368 lines
12 KiB
C++
368 lines
12 KiB
C++
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <ZipOutputEntry.hxx>
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#include <com/sun/star/packages/zip/ZipConstants.hpp>
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#include <comphelper/storagehelper.hxx>
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#include <osl/time.h>
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#include <PackageConstants.hxx>
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#include <ZipEntry.hxx>
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#include <ZipFile.hxx>
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#include <ZipPackageStream.hxx>
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using namespace com::sun::star;
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using namespace com::sun::star::io;
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using namespace com::sun::star::uno;
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using namespace com::sun::star::packages::zip::ZipConstants;
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/** This class is used to deflate Zip entries
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*/
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ZipOutputEntry::ZipOutputEntry( const uno::Reference< uno::XComponentContext >& rxContext,
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ByteChucker& rChucker,
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ZipEntry& rEntry,
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ZipPackageStream* pStream,
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bool bEncrypt)
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: m_aDeflateBuffer(n_ConstBufferSize)
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, m_aDeflater(DEFAULT_COMPRESSION, true)
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, m_rChucker(rChucker)
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, m_pCurrentEntry(&rEntry)
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, m_nDigested(0)
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, m_bEncryptCurrentEntry(false)
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, m_pCurrentStream(NULL)
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{
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if (rEntry.nTime == -1)
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rEntry.nTime = getCurrentDosTime();
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if (rEntry.nMethod == -1)
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rEntry.nMethod = DEFLATED;
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rEntry.nVersion = 20;
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rEntry.nFlag = 1 << 11;
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if (rEntry.nSize == -1 || rEntry.nCompressedSize == -1 ||
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rEntry.nCrc == -1)
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{
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rEntry.nSize = rEntry.nCompressedSize = 0;
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rEntry.nFlag |= 8;
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}
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if (bEncrypt)
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{
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m_bEncryptCurrentEntry = true;
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m_xCipherContext = ZipFile::StaticGetCipher( rxContext, pStream->GetEncryptionData(), true );
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m_xDigestContext = ZipFile::StaticGetDigestContextForChecksum( rxContext, pStream->GetEncryptionData() );
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m_nDigested = 0;
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rEntry.nFlag |= 1 << 4;
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m_pCurrentStream = pStream;
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}
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sal_Int32 nLOCLength = writeLOC(rEntry);
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rEntry.nOffset = m_rChucker.GetPosition() - nLOCLength;
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}
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ZipOutputEntry::~ZipOutputEntry( void )
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{
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}
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void SAL_CALL ZipOutputEntry::closeEntry( )
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throw(IOException, RuntimeException)
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{
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ZipEntry *pEntry = m_pCurrentEntry;
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if (pEntry)
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{
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switch (pEntry->nMethod)
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{
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case DEFLATED:
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m_aDeflater.finish();
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while (!m_aDeflater.finished())
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doDeflate();
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if ((pEntry->nFlag & 8) == 0)
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{
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if (pEntry->nSize != m_aDeflater.getTotalIn())
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{
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OSL_FAIL("Invalid entry size");
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}
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if (pEntry->nCompressedSize != m_aDeflater.getTotalOut())
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{
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// Different compression strategies make the merit of this
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// test somewhat dubious
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pEntry->nCompressedSize = m_aDeflater.getTotalOut();
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}
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if (pEntry->nCrc != m_aCRC.getValue())
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{
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OSL_FAIL("Invalid entry CRC-32");
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}
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}
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else
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{
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if ( !m_bEncryptCurrentEntry )
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{
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pEntry->nSize = m_aDeflater.getTotalIn();
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pEntry->nCompressedSize = m_aDeflater.getTotalOut();
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}
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pEntry->nCrc = m_aCRC.getValue();
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writeEXT(*pEntry);
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}
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m_aDeflater.reset();
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m_aCRC.reset();
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break;
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case STORED:
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if (!((pEntry->nFlag & 8) == 0))
