/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /*! * @header CRCCalc */ #include "CRCCalc.h" // -------------------------------------------------------------------------------- // * CRCCalc () // -------------------------------------------------------------------------------- CRCCalc::CRCCalc ( void ) { } // CRCCalc // -------------------------------------------------------------------------------- // * ~CRCCalc () // -------------------------------------------------------------------------------- CRCCalc::~CRCCalc ( void ) { } // ~CRCCalc // -------------------------------------------------------------------------------- // * UPDC16 () // -------------------------------------------------------------------------------- unsigned short CRCCalc::UPDC16 ( Byte *ptr, unsigned long count, unsigned short crc ) { while (count-- > 0) { crc = CRCTable[((crc >> 8) ^ *ptr++) & 0xFF] ^ (crc << 8); } return( crc ); } // -------------------------------------------------------------------------------- // * updcrc () // -------------------------------------------------------------------------------- unsigned short CRCCalc::updcrc ( register Byte b, register unsigned short crc ) { return CRCTable[((crc >> 8) ^ b) & 0xFF] ^ (crc << 8); } // -------------------------------------------------------------------------------- // * UPDC32 () // -------------------------------------------------------------------------------- unsigned long CRCCalc::UPDC32 ( register Byte b, register unsigned long c ) { return (cr3tab[((int)c ^ b) & 0xff] ^ ((c >> 8) & 0x00FFFFFF)); }