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| Rev | Author | Line No. | Line |
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| 26 | pmbaty | 1 | /* ucl_util.c -- utilities for the UCL library |
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| 3 | This file is part of the UCL data compression library. |
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| 4 | |||
| 5 | Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer |
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| 6 | All Rights Reserved. |
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| 7 | |||
| 8 | The UCL library is free software; you can redistribute it and/or |
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| 9 | modify it under the terms of the GNU General Public License as |
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| 10 | published by the Free Software Foundation; either version 2 of |
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| 11 | the License, or (at your option) any later version. |
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| 12 | |||
| 13 | The UCL library is distributed in the hope that it will be useful, |
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | GNU General Public License for more details. |
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| 17 | |||
| 18 | You should have received a copy of the GNU General Public License |
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| 19 | along with the UCL library; see the file COPYING. |
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| 20 | If not, write to the Free Software Foundation, Inc., |
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| 21 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 22 | |||
| 23 | Markus F.X.J. Oberhumer |
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| 24 | <markus@oberhumer.com> |
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| 25 | http://www.oberhumer.com/opensource/ucl/ |
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| 26 | */ |
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| 27 | |||
| 28 | |||
| 29 | #include "ucl_conf.h" |
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| 30 | |||
| 31 | |||
| 32 | /*********************************************************************** |
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| 33 | // |
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| 34 | ************************************************************************/ |
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| 35 | |||
| 36 | UCL_PUBLIC(ucl_bool) |
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| 37 | ucl_assert(int expr) |
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| 38 | { |
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| 39 | return (expr) ? 1 : 0; |
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| 40 | } |
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| 41 | |||
| 42 | |||
| 43 | /*********************************************************************** |
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| 44 | // |
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| 45 | ************************************************************************/ |
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| 46 | |||
| 47 | /* If you use the UCL library in a product, you *must* keep this |
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| 48 | * copyright string in the executable of your product. |
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| 49 | .*/ |
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| 50 | |||
| 51 | static const char __ucl_copyright[] = |
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| 52 | "\r\n\n" |
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| 53 | "UCL data compression library.\n" |
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| 54 | "$Copyright: UCL (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Markus Franz Xaver Johannes Oberhumer\n" |
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| 55 | "<markus@oberhumer.com>\n" |
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| 56 | "http://www.oberhumer.com $\n\n" |
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| 57 | "$Id: UCL version: v" UCL_VERSION_STRING ", " UCL_VERSION_DATE " $\n" |
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| 58 | "$Built: " __DATE__ " " __TIME__ " $\n" |
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| 59 | "$Info: " ACC_INFO_OS |
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| 60 | #if defined(ACC_INFO_OS_POSIX) |
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| 61 | "/" ACC_INFO_OS_POSIX |
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| 62 | #endif |
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| 63 | " " ACC_INFO_ARCH |
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| 64 | #if defined(ACC_INFO_ENDIAN) |
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| 65 | "/" ACC_INFO_ENDIAN |
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| 66 | #endif |
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| 67 | " " ACC_INFO_MM |
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| 68 | " " ACC_INFO_CC |
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| 69 | #if defined(ACC_INFO_CCVER) |
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| 70 | " " ACC_INFO_CCVER |
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| 71 | #endif |
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| 72 | " $\n"; |
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| 73 | |||
| 74 | UCL_PUBLIC(const ucl_bytep) |
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| 75 | ucl_copyright(void) |
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| 76 | { |
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| 77 | #if (ACC_OS_DOS16 && ACC_CC_TURBOC) |
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| 78 | return (ucl_voidp) __ucl_copyright; |
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| 79 | #else |
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| 80 | return (const ucl_bytep) __ucl_copyright; |
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| 81 | #endif |
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| 82 | } |
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| 83 | |||
| 84 | UCL_PUBLIC(ucl_uint32) |
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| 85 | ucl_version(void) |
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| 86 | { |
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| 87 | return UCL_VERSION; |
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| 88 | } |
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| 89 | |||
| 90 | UCL_PUBLIC(const char *) |
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| 91 | ucl_version_string(void) |
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| 92 | { |
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| 93 | return UCL_VERSION_STRING; |
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| 94 | } |
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| 95 | |||
| 96 | UCL_PUBLIC(const char *) |
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| 97 | ucl_version_date(void) |
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| 98 | { |
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| 99 | return UCL_VERSION_DATE; |
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| 100 | } |
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| 101 | |||
| 102 | UCL_PUBLIC(const ucl_charp) |
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| 103 | _ucl_version_string(void) |
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| 104 | { |
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| 105 | return UCL_VERSION_STRING; |
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| 106 | } |
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| 107 | |||
| 108 | UCL_PUBLIC(const ucl_charp) |
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| 109 | _ucl_version_date(void) |
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| 110 | { |
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| 111 | return UCL_VERSION_DATE; |
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| 112 | } |
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| 113 | |||
| 114 | |||
| 115 | /*********************************************************************** |
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| 116 | // adler32 checksum |
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| 117 | // adapted from free code by Mark Adler <madler@alumni.caltech.edu> |
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| 118 | // see http://www.cdrom.com/pub/infozip/zlib/ |
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| 119 | ************************************************************************/ |
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| 120 | |||
| 121 | #define UCL_BASE 65521u /* largest prime smaller than 65536 */ |
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| 122 | #define UCL_NMAX 5552 |
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| 123 | /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */ |
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| 124 | |||
| 125 | #define UCL_DO1(buf,i) {s1 += buf[i]; s2 += s1;} |
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| 126 | #define UCL_DO2(buf,i) UCL_DO1(buf,i); UCL_DO1(buf,i+1); |
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| 127 | #define UCL_DO4(buf,i) UCL_DO2(buf,i); UCL_DO2(buf,i+2); |
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| 128 | #define UCL_DO8(buf,i) UCL_DO4(buf,i); UCL_DO4(buf,i+4); |
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| 129 | #define UCL_DO16(buf,i) UCL_DO8(buf,i); UCL_DO8(buf,i+8); |
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| 130 | |||
| 131 | UCL_PUBLIC(ucl_uint32) |
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| 132 | ucl_adler32(ucl_uint32 adler, const ucl_bytep buf, ucl_uint len) |
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| 133 | { |
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| 134 | ucl_uint32 s1 = adler & 0xffff; |
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| 135 | ucl_uint32 s2 = (adler >> 16) & 0xffff; |
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| 136 | int k; |
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| 137 | |||
| 138 | if (buf == NULL) |
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| 139 | return 1; |
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| 140 | |||
| 141 | while (len > 0) |
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| 142 | { |
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| 143 | k = len < UCL_NMAX ? (int) len : UCL_NMAX; |
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| 144 | len -= k; |
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| 145 | if (k >= 16) do |
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| 146 | { |
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| 147 | UCL_DO16(buf,0); |
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| 148 | buf += 16; |
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| 149 | k -= 16; |
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| 150 | } while (k >= 16); |
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| 151 | if (k != 0) do |
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| 152 | { |
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| 153 | s1 += *buf++; |
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| 154 | s2 += s1; |
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| 155 | } while (--k > 0); |
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| 156 | s1 %= UCL_BASE; |
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| 157 | s2 %= UCL_BASE; |
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| 158 | } |
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| 159 | return (s2 << 16) | s1; |
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| 160 | } |
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| 161 | |||
| 162 | |||
| 163 | /* |
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| 164 | vi:ts=4:et |
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| 165 | */ |