/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   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 .

 */

#include <sal/config.h>

#include <com/sun/star/io/IOException.hpp>

#include <com/sun/star/lang/IllegalArgumentException.hpp>

#include <osl/diagnose.h>

#include "filinpstr.hxx"

#include "filerror.hxx"

using namespace fileaccess;

using namespace com::sun::star;

#if OSL_DEBUG_LEVEL > 0

#define THROW_WHERE SAL_WHERE

#else

#define THROW_WHERE ""

#endif

XInputStream_impl::XInputStream_impl( const OUString& aUncPath, bool bLock )

    : m_aFile( aUncPath ),

      m_nErrorCode( TaskHandlerErr::NO_ERROR ),

      m_nMinorErrorCode( 0 )

{

    sal_uInt32 nFlags = osl_File_OpenFlag_Read;

    if ( !bLock )

        nFlags |= osl_File_OpenFlag_NoLock;

    osl::FileBase::RC err = m_aFile.open( nFlags );

    if( err != osl::FileBase::E_None )

    {

        m_nIsOpen = false;

        m_aFile.close();

        m_nErrorCode = TaskHandlerErr::OPEN_FOR_INPUTSTREAM;

        m_nMinorErrorCode = err;

    }

    else

        m_nIsOpen = true;

}

XInputStream_impl::~XInputStream_impl()

{

    try

    {

        closeInput();

    }

    catch (io::IOException const &)

    {

        OSL_FAIL("unexpected situation");

    }

    catch (uno::RuntimeException const &)

    {

        OSL_FAIL("unexpected situation");

    }

}

sal_Int32 SAL_CALL

XInputStream_impl::readBytes(

                 uno::Sequence< sal_Int8 >& aData,

                 sal_Int32 nBytesToRead )

{

    if( ! m_nIsOpen ) throw io::IOException( THROW_WHERE );

    aData.realloc(nBytesToRead);

        //TODO! translate memory exhaustion (if it were detectable...) into

        // io::BufferSizeExceededException

    sal_uInt64 nrc(0);

    if(m_aFile.read( aData.getArray(),sal_uInt64(nBytesToRead),nrc )

       != osl::FileBase::E_None)

        throw io::IOException( THROW_WHERE );

    // 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 (sal::static_int_cast<sal_Int32>(nrc) != nBytesToRead)

        aData.realloc(sal_Int32(nrc));

    return static_cast<sal_Int32>(nrc);

}

sal_Int32

XInputStream_impl::readSomeBytes(

                 sal_Int8* aData,

                 sal_Int32 nBytesToRead )

{

    if( ! m_nIsOpen ) throw io::IOException( THROW_WHERE );

        //TODO! translate memory exhaustion (if it were detectable...) into

        // io::BufferSizeExceededException

    sal_uInt64 nrc(0);

    if(m_aFile.read( aData, sal_uInt64(nBytesToRead),nrc )

       != osl::FileBase::E_None)

        throw io::IOException( THROW_WHERE );

    return static_cast<sal_Int32>(nrc);

}

sal_Int32 SAL_CALL

XInputStream_impl::readSomeBytes(

    uno::Sequence< sal_Int8 >& aData,

    sal_Int32 nMaxBytesToRead )

{

    return readBytes( aData,nMaxBytesToRead );

}

void SAL_CALL

XInputStream_impl::skipBytes( sal_Int32 nBytesToSkip )

{

    m_aFile.setPos( osl_Pos_Current, sal_uInt64( nBytesToSkip ) );

}

sal_Int32 SAL_CALL

XInputStream_impl::available()

{

    sal_Int64 avail = getLength() - getPosition();

    return std::min<sal_Int64>(avail, SAL_MAX_INT32);

}

void SAL_CALL

XInputStream_impl::closeInput()

{

    if( m_nIsOpen )

    {

        osl::FileBase::RC err = m_aFile.close();

        if( err != osl::FileBase::E_None )

            throw io::IOException( THROW_WHERE );

        m_nIsOpen = false;

    }

}

void SAL_CALL

XInputStream_impl::seek( sal_Int64 location )

{

    if( location < 0 )

        throw lang::IllegalArgumentException( THROW_WHERE, uno::Reference< uno::XInterface >(), 0 );

    if( osl::FileBase::E_None != m_aFile.setPos( osl_Pos_Absolut, sal_uInt64( location ) ) )

        throw io::IOException( THROW_WHERE );

}

sal_Int64 SAL_CALL

XInputStream_impl::getPosition()

{

    sal_uInt64 uPos;

    if( osl::FileBase::E_None != m_aFile.getPos( uPos ) )

        throw io::IOException( THROW_WHERE );

    return sal_Int64( uPos );

}

sal_Int64 SAL_CALL

XInputStream_impl::getLength()

{

    sal_uInt64 uEndPos;

    if ( m_aFile.getSize(uEndPos) != osl::FileBase::E_None )

        throw io::IOException( THROW_WHERE );

    return sal_Int64( uEndPos );

}

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