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OSL_FAIL( "Serious error, one of compressed size, size or CRC was -1 in a STORED stream");
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break;
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default:
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OSL_FAIL("Invalid compression method");
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break;
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}
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if (m_bEncryptCurrentEntry)
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{
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m_bEncryptCurrentEntry = false;
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m_xCipherContext.clear();
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uno::Sequence< sal_Int8 > aDigestSeq;
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if ( m_xDigestContext.is() )
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{
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aDigestSeq = m_xDigestContext->finalizeDigestAndDispose();
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m_xDigestContext.clear();
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}
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if ( m_pCurrentStream )
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m_pCurrentStream->setDigest( aDigestSeq );
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}
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m_pCurrentEntry = NULL;
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m_pCurrentStream = NULL;
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}
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}
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void SAL_CALL ZipOutputEntry::write( const Sequence< sal_Int8 >& rBuffer, sal_Int32 nNewOffset, sal_Int32 nNewLength )
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throw(IOException, RuntimeException)
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{
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switch (m_pCurrentEntry->nMethod)
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{
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case DEFLATED:
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if (!m_aDeflater.finished())
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{
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m_aDeflater.setInputSegment(rBuffer, nNewOffset, nNewLength);
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while (!m_aDeflater.needsInput())
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doDeflate();
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if (!m_bEncryptCurrentEntry)
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m_aCRC.updateSegment(rBuffer, nNewOffset, nNewLength);
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}
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break;
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case STORED:
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{
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Sequence < sal_Int8 > aTmpBuffer ( rBuffer.getConstArray(), nNewLength );
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m_rChucker.WriteBytes( aTmpBuffer );
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}
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break;
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}
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}
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void SAL_CALL ZipOutputEntry::rawWrite( Sequence< sal_Int8 >& rBuffer, sal_Int32 /*nNewOffset*/, sal_Int32 nNewLength )
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throw(IOException, RuntimeException)
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{
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Sequence < sal_Int8 > aTmpBuffer ( rBuffer.getConstArray(), nNewLength );
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m_rChucker.WriteBytes( aTmpBuffer );
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}
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void SAL_CALL ZipOutputEntry::rawCloseEntry( )
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throw(IOException, RuntimeException)
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{
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if ( m_pCurrentEntry->nMethod == DEFLATED && ( m_pCurrentEntry->nFlag & 8 ) )
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writeEXT(*m_pCurrentEntry);
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m_pCurrentEntry = NULL;
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}
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void ZipOutputEntry::doDeflate()
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{
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sal_Int32 nLength = m_aDeflater.doDeflateSegment(m_aDeflateBuffer, 0, m_aDeflateBuffer.getLength());
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if ( nLength > 0 )
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{
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uno::Sequence< sal_Int8 > aTmpBuffer( m_aDeflateBuffer.getConstArray(), nLength );
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if ( m_bEncryptCurrentEntry && m_xDigestContext.is() && m_xCipherContext.is() )
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{
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// Need to update our digest before encryption...
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sal_Int32 nDiff = n_ConstDigestLength - m_nDigested;
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if ( nDiff )
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{
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sal_Int32 nEat = ::std::min( nLength, nDiff );
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uno::Sequence< sal_Int8 > aTmpSeq( aTmpBuffer.getConstArray(), nEat );
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m_xDigestContext->updateDigest( aTmpSeq );
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m_nDigested = m_nDigested + static_cast< sal_Int16 >( nEat );
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}
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// FIXME64: uno::Sequence not 64bit safe.
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uno::Sequence< sal_Int8 > aEncryptionBuffer = m_xCipherContext->convertWithCipherContext( aTmpBuffer );
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m_rChucker.WriteBytes( aEncryptionBuffer );
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// the sizes as well as checksum for encrypted streams is calculated here
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m_pCurrentEntry->nCompressedSize += aEncryptionBuffer.getLength();
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m_pCurrentEntry->nSize = m_pCurrentEntry->nCompressedSize;
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m_aCRC.update( aEncryptionBuffer );
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}
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else
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{
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m_rChucker.WriteBytes ( aTmpBuffer );
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}
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}
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if ( m_aDeflater.finished() && m_bEncryptCurrentEntry && m_xDigestContext.is() && m_xCipherContext.is() )
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{
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// FIXME64: sequence not 64bit safe.
