1 /* |
|
2 * Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: This module contains the implementation of CCbsRecDecoder class |
|
15 * member functions. |
|
16 * |
|
17 * CCCbsRecDecoder handles decoding of message contents. |
|
18 * |
|
19 * CbsServer receives messages stored in 8-bit descriptors |
|
20 * from ETel. This class converts them into 16-bit descriptors |
|
21 * and decodes the message representation into UCS-2 (which |
|
22 * is used by Symbian OS internally). |
|
23 * |
|
24 */ |
|
25 |
|
26 |
|
27 // INCLUDE FILES |
|
28 |
|
29 #include <e32svr.h> |
|
30 #include <charconv.h> |
|
31 #include "CbsServerConstants.h" |
|
32 #include "CCbsRecDecoder.h" |
|
33 #include "CCbsMessage.h" |
|
34 #include "CCbsRecMessage.h" |
|
35 #include "CCbsRecWcdmaMessage.h" |
|
36 #include "CbsLogger.h" |
|
37 |
|
38 // CONSTANTS |
|
39 |
|
40 // Max characters in generated unicode |
|
41 const TInt KMaxCharsInGeneratedUnicode = 128; |
|
42 |
|
43 // ================= MEMBER FUNCTIONS ======================= |
|
44 |
|
45 // ----------------------------------------------------------------------------- |
|
46 // CCbsMcnSession::CCbsMcnSession |
|
47 // C++ default constructor can NOT contain any code, that |
|
48 // might leave. |
|
49 // ----------------------------------------------------------------------------- |
|
50 // |
|
51 CCbsRecDecoder::CCbsRecDecoder() |
|
52 { |
|
53 } |
|
54 |
|
55 // ----------------------------------------------------------------------------- |
|
56 // CCbsRecDecoder::ConstructL |
|
57 // Symbian 2nd phase constructor can leave. |
|
58 // ----------------------------------------------------------------------------- |
|
59 // |
|
60 void CCbsRecDecoder::ConstructL() |
|
61 { |
|
62 iConverter = CCnvCharacterSetConverter::NewL(); |
|
63 User::LeaveIfError( iFs.Connect() ); |
|
64 } |
|
65 |
|
66 // ----------------------------------------------------------------------------- |
|
67 // CCbsRecDecoder::NewL |
|
68 // Two-phased constructor. |
|
69 // ----------------------------------------------------------------------------- |
|
70 // |
|
71 CCbsRecDecoder* CCbsRecDecoder::NewL() |
|
72 { |
|
73 CCbsRecDecoder* self = new(ELeave) CCbsRecDecoder; |
|
74 CleanupStack::PushL( self ); |
|
75 self->ConstructL(); |
|
76 CleanupStack::Pop(); |
|
77 return self; |
|
78 } |
|
79 |
|
80 // Destructor |
|
81 CCbsRecDecoder::~CCbsRecDecoder() |
|
82 { |
|
83 CBSLOGSTRING("CBSSERVER: >>> CCbsRecDecoder::~CCbsRecDecoder()"); |
|
84 iFs.Close(); |
|
85 delete iConverter; |
|
86 CBSLOGSTRING("CBSSERVER: <<< CCbsRecDecoder::~CCbsRecDecoder()"); |
|
87 } |
|
88 |
|
89 // ----------------------------------------------------------------------------- |
|
90 // CCbsRecDecoder::DecodeL |
|
91 // Decodes 7-bit, 8-bit and 16-bit representations into UCS-2. |
|
92 // If the message has a language indication prefixed |
|
93 // in the message body, the indication is removed. |
|
94 // Compressed messages are not supported. |
|
95 // (other items were commented in a header). |
|
96 // ----------------------------------------------------------------------------- |
|
97 // |
|
98 void CCbsRecDecoder::DecodeL( |
|
99 CCbsMessage& aMessage ) |
|
100 { |
|
101 if ( aMessage.IsCompressed() ) |
|
102 { |
|
103 User::Leave( KErrNotSupported ); |
|
104 } |
|
105 |
|
106 // Convert message into plaintext. |
