116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/*************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: CRC32.cxx,v $
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*
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* $Revision: 1.11 $
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*
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* last change: $Author: rt $ $Date: 2005-09-08 16:11:18 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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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 Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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#ifndef _CRC32_HXX
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#include <CRC32.hxx>
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#endif
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#ifndef _ZLIB_H
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#ifdef SYSTEM_ZLIB
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#include <zlib.h>
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#else
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#include <external/zlib/zlib.h>
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#endif
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#endif
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#ifndef _PACKAGE_CONSTANTS_HXX_
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#include <PackageConstants.hxx>
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#endif
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#ifndef _COM_SUN_STAR_IO_XINPUTSTREAM_HPP_
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#include <com/sun/star/io/XInputStream.hpp>
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#endif
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using namespace rtl;
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using namespace com::sun::star::uno;
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using namespace com::sun::star::io;
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/** A class to compute the CRC32 value of a data stream
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*/
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CRC32::CRC32()
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: nCRC(0)
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{
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}
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CRC32::~CRC32()
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{
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}
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void SAL_CALL CRC32::reset()
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throw(RuntimeException)
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{
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nCRC=0;
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}
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sal_Int32 SAL_CALL CRC32::getValue()
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throw(RuntimeException)
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{
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return nCRC & 0xFFFFFFFFL;
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}
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/** Update CRC32 with specified byte
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*/
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void SAL_CALL CRC32::updateByte (sal_Int8 nByte)
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throw(RuntimeException)
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{
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sal_uInt8 pBuf[1];
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pBuf[0] = (sal_uInt8)nByte;
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nCRC = crc32(nCRC, pBuf, 1);
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}
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/** Update CRC32 with specified sequence of bytes
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*/
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void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b,
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sal_Int32 off,
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sal_Int32 len)
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throw(RuntimeException)
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{
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nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray()+off, len );
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}
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/** Update CRC32 with specified sequence of bytes
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*/
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void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b)
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throw(RuntimeException)
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{
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nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray(),b.getLength());
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}
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sal_Int32 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream )
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throw ( RuntimeException )
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{
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sal_Int32 nLength, nTotal = 0;
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Sequence < sal_Int8 > aSeq ( n_ConstBufferSize );
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do
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{
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nLength = xStream->readBytes ( aSeq, n_ConstBufferSize );
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updateSegment ( aSeq, 0, nLength );
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nTotal += nLength;
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}
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while ( nLength == n_ConstBufferSize );
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return nTotal;
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}
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