126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
|
||
|
|
/*
|
||
|
|
* Copyright (c) Facebook, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This source code is licensed under both the BSD-style license (found in the
|
||
|
|
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
|
||
|
|
* in the COPYING file in the root directory of this source tree).
|
||
|
|
* You may select, at your option, one of the above-listed licenses.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file provides common libc dependencies that zstd requires.
|
||
|
|
* The purpose is to allow replacing this file with a custom implementation
|
||
|
|
* to compile zstd without libc support.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Need:
|
||
|
|
* NULL
|
||
|
|
* INT_MAX
|
||
|
|
* UINT_MAX
|
||
|
|
* ZSTD_memcpy()
|
||
|
|
* ZSTD_memset()
|
||
|
|
* ZSTD_memmove()
|
||
|
|
*/
|
||
|
|
#ifndef ZSTD_DEPS_COMMON
|
||
|
|
#define ZSTD_DEPS_COMMON
|
||
|
|
|
||
|
|
#include <linux/limits.h>
|
||
|
|
#include <linux/stddef.h>
|
||
|
|
|
||
|
|
#define ZSTD_memcpy(d,s,n) __builtin_memcpy((d),(s),(n))
|
||
|
|
#define ZSTD_memmove(d,s,n) __builtin_memmove((d),(s),(n))
|
||
|
|
#define ZSTD_memset(d,s,n) __builtin_memset((d),(s),(n))
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_COMMON */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Define malloc as always failing. That means the user must
|
||
|
|
* either use ZSTD_customMem or statically allocate memory.
|
||
|
|
* Need:
|
||
|
|
* ZSTD_malloc()
|
||
|
|
* ZSTD_free()
|
||
|
|
* ZSTD_calloc()
|
||
|
|
*/
|
||
|
|
#ifdef ZSTD_DEPS_NEED_MALLOC
|
||
|
|
#ifndef ZSTD_DEPS_MALLOC
|
||
|
|
#define ZSTD_DEPS_MALLOC
|
||
|
|
|
||
|
|
#define ZSTD_malloc(s) ({ (void)(s); NULL; })
|
||
|
|
#define ZSTD_free(p) ((void)(p))
|
||
|
|
#define ZSTD_calloc(n,s) ({ (void)(n); (void)(s); NULL; })
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_MALLOC */
|
||
|
|
#endif /* ZSTD_DEPS_NEED_MALLOC */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Provides 64-bit math support.
|
||
|
|
* Need:
|
||
|
|
* U64 ZSTD_div64(U64 dividend, U32 divisor)
|
||
|
|
*/
|
||
|
|
#ifdef ZSTD_DEPS_NEED_MATH64
|
||
|
|
#ifndef ZSTD_DEPS_MATH64
|
||
|
|
#define ZSTD_DEPS_MATH64
|
||
|
|
|
||
|
|
#include <linux/math64.h>
|
||
|
|
|
||
|
|
static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) {
|
||
|
|
return div_u64(dividend, divisor);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_MATH64 */
|
||
|
|
#endif /* ZSTD_DEPS_NEED_MATH64 */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is only requested when DEBUGLEVEL >= 1, meaning
|
||
|
|
* it is disabled in production.
|
||
|
|
* Need:
|
||
|
|
* assert()
|
||
|
|
*/
|
||
|
|
#ifdef ZSTD_DEPS_NEED_ASSERT
|
||
|
|
#ifndef ZSTD_DEPS_ASSERT
|
||
|
|
#define ZSTD_DEPS_ASSERT
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
|
||
|
|
#define assert(x) WARN_ON((x))
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_ASSERT */
|
||
|
|
#endif /* ZSTD_DEPS_NEED_ASSERT */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This is only requested when DEBUGLEVEL >= 2, meaning
|
||
|
|
* it is disabled in production.
|
||
|
|
* Need:
|
||
|
|
* ZSTD_DEBUG_PRINT()
|
||
|
|
*/
|
||
|
|
#ifdef ZSTD_DEPS_NEED_IO
|
||
|
|
#ifndef ZSTD_DEPS_IO
|
||
|
|
#define ZSTD_DEPS_IO
|
||
|
|
|
||
|
|
#include <linux/printk.h>
|
||
|
|
|
||
|
|
#define ZSTD_DEBUG_PRINT(...) pr_debug(__VA_ARGS__)
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_IO */
|
||
|
|
#endif /* ZSTD_DEPS_NEED_IO */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Only requested when MSAN is enabled.
|
||
|
|
* Need:
|
||
|
|
* intptr_t
|
||
|
|
*/
|
||
|
|
#ifdef ZSTD_DEPS_NEED_STDINT
|
||
|
|
#ifndef ZSTD_DEPS_STDINT
|
||
|
|
#define ZSTD_DEPS_STDINT
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The Linux Kernel doesn't provide intptr_t, only uintptr_t, which
|
||
|
|
* is an unsigned long.
|
||
|
|
*/
|
||
|
|
typedef long intptr_t;
|
||
|
|
|
||
|
|
#endif /* ZSTD_DEPS_STDINT */
|
||
|
|
#endif /* ZSTD_DEPS_NEED_STDINT */
|