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133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
//===- SwapByteOrder.h - Generic and optimized byte swaps -------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares generic and optimized functions to swap the byte order of
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// an integral type.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_SWAPBYTEORDER_H
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#define LLVM_SUPPORT_SWAPBYTEORDER_H
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/DataTypes.h"
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#include <cstddef>
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#include <type_traits>
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#if defined(_MSC_VER) && !defined(_DEBUG)
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#include <stdlib.h>
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#endif
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namespace llvm {
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namespace sys {
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/// SwapByteOrder_16 - This function returns a byte-swapped representation of
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/// the 16-bit argument.
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inline uint16_t SwapByteOrder_16(uint16_t value) {
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#if defined(_MSC_VER) && !defined(_DEBUG)
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// The DLL version of the runtime lacks these functions (bug!?), but in a
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// release build they're replaced with BSWAP instructions anyway.
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return _byteswap_ushort(value);
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#else
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uint16_t Hi = value << 8;
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uint16_t Lo = value >> 8;
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return Hi | Lo;
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#endif
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}
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/// This function returns a byte-swapped representation of the 32-bit argument.
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inline uint32_t SwapByteOrder_32(uint32_t value) {
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#if defined(__llvm__) || (defined(__GNUC__) && !defined(__ICC))
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return __builtin_bswap32(value);
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#elif defined(_MSC_VER) && !defined(_DEBUG)
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return _byteswap_ulong(value);
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#else
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uint32_t Byte0 = value & 0x000000FF;
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uint32_t Byte1 = value & 0x0000FF00;
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uint32_t Byte2 = value & 0x00FF0000;
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uint32_t Byte3 = value & 0xFF000000;
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return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
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#endif
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}
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/// This function returns a byte-swapped representation of the 64-bit argument.
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inline uint64_t SwapByteOrder_64(uint64_t value) {
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#if defined(__llvm__) || (defined(__GNUC__) && !defined(__ICC))
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return __builtin_bswap64(value);
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#elif defined(_MSC_VER) && !defined(_DEBUG)
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return _byteswap_uint64(value);
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#else
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uint64_t Hi = SwapByteOrder_32(uint32_t(value));
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uint32_t Lo = SwapByteOrder_32(uint32_t(value >> 32));
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return (Hi << 32) | Lo;
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#endif
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}
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inline unsigned char getSwappedBytes(unsigned char C) { return C; }
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inline signed char getSwappedBytes(signed char C) { return C; }
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inline char getSwappedBytes(char C) { return C; }
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inline unsigned short getSwappedBytes(unsigned short C) { return SwapByteOrder_16(C); }
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inline signed short getSwappedBytes( signed short C) { return SwapByteOrder_16(C); }
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inline unsigned int getSwappedBytes(unsigned int C) { return SwapByteOrder_32(C); }
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inline signed int getSwappedBytes( signed int C) { return SwapByteOrder_32(C); }
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#if __LONG_MAX__ == __INT_MAX__
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inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_32(C); }
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inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_32(C); }
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#elif __LONG_MAX__ == __LONG_LONG_MAX__
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inline unsigned long getSwappedBytes(unsigned long C) { return SwapByteOrder_64(C); }
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inline signed long getSwappedBytes( signed long C) { return SwapByteOrder_64(C); }
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#else
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#error "Unknown long size!"
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#endif
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inline unsigned long long getSwappedBytes(unsigned long long C) {
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return SwapByteOrder_64(C);
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}
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inline signed long long getSwappedBytes(signed long long C) {
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return SwapByteOrder_64(C);
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}
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inline float getSwappedBytes(float C) {
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union {
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uint32_t i;
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float f;
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} in, out;
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in.f = C;
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out.i = SwapByteOrder_32(in.i);
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return out.f;
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}
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inline double getSwappedBytes(double C) {
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union {
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uint64_t i;
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double d;
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} in, out;
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in.d = C;
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out.i = SwapByteOrder_64(in.i);
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return out.d;
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}
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template <typename T>
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inline typename std::enable_if<std::is_enum<T>::value, T>::type
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getSwappedBytes(T C) {
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return static_cast<T>(
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getSwappedBytes(static_cast<typename std::underlying_type<T>::type>(C)));
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}
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template<typename T>
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inline void swapByteOrder(T &Value) {
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Value = getSwappedBytes(Value);
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}
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} // end namespace sys
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} // end namespace llvm
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#endif
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