AOO410/main/package/source/zipapi/ByteGrabber.cxx

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 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_package.hxx"
#include <ByteGrabber.hxx>
#include <com/sun/star/io/XSeekable.hpp>
#include <com/sun/star/io/XInputStream.hpp>

using namespace ::com::sun::star;

/** ByteGrabber implements the >> operators on an XOutputStream. This is
 *  potentially quite slow and may need to be optimised
 */

ByteGrabber::ByteGrabber(uno::Reference  < io::XInputStream > xIstream)
: xStream(xIstream) 
, xSeek (xIstream, uno::UNO_QUERY )
, aSequence ( 4 )
{
	pSequence = aSequence.getArray();
}

ByteGrabber::~ByteGrabber()
{
}

void ByteGrabber::setInputStream (uno::Reference < io::XInputStream > xNewStream)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	xStream = xNewStream;
	xSeek = uno::Reference < io::XSeekable > (xNewStream, uno::UNO_QUERY);
}

// XInputStream chained
sal_Int32 SAL_CALL ByteGrabber::readBytes( uno::Sequence< sal_Int8 >& aData, 
										sal_Int32 nBytesToRead ) 
	throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, uno::RuntimeException)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	return xStream->readBytes(aData, nBytesToRead );
}

// XSeekable chained...
sal_Int64 SAL_CALL ByteGrabber::seek( sal_Int64 location ) 
	throw(lang::IllegalArgumentException, io::IOException, uno::RuntimeException)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	if (xSeek.is() )
	{
		sal_Int64 nLen = xSeek->getLength();
		if ( location < 0 || location > nLen )
			throw lang::IllegalArgumentException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( OSL_LOG_PREFIX ) ), uno::Reference< uno::XInterface >(), 1 );
		if (location > nLen )
			location = nLen;
		xSeek->seek( location );
		return location;
	}		
	else
		throw io::IOException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( OSL_LOG_PREFIX ) ), uno::Reference< uno::XInterface >() );
}

sal_Int64 SAL_CALL ByteGrabber::getPosition(  ) 
		throw(io::IOException, uno::RuntimeException)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	if (xSeek.is() )
		return xSeek->getPosition();
	else
		throw io::IOException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( OSL_LOG_PREFIX ) ), uno::Reference< uno::XInterface >() );
}

sal_Int64 SAL_CALL ByteGrabber::getLength(  )
		throw(io::IOException, uno::RuntimeException)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	if (xSeek.is() )
		return xSeek->getLength();
	else
		throw io::IOException( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( OSL_LOG_PREFIX ) ), uno::Reference< uno::XInterface >() );
}

ByteGrabber& ByteGrabber::operator >> (sal_Int8& rInt8)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	if (xStream->readBytes(aSequence,1) != 1)
		rInt8 = 0;
	else
		rInt8 = aSequence[0] & 0xFF;
	return *this;
}

ByteGrabber& ByteGrabber::operator >> (sal_Int16& rInt16)
{
    ::osl::MutexGuard aGuard( m_aMutex );
	if (xStream->readBytes ( aSequence, 2) != 2)
		rInt16 = 0;
	else
	{
		pSequence = aSequence.getConstArray();
		rInt16 = static_cast <sal_Int16> 
			   ( (pSequence[0] & 0xFF) 
		      | (pSequence[1] & 0xFF) << 8);
	}
	return *this;
}

ByteGrabber& ByteGrabber::operator >> (sal_Int32& rInt32)
{
    ::osl::MutexGuard aGuard( m_aMutex );

	if (xStream->readBytes(aSequence, 4) != 4)
		rInt32 = 0;
	else
	{
		pSequence = aSequence.getConstArray();
		rInt32 = static_cast < sal_Int32 > 
			    ( (pSequence[0] & 0xFF)
		      | ( pSequence[1] & 0xFF ) << 8 
		      | ( pSequence[2] & 0xFF ) << 16
		      | ( pSequence[3] & 0xFF ) << 24 );
	}
	return *this;
}

ByteGrabber& ByteGrabber::operator >> (sal_uInt8& rInt8)
{
    ::osl::MutexGuard aGuard( m_aMutex );

	if (xStream->readBytes(aSequence,1) != 1)
		rInt8 = 0;
	else
		rInt8 = static_cast < sal_uInt8 > (aSequence[0] & 0xFF );
	return *this;
}
ByteGrabber& ByteGrabber::operator >> (sal_uInt16& rInt16)
{
    ::osl::MutexGuard aGuard( m_aMutex );

	if (xStream->readBytes(aSequence, 2) != 2)
		rInt16 = 0;
	else
	{
		pSequence = aSequence.getConstArray();
		rInt16 = static_cast <sal_uInt16> 
			   ( (pSequence[0] & 0xFF) 
		      | (pSequence[1] & 0xFF) << 8);
	}
	return *this;
}
ByteGrabber& ByteGrabber::operator >> (sal_uInt32& ruInt32)
{
    ::osl::MutexGuard aGuard( m_aMutex );

	if (xStream->readBytes(aSequence, 4) != 4)
		ruInt32 = 0;
	else
	{
		pSequence = aSequence.getConstArray();
		ruInt32 = static_cast < sal_uInt32 > 
			    ( (pSequence[0] & 0xFF)
		      | ( pSequence[1] & 0xFF ) << 8 
		      | ( pSequence[2] & 0xFF ) << 16
		      | ( pSequence[3] & 0xFF ) << 24 );
	}
	return *this;
}