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