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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
#include <com/sun/star/uno/Sequence.hxx>
#include <assert.h>
using namespace com::sun::star::uno;
namespace io_stm
{
class MemRingBuffer
{
public:
MemRingBuffer();
virtual ~MemRingBuffer();
/***
* overwrites data at given position. Size is automatically extended, when
* data is written beyond end.
***/
/// @throws css::io::BufferSizeExceededException
void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &);
/// @throws css::io::BufferSizeExceededException
void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const;
sal_Int32 getSize() const throw();
/// @throws css::io::BufferSizeExceededException
void forgetFromStart(sal_Int32 nBytesToForget);
private:
/// @throws css::io::BufferSizeExceededException
void resizeBuffer(sal_Int32 nMinSize);
void checkInvariants() const {
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 );
(void) this; // avoid loplugin:staticmethods
}
sal_Int8 *m_p;
sal_Int32 m_nBufferLen;
sal_Int32 m_nStart;
sal_Int32 m_nOccupiedBuffer;
};
class MemFIFO :
private MemRingBuffer
{
public:
/// @throws css::io::BufferSizeExceededException
void write( const Sequence<sal_Int8> &);
/// @throws css::io::BufferSizeExceededException
void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead );
/// @throws css::io::BufferSizeExceededException
void skip( sal_Int32 nBytesToSkip );
sal_Int32 getSize() const throw()
{ return MemRingBuffer::getSize(); }
};
}
#endif // INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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