|
107 DoDecodeL( aMessage ); |
|
108 |
|
109 // 8-bit representation not needed anymore. |
|
110 aMessage.ReleaseEightBitRepresentation(); |
|
111 |
|
112 // Determine language of this message (from header or content), |
|
113 aMessage.ResolveLanguage(); |
|
114 |
|
115 // Remove language indication, if present, from message. |
|
116 aMessage.RemoveLanguageIndicationFromBodyL(); |
|
117 } |
|
118 |
|
119 // ----------------------------------------------------------------------------- |
|
120 // CCbsRecDecoder::DoDecodeL |
|
121 // Decodes the given message's content. |
|
122 // Decodes aMessage's 7-bit/Unicode representation |
|
123 // into internal Unicode representation. |
|
124 // (other items were commented in a header). |
|
125 // ----------------------------------------------------------------------------- |
|
126 // |
|
127 void CCbsRecDecoder::DoDecodeL( |
|
128 CCbsMessage& aMessage ) |
|
129 { |
|
130 CBSLOGSTRING("CBSSERVER: >>> CCbsRecDecoder::DoDecodeL()"); |
|
131 |
|
132 TCbsRecAlphabet alphabet( aMessage.Alphabet() ); |
|
133 if ( alphabet == ECbsRecAlphabetDefault || |
|
134 alphabet == ECbsRecAlphabetUnspecified ) |
|
135 { |
|
136 DefaultAlphabetDecodeL( aMessage ); |
|
137 } |
|
138 else if ( alphabet == ECbsRecAlphabet8bit ) |
|
139 { |
|
140 EightbitAlphabetDecodeL( aMessage ); |
|
141 } |
|
142 else |
|
143 { |
|
144 UnicodeDecodeL( aMessage ); |
|
145 } |
|
146 CBSLOGSTRING("CBSSERVER: <<< CCbsRecDecoder::DoDecodeL()"); |
|
147 } |
|
148 |
|
149 // ----------------------------------------------------------------------------- |
|
150 // CCbsRecDecoder::UnicodeDecodeL |
|
151 // Decodes 8-bit and Unicode message representations. |
|
152 // (other items were commented in a header). |
|
153 // ----------------------------------------------------------------------------- |
|
154 // |
|
155 void CCbsRecDecoder::UnicodeDecodeL( |
|
156 CCbsMessage& aMsg ) |
|
157 { |
|
158 CBSLOGSTRING("CBSSERVER: >>> CCbsRecDecoder::UnicodeDecodeL()"); |
|
159 |
|
160 TPtrC8 contents( aMsg.Contents8() ); |
|
161 |
|
162 // Reserve enough space for the actual contents plus |
|
163 // the CR key |
|
164 aMsg.ReserveContentSizeL( contents.Length()+1 ); |
|
165 |
|
166 // Check if the message is preceded with language. |
|
167 if( aMsg.DCS() == DCS_MPLI_UCS2 ) |
|
168 { |
|
169 // The language is encoded as 7-bit USSD. Unpack that |
|
170 // and add CR after the language to match the default |
|
171 // alphabet case. |
|
172 TBuf<3> language; |
|
173 language.Copy( contents.Left(2) ); |
|
174 language[1] <<= 1; |
|
175 language[1] |= (language[0] & 0x80) >> 7; |
|
176 language[0] &= 0x7f; |
|
177 language.Append( EKeyEnter ); |
|
178 aMsg.AppendContent( language ); |
|
179 |
|
180 // Skip the language indication |
|
181 contents.Set( contents.Mid(2) ); |
|
182 } |
|
183 |
|
184 // The rest of the message is UCS2 encoded Unicode. |
|
185 // Make sure the byte order is correct. |
|
186 HBufC* text = HBufC::NewL( contents.Length() / 2 ); |
|
187 CleanupStack::PushL( text ); |
|
188 |
|
189 TPtr ptr( text->Des() ); |
|
190 TInt length( contents.Length() ); |
|
191 |
|
192 // If the length is an odd number, remove the last character. |
|
193 if ( length & 0x01 ) |
|
194 { |
|
195 length -= 1; |
|
196 } |
|
197 |
|
198 for ( TInt i( 0 ); i < length; i += 2 ) |
|
199 { |
|
200 ptr.Append( ( contents[ i ] << 8 ) + contents[ i + 1 ] ); |
