/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 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)); }