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259 lines
6.3 KiB
259 lines
6.3 KiB
/* 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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