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