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uno::Sequence< sal_Int8 > aEncryptionBuffer = m_xCipherContext->finalizeCipherContextAndDispose();
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if ( aEncryptionBuffer.getLength() )
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{
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m_rChucker.WriteBytes( aEncryptionBuffer );
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// the sizes as well as checksum for encrypted streams is calculated hier
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m_pCurrentEntry->nCompressedSize += aEncryptionBuffer.getLength();
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m_pCurrentEntry->nSize = m_pCurrentEntry->nCompressedSize;
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m_aCRC.update( aEncryptionBuffer );
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}
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}
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}
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static sal_uInt32 getTruncated( sal_Int64 nNum, bool *pIsTruncated )
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{
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if( nNum >= 0xffffffff )
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{
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*pIsTruncated = true;
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return 0xffffffff;
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}
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else
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return static_cast< sal_uInt32 >( nNum );
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}
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void ZipOutputEntry::writeEXT( const ZipEntry &rEntry )
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throw(IOException, RuntimeException)
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{
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bool bWrite64Header = false;
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m_rChucker << EXTSIG;
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m_rChucker << static_cast < sal_uInt32> ( rEntry.nCrc );
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m_rChucker << getTruncated( rEntry.nCompressedSize, &bWrite64Header );
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m_rChucker << getTruncated( rEntry.nSize, &bWrite64Header );
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if( bWrite64Header )
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{
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// FIXME64: need to append a ZIP64 header instead of throwing
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// We're about to silently lose people's data - which they are
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// unlikely to appreciate so fail instead:
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throw IOException( "File contains streams that are too large." );
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}
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}
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sal_Int32 ZipOutputEntry::writeLOC( const ZipEntry &rEntry )
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throw(IOException, RuntimeException)
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{
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if ( !::comphelper::OStorageHelper::IsValidZipEntryFileName( rEntry.sPath, true ) )
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throw IOException("Unexpected character is used in file name." );
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OString sUTF8Name = OUStringToOString( rEntry.sPath, RTL_TEXTENCODING_UTF8 );
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sal_Int16 nNameLength = static_cast < sal_Int16 > ( sUTF8Name.getLength() );
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m_rChucker << LOCSIG;
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m_rChucker << rEntry.nVersion;
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if (rEntry.nFlag & (1 << 4) )
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{
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// If it's an encrypted entry, we pretend its stored plain text
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sal_Int16 nTmpFlag = rEntry.nFlag;
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nTmpFlag &= ~(1 <<4 );
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m_rChucker << nTmpFlag;
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m_rChucker << static_cast < sal_Int16 > ( STORED );
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}
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else
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{
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m_rChucker << rEntry.nFlag;
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m_rChucker << rEntry.nMethod;
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}
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bool bWrite64Header = false;
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m_rChucker << static_cast < sal_uInt32 > (rEntry.nTime);
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if ((rEntry.nFlag & 8) == 8 )
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{
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m_rChucker << static_cast < sal_Int32 > (0);
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m_rChucker << static_cast < sal_Int32 > (0);
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m_rChucker << static_cast < sal_Int32 > (0);
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}
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else
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{
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m_rChucker << static_cast < sal_uInt32 > (rEntry.nCrc);
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m_rChucker << getTruncated( rEntry.nCompressedSize, &bWrite64Header );
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m_rChucker << getTruncated( rEntry.nSize, &bWrite64Header );
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}
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m_rChucker << nNameLength;
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m_rChucker << static_cast < sal_Int16 > (0);
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if( bWrite64Header )
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{
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// FIXME64: need to append a ZIP64 header instead of throwing
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// We're about to silently lose people's data - which they are
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// unlikely to appreciate so fail instead:
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throw IOException( "File contains streams that are too large." );
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}
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Sequence < sal_Int8 > aSequence( (sal_Int8*)sUTF8Name.getStr(), sUTF8Name.getLength() );
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m_rChucker.WriteBytes( aSequence );
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return LOCHDR + nNameLength;
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}
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sal_uInt32 ZipOutputEntry::getCurrentDosTime( )
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{
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oslDateTime aDateTime;
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TimeValue aTimeValue;
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osl_getSystemTime ( &aTimeValue );
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osl_getDateTimeFromTimeValue( &aTimeValue, &aDateTime);
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// at year 2108, there is an overflow
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// -> some decision needs to be made
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// how to handle the ZIP file format (just overflow?)
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// if the current system time is before 1980,
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// then the time traveller will have to make a decision
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// how to handle the ZIP file format before it is invented
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// (just underflow?)
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assert(aDateTime.Year > 1980 && aDateTime.Year < 2108);
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sal_uInt32 nYear = static_cast <sal_uInt32> (aDateTime.Year);
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if (nYear>=1980)
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nYear-=1980;
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else if (nYear>=80)
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{
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nYear-=80;
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}
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sal_uInt32 nResult = static_cast < sal_uInt32>( ( ( ( aDateTime.Day) +
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( 32 * (aDateTime.Month)) +
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( 512 * nYear ) ) << 16) |
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( ( aDateTime.Seconds/2) +
|
||
|
|
( 32 * aDateTime.Minutes) +
|
||
|
|
( 2048 * static_cast <sal_uInt32 > (aDateTime.Hours) ) ) );
|
||
|
|
return nResult;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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