1*cdf0e10cSrcweir /************************************************************************* 2*cdf0e10cSrcweir * 3*cdf0e10cSrcweir * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4*cdf0e10cSrcweir * 5*cdf0e10cSrcweir * Copyright 2000, 2010 Oracle and/or its affiliates. 6*cdf0e10cSrcweir * 7*cdf0e10cSrcweir * OpenOffice.org - a multi-platform office productivity suite 8*cdf0e10cSrcweir * 9*cdf0e10cSrcweir * This file is part of OpenOffice.org. 10*cdf0e10cSrcweir * 11*cdf0e10cSrcweir * OpenOffice.org is free software: you can redistribute it and/or modify 12*cdf0e10cSrcweir * it under the terms of the GNU Lesser General Public License version 3 13*cdf0e10cSrcweir * only, as published by the Free Software Foundation. 14*cdf0e10cSrcweir * 15*cdf0e10cSrcweir * OpenOffice.org is distributed in the hope that it will be useful, 16*cdf0e10cSrcweir * but WITHOUT ANY WARRANTY; without even the implied warranty of 17*cdf0e10cSrcweir * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18*cdf0e10cSrcweir * GNU Lesser General Public License version 3 for more details 19*cdf0e10cSrcweir * (a copy is included in the LICENSE file that accompanied this code). 20*cdf0e10cSrcweir * 21*cdf0e10cSrcweir * You should have received a copy of the GNU Lesser General Public License 22*cdf0e10cSrcweir * version 3 along with OpenOffice.org. If not, see 23*cdf0e10cSrcweir * <http://www.openoffice.org/license.html> 24*cdf0e10cSrcweir * for a copy of the LGPLv3 License. 25*cdf0e10cSrcweir * 26*cdf0e10cSrcweir ************************************************************************/ 27*cdf0e10cSrcweir 28*cdf0e10cSrcweir // MARKER(update_precomp.py): autogen include statement, do not remove 29*cdf0e10cSrcweir #include "precompiled_package.hxx" 30*cdf0e10cSrcweir #include <CRC32.hxx> 31*cdf0e10cSrcweir #ifndef _ZLIB_H 32*cdf0e10cSrcweir #ifdef SYSTEM_ZLIB 33*cdf0e10cSrcweir #include <zlib.h> 34*cdf0e10cSrcweir #else 35*cdf0e10cSrcweir #include <external/zlib/zlib.h> 36*cdf0e10cSrcweir #endif 37*cdf0e10cSrcweir #endif 38*cdf0e10cSrcweir #include <PackageConstants.hxx> 39*cdf0e10cSrcweir #include <com/sun/star/io/XInputStream.hpp> 40*cdf0e10cSrcweir 41*cdf0e10cSrcweir using namespace rtl; 42*cdf0e10cSrcweir using namespace com::sun::star::uno; 43*cdf0e10cSrcweir using namespace com::sun::star::io; 44*cdf0e10cSrcweir 45*cdf0e10cSrcweir /** A class to compute the CRC32 value of a data stream 46*cdf0e10cSrcweir */ 47*cdf0e10cSrcweir 48*cdf0e10cSrcweir CRC32::CRC32() 49*cdf0e10cSrcweir : nCRC(0) 50*cdf0e10cSrcweir { 51*cdf0e10cSrcweir } 52*cdf0e10cSrcweir CRC32::~CRC32() 53*cdf0e10cSrcweir { 54*cdf0e10cSrcweir } 55*cdf0e10cSrcweir void SAL_CALL CRC32::reset() 56*cdf0e10cSrcweir throw(RuntimeException) 57*cdf0e10cSrcweir { 58*cdf0e10cSrcweir nCRC=0; 59*cdf0e10cSrcweir } 60*cdf0e10cSrcweir sal_Int32 SAL_CALL CRC32::getValue() 61*cdf0e10cSrcweir throw(RuntimeException) 62*cdf0e10cSrcweir { 63*cdf0e10cSrcweir return nCRC & 0xFFFFFFFFL; 64*cdf0e10cSrcweir } 65*cdf0e10cSrcweir /** Update CRC32 with specified sequence of bytes 66*cdf0e10cSrcweir */ 67*cdf0e10cSrcweir void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b, 68*cdf0e10cSrcweir sal_Int32 off, 69*cdf0e10cSrcweir sal_Int32 len) 70*cdf0e10cSrcweir throw(RuntimeException) 71*cdf0e10cSrcweir { 72*cdf0e10cSrcweir nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray()+off, len ); 73*cdf0e10cSrcweir } 74*cdf0e10cSrcweir /** Update CRC32 with specified sequence of bytes 75*cdf0e10cSrcweir */ 76*cdf0e10cSrcweir void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b) 77*cdf0e10cSrcweir throw(RuntimeException) 78*cdf0e10cSrcweir { 79*cdf0e10cSrcweir nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray(),b.getLength()); 80*cdf0e10cSrcweir } 81*cdf0e10cSrcweir 82*cdf0e10cSrcweir sal_Int32 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream ) 83*cdf0e10cSrcweir throw ( RuntimeException ) 84*cdf0e10cSrcweir { 85*cdf0e10cSrcweir sal_Int32 nLength, nTotal = 0; 86*cdf0e10cSrcweir Sequence < sal_Int8 > aSeq ( n_ConstBufferSize ); 87*cdf0e10cSrcweir do 88*cdf0e10cSrcweir { 89*cdf0e10cSrcweir nLength = xStream->readBytes ( aSeq, n_ConstBufferSize ); 90*cdf0e10cSrcweir updateSegment ( aSeq, 0, nLength ); 91*cdf0e10cSrcweir nTotal += nLength; 92*cdf0e10cSrcweir } 93*cdf0e10cSrcweir while ( nLength == n_ConstBufferSize ); 94*cdf0e10cSrcweir 95*cdf0e10cSrcweir return nTotal; 96*cdf0e10cSrcweir } 97