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/* -*- 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 <com/sun/star/packages/zip/ZipConstants.hpp>
#include <com/sun/star/packages/zip/ZipIOException.hpp>
#include <com/sun/star/xml/crypto/CipherID.hpp>
#include "XUnbufferedStream.hxx"
#include <EncryptionData.hxx>
#include <ZipFile.hxx>
#include <EncryptedDataHeader.hxx>
#include <algorithm>
#include <string.h>
#include <osl/diagnose.h>
#include <osl/mutex.hxx>
#include <tools/diagnose_ex.h>
using namespace ::com::sun::star;
using namespace com::sun::star::packages::zip::ZipConstants;
using namespace com::sun::star::io;
using namespace com::sun::star::uno;
using com::sun::star::packages::zip::ZipIOException;
XUnbufferedStream::XUnbufferedStream(
const uno::Reference< uno::XComponentContext >& xContext,
const rtl::Reference< comphelper::RefCountedMutex >& aMutexHolder,
ZipEntry const & rEntry,
Reference < XInputStream > const & xNewZipStream,
const ::rtl::Reference< EncryptionData >& rData,
sal_Int8 nStreamMode,
bool bIsEncrypted,
const OUString& aMediaType,
bool bRecoveryMode )
: maMutexHolder( aMutexHolder )
, mxZipStream ( xNewZipStream )
, mxZipSeek ( xNewZipStream, UNO_QUERY )
, maEntry ( rEntry )
, mnBlockSize( 1 )
, maInflater ( true )
, mbRawStream ( nStreamMode == UNBUFF_STREAM_RAW || nStreamMode == UNBUFF_STREAM_WRAPPEDRAW )
, mbWrappedRaw ( nStreamMode == UNBUFF_STREAM_WRAPPEDRAW )
, mnHeaderToRead ( 0 )
, mnZipCurrent ( 0 )
, mnZipEnd ( 0 )
, mnZipSize ( 0 )
, mnMyCurrent ( 0 )
, mbCheckCRC(!bRecoveryMode)
{
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 (mnZipSize < 0)
throw ZipIOException("The stream seems to be broken!");
bool bHaveEncryptData = rData.is() && rData->m_aInitVector.hasElements() &&
((rData->m_aSalt.hasElements() && rData->m_nIterationCount != 0)
||
rData->m_aKey.hasElements());
bool bMustDecrypt = nStreamMode == UNBUFF_STREAM_DATA && bHaveEncryptData && bIsEncrypted;
if ( bMustDecrypt )
{
m_xCipherContext = ZipFile::StaticGetCipher( xContext, rData, false );
mnBlockSize = ( rData->m_nEncAlg == xml::crypto::CipherID::AES_CBC_W3C_PADDING ? 16 : 1 );
}
if ( !(bHaveEncryptData && mbWrappedRaw && bIsEncrypted) )
return;
// if we have the data needed to decrypt it, but didn't want it decrypted (or
// we couldn't decrypt it due to wrong password), then we prepend this
// data to the stream
// Make a buffer big enough to hold both the header and the data itself
maHeader.realloc ( n_ConstHeaderSize +
rData->m_aInitVector.getLength() +
rData->m_aSalt.getLength() +
rData->m_aDigest.getLength() +
aMediaType.getLength() * sizeof( sal_Unicode ) );
sal_Int8 * pHeader = maHeader.getArray();
ZipFile::StaticFillHeader( rData, rEntry.nSize, aMediaType, pHeader );
mnHeaderToRead = static_cast < sal_Int16 > ( maHeader.getLength() );
mnZipSize += mnHeaderToRead;
}
// allows to read package raw stream
XUnbufferedStream::XUnbufferedStream(
const rtl::Reference< comphelper::RefCountedMutex >& aMutexHolder,
const Reference < XInputStream >& xRawStream,
const ::rtl::Reference< EncryptionData >& rData )
: maMutexHolder( aMutexHolder )
, mxZipStream ( xRawStream )
, mxZipSeek ( xRawStream, UNO_QUERY )
, mnBlockSize( 1 )
, maInflater ( true )
, mbRawStream ( false )
, mbWrappedRaw ( false )
, mnHeaderToRead ( 0 )
, mnZipCurrent ( 0 )
, mnZipEnd ( 0 )
, mnZipSize ( 0 )
, mnMyCurrent ( 0 )
, mbCheckCRC( false )
{
// for this scenario maEntry is not set !!!
OSL_ENSURE( mxZipSeek.is(), "The stream must be seekable!" );
// skip raw header, it must be already parsed to rData
mnZipCurrent = n_ConstHeaderSize + rData->m_aInitVector.getLength() +
rData->m_aSalt.getLength() + rData->m_aDigest.getLength();
try {
if ( mxZipSeek.is() )
mnZipSize = mxZipSeek->getLength();
} catch( const Exception& )
{
// in case of problem the size will stay set to 0
TOOLS_WARN_EXCEPTION("package", "ignoring");
}
mnZipEnd = mnZipCurrent + mnZipSize;
// the raw data will not be decrypted, no need for the cipher
// m_xCipherContext = ZipFile::StaticGetCipher( xContext, rData, false );
}
XUnbufferedStream::~XUnbufferedStream()
{
}
sal_Int32 SAL_CALL XUnbufferedStream::readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
{
::osl::MutexGuard aGuard( maMutexHolder->GetMutex() );
sal_Int32 nRequestedBytes = nBytesToRead;
OSL_ENSURE( !mnHeaderToRead || mbWrappedRaw, "Only encrypted raw stream can be provided with header!" );
if ( mnMyCurrent + nRequestedBytes > mnZipSize + maHeader.getLength() )
nRequestedBytes = static_cast < sal_Int32 > ( mnZipSize + maHeader.getLength() - mnMyCurrent );
sal_Int32 nTotal = 0;
aData.realloc ( nRequestedBytes );
if ( nRequestedBytes )
{
sal_Int32 nRead = 0;
sal_Int32 nLastRead = 0;
if ( mbRawStream )
{
sal_Int64 nDiff = mnZipEnd - mnZipCurrent;
if ( mbWrappedRaw && mnHeaderToRead )
{
sal_Int16 nHeadRead = static_cast< sal_Int16 >(( nRequestedBytes > mnHeaderToRead ?
