260 lines
6.3 KiB
C
260 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
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/*
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* Copyright (c) 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 both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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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> /* get_unaligned, put_unaligned* */
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#include <linux/compiler.h> /* inline */
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#include <linux/swab.h> /* swab32, swab64 */
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#include <linux/types.h> /* size_t, ptrdiff_t */
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#include "debug.h" /* DEBUG_STATIC_ASSERT */
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/*-****************************************
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* Compiler specifics
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******************************************/
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#define MEM_STATIC static inline
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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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/*-**************************************************************
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* Memory I/O API
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*****************************************************************/
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/*=== Static platform detection ===*/
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MEM_STATIC unsigned MEM_32bits(void);
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MEM_STATIC unsigned MEM_64bits(void);
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MEM_STATIC unsigned MEM_isLittleEndian(void);
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/*=== Native unaligned read/write ===*/
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MEM_STATIC U16 MEM_read16(const void* memPtr);
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MEM_STATIC U32 MEM_read32(const void* memPtr);
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MEM_STATIC U64 MEM_read64(const void* memPtr);
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MEM_STATIC size_t MEM_readST(const void* memPtr);
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MEM_STATIC void MEM_write16(void* memPtr, U16 value);
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MEM_STATIC void MEM_write32(void* memPtr, U32 value);
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MEM_STATIC void MEM_write64(void* memPtr, U64 value);
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/*=== Little endian unaligned read/write ===*/
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MEM_STATIC U16 MEM_readLE16(const void* memPtr);
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MEM_STATIC U32 MEM_readLE24(const void* memPtr);
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MEM_STATIC U32 MEM_readLE32(const void* memPtr);
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MEM_STATIC U64 MEM_readLE64(const void* memPtr);
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MEM_STATIC size_t MEM_readLEST(const void* memPtr);
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MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val);
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MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val);
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MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32);
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MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64);
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MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val);
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/*=== Big endian unaligned read/write ===*/
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MEM_STATIC U32 MEM_readBE32(const void* memPtr);
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MEM_STATIC U64 MEM_readBE64(const void* memPtr);
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MEM_STATIC size_t MEM_readBEST(const void* memPtr);
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MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32);
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MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64);
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MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val);
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/*=== Byteswap ===*/
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MEM_STATIC U32 MEM_swap32(U32 in);
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MEM_STATIC U64 MEM_swap64(U64 in);
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MEM_STATIC size_t MEM_swapST(size_t in);
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/*-**************************************************************
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* Memory I/O Implementation
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*****************************************************************/
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MEM_STATIC unsigned MEM_32bits(void)
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{
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return sizeof(size_t) == 4;
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}
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MEM_STATIC unsigned MEM_64bits(void)
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{
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return sizeof(size_t) == 8;
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}
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#if defined(__LITTLE_ENDIAN)
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#define MEM_LITTLE_ENDIAN 1
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#else
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#define MEM_LITTLE_ENDIAN 0
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#endif
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MEM_STATIC unsigned MEM_isLittleEndian(void)
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{
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return MEM_LITTLE_ENDIAN;
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}
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MEM_STATIC U16 MEM_read16(const void *memPtr)
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{
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return get_unaligned((const U16 *)memPtr);
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}
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MEM_STATIC U32 MEM_read32(const void *memPtr)
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{
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return get_unaligned((const U32 *)memPtr);
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}
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MEM_STATIC U64 MEM_read64(const void *memPtr)
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{
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return get_unaligned((const U64 *)memPtr);
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}
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MEM_STATIC size_t MEM_readST(const void *memPtr)
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{
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return get_unaligned((const size_t *)memPtr);
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}
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MEM_STATIC void MEM_write16(void *memPtr, U16 value)
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{
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put_unaligned(value, (U16 *)memPtr);
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}
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MEM_STATIC void MEM_write32(void *memPtr, U32 value)
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{
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put_unaligned(value, (U32 *)memPtr);
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}
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MEM_STATIC void MEM_write64(void *memPtr, U64 value)
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{
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put_unaligned(value, (U64 *)memPtr);
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}
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/*=== Little endian r/w ===*/
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MEM_STATIC U16 MEM_readLE16(const void *memPtr)
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{
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return get_unaligned_le16(memPtr);
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}
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MEM_STATIC void MEM_writeLE16(void *memPtr, U16 val)
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{
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put_unaligned_le16(val, memPtr);
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}
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MEM_STATIC U32 MEM_readLE24(const void *memPtr)
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{
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return MEM_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16);
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}
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MEM_STATIC void MEM_writeLE24(void *memPtr, U32 val)
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{
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MEM_writeLE16(memPtr, (U16)val);
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((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
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}
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MEM_STATIC U32 MEM_readLE32(const void *memPtr)
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{
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return get_unaligned_le32(memPtr);
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}
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MEM_STATIC void MEM_writeLE32(void *memPtr, U32 val32)
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{
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put_unaligned_le32(val32, memPtr);
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}
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MEM_STATIC U64 MEM_readLE64(const void *memPtr)
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{
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return get_unaligned_le64(memPtr);
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}
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MEM_STATIC void MEM_writeLE64(void *memPtr, U64 val64)
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{
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put_unaligned_le64(val64, memPtr);
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}
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MEM_STATIC size_t MEM_readLEST(const void *memPtr)
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{
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if (MEM_32bits())
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return (size_t)MEM_readLE32(memPtr);
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else
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return (size_t)MEM_readLE64(memPtr);
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}
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MEM_STATIC void MEM_writeLEST(void *memPtr, size_t val)
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{
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if (MEM_32bits())
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MEM_writeLE32(memPtr, (U32)val);
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else
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MEM_writeLE64(memPtr, (U64)val);
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}
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/*=== Big endian r/w ===*/
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MEM_STATIC U32 MEM_readBE32(const void *memPtr)
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{
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return get_unaligned_be32(memPtr);
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}
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MEM_STATIC void MEM_writeBE32(void *memPtr, U32 val32)
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{
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put_unaligned_be32(val32, memPtr);
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}
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MEM_STATIC U64 MEM_readBE64(const void *memPtr)
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{
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return get_unaligned_be64(memPtr);
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}
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MEM_STATIC void MEM_writeBE64(void *memPtr, U64 val64)
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{
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put_unaligned_be64(val64, memPtr);
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}
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MEM_STATIC size_t MEM_readBEST(const void *memPtr)
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{
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if (MEM_32bits())
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return (size_t)MEM_readBE32(memPtr);
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else
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return (size_t)MEM_readBE64(memPtr);
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}
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MEM_STATIC void MEM_writeBEST(void *memPtr, size_t val)
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{
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if (MEM_32bits())
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MEM_writeBE32(memPtr, (U32)val);
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else
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MEM_writeBE64(memPtr, (U64)val);
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}
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MEM_STATIC U32 MEM_swap32(U32 in)
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{
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return swab32(in);
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}
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MEM_STATIC U64 MEM_swap64(U64 in)
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{
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return swab64(in);
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}
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MEM_STATIC size_t MEM_swapST(size_t in)
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{
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if (MEM_32bits())
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return (size_t)MEM_swap32((U32)in);
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else
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return (size_t)MEM_swap64((U64)in);
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}
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#endif /* MEM_H_MODULE */
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