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bitmanip.h
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bitmanip.h
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/*
* $Id$
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* For alternative licensing terms, contact licensing@tri-dsystems.com.
*
* Copyright 2005-2008 TRI-D Systems, Inc.
*/
#ifndef BITMANIP_H
#define BITMANIP_H
#include "ident.h"
RCSIDH(bitmanip_h, "$Id$")
#include <inttypes.h>
#if defined(__linux__)
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define _LITTLE_ENDIAN
#else
#define _BIG_ENDIAN
#endif /* else __BYTE_ORDER != __LITTLE_ENDIAN */
#elif defined(__sun__)
#include <sys/byteorder.h>
#endif /* else __sun__ */
/* & is much faster than % */
#define MOD8(n) ((n) & 0x07)
#define MOD4(n) ((n) & 0x03)
#define ROUND4(n) ((n) & ~0x03)
#if defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__)
static inline uint32_t
rol(uint32_t word, uint32_t n)
{
asm("roll %%cl, %0"
:"=r" (word)
:"0" (word), "c" (n));
return word;
}
#elif defined(__sparc__)
#define rol(w,x) (((w) << (x))|((w) >> (32 - (x))))
#elif defined(__ppc__)
#define rol(w,x) (((w) << (x))|((w) >> (32 - (x))))
#endif /* else __ppc__ */
#else
#define rol(w,x) (((w) << (x))|((w) >> (32 - (x))))
#endif /* else !__GNUC__ */
/* avoid strict aliasing */
typedef uint32_t
#if defined(__GNUC__)
__attribute__ ((may_alias))
#endif
uint32_t_a;
/*
* little-endian to host-endian byte manip macros
* (uint32 alignment assumed)
*
* LEUCHAR2HEUINT32: little-endian uchar to host-endian uint32
* LEUCHAR2HEUINT32ZE: little-endian uchar to host-endian uint32 w/ extension
* HEUINT32TOLEUCHAR: host-endian uint32 to little-endian uchar
* HEUINT32P2LEUCHAR: host-endian uint32 (partial) to little-endian uchar
* LEUCHARXORHEUINT32: xor of little-endian uchar with host-endian uint32
* LEUCHARXORHEUINT32P: xor of le uchar with host-endian uint32 (partial)
*/
#ifdef _LITTLE_ENDIAN
#define LEUCHAR2HEUINT32(w, cp) w = *(uint32_t_a *) cp
#define LEUCHAR2HEUINT32ZE(w, cp, n) do \
{ \
unsigned char *uccp = (unsigned char *) cp; \
unsigned char *ucwp = (unsigned char *) &w; \
unsigned li; \
w = 0; \
for (li = 0; li < n; ++li) \
ucwp[li] = uccp[li]; \
} while (0)
#define HEUINT32TOLEUCHAR(cp, w) *(uint32_t_a *) cp = w;
#define HEUINT32P2LEUCHAR(cp, w, n) do \
{ \
unsigned char *uccp = (unsigned char *) cp; \
unsigned char *ucwp = (unsigned char *) &w; \
unsigned li; \
for (li = 0; li < n; ++li) \
uccp[li] = ucwp[li]; \
} while (0);
#define LEUCHARXORHEUINT32(wp, xp, y) do \
{ \
uint32_t *uiwp = (uint32_t *) wp; \
uint32_t *uixp = (uint32_t *) xp; \
*uiwp = *uixp ^ y; \
} while (0)
#define LEUCHARXORHEUINT32P(wp, xp, y, n) do \
{ \
unsigned li; \
unsigned char *ucwp = (unsigned char *) wp; \
unsigned char *ucxp = (unsigned char *) xp; \
unsigned char *ucyp = (unsigned char *) &y; \
for (li = 0; li < n; ++li) \
ucwp[li] = ucxp[li] ^ ucyp[li]; \
} while (0)
#else
#define LEUCHAR2HEUINT32(w, cp) do \
{ \
unsigned char *ucwp = (unsigned char *) &w; \
unsigned char *uccp = (unsigned char *) cp; \
ucwp[0] = uccp[3]; \
ucwp[1] = uccp[2]; \
ucwp[2] = uccp[1]; \
ucwp[3] = uccp[0]; \
} while (0)
#define LEUCHAR2HEUINT32ZE(w, cp, n) do \
{ \
unsigned char *uccp = (unsigned char *) cp; \
unsigned char *ucwp = (unsigned char *) &w; \
unsigned li; \
w = 0; \
for (li = 0; li < n; ++li) \
ucwp[3 -li] = uccp[li]; \
} while (0)
#define HEUINT32TOLEUCHAR(cp, w) do \
{ \
unsigned char *uccp = (unsigned char *) cp; \
unsigned char *ucwp = (unsigned char *) &w; \
uccp[0] = ucwp[3]; \
uccp[1] = ucwp[2]; \
uccp[2] = ucwp[1]; \
uccp[3] = ucwp[0]; \
} while (0)
#define HEUINT32P2LEUCHAR(cp, w, n) do \
{ \
unsigned char *uccp = (unsigned char *) cp; \
unsigned char *ucwp = (unsigned char *) &w; \
unsigned li; \
for (li = 0; li < n; ++li) \
uccp[li] = ucwp[3 - li]; \
} while (0);
#define LEUCHARXORHEUINT32(wp, xp, y) do \
{ \
unsigned char *ucwp = (unsigned char *) wp; \
unsigned char *ucxp = (unsigned char *) xp; \
unsigned char *ucyp = (unsigned char *) &y; \
ucwp[0] = ucxp[0] ^ ucyp[3]; \
ucwp[1] = ucxp[1] ^ ucyp[2]; \
ucwp[2] = ucxp[2] ^ ucyp[1]; \
ucwp[3] = ucxp[3] ^ ucyp[0]; \
} while (0)
#define LEUCHARXORHEUINT32P(wp, xp, y, n) do \
{ \
unsigned li; \
unsigned char *ucwp = (unsigned char *) wp; \
unsigned char *ucxp = (unsigned char *) xp; \
unsigned char *ucyp = (unsigned char *) &y; \
for (li = 0; li < n; ++li) \
ucwp[li] = ucxp[li] ^ ucyp[3 - li]; \
} while (0)
#endif /* !_LITTLE_ENDIAN */
#endif /* BITMANIP_H */