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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 :
21 : #include <com/sun/star/packages/zip/ZipConstants.hpp>
22 : #include <com/sun/star/packages/zip/ZipIOException.hpp>
23 : #include <com/sun/star/xml/crypto/CipherID.hpp>
24 :
25 : #include <XUnbufferedStream.hxx>
26 : #include <EncryptionData.hxx>
27 : #include <PackageConstants.hxx>
28 : #include <ZipFile.hxx>
29 : #include <EncryptedDataHeader.hxx>
30 : #include <algorithm>
31 : #include <string.h>
32 :
33 : #include <osl/mutex.hxx>
34 :
35 : using namespace ::com::sun::star;
36 : using namespace com::sun::star::packages::zip::ZipConstants;
37 : using namespace com::sun::star::io;
38 : using namespace com::sun::star::uno;
39 : using com::sun::star::lang::IllegalArgumentException;
40 : using com::sun::star::packages::zip::ZipIOException;
41 : using ::rtl::OUString;
42 :
43 2296 : XUnbufferedStream::XUnbufferedStream(
44 : const uno::Reference< uno::XComponentContext >& xContext,
45 : SotMutexHolderRef aMutexHolder,
46 : ZipEntry & rEntry,
47 : Reference < XInputStream > xNewZipStream,
48 : const ::rtl::Reference< EncryptionData >& rData,
49 : sal_Int8 nStreamMode,
50 : sal_Bool bIsEncrypted,
51 : const ::rtl::OUString& aMediaType,
52 : sal_Bool bRecoveryMode )
53 2296 : : maMutexHolder( aMutexHolder.Is() ? aMutexHolder : SotMutexHolderRef( new SotMutexHolder ) )
54 : , mxZipStream ( xNewZipStream )
55 : , mxZipSeek ( xNewZipStream, UNO_QUERY )
56 : , maEntry ( rEntry )
57 : , mxData ( rData )
58 : , mnBlockSize( 1 )
59 : , maInflater ( sal_True )
60 : , mbRawStream ( nStreamMode == UNBUFF_STREAM_RAW || nStreamMode == UNBUFF_STREAM_WRAPPEDRAW )
61 : , mbWrappedRaw ( nStreamMode == UNBUFF_STREAM_WRAPPEDRAW )
62 : , mbFinished ( sal_False )
63 : , mnHeaderToRead ( 0 )
64 : , mnZipCurrent ( 0 )
65 : , mnZipEnd ( 0 )
66 : , mnZipSize ( 0 )
67 : , mnMyCurrent ( 0 )
68 4592 : , mbCheckCRC( !bRecoveryMode )
69 : {
70 2296 : mnZipCurrent = maEntry.nOffset;
71 2296 : if ( mbRawStream )
72 : {
73 108 : mnZipSize = maEntry.nMethod == DEFLATED ? maEntry.nCompressedSize : maEntry.nSize;
74 108 : mnZipEnd = maEntry.nOffset + mnZipSize;
75 : }
76 : else
77 : {
78 2188 : mnZipSize = maEntry.nSize;
79 2188 : mnZipEnd = maEntry.nMethod == DEFLATED ? maEntry.nOffset + maEntry.nCompressedSize : maEntry.nOffset + maEntry.nSize;
80 : }
81 :
82 2296 : if (mnZipSize < 0)
83 0 : throw ZipIOException(OUString("The stream seems to be broken!"), uno::Reference< XInterface >());
84 :
85 2296 : sal_Bool bHaveEncryptData = ( rData.is() && rData->m_aSalt.getLength() && rData->m_aInitVector.getLength() && rData->m_nIterationCount != 0 ) ? sal_True : sal_False;
86 2296 : sal_Bool bMustDecrypt = ( nStreamMode == UNBUFF_STREAM_DATA && bHaveEncryptData && bIsEncrypted ) ? sal_True : sal_False;
87 :
88 2296 : if ( bMustDecrypt )
89 : {
90 12 : m_xCipherContext = ZipFile::StaticGetCipher( xContext, rData, false );
91 12 : mnBlockSize = ( rData->m_nEncAlg == xml::crypto::CipherID::AES_CBC_W3C_PADDING ? 16 : 1 );
92 : }
93 :
94 2296 : if ( bHaveEncryptData && mbWrappedRaw && bIsEncrypted )
95 : {
96 : // if we have the data needed to decrypt it, but didn't want it decrypted (or
