81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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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, sal_Int32 len)
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throw(RuntimeException)
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{
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nCRC = rtl_crc32(nCRC, b.getConstArray(), 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_Int64 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream )
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throw ( RuntimeException )
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{
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sal_Int32 nLength;
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sal_Int64 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, 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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