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


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_xmlhelp.hxx"
#include <rtl/memory.h>
#include "bufferedinputstream.hxx"


using namespace cppu;
using namespace com::sun::star::uno;
using namespace com::sun::star::lang;
using namespace com::sun::star::io;
using namespace chelp;


Reference<XInputStream> chelp::turnToSeekable(const Reference<XInputStream>& xInputStream)
{
	if( ! xInputStream.is() )
		return xInputStream;
	
	Reference<XSeekable> xSeekable(xInputStream,UNO_QUERY);
	
	if( xSeekable.is() )
		return xInputStream;
	
	return new BufferedInputStream(xInputStream);
}


BufferedInputStream::BufferedInputStream(const Reference<XInputStream>& xInputStream)
	: m_nBufferLocation(0),
	  m_nBufferSize(0),
	  m_pBuffer(new sal_Int8[1]) // Initialize with one to avoid gcc compiler warnings
{
	try
	{
		sal_Int32 num;
		sal_Int8  *tmp;
		Sequence< sal_Int8 > aData(4096);
		do{
			num = xInputStream->readBytes(aData,4096);
			if( num > 0 )
			{
				tmp = m_pBuffer;
				m_pBuffer = new sal_Int8[m_nBufferSize+num];
				rtl_copyMemory((void *)(m_pBuffer),
							   (void *)(tmp),
							   sal_uInt32(m_nBufferSize));
				rtl_copyMemory((void *)(m_pBuffer+m_nBufferSize),
							   (void *)(aData.getArray()),
							   sal_uInt32(num));
				m_nBufferSize += num;
				delete[] tmp;
			}
		} while( num == 4096 );
	}
	catch( const NotConnectedException&)
	{
	}
	catch( const BufferSizeExceededException&)
	{		
	}
	catch( const IOException&)
	{
	}
	catch( const RuntimeException&)
	{
	}
	xInputStream->closeInput();
}


BufferedInputStream::~BufferedInputStream()
{
	delete[] m_pBuffer;
}


Any SAL_CALL BufferedInputStream::queryInterface( const Type& rType ) throw( RuntimeException )
{
	Any aRet = ::cppu::queryInterface( rType,
									   SAL_STATIC_CAST( XInputStream*,this ),
									   SAL_STATIC_CAST( XSeekable*,this ) );
	
	return aRet.hasValue() ? aRet : OWeakObject::queryInterface( rType );
}


void SAL_CALL BufferedInputStream::acquire( void ) throw()
{
	OWeakObject::acquire();
}


void SAL_CALL BufferedInputStream::release( void ) throw()
{
	OWeakObject::release();
}


sal_Int32 SAL_CALL BufferedInputStream::readBytes( Sequence< sal_Int8 >& aData,sal_Int32 nBytesToRead )
	throw( NotConnectedException,
		   BufferSizeExceededException,
		   IOException,
		   RuntimeException)
{
	osl::MutexGuard aGuard( m_aMutex );
	
	if( 0 > nBytesToRead )
		throw BufferSizeExceededException();
	
	if( m_nBufferLocation + nBytesToRead > m_nBufferSize )
		nBytesToRead = m_nBufferSize - m_nBufferLocation;
	
	if( aData.getLength() < nBytesToRead )
		aData.realloc(nBytesToRead);
	
	rtl_copyMemory((void*)(aData.getArray()),
				   (void*)(m_pBuffer+m_nBufferLocation),
				   nBytesToRead);

	return nBytesToRead;
}


sal_Int32 SAL_CALL BufferedInputStream::readSomeBytes(
	Sequence< sal_Int8 >& aData,sal_Int32 nMaxBytesToRead )
	throw( NotConnectedException,
		   BufferSizeExceededException,
		   IOException,
		   RuntimeException)
{
	return readBytes(aData,nMaxBytesToRead);
}


void SAL_CALL BufferedInputStream::skipBytes( sal_Int32 nBytesToSkip )
	throw( NotConnectedException,
		   BufferSizeExceededException,
		   IOException,
		   RuntimeException )
{
	try
	{
		seek(m_nBufferLocation+nBytesToSkip);
	}
	catch( const IllegalArgumentException& )
	{
		throw BufferSizeExceededException();
	}
}


sal_Int32 SAL_CALL BufferedInputStream::available( void )
	throw( NotConnectedException,
		   IOException,
		   RuntimeException )
{
	osl::MutexGuard aGuard( m_aMutex );
	return  m_nBufferSize-m_nBufferLocation;
}


void SAL_CALL BufferedInputStream::closeInput( void )
	throw( NotConnectedException,
		   IOException,
		   RuntimeException )
{
}


void SAL_CALL BufferedInputStream::seek( sal_Int64 location )
	throw( IllegalArgumentException,
		   IOException,
		   RuntimeException )
{
	if( 0 <= location && location < m_nBufferSize )
	{
		osl::MutexGuard aGuard( m_aMutex );
		m_nBufferLocation = sal::static_int_cast<sal_Int32>( location );
	}
	else
		throw IllegalArgumentException();
}


sal_Int64 SAL_CALL BufferedInputStream::getPosition( void )
	throw( IOException,
		   RuntimeException )
{
	osl::MutexGuard aGuard( m_aMutex );
	return m_nBufferLocation;
}


sal_Int64 SAL_CALL BufferedInputStream::getLength( void ) throw( IOException,RuntimeException )
{
	osl::MutexGuard aGuard( m_aMutex );
	return m_nBufferSize;
}