office-gobmx/package/source/zipapi/XFileStream.cxx

/*************************************************************************
 *
 *  $RCSfile: XFileStream.cxx,v $
 *
 *  $Revision: 1.4 $
 *
 *  last change: $Author: mtg $ $Date: 2001-09-14 14:57:00 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (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.openoffice.org/license.html.
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
 *
 *  Copyright: 2000 by Sun Microsystems, Inc.
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): Martin Gallwey (gallwey@sun.com)
 *
 *
 ************************************************************************/
#ifndef _XFILE_STREAM_HXX
#include <XFileStream.hxx>
#endif
#ifndef _ENCRYPTION_DATA_HXX_
#include <EncryptionData.hxx>
#endif
#ifndef _COM_SUN_STAR_PACKAGES_ZIP_ZIPCONSTANTS_HPP_
#include <com/sun/star/packages/zip/ZipConstants.hpp>
#endif
#ifndef _PACKAGE_CONSTANTS_HXX_
#include <PackageConstants.hxx>
#endif
#ifndef _RTL_CIPHER_H_
#include <rtl/cipher.h>
#endif
#ifndef _ZIP_FILE_HXX
#include <ZipFile.hxx>
#endif

using namespace com::sun::star::packages::zip::ZipConstants;
using namespace com::sun::star::io;
using namespace com::sun::star::uno;
using com::sun::star::lang::IllegalArgumentException;
using ::rtl::OUString;

XFileStream::XFileStream( ZipEntry & rEntry,
                           com::sun::star::uno::Reference < com::sun::star::io::XInputStream > xNewZipStream,
                           com::sun::star::uno::Reference < com::sun::star::io::XInputStream > xNewTempStream,
                           const vos::ORef < EncryptionData > &rData,
                           sal_Bool bNewRawStream )
: maEntry ( rEntry )
, mxData ( rData )
, mbRawStream ( bNewRawStream )
, mbFinished ( sal_False )
, mxTempIn ( xNewTempStream )
, mxTempSeek ( xNewTempStream, UNO_QUERY )
, mxTempOut ( xNewTempStream, UNO_QUERY )
, mxZipStream ( xNewZipStream )
, mxZipSeek ( xNewZipStream, UNO_QUERY )
, maInflater ( sal_True )
, maCipher ( NULL )
{
    mnZipCurrent = maEntry.nOffset;
    if (mbRawStream)
    {
        mnZipSize = maEntry.nMethod == DEFLATED ? maEntry.nCompressedSize : maEntry.nSize;
        mnZipEnd = maEntry.nOffset + mnZipSize;
    }
    else
    {
        mnZipSize = maEntry.nSize;
        mnZipEnd = maEntry.nMethod == DEFLATED ? maEntry.nOffset + maEntry.nCompressedSize : maEntry.nOffset + maEntry.nSize;
    }
    if ( !rData.isEmpty() && rData->aSalt.getLength() )
        ZipFile::StaticGetCipher ( rData, maCipher );
}

XFileStream::~XFileStream()
{
    if ( maCipher )
        rtl_cipher_destroy ( maCipher );
}

Any SAL_CALL  XFileStream::queryInterface( const Type& rType )
        throw(RuntimeException)
{
    return ::cppu::queryInterface ( rType                                       ,
                                        // OWeakObject interfaces
                                        reinterpret_cast< XInterface*       > ( this )  ,
                                        static_cast< XWeak*         > ( this )  ,
                                        // my interfaces
                                        static_cast< XInputStream*      > ( this )  ,
                                        static_cast< XSeekable*     > ( this ) );

