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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: EntryInputStream.cxx,v $
* $Revision: 1.22 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_package.hxx"
#include <EntryInputStream.hxx>
#include <com/sun/star/packages/zip/ZipConstants.hpp>
#include <rtl/cipher.h>
#include <rtl/digest.h>
#include <memory.h> // for memcpy
using namespace rtl;
using namespace com::sun::star;
using namespace com::sun::star::uno;
using namespace com::sun::star::packages::zip;
using namespace com::sun::star::packages::zip::ZipConstants;
/** Provides access to the compressed data in a zipfile.
*
* 04/12/00 - uncompresses the stream into memory and seeks on it 'in memory'
* This and the ZipPackageBuffer used in the ZipOutputStream are memory hogs
* and will hopefully be replaced eventually
*
* Acts on the same underlying XInputStream as both the full Zip File and other
* EntryInputStreams, and thus must maintain its current position in the stream and
* seek to it before performing any reads.
*/
EntryInputStream::EntryInputStream( Reference < io::XInputStream > xNewInput,
const ZipEntry & rNewEntry,
const vos::ORef < EncryptionData > &xEncryptData,
sal_Bool bGetRawStream)
: xStream( xNewInput )
, xSeek( xNewInput, UNO_QUERY )
, aEntry (rNewEntry )
, nCurrent( 0 )
, bHaveInMemory ( sal_False )
, aInflater( sal_True )
, aBuffer( 0 )
, xEncryptionData (xEncryptData)
, bRawStream (bGetRawStream)
{
if (bGetRawStream)
{
nUncompressedSize = aEntry.nMethod == DEFLATED ? aEntry.nCompressedSize : aEntry.nSize;
nEnd = aEntry.nOffset + nUncompressedSize;
}
else
{
nEnd = aEntry.nMethod == DEFLATED ? aEntry.nOffset + aEntry.nCompressedSize : aEntry.nOffset + aEntry.nSize;
nUncompressedSize = aEntry.nSize;
}
}
void EntryInputStream::readIntoMemory()
throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
{
if (!bHaveInMemory)
{
Sequence < sal_Int8 > aReadBuffer;
xSeek->seek(aEntry.nOffset);
sal_Int32 nSize = aEntry.nMethod == DEFLATED ? aEntry.nCompressedSize : aEntry.nSize;
if (nSize <0)
throw io::BufferSizeExceededException(::rtl::OUString(), *this);
xStream->readBytes( aReadBuffer, nSize ); // Now it holds the raw stuff from disk
if (xEncryptionData->aSalt.getLength())
{
// Have salt, will travel
Sequence < sal_uInt8 > aDerivedKey (16);
rtlCipherError aResult;
Sequence < sal_Int8 > aDecryptBuffer;
// Get the key
rtl_digest_PBKDF2 ( aDerivedKey.getArray(), 16,
reinterpret_cast < const sal_uInt8 * > (xEncryptionData->aKey.getConstArray()),
xEncryptionData->aKey.getLength(),
xEncryptionData->aSalt.getConstArray(),
xEncryptionData->aSalt.getLength(),
xEncryptionData->nIterationCount );
rtlCipher aCipher = rtl_cipher_create (rtl_Cipher_AlgorithmBF, rtl_Cipher_ModeStream);
aResult = rtl_cipher_init( aCipher, rtl_Cipher_DirectionDecode,
aDerivedKey.getConstArray(),
aDerivedKey.getLength(),
xEncryptionData->aInitVector.getConstArray(),
xEncryptionData->aInitVector.getLength());
OSL_ASSERT (aResult == rtl_Cipher_E_None);
aDecryptBuffer.realloc ( nSize );
aResult = rtl_cipher_decode ( aCipher,
aReadBuffer.getConstArray(),
nSize,
reinterpret_cast < sal_uInt8 * > (aDecryptBuffer.getArray()),
nSize);
OSL_ASSERT (aResult == rtl_Cipher_E_None);
aReadBuffer = aDecryptBuffer; // Now it holds the decrypted data
}
if (bRawStream || aEntry.nMethod == STORED)
aBuffer = aReadBuffer; // bRawStream means the caller doesn't want it decompressed
else
{
aInflater.setInputSegment(aReadBuffer, 0, nSize );
aBuffer.realloc( aEntry.nSize );
aInflater.doInflate(aBuffer);
aInflater.end();
}
bHaveInMemory = sal_True;
}
}
EntryInputStream::~EntryInputStream( void )
{
}
sal_Int32 SAL_CALL EntryInputStream::readBytes( Sequence< sal_Int8 >& aData,
sal_Int32 nBytesToRead )
throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
{
if (nBytesToRead <0)
throw io::BufferSizeExceededException(::rtl::OUString(), *this);
if (!bHaveInMemory)
readIntoMemory();
if (nBytesToRead + nCurrent > nUncompressedSize)
nBytesToRead = static_cast < sal_Int32> ( nUncompressedSize - nCurrent );
aData.realloc( nBytesToRead );
memcpy(aData.getArray(), aBuffer.getConstArray() + nCurrent, nBytesToRead);
nCurrent+=nBytesToRead;
return nBytesToRead;
}
sal_Int32 SAL_CALL EntryInputStream::readSomeBytes( Sequence< sal_Int8 >& aData,
sal_Int32 nMaxBytesToRead )
throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
{
return readBytes( aData, nMaxBytesToRead );
}
void SAL_CALL EntryInputStream::skipBytes( sal_Int32 nBytesToSkip )
throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
{
if (nBytesToSkip < 0)
throw io::BufferSizeExceededException(::rtl::OUString(), *this);
if (nBytesToSkip + nCurrent > nUncompressedSize)
nBytesToSkip = static_cast < sal_Int32 > (nUncompressedSize- nCurrent);
nCurrent+=nBytesToSkip;
}
sal_Int32 SAL_CALL EntryInputStream::available( )
throw(io::NotConnectedException, io::IOException, RuntimeException)
{
return static_cast < sal_Int32 > (nUncompressedSize - nCurrent);
}
void SAL_CALL EntryInputStream::closeInput( )
throw(io::NotConnectedException, io::IOException, RuntimeException)
{
}
void SAL_CALL EntryInputStream::seek( sal_Int64 location )
throw(lang::IllegalArgumentException, io::IOException, RuntimeException)
{
if (location > nUncompressedSize)
location = nUncompressedSize;
if (location <0)
location = 0;
nCurrent = location;
}
sal_Int64 SAL_CALL EntryInputStream::getPosition( )
throw(io::IOException, RuntimeException)
{
return nCurrent;
}
sal_Int64 SAL_CALL EntryInputStream::getLength( )
throw(io::IOException, RuntimeException)
{
return nUncompressedSize;
}
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