1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 // MARKER(update_precomp.py): autogen include statement, do not remove 25 #include "precompiled_package.hxx" 26 #include <CRC32.hxx> 27 #ifndef _ZLIB_H 28 #ifdef SYSTEM_ZLIB 29 #include <zlib.h> 30 #else 31 #include <external/zlib/zlib.h> 32 #endif 33 #endif 34 #include <PackageConstants.hxx> 35 #include <com/sun/star/io/XInputStream.hpp> 36 37 using namespace rtl; 38 using namespace com::sun::star::uno; 39 using namespace com::sun::star::io; 40 41 /** A class to compute the CRC32 value of a data stream 42 */ 43 44 CRC32::CRC32() 45 : nCRC(0) 46 { 47 } 48 CRC32::~CRC32() 49 { 50 } 51 void SAL_CALL CRC32::reset() 52 throw(RuntimeException) 53 { 54 nCRC=0; 55 } 56 sal_Int32 SAL_CALL CRC32::getValue() 57 throw(RuntimeException) 58 { 59 return nCRC & 0xFFFFFFFFL; 60 } 61 /** Update CRC32 with specified sequence of bytes 62 */ 63 void SAL_CALL CRC32::updateSegment(const Sequence< sal_Int8 > &b, 64 sal_Int32 off, 65 sal_Int32 len) 66 throw(RuntimeException) 67 { 68 nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray()+off, len ); 69 } 70 /** Update CRC32 with specified sequence of bytes 71 */ 72 void SAL_CALL CRC32::update(const Sequence< sal_Int8 > &b) 73 throw(RuntimeException) 74 { 75 nCRC = crc32(nCRC, (const unsigned char*)b.getConstArray(),b.getLength()); 76 } 77 78 sal_Int32 SAL_CALL CRC32::updateStream( Reference < XInputStream > & xStream ) 79 throw ( RuntimeException ) 80 { 81 sal_Int32 nLength, nTotal = 0; 82 Sequence < sal_Int8 > aSeq ( n_ConstBufferSize ); 83 do 84 { 85 nLength = xStream->readBytes ( aSeq, n_ConstBufferSize ); 86 updateSegment ( aSeq, 0, nLength ); 87 nTotal += nLength; 88 } 89 while ( nLength == n_ConstBufferSize ); 90 91 return nTotal; 92 } 93