/**************************************************************
 * 
 * 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 "inputstream.hxx"


using namespace chelp;
using namespace com::sun::star;
using namespace com::sun::star::ucb;



XInputStream_impl::XInputStream_impl( const rtl::OUString& aUncPath )
    : m_bIsOpen( false ),
      m_aFile( aUncPath )
{
	m_bIsOpen = ( osl::FileBase::E_None == m_aFile.open( OpenFlag_Read ) );
}


XInputStream_impl::~XInputStream_impl()
{
	closeInput();
}


bool SAL_CALL XInputStream_impl::CtorSuccess()
{
	return m_bIsOpen;
};


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


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


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



sal_Int32 SAL_CALL
XInputStream_impl::readBytes(
			     uno::Sequence< sal_Int8 >& aData,
			     sal_Int32 nBytesToRead )
	throw( io::NotConnectedException,
		   io::BufferSizeExceededException,
		   io::IOException,
		   uno::RuntimeException)
{
	if( ! m_bIsOpen )
        throw io::IOException();
    
    aData.realloc(nBytesToRead);
    //TODO! translate memory exhaustion (if it were detectable...) into
    // io::BufferSizeExceededException
    
	sal_uInt64 nrc;
	m_aFile.read( aData.getArray(),sal_uInt64(nBytesToRead),nrc );

    // Shrink aData in case we read less than nBytesToRead (XInputStream
    // documentation does not tell whether this is required, and I do not know
    // if any code relies on this, so be conservative---SB):
    if (nrc != sal::static_int_cast<sal_uInt64>( nBytesToRead) )
        aData.realloc(sal_Int32(nrc));
	return ( sal_Int32 ) nrc;
}

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


void SAL_CALL
XInputStream_impl::skipBytes(
	sal_Int32 nBytesToSkip )
	throw( io::NotConnectedException,
		   io::BufferSizeExceededException,
		   io::IOException,
		   uno::RuntimeException)
{
	m_aFile.setPos( osl_Pos_Current, sal_uInt64( nBytesToSkip ) );
}


sal_Int32 SAL_CALL
XInputStream_impl::available(
	void )
	throw( io::NotConnectedException,
		   io::IOException,
		   uno::RuntimeException)
{
	return 0;
}


void SAL_CALL
XInputStream_impl::closeInput(
	void )
	throw( io::NotConnectedException,
		   io::IOException,
		   uno::RuntimeException )
{
	if( m_bIsOpen )
	{
		osl::FileBase::RC err = m_aFile.close();
		if( err != osl::FileBase::E_None )
			throw io::IOException();
		m_bIsOpen = false;
	}
}


void SAL_CALL
XInputStream_impl::seek(
	sal_Int64 location )
	throw( lang::IllegalArgumentException,
		   io::IOException,
		   uno::RuntimeException )
{
	if( location < 0 )
		throw lang::IllegalArgumentException();
	if( osl::FileBase::E_None != m_aFile.setPos( Pos_Absolut, sal_uInt64( location ) ) )
		throw io::IOException();
}


sal_Int64 SAL_CALL
XInputStream_impl::getPosition(
	void )
	throw( io::IOException,
		   uno::RuntimeException )
{
	sal_uInt64 uPos;
	if( osl::FileBase::E_None != m_aFile.getPos( uPos ) )
		throw io::IOException();
	return sal_Int64( uPos );
}

sal_Int64 SAL_CALL
XInputStream_impl::getLength(
	void )
	throw( io::IOException,
		   uno::RuntimeException )
{
	osl::FileBase::RC	err;
	sal_uInt64			uCurrentPos, uEndPos;

	err = m_aFile.getPos( uCurrentPos );
	if( err != osl::FileBase::E_None )
		throw io::IOException();

	err = m_aFile.setPos( Pos_End, 0 );
	if( err != osl::FileBase::E_None )
		throw io::IOException();

	err = m_aFile.getPos( uEndPos );
	if( err != osl::FileBase::E_None )
		throw io::IOException();

	err = m_aFile.setPos( Pos_Absolut, uCurrentPos );
	if( err != osl::FileBase::E_None )
		throw io::IOException();
	else
		return sal_Int64( uEndPos );
}