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Diffstat (limited to '')
| -rw-r--r-- | lib/zstd/common/mem.h | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/lib/zstd/common/mem.h b/lib/zstd/common/mem.h new file mode 100644 index 000000000..dcdd586a9 --- /dev/null +++ b/lib/zstd/common/mem.h @@ -0,0 +1,259 @@ +/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */ +/* + * Copyright (c) Yann Collet, 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. + */ + +#ifndef MEM_H_MODULE +#define MEM_H_MODULE + +/*-**************************************** +* Dependencies +******************************************/ +#include <asm/unaligned.h> /* get_unaligned, put_unaligned* */ +#include <linux/compiler.h> /* inline */ +#include <linux/swab.h> /* swab32, swab64 */ +#include <linux/types.h> /* size_t, ptrdiff_t */ +#include "debug.h" /* DEBUG_STATIC_ASSERT */ + +/*-**************************************** +* Compiler specifics +******************************************/ +#define MEM_STATIC static inline + +/*-************************************************************** +* Basic Types +*****************************************************************/ +typedef uint8_t BYTE; +typedef uint16_t U16; +typedef int16_t S16; +typedef uint32_t U32; +typedef int32_t S32; +typedef uint64_t U64; +typedef int64_t S64; + +/*-************************************************************** +* Memory I/O API +*****************************************************************/ +/*=== Static platform detection ===*/ +MEM_STATIC unsigned MEM_32bits(void); +MEM_STATIC unsigned MEM_64bits(void); +MEM_STATIC unsigned MEM_isLittleEndian(void); + +/*=== Native unaligned read/write ===*/ +MEM_STATIC U16 MEM_read16(const void* memPtr); +MEM_STATIC U32 MEM_read32(const void* memPtr); +MEM_STATIC U64 MEM_read64(const void* memPtr); +MEM_STATIC size_t MEM_readST(const void* memPtr); + +MEM_STATIC void MEM_write16(void* memPtr, U16 value); +MEM_STATIC void MEM_write32(void* memPtr, U32 value); +MEM_STATIC void MEM_write64(void* memPtr, U64 value); + +/*=== Little endian unaligned read/write ===*/ +MEM_STATIC U16 MEM_readLE16(const void* memPtr); +MEM_STATIC U32 MEM_readLE24(const void* memPtr); +MEM_STATIC U32 MEM_readLE32(const void* memPtr); +MEM_STATIC U64 MEM_readLE64(const void* memPtr); +MEM_STATIC size_t MEM_readLEST(const void* memPtr); + +MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val); +MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val); +MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32); +MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64); +MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val); + +/*=== Big endian unaligned read/write ===*/ +MEM_STATIC U32 MEM_readBE32(const void* memPtr); +MEM_STATIC U64 MEM_readBE64(const void* memPtr); +MEM_STATIC size_t MEM_readBEST(const void* memPtr); + +MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32); +MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64); +MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val); + +/*=== Byteswap ===*/ +MEM_STATIC U32 MEM_swap32(U32 in); +MEM_STATIC U64 MEM_swap64(U64 in); +MEM_STATIC size_t MEM_swapST(size_t in); + +/*-************************************************************** +* Memory I/O Implementation +*****************************************************************/ +MEM_STATIC unsigned MEM_32bits(void) +{ + return sizeof(size_t) == 4; +} + +MEM_STATIC unsigned MEM_64bits(void) +{ + return sizeof(size_t) == 8; +} + +#if defined(__LITTLE_ENDIAN) +#define MEM_LITTLE_ENDIAN 1 +#else +#define MEM_LITTLE_ENDIAN 0 +#endif + +MEM_STATIC unsigned MEM_isLittleEndian(void) +{ + return MEM_LITTLE_ENDIAN; +} + +MEM_STATIC U16 MEM_read16(const void *memPtr) +{ + return get_unaligned((const U16 *)memPtr); +} + +MEM_STATIC U32 MEM_read32(const void *memPtr) +{ + return get_unaligned((const U32 *)memPtr); +} + +MEM_STATIC U64 MEM_read64(const void *memPtr) +{ + return get_unaligned((const U64 *)memPtr); +} + +MEM_STATIC size_t MEM_readST(const void *memPtr) +{ + return get_unaligned((const size_t *)memPtr); +} + +MEM_STATIC void MEM_write16(void *memPtr, U16 value) +{ + put_unaligned(value, (U16 *)memPtr); +} + +MEM_STATIC void MEM_write32(void *memPtr, U32 value) +{ + put_unaligned(value, (U32 *)memPtr); +} + +MEM_STATIC void MEM_write64(void *memPtr, U64 value) +{ + put_unaligned(value, (U64 *)memPtr); +} + +/*=== Little endian r/w ===*/ + +MEM_STATIC U16 MEM_readLE16(const void *memPtr) +{ + return get_unaligned_le16(memPtr); +} + +MEM_STATIC void MEM_writeLE16(void *memPtr, U16 val) +{ + put_unaligned_le16(val, memPtr); +} + +MEM_STATIC U32 MEM_readLE24(const void *memPtr) +{ + return MEM_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16); +} + +MEM_STATIC void MEM_writeLE24(void *memPtr, U32 val) +{ + MEM_writeLE16(memPtr, (U16)val); + ((BYTE *)memPtr)[2] = (BYTE)(val >> 16); +} + +MEM_STATIC U32 MEM_readLE32(const void *memPtr) +{ + return get_unaligned_le32(memPtr); +} + +MEM_STATIC void MEM_writeLE32(void *memPtr, U32 val32) +{ + put_unaligned_le32(val32, memPtr); +} + +MEM_STATIC U64 MEM_readLE64(const void *memPtr) +{ + return get_unaligned_le64(memPtr); +} + +MEM_STATIC void MEM_writeLE64(void *memPtr, U64 val64) +{ + put_unaligned_le64(val64, memPtr); +} + +MEM_STATIC size_t MEM_readLEST(const void *memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readLE32(memPtr); + else + return (size_t)MEM_readLE64(memPtr); +} + +MEM_STATIC void MEM_writeLEST(void *memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeLE32(memPtr, (U32)val); + else + MEM_writeLE64(memPtr, (U64)val); +} + +/*=== Big endian r/w ===*/ + +MEM_STATIC U32 MEM_readBE32(const void *memPtr) +{ + return get_unaligned_be32(memPtr); +} + +MEM_STATIC void MEM_writeBE32(void *memPtr, U32 val32) +{ + put_unaligned_be32(val32, memPtr); +} + +MEM_STATIC U64 MEM_readBE64(const void *memPtr) +{ + return get_unaligned_be64(memPtr); +} + +MEM_STATIC void MEM_writeBE64(void *memPtr, U64 val64) +{ + put_unaligned_be64(val64, memPtr); +} + +MEM_STATIC size_t MEM_readBEST(const void *memPtr) +{ + if (MEM_32bits()) + return (size_t)MEM_readBE32(memPtr); + else + return (size_t)MEM_readBE64(memPtr); +} + +MEM_STATIC void MEM_writeBEST(void *memPtr, size_t val) +{ + if (MEM_32bits()) + MEM_writeBE32(memPtr, (U32)val); + else + MEM_writeBE64(memPtr, (U64)val); +} + +MEM_STATIC U32 MEM_swap32(U32 in) +{ + return swab32(in); +} + +MEM_STATIC U64 MEM_swap64(U64 in) +{ + return swab64(in); +} + +MEM_STATIC size_t MEM_swapST(size_t in) +{ + if (MEM_32bits()) + return (size_t)MEM_swap32((U32)in); + else + return (size_t)MEM_swap64((U64)in); +} + +#endif /* MEM_H_MODULE */ |