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11 * http://www.apache.org/licenses/LICENSE-2.0
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21
22
23
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_comphelper.hxx"
26 #include <comphelper/seqstream.hxx>
27
28 #include <memory.h> // for memcpy
29
30 namespace comphelper
31 {
32 using namespace ::com::sun::star::lang;
33 using namespace ::com::sun::star::io;
34 using namespace ::com::sun::star::uno;
35 using namespace ::osl;
36
37 //---------------------------------------------------------------------------------------------
38 // class SequenceInputStream
39 //---------------------------------------------------------------------------------------------
40
41 //------------------------------------------------------------------
SequenceInputStream(const ByteSequence & rData)42 SequenceInputStream::SequenceInputStream(const ByteSequence& rData)
43 : m_aData(rData)
44 , m_nPos(0)
45 {
46 }
47
48 // checks if closed, returns available size, not mutex-protected
49 //------------------------------------------------------------------
avail()50 inline sal_Int32 SequenceInputStream::avail()
51 {
52 if (m_nPos == -1)
53 throw NotConnectedException(::rtl::OUString(), *this);
54
55 return m_aData.getLength() - m_nPos;
56 }
57
58 // com::sun::star::io::XInputStream
59 //------------------------------------------------------------------
readBytes(Sequence<sal_Int8> & aData,sal_Int32 nBytesToRead)60 sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
61 throw(NotConnectedException, BufferSizeExceededException,
62 IOException, RuntimeException)
63 {
64 ::osl::MutexGuard aGuard( m_aMutex );
65
66 sal_Int32 nAvail = avail();
67
68 if (nBytesToRead < 0)
69 throw BufferSizeExceededException(::rtl::OUString(),*this);
70
71 if (nAvail < nBytesToRead)
72 nBytesToRead = nAvail;
73
74 aData.realloc(nBytesToRead);
75 memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
76 m_nPos += nBytesToRead;
77
78 return nBytesToRead;
79 }
80
81 //------------------------------------------------------------------
readSomeBytes(Sequence<sal_Int8> & aData,sal_Int32 nMaxBytesToRead)82 sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
83 throw(NotConnectedException, BufferSizeExceededException,
84 IOException, RuntimeException)
85 {
86 // all data is available at once
87 return readBytes(aData, nMaxBytesToRead);
88 }
89
90 //------------------------------------------------------------------
skipBytes(sal_Int32 nBytesToSkip)91 void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
92 throw(NotConnectedException, BufferSizeExceededException,
93 IOException, RuntimeException)
94 {
95 ::osl::MutexGuard aGuard( m_aMutex );
96
97 sal_Int32 nAvail = avail();
98
99 if (nBytesToSkip < 0)
100 throw BufferSizeExceededException(::rtl::OUString(),*this);
101
102 if (nAvail < nBytesToSkip)
103 nBytesToSkip = nAvail;
104
105 m_nPos += nBytesToSkip;
106 }
107
108 //------------------------------------------------------------------
available()109 sal_Int32 SAL_CALL SequenceInputStream::available( )
110 throw(NotConnectedException, IOException, RuntimeException)
111 {
112 ::osl::MutexGuard aGuard( m_aMutex );
113
114 return avail();
115 }
116
117 //------------------------------------------------------------------
closeInput()118 void SAL_CALL SequenceInputStream::closeInput( )
119 throw(NotConnectedException, IOException, RuntimeException)
120 {
121 if (m_nPos == -1)
122 throw NotConnectedException(::rtl::OUString(), *this);
123
124 m_nPos = -1;
125 }
126
seek(sal_Int64 location)127 void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException)
128 {
129 if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
130 throw IllegalArgumentException();
131 m_nPos = (sal_Int32) location;
132 }
133
getPosition()134 sal_Int64 SAL_CALL SequenceInputStream::getPosition() throw (IOException, RuntimeException)
135 {
136 return m_nPos;
137 }
138
getLength()139 sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException)
