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/*
* utils.c - utility functions for libdeflate
*
* Copyright 2016 Eric Biggers
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "lib_common.h"
#include "libdeflate.h"
#ifdef FREESTANDING
# define malloc NULL
# define free NULL
#else
# include <stdlib.h>
#endif
static void *(*libdeflate_malloc_func)(size_t) = malloc;
static void (*libdeflate_free_func)(void *) = free;
void *
libdeflate_malloc(size_t size)
{
return (*libdeflate_malloc_func)(size);
}
void
libdeflate_free(void *ptr)
{
(*libdeflate_free_func)(ptr);
}
void *
libdeflate_aligned_malloc(size_t alignment, size_t size)
{
void *ptr = libdeflate_malloc(sizeof(void *) + alignment - 1 + size);
if (ptr) {
void *orig_ptr = ptr;
ptr = (void *)ALIGN((uintptr_t)ptr + sizeof(void *), alignment);
((void **)ptr)[-1] = orig_ptr;
}
return ptr;
}
void
libdeflate_aligned_free(void *ptr)
{
if (ptr)
libdeflate_free(((void **)ptr)[-1]);
}
LIBDEFLATEEXPORT void LIBDEFLATEAPI
libdeflate_set_memory_allocator(void *(*malloc_func)(size_t),
void (*free_func)(void *))
{
libdeflate_malloc_func = malloc_func;
libdeflate_free_func = free_func;
}
/*
* Implementations of libc functions for freestanding library builds.
* Normal library builds don't use these. Not optimized yet; usually the
* compiler expands these functions and doesn't actually call them anyway.
*/
#ifdef FREESTANDING
#undef memset
void * __attribute__((weak))
memset(void *s, int c, size_t n)
{
u8 *p = s;
size_t i;
for (i = 0; i < n; i++)
p[i] = c;
return s;
}
#undef memcpy
void * __attribute__((weak))
memcpy(void *dest, const void *src, size_t n)
{
u8 *d = dest;
const u8 *s = src;
size_t i;
for (i = 0; i < n; i++)
d[i] = s[i];
return dest;
}
#undef memmove
void * __attribute__((weak))
memmove(void *dest, const void *src, size_t n)
{
u8 *d = dest;
const u8 *s = src;
size_t i;
if (d <= s)
return memcpy(d, s, n);
for (i = n; i > 0; i--)
d[i - 1] = s[i - 1];
return dest;
}
#undef memcmp
int __attribute__((weak))
memcmp(const void *s1, const void *s2, size_t n)
{
const u8 *p1 = s1;
const u8 *p2 = s2;
size_t i;
for (i = 0; i < n; i++) {
if (p1[i] != p2[i])
return (int)p1[i] - (int)p2[i];
}
return 0;
}
#endif /* FREESTANDING */
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