91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org 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
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include <CRC32.hxx>
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#include <PackageConstants.hxx>
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#include <rtl/crc.h>
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#include <com/sun/star/io/XInputStream.hpp>
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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 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 = rtl_crc32(nCRC, 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 = rtl_crc32(nCRC, 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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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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