mirror of https://github.com/libAthena/athena.git
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/* lzo_util.c -- utilities for the LZO library
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO 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 LZO 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 LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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#include "lzo_conf.h"
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/***********************************************************************
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//
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************************************************************************/
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/* If you use the LZO library in a product, I would appreciate that you
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* keep this copyright string in the executable of your product.
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.*/
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static const char lzo_copyright_[] =
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#if !defined(__LZO_IN_MINLZO)
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/* save space as some people want a really small decompressor */
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LZO_VERSION_STRING;
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#else
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"\r\n\n"
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"LZO data compression library.\n"
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"$Copyright: LZO Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer\n"
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"<markus@oberhumer.com>\n"
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"http://www.oberhumer.com $\n\n"
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"$Id: LZO version: v" LZO_VERSION_STRING ", " LZO_VERSION_DATE " $\n"
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"$Info: " LZO_INFO_STRING " $\n";
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#endif
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static const char lzo_version_string_[] = LZO_VERSION_STRING;
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static const char lzo_version_date_[] = LZO_VERSION_DATE;
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LZO_PUBLIC(const lzo_bytep)
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lzo_copyright(void)
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{
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return (const lzo_bytep) lzo_copyright_;
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}
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LZO_PUBLIC(unsigned)
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lzo_version(void)
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{
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return LZO_VERSION;
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}
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LZO_PUBLIC(const char*)
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lzo_version_string(void)
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{
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return lzo_version_string_;
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}
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LZO_PUBLIC(const char*)
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lzo_version_date(void)
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{
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return lzo_version_date_;
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}
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LZO_PUBLIC(const lzo_charp)
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_lzo_version_string(void)
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{
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return lzo_version_string_;
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}
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LZO_PUBLIC(const lzo_charp)
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_lzo_version_date(void)
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{
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return lzo_version_date_;
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}
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/***********************************************************************
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// adler32 checksum
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// adapted from free code by Mark Adler <madler@alumni.caltech.edu>
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// see http://www.zlib.org/
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************************************************************************/
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#define LZO_BASE 65521u /* largest prime smaller than 65536 */
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#define LZO_NMAX 5552
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/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
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#define LZO_DO1(buf,i) s1 += buf[i]; s2 += s1
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#define LZO_DO2(buf,i) LZO_DO1(buf,i); LZO_DO1(buf,i+1)
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#define LZO_DO4(buf,i) LZO_DO2(buf,i); LZO_DO2(buf,i+2)
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#define LZO_DO8(buf,i) LZO_DO4(buf,i); LZO_DO4(buf,i+4)
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#define LZO_DO16(buf,i) LZO_DO8(buf,i); LZO_DO8(buf,i+8)
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LZO_PUBLIC(lzo_uint32_t)
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lzo_adler32(lzo_uint32_t adler, const lzo_bytep buf, lzo_uint len)
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{
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lzo_uint32_t s1 = adler & 0xffff;
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lzo_uint32_t s2 = (adler >> 16) & 0xffff;
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unsigned k;
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if (buf == NULL)
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return 1;
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while (len > 0)
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{
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k = len < LZO_NMAX ? (unsigned) len : LZO_NMAX;
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len -= k;
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if (k >= 16) do
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{
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LZO_DO16(buf, 0);
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buf += 16;
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k -= 16;
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}
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while (k >= 16);
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if (k != 0) do
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{
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s1 += *buf++;
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s2 += s1;
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}
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while (--k > 0);
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s1 %= LZO_BASE;
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s2 %= LZO_BASE;
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}
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return (s2 << 16) | s1;
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}
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#undef LZO_DO1
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#undef LZO_DO2
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#undef LZO_DO4
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#undef LZO_DO8
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#undef LZO_DO16
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/* vim:set ts=4 sw=4 et: */
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