mirror of
https://git.wownero.com/wownero/wownero.git
synced 2024-12-26 13:38:53 +00:00
140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
// Copyright (c) 2017-2018, The Monero Project
|
|
//
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without modification, are
|
|
// permitted provided that the following conditions are met:
|
|
//
|
|
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
|
// conditions and the following disclaimer.
|
|
//
|
|
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
|
// of conditions and the following disclaimer in the documentation and/or other
|
|
// materials provided with the distribution.
|
|
//
|
|
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
|
// used to endorse or promote products derived from this software without specific
|
|
// prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
|
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
|
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include "aligned.h"
|
|
|
|
static inline int is_power_of_2(size_t n) { return n && (n & (n-1)) == 0; }
|
|
|
|
#define MAGIC 0xaa0817161500ff81
|
|
#define MAGIC_FREED 0xaa0817161500ff82
|
|
|
|
static void local_abort(const char *msg)
|
|
{
|
|
fprintf(stderr, "%s\n", msg);
|
|
#ifdef NDEBUG
|
|
_exit(1);
|
|
#else
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
uint64_t magic;
|
|
void *raw;
|
|
size_t bytes;
|
|
size_t align;
|
|
} control;
|
|
|
|
void *aligned_malloc(size_t bytes, size_t align)
|
|
{
|
|
void *raw, *ptr;
|
|
control *ctrl;
|
|
|
|
if (!is_power_of_2(align))
|
|
return NULL;
|
|
if (bytes > (size_t)-1 - align)
|
|
return NULL;
|
|
if (bytes + align > (size_t)-1 - sizeof(control))
|
|
return NULL;
|
|
|
|
raw = malloc(bytes + sizeof(control) + align);
|
|
if (!raw)
|
|
return NULL;
|
|
ptr = (void*)(((uintptr_t)raw + align + sizeof(control) - 1) & ~(align-1));
|
|
ctrl = ((control*)ptr) - 1;
|
|
ctrl->magic = MAGIC;
|
|
ctrl->raw = raw;
|
|
ctrl->bytes = bytes;
|
|
ctrl->align = align;
|
|
return ptr;
|
|
}
|
|
|
|
void *aligned_realloc(void *ptr, size_t bytes, size_t align)
|
|
{
|
|
void *raw, *ptr2;
|
|
control *ctrl, *ctrl2;
|
|
|
|
if (!ptr)
|
|
return aligned_malloc(bytes, align);
|
|
if (!bytes)
|
|
{
|
|
aligned_free(ptr);
|
|
return NULL;
|
|
}
|
|
if (!is_power_of_2(align))
|
|
return NULL;
|
|
|
|
ctrl = ((control*)ptr) - 1;
|
|
if (ctrl->magic == MAGIC_FREED)
|
|
local_abort("Double free detected");
|
|
if (ctrl->magic != MAGIC)
|
|
local_abort("Freeing unallocated memory");
|
|
if (ctrl->align != align)
|
|
return NULL;
|
|
if (ctrl->bytes >= bytes)
|
|
return ptr;
|
|
|
|
if (ctrl->bytes > (size_t)-1 - ctrl->align)
|
|
return NULL;
|
|
if (ctrl->bytes + ctrl->align > (size_t)-1 - sizeof(control))
|
|
return NULL;
|
|
|
|
raw = malloc(bytes + sizeof(control) + ctrl->align);
|
|
if (!raw)
|
|
return NULL;
|
|
ptr2 = (void*)(((uintptr_t)raw + ctrl->align + sizeof(control) - 1) & ~(ctrl->align-1));
|
|
memcpy(ptr2, ptr, ctrl->bytes);
|
|
ctrl2 = ((control*)ptr2) - 1;
|
|
ctrl2->magic = MAGIC;
|
|
ctrl2->raw = raw;
|
|
ctrl2->bytes = bytes;
|
|
ctrl2->align = ctrl->align;
|
|
ctrl->magic = MAGIC_FREED;
|
|
free(ctrl->raw);
|
|
return ptr2;
|
|
}
|
|
|
|
void aligned_free(void *ptr)
|
|
{
|
|
if (!ptr)
|
|
return;
|
|
control *ctrl = ((control*)ptr) - 1;
|
|
if (ctrl->magic == MAGIC_FREED)
|
|
local_abort("Double free detected");
|
|
if (ctrl->magic != MAGIC)
|
|
local_abort("Freeing unallocated memory");
|
|
ctrl->magic = MAGIC_FREED;
|
|
free(ctrl->raw);
|
|
}
|