7c21a96e9a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8087 a1c6a512-1295-4272-9138-f99709370657
180 lines
4.5 KiB
C
180 lines
4.5 KiB
C
/* ucl_util.h -- utilities for the UCL library
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This file is part of the UCL data compression library.
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Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The UCL library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The UCL library 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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You should have received a copy of the GNU General Public License
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along with the UCL library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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*/
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/* WARNING: this file should *not* be used by applications. It is
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part of the implementation of the library and is subject
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to change.
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*/
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#ifndef __UCL_UTIL_H
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#define __UCL_UTIL_H
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#ifndef __UCL_CONF_H
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# include "ucl_conf.h"
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***********************************************************************
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// fast memcpy that copies multiples of 8 byte chunks.
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// len is the number of bytes.
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// note: all parameters must be lvalues, len >= 8
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// dest and src advance, len is undefined afterwards
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************************************************************************/
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#if 1 && defined(HAVE_MEMCPY)
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#if !defined(__UCL_DOS16) && !defined(__UCL_WIN16)
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#define MEMCPY8_DS(dest,src,len) \
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memcpy(dest,src,len); \
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dest += len; \
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src += len
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#endif
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#endif
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#if 0 && !defined(MEMCPY8_DS)
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#define MEMCPY8_DS(dest,src,len) \
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{ do { \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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len -= 8; \
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} while (len > 0); }
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#endif
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#if !defined(MEMCPY8_DS)
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#define MEMCPY8_DS(dest,src,len) \
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{ register ucl_uint __l = (len) / 8; \
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do { \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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*dest++ = *src++; \
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} while (--__l > 0); }
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#endif
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/***********************************************************************
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// memcpy and pseudo-memmove
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// len is the number of bytes.
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// note: all parameters must be lvalues, len > 0
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// dest and src advance, len is undefined afterwards
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************************************************************************/
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#define MEMCPY_DS(dest,src,len) \
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do *dest++ = *src++; \
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while (--len > 0)
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#define MEMMOVE_DS(dest,src,len) \
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do *dest++ = *src++; \
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while (--len > 0)
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/***********************************************************************
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// fast bzero that clears multiples of 8 pointers
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// n is the number of pointers.
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// note: n > 0
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// s and n are undefined afterwards
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************************************************************************/
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#if (UCL_UINT_MAX <= SIZE_T_MAX) && defined(HAVE_MEMSET)
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#if 1
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#define BZERO8_PTR(s,l,n) memset((s),0,(ucl_uint)(l)*(n))
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#else
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#define BZERO8_PTR(s,l,n) memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
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#endif
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#else
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#define BZERO8_PTR(s,l,n) \
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ucl_memset((ucl_voidp)(s),0,(ucl_uint)(l)*(n))
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#endif
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/***********************************************************************
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// rotate (not used at the moment)
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************************************************************************/
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#if 0
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#if defined(__GNUC__) && defined(__i386__)
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unsigned char ucl_rotr8(unsigned char value, int shift);
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extern __inline__ unsigned char ucl_rotr8(unsigned char value, int shift)
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{
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unsigned char result;
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__asm__ __volatile__ ("movb %b1, %b0; rorb %b2, %b0"
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: "=a"(result) : "g"(value), "c"(shift));
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return result;
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}
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unsigned short ucl_rotr16(unsigned short value, int shift);
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extern __inline__ unsigned short ucl_rotr16(unsigned short value, int shift)
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{
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unsigned short result;
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__asm__ __volatile__ ("movw %b1, %b0; rorw %b2, %b0"
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: "=a"(result) : "g"(value), "c"(shift));
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return result;
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}
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#endif
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* already included */
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/*
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vi:ts=4:et
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*/
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