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/* ucl_util.h -- utilities for the UCL library
This file is part of the UCL data compression library.
Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The UCL library 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.
The UCL library 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 the UCL library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the library and is subject
to change.
*/
#ifndef __UCL_UTIL_H
#define __UCL_UTIL_H
#ifndef __UCL_CONF_H
# include "ucl_conf.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
// fast memcpy that copies multiples of 8 byte chunks.
// len is the number of bytes.
// note: all parameters must be lvalues, len >= 8
// dest and src advance, len is undefined afterwards
************************************************************************/
#if 1 && defined(HAVE_MEMCPY)
#if !defined(__UCL_DOS16) && !defined(__UCL_WIN16)
#define MEMCPY8_DS(dest,src,len) \
memcpy(dest,src,len); \
dest += len; \
src += len
#endif
#endif
#if 0 && !defined(MEMCPY8_DS)
#define MEMCPY8_DS(dest,src,len) \
{ do { \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
len -= 8; \
} while (len > 0); }
#endif
#if !defined(MEMCPY8_DS)
#define MEMCPY8_DS(dest,src,len) \
{ register ucl_uint __l = (len) / 8; \
do { \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
*dest++ = *src++; \
} while (--__l > 0); }
#endif
/***********************************************************************
// memcpy and pseudo-memmove
// len is the number of bytes.
// note: all parameters must be lvalues, len > 0
// dest and src advance, len is undefined afterwards
************************************************************************/
#define MEMCPY_DS(dest,src,len) \
do *dest++ = *src++; \
while (--len > 0)
#define MEMMOVE_DS(dest,src,len) \
do *dest++ = *src++; \
while (--len > 0)
/***********************************************************************
// fast bzero that clears multiples of 8 pointers
// n is the number of pointers.
// note: n > 0
// s and n are undefined afterwards
************************************************************************/
#if (UCL_UINT_MAX <= SIZE_T_MAX) && defined(HAVE_MEMSET)
#if 1
#define BZERO8_PTR(s,l,n) memset((s),0,(ucl_uint)(l)*(n))
#else
#define BZERO8_PTR(s,l,n) memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
#endif
#else
#define BZERO8_PTR(s,l,n) \
ucl_memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
#endif
/***********************************************************************
// rotate (not used at the moment)
************************************************************************/
#if 0
#if defined(__GNUC__) && defined(__i386__)
unsigned char ucl_rotr8(unsigned char value, int shift);
extern __inline__ unsigned char ucl_rotr8(unsigned char value, int shift)
{
unsigned char result;
__asm__ __volatile__ ("movb %b1, %b0; rorb %b2, %b0"
: "=a"(result) : "g"(value), "c"(shift));
return result;
}
unsigned short ucl_rotr16(unsigned short value, int shift);
extern __inline__ unsigned short ucl_rotr16(unsigned short value, int shift)
{
unsigned short result;
__asm__ __volatile__ ("movw %b1, %b0; rorw %b2, %b0"
: "=a"(result) : "g"(value), "c"(shift));
return result;
}
#endif
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/*
vi:ts=4:et
*/
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