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       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                 :      16851 : CRC32::CRC32()
      32                 :      16851 : : nCRC(0)
      33                 :            : {
      34                 :      16851 : }
      35                 :      16851 : CRC32::~CRC32()
      36                 :            : {
      37                 :      16851 : }
      38                 :       1572 : void SAL_CALL CRC32::reset()
      39                 :            :     throw(RuntimeException)
      40                 :            : {
      41                 :       1572 :     nCRC=0;
      42                 :       1572 : }
      43                 :       7997 : sal_Int32 SAL_CALL CRC32::getValue()
      44                 :            :     throw(RuntimeException)
      45                 :            : {
      46                 :       7997 :     return nCRC & 0xFFFFFFFFL;
      47                 :            : }
      48                 :            : /** Update CRC32 with specified sequence of bytes
      49                 :            :  */
      50                 :       1688 : void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b,
      51                 :            :                                     sal_Int32 off,
      52                 :            :                                     sal_Int32 len)
      53                 :            :         throw(RuntimeException)
      54                 :            : {
      55                 :       1688 :     nCRC = rtl_crc32(nCRC, b.getConstArray()+off, len );
      56                 :       1688 : }
      57                 :            : /** Update CRC32 with specified sequence of bytes
      58                 :            :  */
      59                 :       6642 : void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b)
      60                 :            :         throw(RuntimeException)
      61                 :            : {
      62                 :       6642 :     nCRC = rtl_crc32(nCRC, b.getConstArray(),b.getLength());
      63                 :       6642 : }
      64                 :            : 
      65                 :         84 : sal_Int32 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream )
      66                 :            :     throw ( RuntimeException )
      67                 :            : {
      68                 :         84 :     sal_Int32 nLength, nTotal = 0;
      69         [ +  - ]:         84 :     Sequence < sal_Int8 > aSeq ( n_ConstBufferSize );
      70         [ -  + ]:         84 :     do
      71                 :            :     {
      72 [ +  - ][ +  - ]:         84 :         nLength = xStream->readBytes ( aSeq, n_ConstBufferSize );
      73         [ +  - ]:         84 :         updateSegment ( aSeq, 0, nLength );
      74                 :         84 :         nTotal += nLength;
      75                 :            :     }
      76                 :            :     while ( nLength == n_ConstBufferSize );
      77                 :            : 
      78         [ +  - ]:         84 :     return nTotal;
      79                 :            : }
      80                 :            : 
      81                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */