/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/



#include <cppuhelper/weak.hxx>
#include <osl/mutex.hxx>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XSeekable.hpp>


namespace chelp {
	
	class BufferedInputStream
		: public cppu::OWeakObject,
		  public com::sun::star::io::XInputStream,
		  public com::sun::star::io::XSeekable
	{
	private:
		
		sal_Int32      m_nBufferLocation;
		sal_Int32      m_nBufferSize;
		sal_Int8      *m_pBuffer;
		osl::Mutex     m_aMutex;
		
	public:
		
		BufferedInputStream(
			const com::sun::star::uno::Reference<com::sun::star::io::XInputStream>& xInputStream);
		
		~BufferedInputStream();
		
		virtual com::sun::star::uno::Any SAL_CALL 
		queryInterface( const com::sun::star::uno::Type& rType )
			throw( com::sun::star::uno::RuntimeException );
		
		virtual void SAL_CALL acquire( void ) throw();
		
		virtual void SAL_CALL release( void ) throw();
		
		
		virtual 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 );
		
		virtual 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 );
		
		virtual 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 );
		
		virtual sal_Int32 SAL_CALL available( void )
			throw( com::sun::star::io::NotConnectedException,
				   com::sun::star::io::IOException,
				   com::sun::star::uno::RuntimeException );
		
		virtual void SAL_CALL closeInput( void )
			throw( com::sun::star::io::NotConnectedException,
				   com::sun::star::io::IOException,
				   com::sun::star::uno::RuntimeException );
		
		virtual void SAL_CALL seek( sal_Int64 location )
			throw( com::sun::star::lang::IllegalArgumentException,
				   com::sun::star::io::IOException,
				   com::sun::star::uno::RuntimeException );
		
		virtual sal_Int64 SAL_CALL getPosition( void )
			throw( com::sun::star::io::IOException,
				   com::sun::star::uno::RuntimeException );
		
		virtual sal_Int64 SAL_CALL getLength( void )
			throw( com::sun::star::io::IOException,
				   com::sun::star::uno::RuntimeException );
	};
	
	
	extern com::sun::star::uno::Reference<com::sun::star::io::XInputStream>
	turnToSeekable(
		const com::sun::star::uno::Reference<com::sun::star::io::XInputStream>& xInputStream);
	
}