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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 <osl/diagnose.h>
23 :
24 : #include <memory.h>
25 :
26 : namespace comphelper
27 : {
28 : using namespace ::com::sun::star::lang;
29 : using namespace ::com::sun::star::io;
30 : using namespace ::com::sun::star::uno;
31 : using namespace ::osl;
32 :
33 :
34 : // class SequenceInputStream
35 :
36 :
37 :
38 5250 : SequenceInputStream::SequenceInputStream(
39 : css::uno::Sequence<sal_Int8> const & rData)
40 : : m_aData(rData)
41 5250 : , m_nPos(0)
42 : {
43 5250 : }
44 :
45 : // checks if closed, returns available size, not mutex-protected
46 :
47 16032 : inline sal_Int32 SequenceInputStream::avail()
48 : {
49 16032 : if (m_nPos == -1)
50 0 : throw NotConnectedException(OUString(), *this);
51 :
52 16032 : return m_aData.getLength() - m_nPos;
53 : }
54 :
55 : // com::sun::star::io::XInputStream
56 :
57 16032 : sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
58 : throw(NotConnectedException, BufferSizeExceededException,
59 : IOException, RuntimeException, std::exception)
60 : {
61 16032 : ::osl::MutexGuard aGuard( m_aMutex );
62 :
63 16032 : sal_Int32 nAvail = avail();
64 :
65 16032 : if (nBytesToRead < 0)
66 0 : throw BufferSizeExceededException(OUString(),*this);
67 :
68 16032 : if (nAvail < nBytesToRead)
69 11842 : nBytesToRead = nAvail;
70 :
71 16032 : aData.realloc(nBytesToRead);
72 16032 : memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
73 16032 : m_nPos += nBytesToRead;
74 :
75 16032 : return nBytesToRead;
76 : }
77 :
78 :
79 671 : sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
80 : throw(NotConnectedException, BufferSizeExceededException,
81 : IOException, RuntimeException, std::exception)
82 : {
83 : // all data is available at once
84 671 : return readBytes(aData, nMaxBytesToRead);
85 : }
86 :
87 :
88 0 : void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
89 : throw(NotConnectedException, BufferSizeExceededException,
90 : IOException, RuntimeException, std::exception)
91 : {
92 0 : ::osl::MutexGuard aGuard( m_aMutex );
93 :
94 0 : sal_Int32 nAvail = avail();
95 :
96 0 : if (nBytesToSkip < 0)
97 0 : throw BufferSizeExceededException(OUString(),*this);
98 :
99 0 : if (nAvail < nBytesToSkip)
100 0 : nBytesToSkip = nAvail;
101 :
102 0 : m_nPos += nBytesToSkip;
103 0 : }
104 :
105 :
106 0 : sal_Int32 SAL_CALL SequenceInputStream::available( )
107 : throw(NotConnectedException, IOException, RuntimeException, std::exception)
108 : {
109 0 : ::osl::MutexGuard aGuard( m_aMutex );
110 :
111 0 : return avail();
112 : }
113 :
114 :
115 31 : void SAL_CALL SequenceInputStream::closeInput( )
116 : throw(NotConnectedException, IOException, RuntimeException, std::exception)
117 : {
118 31 : if (m_nPos == -1)
119 0 : throw NotConnectedException(OUString(), *this);
120 :
121 31 : m_nPos = -1;
122 31 : }
123 :
124 12081 : void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException, std::exception)
125 : {
126 12081 : if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
127 1 : throw IllegalArgumentException();
128 12080 : m_nPos = (sal_Int32) location;
129 12080 : }
130 :
131 123 : sal_Int64 SAL_CALL SequenceInputStream::getPosition() throw (IOException, RuntimeException, std::exception)
132 : {
133 123 : return m_nPos;
134 : }
135 :
136 11430 : sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException, std::exception)
137 : {
138 11430 : return m_aData.getLength();
139 : }
140 :
141 :
142 2 : OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize, sal_Int32 _nMaximumResize)
143 : :m_rSequence(_rSeq)
144 : ,m_nResizeFactor(_nResizeFactor)
