Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <CRC32.hxx>
      21             : #include <PackageConstants.hxx>
      22             : #include <rtl/crc.h>
      23             : #include <com/sun/star/io/XInputStream.hpp>
      24             : 
      25             : using namespace com::sun::star::uno;
      26             : using namespace com::sun::star::io;
      27             : 
      28             : /** A class to compute the CRC32 value of a data stream
      29             :  */
      30             : 
      31      149471 : CRC32::CRC32()
      32      149471 : : nCRC(0)
      33             : {
      34      149471 : }
      35      149471 : CRC32::~CRC32()
      36             : {
      37      149471 : }
      38       17544 : void SAL_CALL CRC32::reset()
      39             :     throw(RuntimeException)
      40             : {
      41       17544 :     nCRC=0;
      42       17544 : }
      43       94820 : sal_Int32 SAL_CALL CRC32::getValue()
      44             :     throw(RuntimeException)
      45             : {
      46       94820 :     return nCRC & 0xFFFFFFFFL;
      47             : }
      48             : /** Update CRC32 with specified sequence of bytes
      49             :  */
      50       18444 : void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b,
      51             :                                    sal_Int32 off, sal_Int32 len)
      52             :         throw(RuntimeException)
      53             : {
      54       18444 :     nCRC = rtl_crc32(nCRC, b.getConstArray()+off, len );
      55       18444 : }
      56             : /** Update CRC32 with specified sequence of bytes
      57             :  */
      58       87688 : void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b)
      59             :         throw(RuntimeException)
      60             : {
      61       87688 :     nCRC = rtl_crc32(nCRC, b.getConstArray(),b.getLength());
      62       87688 : }
      63             : 
      64         106 : sal_Int64 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream )
      65             :     throw ( RuntimeException )
      66             : {
      67             :     sal_Int32 nLength;
      68         106 :     sal_Int64 nTotal = 0;
      69         106 :     Sequence < sal_Int8 > aSeq ( n_ConstBufferSize );
      70         120 :     do
      71             :     {
      72         120 :         nLength = xStream->readBytes ( aSeq, n_ConstBufferSize );
      73         120 :         updateSegment ( aSeq, 0, nLength );
      74         120 :         nTotal += nLength;
      75             :     }
      76             :     while ( nLength == n_ConstBufferSize );
      77             : 
      78         106 :     return nTotal;
      79             : }
      80             : 
      81             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */