95 lines
3.7 KiB
C++
95 lines
3.7 KiB
C++
// This may look like C code, but it is really -*- C++ -*-
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// ------------------------------------------------------------------
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// The Goldware Library
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// Copyright (C) 1990-1999 Odinn Sorensen
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// Copyright (C) 2000 Alexander S. Aganichev
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// ------------------------------------------------------------------
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this program; if not, write to the Free
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// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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// MA 02111-1307, USA
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// ------------------------------------------------------------------
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// $Id$
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// ------------------------------------------------------------------
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// CRC-16, CRC-32 and Hashing.
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// ------------------------------------------------------------------
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#ifndef __gcrcall_h
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#define __gcrcall_h
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// ------------------------------------------------------------------
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#include <gdefs.h>
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// ------------------------------------------------------------------
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// Declare the CRC tables
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extern word __crc16_table[];
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extern dword __crc32_table[];
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// ------------------------------------------------------------------
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// Generate/update a CRC-16 or CRC-32 value
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//
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// These inline functions were derived from various #define macro
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// implementations. Some of those implementations masked the right
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// shifts to ensure correct zero fill. But this is C++, where zero
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// fill is guaranteed for unsigned operands, and besides we use
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// prototyped unsigned parameters anyway, so we have no problem here.
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inline word updCrc16(byte ch, word crc) { return (word)(__crc16_table[crc >> 8] ^ ((crc << 8) & 0xFFFF) ^ ch); }
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inline word updCrc16c(byte ch, word crc) { return (word)(__crc16_table[(crc >> 8) ^ ch] ^ ((crc << 8) & 0xFFFF)); }
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inline dword updCrc32(byte ch, dword crc) { return (dword)(__crc32_table[(crc & 0xFF) ^ ch] ^ (crc >> 8)); }
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// ------------------------------------------------------------------
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// Define CRC masks in the "normal" and "CCITT" variants
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const word CRC16_MASK_NORMAL = 0;
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const word CRC16_MASK_CCITT = 0xFFFFU;
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const dword CRC32_MASK_NORMAL = 0;
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const dword CRC32_MASK_CCITT = 0xFFFFFFFFUL;
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// ------------------------------------------------------------------
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// Prototypes
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word strCrc16(const char* s, bool nocase=true, word mask=CRC16_MASK_NORMAL);
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word strCrc16c(const char* s, bool nocase=true, word mask=CRC16_MASK_NORMAL);
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dword strCrc32(const char* s, bool nocase=true, dword mask=CRC32_MASK_NORMAL);
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dword strHash32(const char* s, bool nocase=true);
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word memCrc16(const void* m, long l, bool nocase=true, word mask=CRC16_MASK_NORMAL);
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dword memCrc32(const void* m, long l, bool nocase=true, dword mask=CRC32_MASK_NORMAL);
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inline dword memCrc32(dword crc, const void* m, long l, bool nocase=true, dword mask=CRC32_MASK_NORMAL)
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{
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return memCrc32(m, l, nocase, crc ^ mask) ^ mask;
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}
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// ------------------------------------------------------------------
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// Get keyword/value pairs and crc
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void getkeyval(char** key, char** val);
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void getkeyvaleql(char** key, char** val, bool eql);
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word getkeyvalcrc(char** key, char** val);
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// ------------------------------------------------------------------
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#endif
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// ------------------------------------------------------------------
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