/
endian_swap.h
160 lines (145 loc) · 4.07 KB
/
endian_swap.h
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/*
* Copyright 2011, Ben Langmead <langmea@cs.jhu.edu>
*
* This file is part of Bowtie 2.
*
* Bowtie 2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Bowtie 2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Bowtie 2. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ENDIAN_SWAP_H
#define ENDIAN_SWAP_H
#include <stdint.h>
#include <inttypes.h>
/**
* Return true iff the machine running this program is big-endian.
*/
static inline bool currentlyBigEndian() {
static uint8_t endianCheck[] = {1, 0, 0, 0};
return *((uint32_t*)endianCheck) != 1;
}
/**
* Return copy of uint32_t argument with byte order reversed.
*/
static inline uint16_t endianSwapU16(uint16_t u) {
uint16_t tmp = 0;
tmp |= ((u >> 8) & (0xff << 0));
tmp |= ((u << 8) & (0xff << 8));
return tmp;
}
/**
* Return copy of uint32_t argument with byte order reversed.
*/
static inline uint32_t endianSwapU32(uint32_t u) {
uint32_t tmp = 0;
tmp |= ((u >> 24) & (0xff << 0));
tmp |= ((u >> 8) & (0xff << 8));
tmp |= ((u << 8) & (0xff << 16));
tmp |= ((u << 24) & (0xff << 24));
return tmp;
}
/**
* Return copy of uint64_t argument with byte order reversed.
*/
static inline uint64_t endianSwapU64(uint64_t u) {
uint64_t tmp = 0;
tmp |= ((u >> 56) & (0xffull << 0));
tmp |= ((u >> 40) & (0xffull << 8));
tmp |= ((u >> 24) & (0xffull << 16));
tmp |= ((u >> 8) & (0xffull << 24));
tmp |= ((u << 8) & (0xffull << 32));
tmp |= ((u << 24) & (0xffull << 40));
tmp |= ((u << 40) & (0xffull << 48));
tmp |= ((u << 56) & (0xffull << 56));
return tmp;
}
/**
* Return copy of uint_t argument with byte order reversed.
*/
template <typename index_t>
static inline index_t endianSwapIndex(index_t u) {
if(sizeof(index_t) == 8) {
return (index_t)endianSwapU64(u);
} else if(sizeof(index_t) == 4) {
return endianSwapU32((uint32_t)u);
} else {
return endianSwapU16(u);
}
}
/**
* Return copy of int16_t argument with byte order reversed.
*/
static inline int16_t endianSwapI16(int16_t i) {
int16_t tmp = 0;
tmp |= ((i >> 8) & (0xff << 0));
tmp |= ((i << 8) & (0xff << 8));
return tmp;
}
/**
* Convert uint16_t argument to the specified endianness. It's assumed
* that u currently has the endianness of the current machine.
*/
static inline uint16_t endianizeU16(uint16_t u, bool toBig) {
if(toBig == currentlyBigEndian()) {
return u;
}
return endianSwapU16(u);
}
/**
* Convert int16_t argument to the specified endianness. It's assumed
* that u currently has the endianness of the current machine.
*/
static inline int16_t endianizeI16(int16_t i, bool toBig) {
if(toBig == currentlyBigEndian()) {
return i;
}
return endianSwapI16(i);
}
/**
* Return copy of int32_t argument with byte order reversed.
*/
static inline int32_t endianSwapI32(int32_t i) {
int32_t tmp = 0;
tmp |= ((i >> 24) & (0xff << 0));
tmp |= ((i >> 8) & (0xff << 8));
tmp |= ((i << 8) & (0xff << 16));
tmp |= ((i << 24) & (0xff << 24));
return tmp;
}
/**
* Convert uint32_t argument to the specified endianness. It's assumed
* that u currently has the endianness of the current machine.
*/
static inline uint32_t endianizeU32(uint32_t u, bool toBig) {
if(toBig == currentlyBigEndian()) {
return u;
}
return endianSwapU32(u);
}
/**
* Convert int32_t argument to the specified endianness. It's assumed
* that u currently has the endianness of the current machine.
*/
static inline int32_t endianizeI32(int32_t i, bool toBig) {
if(toBig == currentlyBigEndian()) {
return i;
}
return endianSwapI32(i);
}
template <typename index_t>
index_t endianizeIndex(index_t u, bool toBig) {
if(toBig == currentlyBigEndian()) {
return u;
}
return endianSwapIndex(u);
}
#endif