76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
|
/**
|
||
|
|
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the BSD-style license found in the
|
||
|
|
* LICENSE file in the root directory of https://github.com/facebook/zstd.
|
||
|
|
* An additional grant of patent rights can be found in the PATENTS file in the
|
||
|
|
* same directory.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it under
|
||
|
|
* the terms of the GNU General Public License version 2 as published by the
|
||
|
|
* Free Software Foundation. This program is dual-licensed; you may select
|
||
|
|
* either version 2 of the GNU General Public License ("GPL") or BSD license
|
||
|
|
* ("BSD").
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*-*************************************
|
||
|
|
* Dependencies
|
||
|
|
***************************************/
|
||
|
|
#include "error_private.h"
|
||
|
|
#include "zstd_internal.h" /* declaration of ZSTD_isError, ZSTD_getErrorName, ZSTD_getErrorCode, ZSTD_getErrorString, ZSTD_versionNumber */
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
|
||
|
|
/*=**************************************************************
|
||
|
|
* Custom allocator
|
||
|
|
****************************************************************/
|
||
|
|
|
||
|
|
#define stack_push(stack, size) \
|
||
|
|
({ \
|
||
|
|
void *const ptr = ZSTD_PTR_ALIGN((stack)->ptr); \
|
||
|
|
(stack)->ptr = (char *)ptr + (size); \
|
||
|
|
(stack)->ptr <= (stack)->end ? ptr : NULL; \
|
||
|
|
})
|
||
|
|
|
||
|
|
ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize)
|
||
|
|
{
|
||
|
|
ZSTD_customMem stackMem = {ZSTD_stackAlloc, ZSTD_stackFree, workspace};
|
||
|
|
ZSTD_stack *stack = (ZSTD_stack *)workspace;
|
||
|
|
/* Verify preconditions */
|
||
|
|
if (!workspace || workspaceSize < sizeof(ZSTD_stack) || workspace != ZSTD_PTR_ALIGN(workspace)) {
|
||
|
|
ZSTD_customMem error = {NULL, NULL, NULL};
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
/* Initialize the stack */
|
||
|
|
stack->ptr = workspace;
|
||
|
|
stack->end = (char *)workspace + workspaceSize;
|
||
|
|
stack_push(stack, sizeof(ZSTD_stack));
|
||
|
|
return stackMem;
|
||
|
|
}
|
||
|
|
|
||
|
|
void *ZSTD_stackAllocAll(void *opaque, size_t *size)
|
||
|
|
{
|
||
|
|
ZSTD_stack *stack = (ZSTD_stack *)opaque;
|
||
|
|
*size = (BYTE const *)stack->end - (BYTE *)ZSTD_PTR_ALIGN(stack->ptr);
|
||
|
|
return stack_push(stack, *size);
|
||
|
|
}
|
||
|
|
|
||
|
|
void *ZSTD_stackAlloc(void *opaque, size_t size)
|
||
|
|
{
|
||
|
|
ZSTD_stack *stack = (ZSTD_stack *)opaque;
|
||
|
|
return stack_push(stack, size);
|
||
|
|
}
|
||
|
|
void ZSTD_stackFree(void *opaque, void *address)
|
||
|
|
{
|
||
|
|
(void)opaque;
|
||
|
|
(void)address;
|
||
|
|
}
|
||
|
|
|
||
|
|
void *ZSTD_malloc(size_t size, ZSTD_customMem customMem) { return customMem.customAlloc(customMem.opaque, size); }
|
||
|
|
|
||
|
|
void ZSTD_free(void *ptr, ZSTD_customMem customMem)
|
||
|
|
{
|
||
|
|
if (ptr != NULL)
|
||
|
|
customMem.customFree(customMem.opaque, ptr);
|
||
|
|
}
|