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See the 18*cdf0e10cSrcweir * GNU Lesser General Public License version 3 for more details 19*cdf0e10cSrcweir * (a copy is included in the LICENSE file that accompanied this code). 20*cdf0e10cSrcweir * 21*cdf0e10cSrcweir * You should have received a copy of the GNU Lesser General Public License 22*cdf0e10cSrcweir * version 3 along with OpenOffice.org. If not, see 23*cdf0e10cSrcweir * <http://www.openoffice.org/license.html> 24*cdf0e10cSrcweir * for a copy of the LGPLv3 License. 25*cdf0e10cSrcweir * 26*cdf0e10cSrcweir ************************************************************************/ 27*cdf0e10cSrcweir 28*cdf0e10cSrcweir // MARKER(update_precomp.py): autogen include statement, do not remove 29*cdf0e10cSrcweir #include "precompiled_comphelper.hxx" 30*cdf0e10cSrcweir #include <comphelper/streamsection.hxx> 31*cdf0e10cSrcweir #include <osl/diagnose.h> 32*cdf0e10cSrcweir 33*cdf0e10cSrcweir namespace comphelper 34*cdf0e10cSrcweir { 35*cdf0e10cSrcweir 36*cdf0e10cSrcweir //------------------------------------------------------------------------- 37*cdf0e10cSrcweir OStreamSection::OStreamSection(const staruno::Reference< stario::XDataInputStream >& _rxInput) 38*cdf0e10cSrcweir :m_xMarkStream(_rxInput, ::com::sun::star::uno::UNO_QUERY) 39*cdf0e10cSrcweir ,m_xInStream(_rxInput) 40*cdf0e10cSrcweir ,m_nBlockStart(-1) 41*cdf0e10cSrcweir ,m_nBlockLen(-1) 42*cdf0e10cSrcweir { 43*cdf0e10cSrcweir OSL_ENSURE(m_xInStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !"); 44*cdf0e10cSrcweir if (m_xInStream.is() && m_xMarkStream.is()) 45*cdf0e10cSrcweir { 46*cdf0e10cSrcweir m_nBlockLen = _rxInput->readLong(); 47*cdf0e10cSrcweir m_nBlockStart = m_xMarkStream->createMark(); 48*cdf0e10cSrcweir } 49*cdf0e10cSrcweir } 50*cdf0e10cSrcweir 51*cdf0e10cSrcweir //------------------------------------------------------------------------- 52*cdf0e10cSrcweir OStreamSection::OStreamSection(const staruno::Reference< stario::XDataOutputStream >& _rxOutput, sal_Int32 _nPresumedLength) 53*cdf0e10cSrcweir :m_xMarkStream(_rxOutput, ::com::sun::star::uno::UNO_QUERY) 54*cdf0e10cSrcweir ,m_xOutStream(_rxOutput) 55*cdf0e10cSrcweir ,m_nBlockStart(-1) 56*cdf0e10cSrcweir ,m_nBlockLen(-1) 57*cdf0e10cSrcweir { 58*cdf0e10cSrcweir OSL_ENSURE(m_xOutStream.is() && m_xMarkStream.is(), "OStreamSection::OStreamSection : invalid argument !"); 59*cdf0e10cSrcweir if (m_xOutStream.is() && m_xMarkStream.is()) 60*cdf0e10cSrcweir { 61*cdf0e10cSrcweir m_nBlockStart = m_xMarkStream->createMark(); 62*cdf0e10cSrcweir // a placeholder where we will write the overall length (within the destructor) 63*cdf0e10cSrcweir if (_nPresumedLength > 0) 64*cdf0e10cSrcweir m_nBlockLen = _nPresumedLength + sizeof(m_nBlockLen); 65*cdf0e10cSrcweir // as the caller did not consider - of course - the placeholder we are going to write 66*cdf0e10cSrcweir else 67*cdf0e10cSrcweir m_nBlockLen = 0; 68*cdf0e10cSrcweir m_xOutStream->writeLong(m_nBlockLen); 69*cdf0e10cSrcweir } 70*cdf0e10cSrcweir } 71*cdf0e10cSrcweir 72*cdf0e10cSrcweir //------------------------------------------------------------------------- 73*cdf0e10cSrcweir OStreamSection::~OStreamSection() 74*cdf0e10cSrcweir { 75*cdf0e10cSrcweir try 76*cdf0e10cSrcweir { // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception 77*cdf0e10cSrcweir // handling routing 78*cdf0e10cSrcweir if (m_xInStream.is() && m_xMarkStream.is()) 79*cdf0e10cSrcweir { // we're working on an input stream 80*cdf0e10cSrcweir m_xMarkStream->jumpToMark(m_nBlockStart); 81*cdf0e10cSrcweir m_xInStream->skipBytes(m_nBlockLen); 82*cdf0e10cSrcweir m_xMarkStream->deleteMark(m_nBlockStart); 83*cdf0e10cSrcweir } 84*cdf0e10cSrcweir else if (m_xOutStream.is() && m_xMarkStream.is()) 85*cdf0e10cSrcweir { 86*cdf0e10cSrcweir sal_Int32 nRealBlockLength = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen); 87*cdf0e10cSrcweir if (m_nBlockLen && (m_nBlockLen == nRealBlockLength)) 88*cdf0e10cSrcweir // nothing to do : the estimation the caller gave us (in the ctor) was correct 89*cdf0e10cSrcweir m_xMarkStream->deleteMark(m_nBlockStart); 90*cdf0e10cSrcweir else 91*cdf0e10cSrcweir { // the estimation was wrong (or we didn't get one) 92*cdf0e10cSrcweir m_nBlockLen = nRealBlockLength; 93*cdf0e10cSrcweir m_xMarkStream->jumpToMark(m_nBlockStart); 94*cdf0e10cSrcweir m_xOutStream->writeLong(m_nBlockLen); 95*cdf0e10cSrcweir m_xMarkStream->jumpToFurthest(); 96*cdf0e10cSrcweir m_xMarkStream->deleteMark(m_nBlockStart); 97*cdf0e10cSrcweir } 98*cdf0e10cSrcweir } 99*cdf0e10cSrcweir } 100*cdf0e10cSrcweir catch(const staruno::Exception&) 101*cdf0e10cSrcweir { 102*cdf0e10cSrcweir } 103*cdf0e10cSrcweir } 104*cdf0e10cSrcweir // ----------------------------------------------------------------------------- 105*cdf0e10cSrcweir sal_Int32 OStreamSection::available() 106*cdf0e10cSrcweir { 107*cdf0e10cSrcweir sal_Int32 nBytes = 0; 108*cdf0e10cSrcweir try 109*cdf0e10cSrcweir { // don't allow any exceptions to leave this block, this may be called during the stack unwinding of an exception 110*cdf0e10cSrcweir if (m_xInStream.is() && m_xMarkStream.is()) 111*cdf0e10cSrcweir nBytes = m_xMarkStream->offsetToMark(m_nBlockStart) - sizeof(m_nBlockLen); 112*cdf0e10cSrcweir } 113*cdf0e10cSrcweir catch(const staruno::Exception&) 114*cdf0e10cSrcweir { 115*cdf0e10cSrcweir } 116*cdf0e10cSrcweir return nBytes; 117*cdf0e10cSrcweir } 118*cdf0e10cSrcweir // ----------------------------------------------------------------------------- 119*cdf0e10cSrcweir 120*cdf0e10cSrcweir } // namespace comphelper 121*cdf0e10cSrcweir 122*cdf0e10cSrcweir 123