97 : // we couldn't decrypt it due to wrong password), then we prepend this
98 : // data to the stream
99 :
100 : // Make a buffer big enough to hold both the header and the data itself
101 : maHeader.realloc ( n_ConstHeaderSize +
102 0 : rData->m_aInitVector.getLength() +
103 0 : rData->m_aSalt.getLength() +
104 0 : rData->m_aDigest.getLength() +
105 0 : aMediaType.getLength() * sizeof( sal_Unicode ) );
106 0 : sal_Int8 * pHeader = maHeader.getArray();
107 0 : ZipFile::StaticFillHeader( rData, rEntry.nSize, aMediaType, pHeader );
108 0 : mnHeaderToRead = static_cast < sal_Int16 > ( maHeader.getLength() );
109 : }
110 2296 : }
111 :
112 : // allows to read package raw stream
113 0 : XUnbufferedStream::XUnbufferedStream(
114 : const uno::Reference< uno::XComponentContext >& /*xContext*/,
115 : const Reference < XInputStream >& xRawStream,
116 : const ::rtl::Reference< EncryptionData >& rData )
117 0 : : maMutexHolder( new SotMutexHolder )
118 : , mxZipStream ( xRawStream )
119 : , mxZipSeek ( xRawStream, UNO_QUERY )
120 : , mxData ( rData )
121 : , mnBlockSize( 1 )
122 : , maInflater ( sal_True )
123 : , mbRawStream ( sal_False )
124 : , mbWrappedRaw ( sal_False )
125 : , mbFinished ( sal_False )
126 : , mnHeaderToRead ( 0 )
127 : , mnZipCurrent ( 0 )
128 : , mnZipEnd ( 0 )
129 : , mnZipSize ( 0 )
130 : , mnMyCurrent ( 0 )
131 0 : , mbCheckCRC( sal_False )
132 : {
133 : // for this scenario maEntry is not set !!!
134 : OSL_ENSURE( mxZipSeek.is(), "The stream must be seekable!\n" );
135 :
136 : // skip raw header, it must be already parsed to rData
137 0 : mnZipCurrent = n_ConstHeaderSize + rData->m_aInitVector.getLength() +
138 0 : rData->m_aSalt.getLength() + rData->m_aDigest.getLength();
139 :
140 : try {
141 0 : if ( mxZipSeek.is() )
142 0 : mnZipSize = mxZipSeek->getLength();
143 0 : } catch( Exception& )
144 : {
145 : // in case of problem the size will stay set to 0
146 : }
147 :
148 0 : mnZipEnd = mnZipCurrent + mnZipSize;
149 :
150 : // the raw data will not be decrypted, no need for the cipher
151 : // m_xCipherContext = ZipFile::StaticGetCipher( xContext, rData, false );
152 0 : }
153 :
154 4592 : XUnbufferedStream::~XUnbufferedStream()
155 : {
156 4592 : }
157 :
158 3203 : sal_Int32 SAL_CALL XUnbufferedStream::readBytes( Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )
159 : throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
160 : {
161 3203 : ::osl::MutexGuard aGuard( maMutexHolder->GetMutex() );
162 :
163 3203 : sal_Int32 nRequestedBytes = nBytesToRead;
164 : OSL_ENSURE( !mnHeaderToRead || mbWrappedRaw, "Only encrypted raw stream can be provided with header!" );
165 3203 : if ( mnMyCurrent + nRequestedBytes > mnZipSize + maHeader.getLength() )
166 3135 : nRequestedBytes = static_cast < sal_Int32 > ( mnZipSize + maHeader.getLength() - mnMyCurrent );
167 :
168 3203 : sal_Int32 nTotal = 0;
169 3203 : aData.realloc ( nRequestedBytes );
170 3203 : if ( nRequestedBytes )
171 : {
172 1909 : sal_Int32 nRead = 0;
173 1909 : sal_Int32 nLastRead = 0;
174 1909 : if ( mbRawStream )
175 : {
176 108 : sal_Int64 nDiff = mnZipEnd - mnZipCurrent;
177 :
178 108 : if ( mbWrappedRaw && mnHeaderToRead )
179 : {
180 : sal_Int16 nHeadRead = static_cast< sal_Int16 >(( nRequestedBytes > mnHeaderToRead ?
