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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 <comphelper/seqstream.hxx>
21 :
22 : #include <memory.h>
23 :
24 : namespace comphelper
25 : {
26 : using namespace ::com::sun::star::lang;
27 : using namespace ::com::sun::star::io;
28 : using namespace ::com::sun::star::uno;
29 : using namespace ::osl;
30 :
31 :
32 : // class SequenceInputStream
33 :
34 :
35 :
36 0 : SequenceInputStream::SequenceInputStream(
37 : css::uno::Sequence<sal_Int8> const & rData)
38 : : m_aData(rData)
39 0 : , m_nPos(0)
40 : {
41 0 : }
42 :
43 : // checks if closed, returns available size, not mutex-protected
44 :
45 0 : inline sal_Int32 SequenceInputStream::avail()
46 : {
47 0 : if (m_nPos == -1)
48 0 : throw NotConnectedException(OUString(), *this);
49 :
50 0 : return m_aData.getLength() - m_nPos;
51 : }
52 :
53 : // com::sun::star::io::XInputStream
54 :
55 0 : sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
56 : throw(NotConnectedException, BufferSizeExceededException,
57 : IOException, RuntimeException, std::exception)
58 : {
59 0 : ::osl::MutexGuard aGuard( m_aMutex );
60 :
61 0 : sal_Int32 nAvail = avail();
62 :
63 0 : if (nBytesToRead < 0)
64 0 : throw BufferSizeExceededException(OUString(),*this);
65 :
66 0 : if (nAvail < nBytesToRead)
67 0 : nBytesToRead = nAvail;
68 :
69 0 : aData.realloc(nBytesToRead);
70 0 : memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
71 0 : m_nPos += nBytesToRead;
72 :
73 0 : return nBytesToRead;
74 : }
75 :
76 :
77 0 : sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
78 : throw(NotConnectedException, BufferSizeExceededException,
79 : IOException, RuntimeException, std::exception)
80 : {
81 : // all data is available at once
82 0 : return readBytes(aData, nMaxBytesToRead);
83 : }
84 :
85 :
86 0 : void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
87 : throw(NotConnectedException, BufferSizeExceededException,
88 : IOException, RuntimeException, std::exception)
89 : {
90 0 : ::osl::MutexGuard aGuard( m_aMutex );
91 :
92 0 : sal_Int32 nAvail = avail();
93 :
94 0 : if (nBytesToSkip < 0)
95 0 : throw BufferSizeExceededException(OUString(),*this);
96 :
97 0 : if (nAvail < nBytesToSkip)
98 0 : nBytesToSkip = nAvail;
99 :
100 0 : m_nPos += nBytesToSkip;
101 0 : }
102 :
103 :
104 0 : sal_Int32 SAL_CALL SequenceInputStream::available( )
105 : throw(NotConnectedException, IOException, RuntimeException, std::exception)
106 : {
107 0 : ::osl::MutexGuard aGuard( m_aMutex );
108 :
109 0 : return avail();
110 : }
111 :
112 :
113 0 : void SAL_CALL SequenceInputStream::closeInput( )
114 : throw(NotConnectedException, IOException, RuntimeException, std::exception)
115 : {
116 0 : if (m_nPos == -1)
117 0 : throw NotConnectedException(OUString(), *this);
118 :
119 0 : m_nPos = -1;
120 0 : }
121 :
122 0 : void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException, std::exception)
123 : {
124 0 : if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
125 0 : throw IllegalArgumentException();
126 0 : m_nPos = (sal_Int32) location;
127 0 : }
128 :
129 0 : sal_Int64 SAL_CALL SequenceInputStream::getPosition() throw (IOException, RuntimeException, std::exception)
130 : {
131 0 : return m_nPos;
132 : }
133 :
134 0 : sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException, std::exception)
135 : {
136 0 : return m_aData.getLength();
137 : }
138 :
139 :
140 0 : OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize, sal_Int32 _nMaximumResize)
141 : :m_rSequence(_rSeq)
142 : ,m_nResizeFactor(_nResizeFactor)
143 : ,m_nMinimumResize(_nMinimumResize)
