This repository has been archived on 2024-04-08. You can view files and clone it, but cannot push or open issues or pull requests.
deb-goldedplus/goldlib/gall/gcrcall.h

94 lines
3.6 KiB
C
Raw Normal View History

2000-02-25 10:15:17 +00:00
// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// Copyright (C) 2000 Alexander S. Aganichev
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA 02111-1307, USA
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// CRC-16, CRC-32 and Hashing.
// ------------------------------------------------------------------
#ifndef __gcrcall_h
#define __gcrcall_h
// ------------------------------------------------------------------
#include <gdefs.h>
// ------------------------------------------------------------------
// Declare the CRC tables
extern "C" {
2000-02-25 10:15:17 +00:00
extern word __crc16_table[];
extern dword __crc32_table[];
}
2000-02-25 10:15:17 +00:00
// ------------------------------------------------------------------
// Generate/update a CRC-16 or CRC-32 value
//
// These inline functions were derived from various #define macro
// implementations. Some of those implementations masked the right
// shifts to ensure correct zero fill. But this is C++, where zero
// fill is guaranteed for unsigned operands, and besides we use
// prototyped unsigned parameters anyway, so we have no problem here.
inline word updCrc16(byte ch, word crc) { return (word)(__crc16_table[byte(crc >> 8)] ^ (crc << 8) ^ (ch)); }
2003-12-10 08:35:16 +00:00
inline word updCrc16c(byte ch, word crc) { return (word)(__crc16_table[byte(crc >> 8) ^ (ch)] ^ (crc << 8)); }
2000-02-25 10:15:17 +00:00
inline dword updCrc32(byte ch, dword crc) { return (dword)(__crc32_table[byte(crc) ^ byte(ch)] ^ (crc >> 8)); }
// ------------------------------------------------------------------
// Define CRC masks in the "normal" and "CCITT" variants
const word CRC16_MASK_NORMAL = 0;
const word CRC16_MASK_CCITT = 0xFFFFU;
const dword CRC32_MASK_NORMAL = 0;
const dword CRC32_MASK_CCITT = 0xFFFFFFFFUL;
// ------------------------------------------------------------------
// Prototypes
word strCrc16(const char* s, bool nocase=true, word mask=CRC16_MASK_NORMAL);
2003-12-10 08:35:16 +00:00
word strCrc16c(const char* s, bool nocase=true, word mask=CRC16_MASK_NORMAL);
2000-02-25 10:15:17 +00:00
dword strCrc32(const char* s, bool nocase=true, dword mask=CRC32_MASK_NORMAL);
dword strHash32(const char* s, bool nocase=true);
word memCrc16(const void* m, long l, bool nocase=true, word mask=CRC16_MASK_NORMAL);
dword memCrc32(const void* m, long l, bool nocase=true, dword mask=CRC32_MASK_NORMAL);
// ------------------------------------------------------------------
// Get keyword/value pairs and crc
void getkeyval(char** key, char** val);
void getkeyvaleql(char** key, char** val, bool eql);
word getkeyvalcrc(char** key, char** val);
// ------------------------------------------------------------------
#endif
// ------------------------------------------------------------------