240 lines
9.2 KiB
C++
240 lines
9.2 KiB
C++
/*************************************************************************
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*
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* $RCSfile: EntryInputStream.cxx,v $
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*
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* $Revision: 1.19 $
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*
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* last change: $Author: hr $ $Date: 2003-03-26 14:13:44 $
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*
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* The Contents of this file are made available subject to the terms of
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* either of the following licenses
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*
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* - GNU Lesser General Public License Version 2.1
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* - Sun Industry Standards Source License Version 1.1
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*
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* Sun Microsystems Inc., October, 2000
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2000 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*
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* Sun Industry Standards Source License Version 1.1
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* =================================================
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* The contents of this file are subject to the Sun Industry Standards
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* Source License Version 1.1 (the "License"); You may not use this file
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* except in compliance with the License. You may obtain a copy of the
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* License at http://www.openoffice.org/license.html.
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*
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* Software provided under this License is provided on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
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* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
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* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
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* See the License for the specific provisions governing your rights and
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* obligations concerning the Software.
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*
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* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
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*
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* Copyright: 2000 by Sun Microsystems, Inc.
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*
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* All Rights Reserved.
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*
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* Contributor(s): Martin Gallwey (gallwey@sun.com)
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*
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*
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************************************************************************/
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#ifndef _ENTRY_INPUT_STREAM_HXX
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#include <EntryInputStream.hxx>
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#endif
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#ifndef _COM_SUN_STAR_PACKAGES_ZIP_ZIPCONSTANTS_HPP_
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#include <com/sun/star/packages/zip/ZipConstants.hpp>
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#endif
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#ifndef _RTL_CIPHER_H_
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#include <rtl/cipher.h>
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#endif
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#ifndef _RTL_DIGEST_H_
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#include <rtl/digest.h>
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#endif
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#include <memory.h> // for memcpy
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using namespace rtl;
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using namespace com::sun::star;
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using namespace com::sun::star::uno;
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using namespace com::sun::star::packages::zip;
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using namespace com::sun::star::packages::zip::ZipConstants;
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/** Provides access to the compressed data in a zipfile.
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*
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* 04/12/00 - uncompresses the stream into memory and seeks on it 'in memory'
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* This and the ZipPackageBuffer used in the ZipOutputStream are memory hogs
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* and will hopefully be replaced eventually
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*
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* Acts on the same underlying XInputStream as both the full Zip File and other
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* EntryInputStreams, and thus must maintain its current position in the stream and
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* seek to it before performing any reads.
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*/
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EntryInputStream::EntryInputStream( Reference < io::XInputStream > xNewInput,
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const ZipEntry & rNewEntry,
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const vos::ORef < EncryptionData > &xEncryptData,
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sal_Bool bGetRawStream)
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: xStream( xNewInput )
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, xSeek( xNewInput, UNO_QUERY )
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, aEntry (rNewEntry )
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, nCurrent( 0 )
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, bHaveInMemory ( sal_False )
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, aInflater( sal_True )
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, aBuffer( 0 )
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, xEncryptionData (xEncryptData)
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, bRawStream (bGetRawStream)
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{
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if (bGetRawStream)
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{
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nUncompressedSize = aEntry.nMethod == DEFLATED ? aEntry.nCompressedSize : aEntry.nSize;
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nEnd = aEntry.nOffset + nUncompressedSize;
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}
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else
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{
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nEnd = aEntry.nMethod == DEFLATED ? aEntry.nOffset + aEntry.nCompressedSize : aEntry.nOffset + aEntry.nSize;
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nUncompressedSize = aEntry.nSize;
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}
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}
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void EntryInputStream::readIntoMemory()
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throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
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{
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if (!bHaveInMemory)
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{
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Sequence < sal_Int8 > aReadBuffer;
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xSeek->seek(aEntry.nOffset);
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sal_Int32 nSize = aEntry.nMethod == DEFLATED ? aEntry.nCompressedSize : aEntry.nSize;
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if (nSize <0)
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throw io::BufferSizeExceededException(::rtl::OUString(), *this);
