comphelper/source/streaming/seqstream.cxx

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