr;
}
void *brealloc(void *ptr, size_t size)
{
if (!ptr)
num_allocs++;
ptr = alloc.realloc(ptr, size);
if (!ptr && !size)
ptr = alloc.realloc(ptr, 1);
if (!ptr)
bcrash("Out of memory while trying to allocate %lu bytes",
(unsigned long)size);
return ptr;
}
void bfree(void *ptr)
{
if (ptr)
num_allocs--;
alloc.free(ptr);
}
uint64_t bnum_allocs(void)
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{
return num_allocs;
}
void *bmemdup(const void *ptr, size_t size)
{
void *out = bmalloc(size);
if (size)
memcpy(out, ptr, size);
return out;
}