/* lzo_util.c -- utilities for the LZO library This file is part of the LZO real-time data compression library. Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer All Rights Reserved. The LZO 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 LZO 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 LZO 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 */ #include "lzo_conf.h" #include "lzo_util.h" /*********************************************************************** // ************************************************************************/ LZO_PUBLIC(lzo_bool) lzo_assert(int expr) { return (expr) ? 1 : 0; } /*********************************************************************** // ************************************************************************/ /* If you use the LZO library in a product, you *must* keep this * copyright string in the executable of your product. .*/ const lzo_byte __lzo_copyright[] = #if !defined(__LZO_IN_MINLZO) /* save space as some people want a really small decompressor */ LZO_VERSION_STRING; #else "\n\n\n" "LZO real-time data compression library.\n" "Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 Markus Franz Xaver Johannes Oberhumer\n" "\n" "http://www.oberhumer.com/opensource/lzo/\n" "\n" "LZO version: v" LZO_VERSION_STRING ", " LZO_VERSION_DATE "\n" "LZO build date: " __DATE__ " " __TIME__ "\n\n" "LZO special compilation options:\n" #ifdef __cplusplus " __cplusplus\n" #endif #if defined(__PIC__) " __PIC__\n" #elif defined(__pic__) " __pic__\n" #endif #if (UINT_MAX < LZO_0xffffffffL) " 16BIT\n" #endif #if defined(__LZO_STRICT_16BIT) " __LZO_STRICT_16BIT\n" #endif #if (UINT_MAX > LZO_0xffffffffL) " UINT_MAX=" _LZO_MEXPAND(UINT_MAX) "\n" #endif #if (ULONG_MAX > LZO_0xffffffffL) " ULONG_MAX=" _LZO_MEXPAND(ULONG_MAX) "\n" #endif #if defined(LZO_BYTE_ORDER) " LZO_BYTE_ORDER=" _LZO_MEXPAND(LZO_BYTE_ORDER) "\n" #endif #if defined(LZO_UNALIGNED_OK_2) " LZO_UNALIGNED_OK_2\n" #endif #if defined(LZO_UNALIGNED_OK_4) " LZO_UNALIGNED_OK_4\n" #endif #if defined(LZO_ALIGNED_OK_4) " LZO_ALIGNED_OK_4\n" #endif #if defined(LZO_DICT_USE_PTR) " LZO_DICT_USE_PTR\n" #endif #if defined(__LZO_QUERY_COMPRESS) " __LZO_QUERY_COMPRESS\n" #endif #if defined(__LZO_QUERY_DECOMPRESS) " __LZO_QUERY_DECOMPRESS\n" #endif #if defined(__LZO_IN_MINILZO) " __LZO_IN_MINILZO\n" #endif "\n\n" /* RCS information */ "$Id: LZO " LZO_VERSION_STRING " built " __DATE__ " " __TIME__ #if defined(__GNUC__) && defined(__VERSION__) " by gcc " __VERSION__ #elif defined(__BORLANDC__) " by Borland C " _LZO_MEXPAND(__BORLANDC__) #elif defined(_MSC_VER) " by Microsoft C " _LZO_MEXPAND(_MSC_VER) #elif defined(__PUREC__) " by Pure C " _LZO_MEXPAND(__PUREC__) #elif defined(__SC__) " by Symantec C " _LZO_MEXPAND(__SC__) #elif defined(__TURBOC__) " by Turbo C " _LZO_MEXPAND(__TURBOC__) #elif defined(__WATCOMC__) " by Watcom C " _LZO_MEXPAND(__WATCOMC__) #endif " $\n" "$Copyright: LZO (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002 Markus Franz Xaver Johannes Oberhumer $\n"; #endif LZO_PUBLIC(const lzo_byte *) lzo_copyright(void) { return __lzo_copyright; } LZO_PUBLIC(unsigned) lzo_version(void) { return LZO_VERSION; } LZO_PUBLIC(const char *) lzo_version_string(void) { return LZO_VERSION_STRING; } LZO_PUBLIC(const char *) lzo_version_date(void) { return LZO_VERSION_DATE; } LZO_PUBLIC(const lzo_charp) _lzo_version_string(void) { return LZO_VERSION_STRING; } LZO_PUBLIC(const lzo_charp) _lzo_version_date(void) { return LZO_VERSION_DATE; } /*********************************************************************** // adler32 checksum // adapted from free code by Mark Adler // see http://www.cdrom.com/pub/infozip/zlib/ ************************************************************************/ #define LZO_BASE 65521u /* largest prime smaller than 65536 */ #define LZO_NMAX 5552 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ #define LZO_DO1(buf,i) {s1 += buf[i]; s2 += s1;} #define LZO_DO2(buf,i) LZO_DO1(buf,i); LZO_DO1(buf,i+1); #define LZO_DO4(buf,i) LZO_DO2(buf,i); LZO_DO2(buf,i+2); #define LZO_DO8(buf,i) LZO_DO4(buf,i); LZO_DO4(buf,i+4); #define LZO_DO16(buf,i) LZO_DO8(buf,i); LZO_DO8(buf,i+8); LZO_PUBLIC(lzo_uint32) lzo_adler32(lzo_uint32 adler, const lzo_byte *buf, lzo_uint len) { lzo_uint32 s1 = adler & 0xffff; lzo_uint32 s2 = (adler >> 16) & 0xffff; int k; if (buf == NULL) return 1; while (len > 0) { k = len < LZO_NMAX ? (int) len : LZO_NMAX; len -= k; if (k >= 16) do { LZO_DO16(buf,0); buf += 16; k -= 16; } while (k >= 16); if (k != 0) do { s1 += *buf++; s2 += s1; } while (--k > 0); s1 %= LZO_BASE; s2 %= LZO_BASE; } return (s2 << 16) | s1; } /* vi:ts=4:et */ //martysama0134's 2e58d0b8baeb072acdf3afc4a5d1999f