181 0 : mnHeaderToRead : nRequestedBytes ));
182 0 : memcpy ( aData.getArray(), maHeader.getConstArray() + maHeader.getLength() - mnHeaderToRead, nHeadRead );
183 0 : mnHeaderToRead = mnHeaderToRead - nHeadRead;
184 :
185 0 : if ( nHeadRead < nRequestedBytes )
186 : {
187 0 : sal_Int32 nToRead = nRequestedBytes - nHeadRead;
188 0 : nToRead = ( nDiff < nToRead ) ? sal::static_int_cast< sal_Int32 >( nDiff ) : nToRead;
189 :
190 0 : Sequence< sal_Int8 > aPureData( nToRead );
191 0 : mxZipSeek->seek ( mnZipCurrent );
192 0 : nRead = mxZipStream->readBytes ( aPureData, nToRead );
193 0 : mnZipCurrent += nRead;
194 :
195 0 : aPureData.realloc( nRead );
196 0 : if ( mbCheckCRC )
197 0 : maCRC.update( aPureData );
198 :
199 0 : aData.realloc( nHeadRead + nRead );
200 :
201 0 : sal_Int8* pPureBuffer = aPureData.getArray();
202 0 : sal_Int8* pBuffer = aData.getArray();
203 0 : for ( sal_Int32 nInd = 0; nInd < nRead; nInd++ )
204 0 : pBuffer[ nHeadRead + nInd ] = pPureBuffer[ nInd ];
205 : }
206 :
207 0 : nRead += nHeadRead;
208 : }
209 : else
210 : {
211 108 : mxZipSeek->seek ( mnZipCurrent );
212 :
213 108 : nRead = mxZipStream->readBytes (
214 : aData,
215 108 : static_cast < sal_Int32 > ( nDiff < nRequestedBytes ? nDiff : nRequestedBytes ) );
216 :
217 108 : mnZipCurrent += nRead;
218 :
219 108 : aData.realloc( nRead );
220 108 : if ( mbWrappedRaw && mbCheckCRC )
221 0 : maCRC.update( aData );
222 : }
223 : }
224 : else
225 : {
226 5336 : while ( 0 == ( nLastRead = maInflater.doInflateSegment( aData, nRead, aData.getLength() - nRead ) ) ||
227 : ( nRead + nLastRead != nRequestedBytes && mnZipCurrent < mnZipEnd ) )
228 : {
229 1735 : nRead += nLastRead;
230 :
231 1735 : if ( nRead > nRequestedBytes )
232 : throw RuntimeException(
233 : "Should not be possible to read more then requested!",
234 0 : Reference< XInterface >() );
235 :
236 1735 : if ( maInflater.finished() || maInflater.getLastInflateError() )
237 : throw ZipIOException("The stream seems to be broken!",
238 1 : Reference< XInterface >() );
239 :
240 1734 : if ( maInflater.needsDictionary() )
241 : throw ZipIOException("Dictionaries are not supported!",
242 0 : Reference< XInterface >() );
243 :
244 1734 : sal_Int32 nDiff = static_cast< sal_Int32 >( mnZipEnd - mnZipCurrent );
245 1734 : if ( nDiff > 0 )
246 : {
247 1734 : mxZipSeek->seek ( mnZipCurrent );
248 :
249 1734 : sal_Int32 nToRead = std::max( nRequestedBytes, static_cast< sal_Int32 >( 8192 ) );
250 1734 : if ( mnBlockSize > 1 )
251 8 : nToRead = nToRead + mnBlockSize - nToRead % mnBlockSize;
252 1734 : nToRead = std::min( nDiff, nToRead );
253 :
254 1734 : sal_Int32 nZipRead = mxZipStream->readBytes( maCompBuffer, nToRead );
255 1734 : if ( nZipRead < nToRead )