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xStream->readBytes( aReadBuffer, nSize ); // Now it holds the raw stuff from disk
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if (xEncryptionData->aSalt.getLength())
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{
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// Have salt, will travel
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Sequence < sal_uInt8 > aDerivedKey (16);
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rtlCipherError aResult;
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Sequence < sal_Int8 > aDecryptBuffer;
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// Get the key
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rtl_digest_PBKDF2 ( aDerivedKey.getArray(), 16,
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reinterpret_cast < const sal_uInt8 * > (xEncryptionData->aKey.getConstArray()),
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xEncryptionData->aKey.getLength(),
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xEncryptionData->aSalt.getConstArray(),
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xEncryptionData->aSalt.getLength(),
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xEncryptionData->nIterationCount );
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rtlCipher aCipher = rtl_cipher_create (rtl_Cipher_AlgorithmBF, rtl_Cipher_ModeStream);
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aResult = rtl_cipher_init( aCipher, rtl_Cipher_DirectionDecode,
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aDerivedKey.getConstArray(),
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aDerivedKey.getLength(),
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xEncryptionData->aInitVector.getConstArray(),
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xEncryptionData->aInitVector.getLength());
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OSL_ASSERT (aResult == rtl_Cipher_E_None);
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aDecryptBuffer.realloc ( nSize );
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aResult = rtl_cipher_decode ( aCipher,
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aReadBuffer.getConstArray(),
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nSize,
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reinterpret_cast < sal_uInt8 * > (aDecryptBuffer.getArray()),
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nSize);
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OSL_ASSERT (aResult == rtl_Cipher_E_None);
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aReadBuffer = aDecryptBuffer; // Now it holds the decrypted data
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}
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if (bRawStream || aEntry.nMethod == STORED)
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aBuffer = aReadBuffer; // bRawStream means the caller doesn't want it decompressed
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else
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{
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aInflater.setInputSegment(aReadBuffer, 0, nSize );
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aBuffer.realloc( aEntry.nSize );
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aInflater.doInflate(aBuffer);
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aInflater.end();
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}
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bHaveInMemory = sal_True;
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}
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}
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EntryInputStream::~EntryInputStream( void )
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{
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}
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sal_Int32 SAL_CALL EntryInputStream::readBytes( Sequence< sal_Int8 >& aData,
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sal_Int32 nBytesToRead )
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throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
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{
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if (nBytesToRead <0)
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throw io::BufferSizeExceededException(::rtl::OUString(), *this);
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if (!bHaveInMemory)
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readIntoMemory();
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if (nBytesToRead + nCurrent > nUncompressedSize)
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nBytesToRead = static_cast < sal_Int32> ( nUncompressedSize - nCurrent );
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aData.realloc( nBytesToRead );
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memcpy(aData.getArray(), aBuffer.getConstArray() + nCurrent, nBytesToRead);
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nCurrent+=nBytesToRead;
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return nBytesToRead;
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}
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sal_Int32 SAL_CALL EntryInputStream::readSomeBytes( Sequence< sal_Int8 >& aData,
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sal_Int32 nMaxBytesToRead )
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throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
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{
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return readBytes( aData, nMaxBytesToRead );
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}
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void SAL_CALL EntryInputStream::skipBytes( sal_Int32 nBytesToSkip )
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throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, RuntimeException)
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{
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if (nBytesToSkip < 0)
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throw io::BufferSizeExceededException(::rtl::OUString(), *this);
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if (nBytesToSkip + nCurrent > nUncompressedSize)
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nBytesToSkip = static_cast < sal_Int32 > (nUncompressedSize- nCurrent);
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nCurrent+=nBytesToSkip;
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}
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sal_Int32 SAL_CALL EntryInputStream::available( )
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throw(io::NotConnectedException, io::IOException, RuntimeException)
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{
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return static_cast < sal_Int32 > (nUncompressedSize - nCurrent);
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}
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void SAL_CALL EntryInputStream::closeInput( )
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throw(io::NotConnectedException, io::IOException, RuntimeException)
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{
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}
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void SAL_CALL EntryInputStream::seek( sal_Int64 location )
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throw(lang::IllegalArgumentException, io::IOException, RuntimeException)
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{
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if (location > nUncompressedSize)
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location = nUncompressedSize;
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if (location <0)
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location = 0;
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nCurrent = location;
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}
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sal_Int64 SAL_CALL EntryInputStream::getPosition( )
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throw(io::IOException, RuntimeException)
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{
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return nCurrent;
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}
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sal_Int64 SAL_CALL EntryInputStream::getLength( )
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throw(io::IOException, RuntimeException)
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{
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return nUncompressedSize;
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}
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