152 строки
4.7 KiB
C
152 строки
4.7 KiB
C
/**
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of https://github.com/facebook/zstd.
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* An additional grant of patent rights can be found in the PATENTS file in the
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* same directory.
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation. This program is dual-licensed; you may select
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* either version 2 of the GNU General Public License ("GPL") or BSD license
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* ("BSD").
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*/
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#ifndef MEM_H_MODULE
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#define MEM_H_MODULE
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/*-****************************************
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* Dependencies
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******************************************/
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#include <asm/unaligned.h>
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#include <linux/string.h> /* memcpy */
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#include <linux/types.h> /* size_t, ptrdiff_t */
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/*-****************************************
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* Compiler specifics
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******************************************/
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#define ZSTD_STATIC static __inline __attribute__((unused))
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/*-**************************************************************
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* Basic Types
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*****************************************************************/
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typedef uint8_t BYTE;
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typedef uint16_t U16;
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typedef int16_t S16;
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typedef uint32_t U32;
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typedef int32_t S32;
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typedef uint64_t U64;
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typedef int64_t S64;
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typedef ptrdiff_t iPtrDiff;
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typedef uintptr_t uPtrDiff;
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/*-**************************************************************
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* Memory I/O
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*****************************************************************/
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ZSTD_STATIC unsigned ZSTD_32bits(void) { return sizeof(size_t) == 4; }
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ZSTD_STATIC unsigned ZSTD_64bits(void) { return sizeof(size_t) == 8; }
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#if defined(__LITTLE_ENDIAN)
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#define ZSTD_LITTLE_ENDIAN 1
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#else
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#define ZSTD_LITTLE_ENDIAN 0
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#endif
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ZSTD_STATIC unsigned ZSTD_isLittleEndian(void) { return ZSTD_LITTLE_ENDIAN; }
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ZSTD_STATIC U16 ZSTD_read16(const void *memPtr) { return get_unaligned((const U16 *)memPtr); }
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ZSTD_STATIC U32 ZSTD_read32(const void *memPtr) { return get_unaligned((const U32 *)memPtr); }
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ZSTD_STATIC U64 ZSTD_read64(const void *memPtr) { return get_unaligned((const U64 *)memPtr); }
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ZSTD_STATIC size_t ZSTD_readST(const void *memPtr) { return get_unaligned((const size_t *)memPtr); }
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ZSTD_STATIC void ZSTD_write16(void *memPtr, U16 value) { put_unaligned(value, (U16 *)memPtr); }
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ZSTD_STATIC void ZSTD_write32(void *memPtr, U32 value) { put_unaligned(value, (U32 *)memPtr); }
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ZSTD_STATIC void ZSTD_write64(void *memPtr, U64 value) { put_unaligned(value, (U64 *)memPtr); }
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/*=== Little endian r/w ===*/
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ZSTD_STATIC U16 ZSTD_readLE16(const void *memPtr) { return get_unaligned_le16(memPtr); }
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ZSTD_STATIC void ZSTD_writeLE16(void *memPtr, U16 val) { put_unaligned_le16(val, memPtr); }
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ZSTD_STATIC U32 ZSTD_readLE24(const void *memPtr) { return ZSTD_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16); }
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ZSTD_STATIC void ZSTD_writeLE24(void *memPtr, U32 val)
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{
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ZSTD_writeLE16(memPtr, (U16)val);
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((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
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}
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ZSTD_STATIC U32 ZSTD_readLE32(const void *memPtr) { return get_unaligned_le32(memPtr); }
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ZSTD_STATIC void ZSTD_writeLE32(void *memPtr, U32 val32) { put_unaligned_le32(val32, memPtr); }
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ZSTD_STATIC U64 ZSTD_readLE64(const void *memPtr) { return get_unaligned_le64(memPtr); }
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ZSTD_STATIC void ZSTD_writeLE64(void *memPtr, U64 val64) { put_unaligned_le64(val64, memPtr); }
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ZSTD_STATIC size_t ZSTD_readLEST(const void *memPtr)
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{
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if (ZSTD_32bits())
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return (size_t)ZSTD_readLE32(memPtr);
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else
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return (size_t)ZSTD_readLE64(memPtr);
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}
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ZSTD_STATIC void ZSTD_writeLEST(void *memPtr, size_t val)
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{
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if (ZSTD_32bits())
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ZSTD_writeLE32(memPtr, (U32)val);
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else
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ZSTD_writeLE64(memPtr, (U64)val);
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}
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/*=== Big endian r/w ===*/
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ZSTD_STATIC U32 ZSTD_readBE32(const void *memPtr) { return get_unaligned_be32(memPtr); }
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ZSTD_STATIC void ZSTD_writeBE32(void *memPtr, U32 val32) { put_unaligned_be32(val32, memPtr); }
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ZSTD_STATIC U64 ZSTD_readBE64(const void *memPtr) { return get_unaligned_be64(memPtr); }
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ZSTD_STATIC void ZSTD_writeBE64(void *memPtr, U64 val64) { put_unaligned_be64(val64, memPtr); }
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ZSTD_STATIC size_t ZSTD_readBEST(const void *memPtr)
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{
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if (ZSTD_32bits())
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return (size_t)ZSTD_readBE32(memPtr);
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else
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return (size_t)ZSTD_readBE64(memPtr);
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}
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ZSTD_STATIC void ZSTD_writeBEST(void *memPtr, size_t val)
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{
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if (ZSTD_32bits())
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ZSTD_writeBE32(memPtr, (U32)val);
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else
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ZSTD_writeBE64(memPtr, (U64)val);
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}
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/* function safe only for comparisons */
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ZSTD_STATIC U32 ZSTD_readMINMATCH(const void *memPtr, U32 length)
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{
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switch (length) {
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default:
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case 4: return ZSTD_read32(memPtr);
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case 3:
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if (ZSTD_isLittleEndian())
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return ZSTD_read32(memPtr) << 8;
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else
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return ZSTD_read32(memPtr) >> 8;
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}
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}
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#endif /* MEM_H_MODULE */
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