1 /**************************************************************
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
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7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
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11 * http://www.apache.org/licenses/LICENSE-2.0
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15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
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18 * under the License.
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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
CRC32()44 CRC32::CRC32()
45 : nCRC(0)
46 {
47 }
~CRC32()48 CRC32::~CRC32()
49 {
50 }
reset()51 void SAL_CALL CRC32::reset()
52 throw(RuntimeException)
53 {
54 nCRC=0;
55 }
getValue()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 */
updateSegment(const Sequence<sal_Int8> & b,sal_Int32 off,sal_Int32 len)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 */
update(const Sequence<sal_Int8> & b)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
updateStream(Reference<XInputStream> & xStream)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