145 : ,m_nMinimumResize(_nMinimumResize)
146 : ,m_nMaximumResize(_nMaximumResize)
147 : ,m_nSize(0) // starting at position 0
148 2 : ,m_bConnected(true)
149 : {
150 : OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
151 : OSL_ENSURE((m_nMaximumResize < 0) || (m_nMaximumResize > m_nMinimumResize),
152 : "OSequenceOutputStream::OSequenceOutputStream : these limits don't make any sense !");
153 :
154 2 : if (m_nResizeFactor <= 1)
155 0 : m_nResizeFactor = 1.3;
156 2 : if ((m_nMaximumResize >= 0) && (m_nMaximumResize <= m_nMinimumResize))
157 0 : m_nMaximumResize = m_nMinimumResize * 2;
158 : // this heuristic is as good as any other ... supply better parameters if you don't like it :)
159 2 : }
160 :
161 :
162 1 : void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
163 : {
164 1 : MutexGuard aGuard(m_aMutex);
165 1 : if (!m_bConnected)
166 0 : throw NotConnectedException();
167 :
168 : // ensure the sequence has enough space left
169 1 : if (m_nSize + _rData.getLength() > m_rSequence.getLength())
170 : {
171 1 : sal_Int32 nCurrentLength = m_rSequence.getLength();
172 : sal_Int32 nNewLength = static_cast< sal_Int32 >(
173 1 : nCurrentLength * m_nResizeFactor);
174 :
175 1 : if (m_nMinimumResize > nNewLength - nCurrentLength)
176 : // we have a minimum so it's not too inefficient for small sequences and small write requests
177 1 : nNewLength = nCurrentLength + m_nMinimumResize;
178 :
179 1 : if ((m_nMaximumResize > 0) && (nNewLength - nCurrentLength > m_nMaximumResize))
180 : // such a large step is not allowed
181 0 : nNewLength = nCurrentLength + m_nMaximumResize;
182 :
183 1 : if (nNewLength < m_nSize + _rData.getLength())
184 : { // it's not enough .... the data would not fit
185 :
186 : // let's take the double amount of the length of the data to be written, as the next write
187 : // request could be as large as this one
188 0 : sal_Int32 nNewGrowth = _rData.getLength() * 2;
189 0 : if ((m_nMaximumResize > 0) && (nNewGrowth > m_nMaximumResize))
190 : { // we came to the limit, again ...
191 0 : nNewGrowth = m_nMaximumResize;
192 0 : if (nNewGrowth + nCurrentLength < m_nSize + _rData.getLength())
193 : // but it would not fit if we respect the limit
194 0 : nNewGrowth = m_nSize + _rData.getLength() - nCurrentLength;
195 : }
196 0 : nNewLength = nCurrentLength + nNewGrowth;
197 : }
198 :
199 : // round it off to the next multiple of 4 ...
200 1 : nNewLength = (nNewLength + 3) / 4 * 4;
201 :
202 1 : m_rSequence.realloc(nNewLength);
203 : }
204 :
205 : OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
206 : "ooops ... the realloc algorithm seems to be wrong :( !");
207 :
208 1 : memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
209 1 : m_nSize += _rData.getLength();
210 1 : }
211 :
212 :
213 1 : void SAL_CALL OSequenceOutputStream::flush( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
214 : {
215 1 : MutexGuard aGuard(m_aMutex);
216 1 : if (!m_bConnected)
217 0 : throw NotConnectedException();
218 :
219 : // cut the sequence to the real size
220 1 : m_rSequence.realloc(m_nSize);
221 1 : }
222 :
223 :
224 2 : void SAL_CALL OSequenceOutputStream::closeOutput( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
225 : {
226 2 : MutexGuard aGuard(m_aMutex);
227 2 : if (!m_bConnected)
228 0 : throw NotConnectedException();
229 :
230 : // cut the sequence to the real size
231 2 : m_rSequence.realloc(m_nSize);
232 : // and don't allow any further accesses
233 2 : m_bConnected = false;
234 2 : }
235 :
236 : } // namespace comphelper
237 :
238 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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