162 lines
5.3 KiB
C++
162 lines
5.3 KiB
C++
/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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// Save NDEBUG state
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#ifdef NDEBUG
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#define STREAMHELPER_HXX_HAD_NDEBUG
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#undef NDEBUG
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#endif
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#if OSL_DEBUG_LEVEL == 0
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#define NDEBUG
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#endif
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#include <assert.h>
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#define Max( a, b ) (((a)>(b)) ? (a) : (b) )
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#define Min( a, b ) (((a)<(b)) ? (a) : (b) )
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namespace io_stm {
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class I_FIFO_OutOfBoundsException :
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public Exception
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{};
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class I_FIFO_OutOfMemoryException :
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public Exception
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{};
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class I_FIFO
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{
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public:
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virtual void write( const Sequence<sal_Int8> &) throw( I_FIFO_OutOfMemoryException,
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I_FIFO_OutOfBoundsException )=0;
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virtual void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead )
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throw( I_FIFO_OutOfBoundsException )=0;
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virtual void skip( sal_Int32 nBytesToSkip )
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throw( I_FIFO_OutOfBoundsException )=0;
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virtual sal_Int32 getSize() const throw( ) =0;
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virtual void shrink() throw() = 0;
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virtual ~I_FIFO() {};
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};
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class IRingBuffer_OutOfBoundsException :
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public Exception
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{};
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class IRingBuffer_OutOfMemoryException :
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public Exception
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{};
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class IRingBuffer
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{
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public:
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/***
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* overwrites data at given position. Size is automatically extended, when
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* data is written beyond end.
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*
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***/
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virtual void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &)
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throw( IRingBuffer_OutOfMemoryException,
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IRingBuffer_OutOfBoundsException )=0;
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virtual void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const
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throw( IRingBuffer_OutOfBoundsException )=0;
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virtual sal_Int32 getSize() const throw( ) =0;
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virtual void forgetFromStart( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException)=0;
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virtual void forgetFromEnd( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException)=0;
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virtual void shrink() throw() = 0;
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virtual ~IRingBuffer() {};
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};
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class MemRingBuffer :
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public IRingBuffer
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{
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public:
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MemRingBuffer();
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virtual ~MemRingBuffer();
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virtual void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &)
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throw( IRingBuffer_OutOfMemoryException,
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IRingBuffer_OutOfBoundsException );
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virtual void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const
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throw( IRingBuffer_OutOfBoundsException );
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virtual sal_Int32 getSize() const throw( );
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virtual void forgetFromStart( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException);
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virtual void forgetFromEnd( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException);
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virtual void shrink() throw();
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private:
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void resizeBuffer( sal_Int32 nMinSize ) throw( IRingBuffer_OutOfMemoryException );
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inline void checkInvariants()
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{
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assert( m_nBufferLen >= 0 );
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assert( m_nOccupiedBuffer >= 0 );
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assert( m_nOccupiedBuffer <= m_nBufferLen );
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assert( m_nStart >= 0 );
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assert( 0 == m_nStart || m_nStart < m_nBufferLen );
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}
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sal_Int8 *m_p;
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sal_Int32 m_nBufferLen;
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sal_Int32 m_nStart;
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sal_Int32 m_nOccupiedBuffer;
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};
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class MemFIFO :
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public I_FIFO,
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private MemRingBuffer
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{
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public:
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virtual void write( const Sequence<sal_Int8> &) throw( I_FIFO_OutOfMemoryException,
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I_FIFO_OutOfBoundsException );
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virtual void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead )
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throw( I_FIFO_OutOfBoundsException );
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virtual void skip( sal_Int32 nBytesToSkip ) throw( I_FIFO_OutOfBoundsException );
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virtual sal_Int32 getSize() const throw( )
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{ return MemRingBuffer::getSize(); }
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virtual void shrink() throw()
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{ MemRingBuffer::shrink(); }
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};
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// Restore NDEBUG state
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#ifdef STREAMHELPER_HXX_HAD_NDEBUG
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#define NDEBUG
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#else
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#undef NDEBUG
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#endif
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}
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