140 {
141 return m_aData.getLength();
142 }
143
144 //--------------------------------------------------------------------------
OSequenceOutputStream(Sequence<sal_Int8> & _rSeq,double _nResizeFactor,sal_Int32 _nMinimumResize,sal_Int32 _nMaximumResize)145 OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize, sal_Int32 _nMaximumResize)
146 :m_rSequence(_rSeq)
147 ,m_nResizeFactor(_nResizeFactor)
148 ,m_nMinimumResize(_nMinimumResize)
149 ,m_nMaximumResize(_nMaximumResize)
150 ,m_nSize(0) // starting at position 0
151 ,m_bConnected(sal_True)
152 {
153 OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
154 OSL_ENSURE((m_nMaximumResize < 0) || (m_nMaximumResize > m_nMinimumResize),
155 "OSequenceOutputStream::OSequenceOutputStream : these limits don't make any sense !");
156
157 if (m_nResizeFactor <= 1)
158 m_nResizeFactor = 1.3;
159 if ((m_nMaximumResize >= 0) && (m_nMaximumResize <= m_nMinimumResize))
160 m_nMaximumResize = m_nMinimumResize * 2;
161 // this heuristic is as good as any other ... supply better parameters if you don't like it :)
162 }
163
164 //--------------------------------------------------------------------------
writeBytes(const Sequence<sal_Int8> & _rData)165 void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
166 {
167 MutexGuard aGuard(m_aMutex);
168 if (!m_bConnected)
169 throw NotConnectedException();
170
171 // ensure the sequence has enoungh space left
172 if (m_nSize + _rData.getLength() > m_rSequence.getLength())
173 {
174 sal_Int32 nCurrentLength = m_rSequence.getLength();
175 sal_Int32 nNewLength = static_cast< sal_Int32 >(
176 nCurrentLength * m_nResizeFactor);
177
178 if (m_nMinimumResize > nNewLength - nCurrentLength)
179 // we have a minimum so it's not too inefficient for small sequences and small write requests
180 nNewLength = nCurrentLength + m_nMinimumResize;
181
182 if ((m_nMaximumResize > 0) && (nNewLength - nCurrentLength > m_nMaximumResize))
183 // such a large step is not allowed
184 nNewLength = nCurrentLength + m_nMaximumResize;
185
186 if (nNewLength < m_nSize + _rData.getLength())
187 { // it's not enough .... the data would not fit
188
189 // let's take the double amount of the length of the data to be written, as the next write
190 // request could be as large as this one
191 sal_Int32 nNewGrowth = _rData.getLength() * 2;
192 if ((m_nMaximumResize > 0) && (nNewGrowth > m_nMaximumResize))
193 { // we came to the limit, again ...
194 nNewGrowth = m_nMaximumResize;
195 if (nNewGrowth + nCurrentLength < m_nSize + _rData.getLength())
196 // but it would not fit if we respect the limit
197 nNewGrowth = m_nSize + _rData.getLength() - nCurrentLength;
198 }
199 nNewLength = nCurrentLength + nNewGrowth;
200 }
201
202 // round it off to the next multiple of 4 ...
203 nNewLength = (nNewLength + 3) / 4 * 4;
204
205 m_rSequence.realloc(nNewLength);
206 }
207
208 OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
209 "ooops ... the realloc algorithm seems to be wrong :( !");
210
211 memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
212 m_nSize += _rData.getLength();
213 }
214
215 //--------------------------------------------------------------------------
flush()216 void SAL_CALL OSequenceOutputStream::flush( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
217 {
218 MutexGuard aGuard(m_aMutex);
219 if (!m_bConnected)
220 throw NotConnectedException();
221
222 // cut the sequence to the real size
223 m_rSequence.realloc(m_nSize);
224 }
225
226 //--------------------------------------------------------------------------
closeOutput()227 void SAL_CALL OSequenceOutputStream::closeOutput( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
228 {
229 MutexGuard aGuard(m_aMutex);
230 if (!m_bConnected)
231 throw NotConnectedException();
232
233 // cut the sequence to the real size
234 m_rSequence.realloc(m_nSize);
235 // and don't allow any further accesses
236 m_bConnected = sal_False;
237 }
238
239 } // namespace comphelper
240