mnHeaderToRead : nRequestedBytes ));
memcpy ( aData.getArray(), maHeader.getConstArray() + maHeader.getLength() - mnHeaderToRead, nHeadRead );
mnHeaderToRead = mnHeaderToRead - nHeadRead;
if ( nHeadRead < nRequestedBytes )
{
sal_Int32 nToRead = nRequestedBytes - nHeadRead;
nToRead = ( nDiff < nToRead ) ? sal::static_int_cast< sal_Int32 >( nDiff ) : nToRead;
Sequence< sal_Int8 > aPureData( nToRead );
mxZipSeek->seek ( mnZipCurrent );
nRead = mxZipStream->readBytes ( aPureData, nToRead );
mnZipCurrent += nRead;
aPureData.realloc( nRead );
if ( mbCheckCRC )
maCRC.update( aPureData );
aData.realloc( nHeadRead + nRead );
const sal_Int8* pPureBuffer = aPureData.getConstArray();
sal_Int8* pBuffer = aData.getArray();
for ( sal_Int32 nInd = 0; nInd < nRead; nInd++ )
pBuffer[ nHeadRead + nInd ] = pPureBuffer[ nInd ];
}
nRead += nHeadRead;
}
else
{
mxZipSeek->seek ( mnZipCurrent );
nRead = mxZipStream->readBytes (
aData,
std::min<sal_Int64>(nDiff, nRequestedBytes) );
mnZipCurrent += nRead;
aData.realloc( nRead );
if ( mbWrappedRaw && mbCheckCRC )
maCRC.update( aData );
}
}
else
{
for (;;)
{
nLastRead = maInflater.doInflateSegment( aData, nRead, aData.getLength() - nRead );
if ( 0 != nLastRead && ( nRead + nLastRead == nRequestedBytes || mnZipCurrent >= mnZipEnd ) )
break;
nRead += nLastRead;
if ( nRead > nRequestedBytes )
throw RuntimeException(
"Should not be possible to read more than requested!" );
if ( maInflater.finished() || maInflater.getLastInflateError() )
throw ZipIOException("The stream seems to be broken!" );
if ( maInflater.needsDictionary() )
throw ZipIOException("Dictionaries are not supported!" );
sal_Int32 nDiff = static_cast< sal_Int32 >( mnZipEnd - mnZipCurrent );
if ( nDiff <= 0 )
{
throw ZipIOException("The stream seems to be broken!" );
}
mxZipSeek->seek ( mnZipCurrent );
sal_Int32 nToRead = std::max( nRequestedBytes, static_cast< sal_Int32 >( 8192 ) );
if ( mnBlockSize > 1 )
nToRead = nToRead + mnBlockSize - nToRead % mnBlockSize;
nToRead = std::min( nDiff, nToRead );
sal_Int32 nZipRead = mxZipStream->readBytes( maCompBuffer, nToRead );
if ( nZipRead < nToRead )
throw ZipIOException("No expected data!" );
mnZipCurrent += nZipRead;
// maCompBuffer now has the data, check if we need to decrypt
// before passing to the Inflater
if ( m_xCipherContext.is() )
{
if ( mbCheckCRC )
maCRC.update( maCompBuffer );
maCompBuffer = m_xCipherContext->convertWithCipherContext( maCompBuffer );
if ( mnZipCurrent == mnZipEnd )
{
uno::Sequence< sal_Int8 > aSuffix = m_xCipherContext->finalizeCipherContextAndDispose();
if ( aSuffix.hasElements() )
{
sal_Int32 nOldLen = maCompBuffer.getLength();
maCompBuffer.realloc( nOldLen + aSuffix.getLength() );
memcpy( maCompBuffer.getArray() + nOldLen, aSuffix.getConstArray(), aSuffix.getLength() );
}
}
}
maInflater.setInput ( maCompBuffer );
}
}
mnMyCurrent += nRead + nLastRead;
nTotal = nRead + nLastRead;
if ( nTotal < nRequestedBytes)
aData.realloc ( nTotal );
if ( mbCheckCRC && ( !mbRawStream || mbWrappedRaw ) )
{
if ( !m_xCipherContext.is() && !mbWrappedRaw )
maCRC.update( aData );
if ( mnZipSize + maHeader.getLength() == mnMyCurrent && maCRC.getValue() != maEntry.nCrc )
throw ZipIOException("The stream seems to be broken!" );
}
}
return nTotal;
}
sal_Int32 SAL_CALL XUnbufferedStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
{
return readBytes ( aData, nMaxBytesToRead );
}
void SAL_CALL XUnbufferedStream::skipBytes( sal_Int32 nBytesToSkip )
{
if ( nBytesToSkip )
{
Sequence < sal_Int8 > aSequence ( nBytesToSkip );
readBytes ( aSequence, nBytesToSkip );
}
}
sal_Int32 SAL_CALL XUnbufferedStream::available( )
{
//available size must include the prepended header in case of wrapped raw stream
return static_cast< sal_Int32 > ( std::min< sal_Int64 >( SAL_MAX_INT32, (mnZipSize + mnHeaderToRead - mnMyCurrent) ) );
}
void SAL_CALL XUnbufferedStream::closeInput( )
{
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
