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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: MemoryByteGrabber.hxx,v $
*
* $Revision: 1.4 $
*
* last change: $Author: rt $ $Date: 2005-09-08 16:12:48 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef _MEMORY_BYTE_GRABBER_HXX_
#define _MEMORY_BYTE_GRABBER_HXX_
#ifndef _COM_SUN_STAR_IO_XINPUTSTREAM_HPP_
#include <com/sun/star/io/XInputStream.hpp>
#endif
#ifndef _COM_SUN_STAR_IO_XSEEKABLE_HPP_
#include <com/sun/star/io/XSeekable.hpp>
#endif
class MemoryByteGrabber
{
protected:
const com::sun::star::uno::Sequence < sal_Int8 > maBuffer;
const sal_Int8 *mpBuffer;
sal_Int32 mnCurrent, mnEnd;
public:
MemoryByteGrabber ( const com::sun::star::uno::Sequence < sal_Int8 > & rBuffer )
: maBuffer ( rBuffer )
, mnCurrent ( 0 )
, mpBuffer ( rBuffer.getConstArray() )
, mnEnd ( rBuffer.getLength() )
{
}
MemoryByteGrabber()
{
}
const sal_Int8 * getCurrentPos () { return mpBuffer + mnCurrent; }
// XInputStream chained
sal_Int32 SAL_CALL readBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
sal_Int32 nBytesToRead )
throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
if ( nBytesToRead < 0)
throw com::sun::star::io::BufferSizeExceededException();
if (nBytesToRead + mnCurrent > mnEnd)
nBytesToRead = mnEnd - mnCurrent;
aData.realloc ( nBytesToRead );
memcpy ( aData.getArray(), mpBuffer + mnCurrent, nBytesToRead );
mnCurrent += nBytesToRead;
return nBytesToRead;
}
sal_Int32 SAL_CALL readSomeBytes( com::sun::star::uno::Sequence< sal_Int8 >& aData,
sal_Int32 nMaxBytesToRead )
throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
return readBytes( aData, nMaxBytesToRead );
}
void SAL_CALL skipBytes( sal_Int32 nBytesToSkip )
throw(com::sun::star::io::NotConnectedException, com::sun::star::io::BufferSizeExceededException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
mnCurrent += nBytesToSkip;
}
sal_Int32 SAL_CALL available( )
throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
return mnEnd - mnCurrent;
}
void SAL_CALL closeInput( )
throw(com::sun::star::io::NotConnectedException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
}
// XSeekable chained...
sal_Int64 SAL_CALL seek( sal_Int64 location )
throw(com::sun::star::lang::IllegalArgumentException, com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
if ( location < 0 || location > mnEnd )
throw com::sun::star::lang::IllegalArgumentException ();
mnCurrent = static_cast < sal_Int32 > ( location );
return mnCurrent;
}
sal_Int64 SAL_CALL getPosition( )
throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
return mnCurrent;
}
sal_Int64 SAL_CALL getLength( )
throw(com::sun::star::io::IOException, com::sun::star::uno::RuntimeException)
{
return mnEnd;
}
MemoryByteGrabber& operator >> (sal_Int8& rInt8)
{
if (mnCurrent + 1 > mnEnd )
rInt8 = 0;
else
rInt8 = mpBuffer [mnCurrent++] & 0xFF;
return *this;
}
MemoryByteGrabber& operator >> (sal_Int16& rInt16)
{
if (mnCurrent + 2 > mnEnd )
rInt16 = 0;
else
{
rInt16 = mpBuffer[mnCurrent++] & 0xFF;
rInt16 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
}
return *this;
}
MemoryByteGrabber& operator >> (sal_Int32& rInt32)
{
if (mnCurrent + 4 > mnEnd )
rInt32 = 0;
else
{
rInt32 = mpBuffer[mnCurrent++] & 0xFF;
rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 8;
rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 16;
rInt32 |= ( mpBuffer[mnCurrent++] & 0xFF ) << 24;
}
return *this;
}
MemoryByteGrabber& operator >> (sal_uInt8& rInt8)
{
if (mnCurrent + 1 > mnEnd )
rInt8 = 0;
else
rInt8 = mpBuffer [mnCurrent++] & 0xFF;
return *this;
}
MemoryByteGrabber& operator >> (sal_uInt16& rInt16)
{
if (mnCurrent + 2 > mnEnd )
rInt16 = 0;
else
{
rInt16 = mpBuffer [mnCurrent++] & 0xFF;
rInt16 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
}
return *this;
}
MemoryByteGrabber& operator >> (sal_uInt32& rInt32)
{
if (mnCurrent + 4 > mnEnd )
rInt32 = 0;
else
{
rInt32 = mpBuffer [mnCurrent++] & 0xFF;
rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 8;
rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 16;
rInt32 |= ( mpBuffer [mnCurrent++] & 0xFF ) << 24;
}
return *this;
}
};
#endif
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