mirror of
https://github.com/cuberite/libdeflate.git
synced 2025-08-04 02:06:31 -04:00
4a0bb736c9
This allows these symbols to be overridden by another definition of these symbols somewhere else in the binary. Resolves https://github.com/ebiggers/libdeflate/issues/107
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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* utils.c - utility functions for libdeflate
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*
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* Copyright 2016 Eric Biggers
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "lib_common.h"
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#include "libdeflate.h"
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#ifdef FREESTANDING
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# define malloc NULL
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# define free NULL
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#else
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# include <stdlib.h>
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#endif
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static void *(*libdeflate_malloc_func)(size_t) = malloc;
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static void (*libdeflate_free_func)(void *) = free;
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void *
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libdeflate_malloc(size_t size)
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{
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return (*libdeflate_malloc_func)(size);
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}
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void
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libdeflate_free(void *ptr)
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{
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(*libdeflate_free_func)(ptr);
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}
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void *
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libdeflate_aligned_malloc(size_t alignment, size_t size)
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{
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void *ptr = libdeflate_malloc(sizeof(void *) + alignment - 1 + size);
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if (ptr) {
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void *orig_ptr = ptr;
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ptr = (void *)ALIGN((uintptr_t)ptr + sizeof(void *), alignment);
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((void **)ptr)[-1] = orig_ptr;
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}
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return ptr;
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}
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void
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libdeflate_aligned_free(void *ptr)
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{
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if (ptr)
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libdeflate_free(((void **)ptr)[-1]);
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}
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LIBDEFLATEEXPORT void LIBDEFLATEAPI
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libdeflate_set_memory_allocator(void *(*malloc_func)(size_t),
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void (*free_func)(void *))
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{
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libdeflate_malloc_func = malloc_func;
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libdeflate_free_func = free_func;
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}
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/*
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* Implementations of libc functions for freestanding library builds.
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* Normal library builds don't use these. Not optimized yet; usually the
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* compiler expands these functions and doesn't actually call them anyway.
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*/
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#ifdef FREESTANDING
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#undef memset
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void * __attribute__((weak))
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memset(void *s, int c, size_t n)
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{
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u8 *p = s;
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size_t i;
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for (i = 0; i < n; i++)
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p[i] = c;
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return s;
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}
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#undef memcpy
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void * __attribute__((weak))
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memcpy(void *dest, const void *src, size_t n)
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{
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u8 *d = dest;
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const u8 *s = src;
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size_t i;
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for (i = 0; i < n; i++)
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d[i] = s[i];
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return dest;
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}
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#undef memmove
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void * __attribute__((weak))
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memmove(void *dest, const void *src, size_t n)
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{
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u8 *d = dest;
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const u8 *s = src;
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size_t i;
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if (d <= s)
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return memcpy(d, s, n);
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for (i = n; i > 0; i--)
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d[i - 1] = s[i - 1];
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return dest;
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}
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#undef memcmp
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int __attribute__((weak))
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memcmp(const void *s1, const void *s2, size_t n)
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{
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const u8 *p1 = s1;
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const u8 *p2 = s2;
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size_t i;
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for (i = 0; i < n; i++) {
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if (p1[i] != p2[i])
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return (int)p1[i] - (int)p2[i];
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}
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return 0;
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}
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#endif /* FREESTANDING */
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