256 : throw ZipIOException("No expected data!",
257 0 : Reference< XInterface >() );
258 :
259 1734 : mnZipCurrent += nZipRead;
260 : // maCompBuffer now has the data, check if we need to decrypt
261 : // before passing to the Inflater
262 1734 : if ( m_xCipherContext.is() )
263 : {
264 12 : if ( mbCheckCRC )
265 12 : maCRC.update( maCompBuffer );
266 :
267 12 : maCompBuffer = m_xCipherContext->convertWithCipherContext( maCompBuffer );
268 12 : if ( mnZipCurrent == mnZipEnd )
269 : {
270 12 : uno::Sequence< sal_Int8 > aSuffix = m_xCipherContext->finalizeCipherContextAndDispose();
271 12 : if ( aSuffix.getLength() )
272 : {
273 8 : sal_Int32 nOldLen = maCompBuffer.getLength();
274 8 : maCompBuffer.realloc( nOldLen + aSuffix.getLength() );
275 8 : memcpy( maCompBuffer.getArray() + nOldLen, aSuffix.getConstArray(), aSuffix.getLength() );
276 12 : }
277 : }
278 : }
279 1734 : maInflater.setInput ( maCompBuffer );
280 : }
281 : else
282 : {
283 : throw ZipIOException("The stream seems to be broken!",
284 0 : Reference< XInterface >() );
285 : }
286 : }
287 : }
288 :
289 1908 : mnMyCurrent += nRead + nLastRead;
290 1908 : nTotal = nRead + nLastRead;
291 1908 : if ( nTotal < nRequestedBytes)
292 0 : aData.realloc ( nTotal );
293 :
294 1908 : if ( mbCheckCRC && ( !mbRawStream || mbWrappedRaw ) )
295 : {
296 1800 : if ( !m_xCipherContext.is() && !mbWrappedRaw )
297 1788 : maCRC.update( aData );
298 :
299 1800 : if ( mnZipSize + maHeader.getLength() == mnMyCurrent && maCRC.getValue() != maEntry.nCrc )
300 : throw ZipIOException("The stream seems to be broken!",
301 0 : Reference< XInterface >() );
302 : }
303 : }
304 :
305 3203 : return nTotal;
306 : }
307 :
308 2622 : sal_Int32 SAL_CALL XUnbufferedStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
309 : throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
310 : {
311 2622 : return readBytes ( aData, nMaxBytesToRead );
312 : }
313 0 : void SAL_CALL XUnbufferedStream::skipBytes( sal_Int32 nBytesToSkip )
314 : throw( NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
315 : {
316 0 : if ( nBytesToSkip )
317 : {
318 0 : Sequence < sal_Int8 > aSequence ( nBytesToSkip );
319 0 : readBytes ( aSequence, nBytesToSkip );
320 : }
321 0 : }
322 :
323 0 : sal_Int32 SAL_CALL XUnbufferedStream::available( )
324 : throw( NotConnectedException, IOException, RuntimeException)
325 : {
326 0 : return static_cast < sal_Int32 > ( mnZipSize - mnMyCurrent );
327 : }
328 :
329 1073 : void SAL_CALL XUnbufferedStream::closeInput( )
330 : throw( NotConnectedException, IOException, RuntimeException)
331 : {
332 1073 : }
333 :
334 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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