121 lines
3.1 KiB
C
121 lines
3.1 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 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 2.1 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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* moinakg@belenix.org, http://moinakg.wordpress.com/
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*
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* This program includes partly-modified public domain source
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* code from the LZMA SDK: http://www.7-zip.org/sdk.html
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*/
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#ifndef _UTILS_H
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#define _UTILS_H
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#include <arpa/nameser_compat.h>
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(sun) && !defined(__sun)
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#define ulong_t u_long
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#define uchar_t u_char
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#define uint8_t u_char
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#define uint64_t u_int64_t
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#define uint32_t u_int32_t
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#endif
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#if ULONG_MAX == 4294967295UL
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# ifndef UINT64_C
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# define UINT64_C(n) n ## ULL
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# endif
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#else
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# ifndef UINT64_C
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# define UINT64_C(n) n ## UL
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# endif
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#endif
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typedef unsigned long uintptr_t;
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#undef WORDS_BIGENDIAN
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#if BYTE_ORDER == BIG_ENDIAN
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# define WORDS_BIGENDIAN
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# ifndef htonll
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# define htonll(x) (x)
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# endif
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# ifndef ntonll
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# define ntohll(x) (x)
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# endif
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#else
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# if !defined(sun) && !defined (__sun)
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# ifndef htonll
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# define htonll(x) __bswap_64(x)
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# endif
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# ifndef ntohll
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# define ntohll(x) __bswap_64(x)
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# endif
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# endif
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#endif
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// These allow helping the compiler in some often-executed branches, whose
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// result is almost always the same.
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#ifdef __GNUC__
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# define likely(expr) __builtin_expect(expr, 1)
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# define unlikely(expr) __builtin_expect(expr, 0)
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# define ATOMIC_ADD(var, val) __sync_fetch_and_add(&var, val)
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# define ATOMIC_SUB(var, val) __sync_fetch_and_sub(&var, val)
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#else
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# define likely(expr) (expr)
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# define unlikely(expr) (expr)
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# if defined(sun) || defined (__sun)
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# include <atomic.h>
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# define ATOMIC_ADD(var, val) atomic_add_int(&var, val)
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# define ATOMIC_SUB(var, val) atomic_add_int(&var, -val)
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# else
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// Dunno what to do
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# define ATOMIC_ADD(var, val) var += val
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# define ATOMIC_SUB(var, val) var -= val
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# endif
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#endif
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extern void err_exit(int show_errno, const char *format, ...);
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extern const char *get_execname(const char *);
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extern int parse_numeric(ssize_t *val, const char *str);
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extern ssize_t Read(int fd, void *buf, size_t count);
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extern ssize_t Write(int fd, const void *buf, size_t count);
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/*
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* Roundup v to the nearest power of 2. From Bit Twiddling Hacks:
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* http://graphics.stanford.edu/~seander/bithacks.html
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*/
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static inline unsigned int
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roundup_pow_two(unsigned int v) {
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return (v);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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