163 lines
4.6 KiB
C
163 lines
4.6 KiB
C
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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*/
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/*-
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* Copyright 2007-2009 Colin Percival
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file was originally written by Colin Percival as part of the Tarsnap
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* online backup system.
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*/
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#ifndef _SYSENDIAN_H_
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#define _SYSENDIAN_H_
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/* If we don't have be64enc, the <sys/endian.h> we have isn't usable. */
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#if !HAVE_DECL_BE64ENC
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#undef HAVE_SYS_ENDIAN_H
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#endif
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#ifdef HAVE_SYS_ENDIAN_H
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#include <sys/endian.h>
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#else
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#include <stdint.h>
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static inline uint32_t
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be32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint32_t)(p[3]) + ((uint32_t)(p[2]) << 8) +
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((uint32_t)(p[1]) << 16) + ((uint32_t)(p[0]) << 24));
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}
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static inline void
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be32enc(void *pp, uint32_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[3] = x & 0xff;
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p[2] = (x >> 8) & 0xff;
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p[1] = (x >> 16) & 0xff;
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p[0] = (x >> 24) & 0xff;
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}
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static inline uint64_t
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be64dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint64_t)(p[7]) + ((uint64_t)(p[6]) << 8) +
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((uint64_t)(p[5]) << 16) + ((uint64_t)(p[4]) << 24) +
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((uint64_t)(p[3]) << 32) + ((uint64_t)(p[2]) << 40) +
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((uint64_t)(p[1]) << 48) + ((uint64_t)(p[0]) << 56));
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}
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static inline void
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be64enc(void *pp, uint64_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[7] = x & 0xff;
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p[6] = (x >> 8) & 0xff;
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p[5] = (x >> 16) & 0xff;
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p[4] = (x >> 24) & 0xff;
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p[3] = (x >> 32) & 0xff;
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p[2] = (x >> 40) & 0xff;
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p[1] = (x >> 48) & 0xff;
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p[0] = (x >> 56) & 0xff;
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}
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static inline uint32_t
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le32dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint32_t)(p[0]) + ((uint32_t)(p[1]) << 8) +
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((uint32_t)(p[2]) << 16) + ((uint32_t)(p[3]) << 24));
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}
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static inline void
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le32enc(void *pp, uint32_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[0] = x & 0xff;
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p[1] = (x >> 8) & 0xff;
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p[2] = (x >> 16) & 0xff;
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p[3] = (x >> 24) & 0xff;
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}
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static inline uint64_t
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le64dec(const void *pp)
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{
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const uint8_t *p = (uint8_t const *)pp;
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return ((uint64_t)(p[0]) + ((uint64_t)(p[1]) << 8) +
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((uint64_t)(p[2]) << 16) + ((uint64_t)(p[3]) << 24) +
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((uint64_t)(p[4]) << 32) + ((uint64_t)(p[5]) << 40) +
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((uint64_t)(p[6]) << 48) + ((uint64_t)(p[7]) << 56));
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}
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static inline void
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le64enc(void *pp, uint64_t x)
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{
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uint8_t * p = (uint8_t *)pp;
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p[0] = x & 0xff;
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p[1] = (x >> 8) & 0xff;
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p[2] = (x >> 16) & 0xff;
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p[3] = (x >> 24) & 0xff;
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p[4] = (x >> 32) & 0xff;
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p[5] = (x >> 40) & 0xff;
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p[6] = (x >> 48) & 0xff;
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p[7] = (x >> 56) & 0xff;
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}
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#endif /* !HAVE_SYS_ENDIAN_H */
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#endif /* !_SYSENDIAN_H_ */
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