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 #include "oox/helper/binarystreambase.hxx"
25
26 #include <com/sun/star/io/XSeekable.hpp>
27 #include <osl/diagnose.h>
28
29 namespace oox {
30
31 // ============================================================================
32
33 using namespace ::com::sun::star::io;
34 using namespace ::com::sun::star::uno;
35
36 // ============================================================================
37
~BinaryStreamBase()38 BinaryStreamBase::~BinaryStreamBase()
39 {
40 }
41
getRemaining() const42 sal_Int64 BinaryStreamBase::getRemaining() const
43 {
44 // do not use isSeekable(), implementations may provide stream position and size even if not seekable
45 sal_Int64 nPos = tell();
46 sal_Int64 nLen = size();
47 return ((nPos >= 0) && (nLen >= 0)) ? ::std::max< sal_Int64 >( nLen - nPos, 0 ) : -1;
48 }
49
alignToBlock(sal_Int32 nBlockSize,sal_Int64 nAnchorPos)50 void BinaryStreamBase::alignToBlock( sal_Int32 nBlockSize, sal_Int64 nAnchorPos )
51 {
52 sal_Int64 nStrmPos = tell();
53 // nothing to do, if stream is at anchor position
54 if( mbSeekable && (0 <= nAnchorPos) && (nAnchorPos != nStrmPos) && (nBlockSize > 1) )
55 {
56 // prevent modulo with negative arguments...
57 sal_Int64 nSkipSize = (nAnchorPos < nStrmPos) ?
58 (nBlockSize - ((nStrmPos - nAnchorPos - 1) % nBlockSize) - 1) :
59 ((nAnchorPos - nStrmPos) % nBlockSize);
60 seek( nStrmPos + nSkipSize );
61 }
62 }
63
64 // ============================================================================
65
BinaryXSeekableStream(const Reference<XSeekable> & rxSeekable)66 BinaryXSeekableStream::BinaryXSeekableStream( const Reference< XSeekable >& rxSeekable ) :
67 BinaryStreamBase( mxSeekable.is() ),
68 mxSeekable( rxSeekable )
69 {
70 }
71
~BinaryXSeekableStream()72 BinaryXSeekableStream::~BinaryXSeekableStream()
73 {
74 }
75
size() const76 sal_Int64 BinaryXSeekableStream::size() const
77 {
78 if( mxSeekable.is() ) try
79 {
80 return mxSeekable->getLength();
81 }
82 catch( Exception& )
83 {
84 OSL_ENSURE( false, "BinaryXSeekableStream::size - exception caught" );
85 }
86 return -1;
87 }
88
tell() const89 sal_Int64 BinaryXSeekableStream::tell() const
90 {
91 if( mxSeekable.is() ) try
92 {
93 return mxSeekable->getPosition();
94 }
95 catch( Exception& )
96 {
97 OSL_ENSURE( false, "BinaryXSeekableStream::tell - exception caught" );
98 }
99 return -1;
100 }
101
seek(sal_Int64 nPos)102 void BinaryXSeekableStream::seek( sal_Int64 nPos )
103 {
104 if( mxSeekable.is() ) try
105 {
106 mbEof = false;
107 mxSeekable->seek( nPos );
108 }
109 catch( Exception& )
110 {
111 mbEof = true;
112 }
113 }
114
close()115 void BinaryXSeekableStream::close()
116 {
117 mxSeekable.clear();
118 mbEof = true;
119 }
120
121 // ============================================================================
122
SequenceSeekableStream(const StreamDataSequence & rData)123 SequenceSeekableStream::SequenceSeekableStream( const StreamDataSequence& rData ) :
124 BinaryStreamBase( true ),
125 mpData( &rData ),
126 mnPos( 0 )
127 {
128 }
129
size() const130 sal_Int64 SequenceSeekableStream::size() const
131 {
132 return mpData ? mpData->getLength() : -1;
133 }
134
tell() const135 sal_Int64 SequenceSeekableStream::tell() const
136 {
137 return mpData ? mnPos : -1;
138 }
139
seek(sal_Int64 nPos)140 void SequenceSeekableStream::seek( sal_Int64 nPos )
141 {
142 if( mpData )
143 {
144 mnPos = getLimitedValue< sal_Int32, sal_Int64 >( nPos, 0, mpData->getLength() );
145 mbEof = mnPos != nPos;
146 }
147 }
148
close()149 void SequenceSeekableStream::close()
150 {
151 mpData = 0;
152 mbEof = true;
153 }
154
155 // ============================================================================
156
157 } // namespace oox
158