144 : ,m_nMaximumResize(_nMaximumResize)
145 : ,m_nSize(0) // starting at position 0
146 0 : ,m_bConnected(true)
147 : {
148 : OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
149 : OSL_ENSURE((m_nMaximumResize < 0) || (m_nMaximumResize > m_nMinimumResize),
150 : "OSequenceOutputStream::OSequenceOutputStream : these limits don't make any sense !");
151 :
152 0 : if (m_nResizeFactor <= 1)
153 0 : m_nResizeFactor = 1.3;
154 0 : if ((m_nMaximumResize >= 0) && (m_nMaximumResize <= m_nMinimumResize))
155 0 : m_nMaximumResize = m_nMinimumResize * 2;
156 : // this heuristic is as good as any other ... supply better parameters if you don't like it :)
157 0 : }
158 :
159 :
160 0 : void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
161 : {
162 0 : MutexGuard aGuard(m_aMutex);
163 0 : if (!m_bConnected)
164 0 : throw NotConnectedException();
165 :
166 : // ensure the sequence has enough space left
167 0 : if (m_nSize + _rData.getLength() > m_rSequence.getLength())
168 : {
169 0 : sal_Int32 nCurrentLength = m_rSequence.getLength();
170 : sal_Int32 nNewLength = static_cast< sal_Int32 >(
171 0 : nCurrentLength * m_nResizeFactor);
172 :
173 0 : if (m_nMinimumResize > nNewLength - nCurrentLength)
174 : // we have a minimum so it's not too inefficient for small sequences and small write requests
175 0 : nNewLength = nCurrentLength + m_nMinimumResize;
176 :
177 0 : if ((m_nMaximumResize > 0) && (nNewLength - nCurrentLength > m_nMaximumResize))
178 : // such a large step is not allowed
179 0 : nNewLength = nCurrentLength + m_nMaximumResize;
180 :
181 0 : if (nNewLength < m_nSize + _rData.getLength())
182 : { // it's not enough .... the data would not fit
183 :
184 : // let's take the double amount of the length of the data to be written, as the next write
185 : // request could be as large as this one
186 0 : sal_Int32 nNewGrowth = _rData.getLength() * 2;
187 0 : if ((m_nMaximumResize > 0) && (nNewGrowth > m_nMaximumResize))
188 : { // we came to the limit, again ...
189 0 : nNewGrowth = m_nMaximumResize;
190 0 : if (nNewGrowth + nCurrentLength < m_nSize + _rData.getLength())
191 : // but it would not fit if we respect the limit
192 0 : nNewGrowth = m_nSize + _rData.getLength() - nCurrentLength;
193 : }
194 0 : nNewLength = nCurrentLength + nNewGrowth;
195 : }
196 :
197 : // round it off to the next multiple of 4 ...
198 0 : nNewLength = (nNewLength + 3) / 4 * 4;
199 :
200 0 : m_rSequence.realloc(nNewLength);
201 : }
202 :
203 : OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
204 : "ooops ... the realloc algorithm seems to be wrong :( !");
205 :
206 0 : memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
207 0 : m_nSize += _rData.getLength();
208 0 : }
209 :
210 :
211 0 : void SAL_CALL OSequenceOutputStream::flush( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
212 : {
213 0 : MutexGuard aGuard(m_aMutex);
214 0 : if (!m_bConnected)
215 0 : throw NotConnectedException();
216 :
217 : // cut the sequence to the real size
218 0 : m_rSequence.realloc(m_nSize);
219 0 : }
220 :
221 :
222 0 : void SAL_CALL OSequenceOutputStream::closeOutput( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
223 : {
224 0 : MutexGuard aGuard(m_aMutex);
225 0 : if (!m_bConnected)
226 0 : throw NotConnectedException();
227 :
228 : // cut the sequence to the real size
229 0 : m_rSequence.realloc(m_nSize);
230 : // and don't allow any further accesses
231 0 : m_bConnected = false;
232 0 : }
233 :
234 : } // namespace comphelper
235 :
236 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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