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/* ucl_util.c -- utilities for the UCL library
This file is part of the UCL data compression library.
Copyright (C) 1996-2004 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>
http://www.oberhumer.com/opensource/ucl/
*/
#include "ucl_conf.h"
/***********************************************************************
//
************************************************************************/
UCL_PUBLIC(ucl_bool)
ucl_assert(int expr)
{
return (expr) ? 1 : 0;
}
/***********************************************************************
//
************************************************************************/
/* If you use the UCL library in a product, you *must* keep this
* copyright string in the executable of your product.
.*/
static const char __ucl_copyright[] =
"\r\n\n"
"UCL data compression library.\n"
"$Copyright: UCL (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Markus Franz Xaver Johannes Oberhumer\n"
"<markus@oberhumer.com>\n"
"http://www.oberhumer.com $\n\n"
"$Id: UCL version: v" UCL_VERSION_STRING ", " UCL_VERSION_DATE " $\n"
"$Built: " __DATE__ " " __TIME__ " $\n"
"$Info: " ACC_INFO_OS
#if defined(ACC_INFO_OS_POSIX)
"/" ACC_INFO_OS_POSIX
#endif
" " ACC_INFO_ARCH
#if defined(ACC_INFO_ENDIAN)
"/" ACC_INFO_ENDIAN
#endif
" " ACC_INFO_MM
" " ACC_INFO_CC
#if defined(ACC_INFO_CCVER)
" " ACC_INFO_CCVER
#endif
" $\n";
UCL_PUBLIC(const ucl_bytep)
ucl_copyright(void)
{
#if (ACC_OS_DOS16 && ACC_CC_TURBOC)
return (ucl_voidp) __ucl_copyright;
#else
return (const ucl_bytep) __ucl_copyright;
#endif
}
UCL_PUBLIC(ucl_uint32)
ucl_version(void)
{
return UCL_VERSION;
}
UCL_PUBLIC(const char *)
ucl_version_string(void)
{
return UCL_VERSION_STRING;
}
UCL_PUBLIC(const char *)
ucl_version_date(void)
{
return UCL_VERSION_DATE;
}
UCL_PUBLIC(const ucl_charp)
_ucl_version_string(void)
{
return UCL_VERSION_STRING;
}
UCL_PUBLIC(const ucl_charp)
_ucl_version_date(void)
{
return UCL_VERSION_DATE;
}
/***********************************************************************
// adler32 checksum
// adapted from free code by Mark Adler <madler@alumni.caltech.edu>
// see http://www.cdrom.com/pub/infozip/zlib/
************************************************************************/
#define UCL_BASE 65521u /* largest prime smaller than 65536 */
#define UCL_NMAX 5552
/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
#define UCL_DO1(buf,i) {s1 += buf[i]; s2 += s1;}
#define UCL_DO2(buf,i) UCL_DO1(buf,i); UCL_DO1(buf,i+1);
#define UCL_DO4(buf,i) UCL_DO2(buf,i); UCL_DO2(buf,i+2);
#define UCL_DO8(buf,i) UCL_DO4(buf,i); UCL_DO4(buf,i+4);
#define UCL_DO16(buf,i) UCL_DO8(buf,i); UCL_DO8(buf,i+8);
UCL_PUBLIC(ucl_uint32)
ucl_adler32(ucl_uint32 adler, const ucl_bytep buf, ucl_uint len)
{
ucl_uint32 s1 = adler & 0xffff;
ucl_uint32 s2 = (adler >> 16) & 0xffff;
int k;
if (buf == NULL)
return 1;
while (len > 0)
{
k = len < UCL_NMAX ? (int) len : UCL_NMAX;
len -= k;
if (k >= 16) do
{
UCL_DO16(buf,0);
buf += 16;
k -= 16;
} while (k >= 16);
if (k != 0) do
{
s1 += *buf++;
s2 += s1;
} while (--k > 0);
s1 %= UCL_BASE;
s2 %= UCL_BASE;
}
return (s2 << 16) | s1;
}
/*
vi:ts=4:et
*/
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