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