1 /************************************************************************* 2 * 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * Copyright 2000, 2010 Oracle and/or its affiliates. 6 * 7 * OpenOffice.org - a multi-platform office productivity suite 8 * 9 * This file is part of OpenOffice.org. 10 * 11 * OpenOffice.org is free software: you can redistribute it and/or modify 12 * it under the terms of the GNU Lesser General Public License version 3 13 * only, as published by the Free Software Foundation. 14 * 15 * OpenOffice.org is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU Lesser General Public License version 3 for more details 19 * (a copy is included in the LICENSE file that accompanied this code). 20 * 21 * You should have received a copy of the GNU Lesser General Public License 22 * version 3 along with OpenOffice.org. If not, see 23 * <http://www.openoffice.org/license.html> 24 * for a copy of the LGPLv3 License. 25 * 26 ************************************************************************/ 27 28 // MARKER(update_precomp.py): autogen include statement, do not remove 29 #include "precompiled_package.hxx" 30 #include <CRC32.hxx> 31 #ifndef _ZLIB_H 32 #ifdef SYSTEM_ZLIB 33 #include <zlib.h> 34 #else 35 #include <external/zlib/zlib.h> 36 #endif 37 #endif 38 #include <PackageConstants.hxx> 39 #include <com/sun/star/io/XInputStream.hpp> 40 41 using namespace rtl; 42 using namespace com::sun::star::uno; 43 using namespace com::sun::star::io; 44 45 /** A class to compute the CRC32 value of a data stream 46 */ 47 48 CRC32::CRC32() 49 : nCRC(0) 50 { 51 } 52 CRC32::~CRC32() 53 { 54 } 55 void SAL_CALL CRC32::reset() 56 throw(RuntimeException) 57 { 58 nCRC=0; 59 } 60 sal_Int32 SAL_CALL CRC32::getValue() 61 throw(RuntimeException) 62 { 63 return nCRC & 0xFFFFFFFFL; 64 } 65 /** Update CRC32 with specified sequence of bytes 66 */ 67 void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b, 68 sal_Int32 off, 69 sal_Int32 len) 70 throw(RuntimeException) 71 { 72 nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray()+off, len ); 73 } 74 /** Update CRC32 with specified sequence of bytes 75 */ 76 void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b) 77 throw(RuntimeException) 78 { 79 nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray(),b.getLength()); 80 } 81 82 sal_Int32 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream ) 83 throw ( RuntimeException ) 84 { 85 sal_Int32 nLength, nTotal = 0; 86 Sequence < sal_Int8 > aSeq ( n_ConstBufferSize ); 87 do 88 { 89 nLength = xStream->readBytes ( aSeq, n_ConstBufferSize ); 90 updateSegment ( aSeq, 0, nLength ); 91 nTotal += nLength; 92 } 93 while ( nLength == n_ConstBufferSize ); 94 95 return nTotal; 96 } 97