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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
#define INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
// Save NDEBUG state
#ifdef NDEBUG
#define STREAMHELPER_HXX_HAD_NDEBUG
#undef NDEBUG
#endif
#if OSL_DEBUG_LEVEL == 0
#define NDEBUG
#endif
#include <assert.h>
#define Max( a, b ) (((a)>(b)) ? (a) : (b) )
#define Min( a, b ) (((a)<(b)) ? (a) : (b) )
namespace io_stm {
class I_FIFO_OutOfBoundsException :
public Exception
{};
class I_FIFO_OutOfMemoryException :
public Exception
{};
class I_FIFO
{
public:
virtual void write( const Sequence<sal_Int8> &) throw( I_FIFO_OutOfMemoryException,
I_FIFO_OutOfBoundsException )=0;
virtual void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead )
throw( I_FIFO_OutOfBoundsException )=0;
virtual void skip( sal_Int32 nBytesToSkip )
throw( I_FIFO_OutOfBoundsException )=0;
virtual sal_Int32 getSize() const throw( ) =0;
virtual void shrink() throw() = 0;
virtual ~I_FIFO() {};
};
class IRingBuffer_OutOfBoundsException :
public Exception
{};
class IRingBuffer_OutOfMemoryException :
public Exception
{};
class IRingBuffer
{
public:
/***
* overwrites data at given position. Size is automatically extended, when
* data is written beyond end.
*
***/
virtual void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &)
throw( IRingBuffer_OutOfMemoryException,
IRingBuffer_OutOfBoundsException )=0;
virtual void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const
throw( IRingBuffer_OutOfBoundsException )=0;
virtual sal_Int32 getSize() const throw( ) =0;
virtual void forgetFromStart( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException)=0;
virtual void forgetFromEnd( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException)=0;
virtual void shrink() throw() = 0;
virtual ~IRingBuffer() {};
};
class MemRingBuffer :
public IRingBuffer
{
public:
MemRingBuffer();
virtual ~MemRingBuffer();
virtual void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &)
throw( IRingBuffer_OutOfMemoryException,
IRingBuffer_OutOfBoundsException ) SAL_OVERRIDE;
virtual void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const
throw( IRingBuffer_OutOfBoundsException ) SAL_OVERRIDE;
virtual sal_Int32 getSize() const throw( ) SAL_OVERRIDE;
virtual void forgetFromStart( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException) SAL_OVERRIDE;
virtual void forgetFromEnd( sal_Int32 nBytesToForget ) throw(IRingBuffer_OutOfBoundsException) SAL_OVERRIDE;
virtual void shrink() throw() SAL_OVERRIDE;
private:
void resizeBuffer( sal_Int32 nMinSize ) throw( IRingBuffer_OutOfMemoryException );
inline void checkInvariants()
{
assert( m_nBufferLen >= 0 );
assert( m_nOccupiedBuffer >= 0 );
assert( m_nOccupiedBuffer <= m_nBufferLen );
assert( m_nStart >= 0 );
assert( 0 == m_nStart || m_nStart < m_nBufferLen );
}
sal_Int8 *m_p;
sal_Int32 m_nBufferLen;
sal_Int32 m_nStart;
sal_Int32 m_nOccupiedBuffer;
};
class MemFIFO :
public I_FIFO,
private MemRingBuffer
{
public:
virtual void write( const Sequence<sal_Int8> &) throw( I_FIFO_OutOfMemoryException,
I_FIFO_OutOfBoundsException ) SAL_OVERRIDE;
virtual void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead )
throw( I_FIFO_OutOfBoundsException ) SAL_OVERRIDE;
virtual void skip( sal_Int32 nBytesToSkip ) throw( I_FIFO_OutOfBoundsException ) SAL_OVERRIDE;
virtual sal_Int32 getSize() const throw( ) SAL_OVERRIDE
{ return MemRingBuffer::getSize(); }
virtual void shrink() throw() SAL_OVERRIDE
{ MemRingBuffer::shrink(); }
};
// Restore NDEBUG state
#ifdef STREAMHELPER_HXX_HAD_NDEBUG
#define NDEBUG
#else
#undef NDEBUG
#endif
}
#endif // INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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