}

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

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

void XFileStream::fill( sal_Int64 nUntil)
{
    sal_Int32 nRead;
    sal_Int64 nPosition = mxTempSeek->getPosition();
    mxTempSeek->seek ( mxTempSeek->getLength() );
    maBuffer.realloc ( n_ConstBufferSize );

    while ( mxTempSeek->getLength() < nUntil )
    {
        if ( !mbRawStream )
        {
            while ( 0 == ( nRead = maInflater.doInflate( maBuffer ) ) )
            {
                if ( maInflater.finished() || maInflater.needsDictionary() )
                {
                    // some error handling ?
                    return;
                }

                sal_Int64 nDiff = mnZipEnd - mnZipCurrent;
                if ( nDiff >= 0 )
                {
                    mxZipSeek->seek ( mnZipCurrent );
                    nRead = mxZipStream->readBytes ( maCompBuffer, static_cast < sal_Int32 > ( nDiff < n_ConstBufferSize ? nDiff : n_ConstBufferSize ) );
                    mnZipCurrent += nRead;
                    // maCompBuffer now has the uncompressed data, check if we need to decrypt
                    // before passing to the Inflater
                    if ( maCipher )
                    {
                        Sequence < sal_Int8 > aCryptBuffer ( nRead );
                        rtlCipherError aResult = rtl_cipher_decode ( maCipher,
                                      maCompBuffer.getConstArray(),
                                      nRead,
                                      reinterpret_cast < sal_uInt8 * > (aCryptBuffer.getArray()),
                                      nRead);
                        OSL_ASSERT (aResult == rtl_Cipher_E_None);
                        maCompBuffer = aCryptBuffer; // Now it holds the decrypted data

                    }
                    maInflater.setInput ( maCompBuffer );
                }
                else
                {
                    // some error handling ?
                    return;
                }
            }
        }
        else
        {
            sal_Int64 nDiff = mnZipEnd - mnZipCurrent;
            mxZipSeek->seek ( mnZipCurrent );
            nRead = mxZipStream->readBytes ( maBuffer, static_cast < sal_Int32 > ( nDiff < n_ConstBufferSize ? nDiff : n_ConstBufferSize ) );
            mnZipCurrent += nRead;
        }
        Sequence < sal_Int8 > aTmpBuffer ( maBuffer.getConstArray(), nRead );
        mxTempOut->writeBytes ( aTmpBuffer );
    }
    mxTempSeek->seek ( nPosition );
}

sal_Int32 SAL_CALL XFileStream::readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
        throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
{
    sal_Int64 nPosition = mxTempSeek->getPosition();
    if ( nPosition + nBytesToRead > mnZipSize )
        nBytesToRead = static_cast < sal_Int32 > ( mnZipSize - nPosition );

    sal_Int64 nUntil = nBytesToRead + nPosition + n_ConstBufferSize;
    if (nUntil > mnZipSize )
        nUntil = mnZipSize;
    if ( nUntil > mxTempSeek->getLength() )
        fill ( nUntil );
    sal_Int32 nRead = mxTempIn->readBytes ( aData, nBytesToRead );
    return nRead;
}

sal_Int32 SAL_CALL XFileStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
        throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
{
    return readBytes ( aData, nMaxBytesToRead );
}
void SAL_CALL XFileStream::skipBytes( sal_Int32 nBytesToSkip )
        throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
{
    seek ( mxTempSeek->getPosition() + nBytesToSkip );
}

sal_Int32 SAL_CALL XFileStream::available(  )
        throw( NotConnectedException, IOException, RuntimeException)
{
    return static_cast < sal_Int32 > ( mnZipSize - mxTempSeek->getPosition() );
}

void SAL_CALL XFileStream::closeInput(  )
        throw( NotConnectedException, IOException, RuntimeException)
{
}
void SAL_CALL XFileStream::seek( sal_Int64 location )
        throw( IllegalArgumentException, IOException, RuntimeException)
{
    if ( location > mnZipSize || location < 0 )
        throw IllegalArgumentException();
    if ( location > mxTempSeek->getLength() )
    {
        sal_Int64 nUntil = location + n_ConstBufferSize > mnZipSize ? mnZipSize : location + n_ConstBufferSize;
        fill ( nUntil );
    }
    mxTempSeek->seek ( location );
}
sal_Int64 SAL_CALL XFileStream::getPosition(  )
        throw(IOException, RuntimeException)
{
    return mxTempSeek->getPosition();
}
sal_Int64 SAL_CALL XFileStream::getLength(  )
        throw(IOException, RuntimeException)
{
    return mnZipSize;
}