|
201 } |
|
202 |
|
203 aMsg.AppendContent( RemoveTrailingCR( *text ) ); |
|
204 CleanupStack::PopAndDestroy(); |
|
205 |
|
206 CBSLOGSTRING("CBSSERVER: <<< CCbsRecDecoder::UnicodeDecodeL()"); |
|
207 } |
|
208 |
|
209 // ----------------------------------------------------------------------------- |
|
210 // CCbsRecDecoder::DefaultAlphabetDecodeL |
|
211 // Decodes 7-bit message representation. |
|
212 // (other items were commented in a header). |
|
213 // ----------------------------------------------------------------------------- |
|
214 // |
|
215 void CCbsRecDecoder::DefaultAlphabetDecodeL( |
|
216 CCbsMessage& aMsg ) |
|
217 { |
|
218 CBSLOGSTRING("CBSSERVER: >>> CCbsRecDecoder::DefaultAlphabetDecodeL()"); |
|
219 |
|
220 // Check that the converter is available |
|
221 CCnvCharacterSetConverter* characterSetConverter = |
|
222 CCnvCharacterSetConverter::NewLC(); // on CS |
|
223 |
|
224 CCnvCharacterSetConverter::TAvailability availability = |
|
225 characterSetConverter->PrepareToConvertToOrFromL( |
|
226 KCharacterSetIdentifierSms7Bit, iFs ); |
|
227 |
|
228 if ( availability == CCnvCharacterSetConverter::ENotAvailable ) |
|
229 { |
|
230 User::Leave( KErrNotFound ); |
|
231 } |
|
232 |
|
233 // Allocate a buffer for the cleartext message |
|
234 TBuf8< KCbsMaxCharsInPage + 1 > realMsg; |
|
235 |
|
236 // Get a pointer to the encoded message |
|
237 TPtrC8 msgPartOfEtelMsg = aMsg.Contents8(); |
|
238 |
|
239 // Length of the cleartext message. |
|
240 TInt messageLength( ( msgPartOfEtelMsg.Length() * 8 ) / 7 ); |
|
241 |
|
242 static const TUint mask_table[ 8 ] = |
|
243 { 0x7F, 0x01,0x03,0x07,0x0F,0x1F,0x3F,0x7F }; |
|
244 TUint8 si,di; // Indexes |
|
245 TInt tmp_modulo; // Temporary; to improve efficiency |
|
246 si = 0; |
|
247 |
|
248 // The location of the current 7-bit character determines the |
|
249 // action to be taken. Only every 7th character is not divided into |
|
250 // two bytes. All other characters will have to be contructed by |
|
251 // combining bits of two consequent bytes. |
|
252 |
|
253 for ( di = 0; di < messageLength; di++ ) |
|
254 { |
|
255 TUint num2 = 0; |
|
256 tmp_modulo = di % 8; |
|
257 switch ( tmp_modulo ) |
|
258 { |
|
259 case 0: |
|
260 num2 = msgPartOfEtelMsg[ si ] & 0x7F; |
|
261 realMsg.Append( num2 ); |
|
262 break; |
|
263 case 7: |
|
264 num2 = ( msgPartOfEtelMsg[ si ] >> 1 ) & 0x7F; |
|
265 realMsg.Append( num2 ); |
|
266 si++; |
|
267 break; |
|
268 default: |
|
269 num2 = msgPartOfEtelMsg[ si ] >> ( 8 - ( tmp_modulo ) ); |
|
270 num2 &= mask_table[ tmp_modulo ]; |
|
271 num2 |= msgPartOfEtelMsg[ si + 1 ] << ( tmp_modulo ); |
|
272 num2 &= 0x7F; |
|
273 realMsg.Append( num2 ); |
|
274 si++; |
|
275 break; |
|
276 }//switch( tmp_modulo ) |
|
277 }//for |
|
278 |
|
279 TBuf16<KMaxCharsInGeneratedUnicode> generatedUnicode; |
|
280 TInt state( CCnvCharacterSetConverter::KStateDefault ); // has to be ref. |
|
281 |
|
282 // Remove all trailing control characters from the end of the Cell info msg |
|
283 TBuf8<KCbsMaxCharsInPage> cleanedMsg; |
|
284 if ( aMsg.TopicNumber() == KCellInfoTopic ) |
|
285 { |
|
286 cleanedMsg = RemoveTrailingControlChars( realMsg ); |
|
287 User::LeaveIfError( characterSetConverter->ConvertToUnicode( |
|
288 generatedUnicode, cleanedMsg, state ) ); |
|
289 } |
|
290 else |
|
291 { |
|
292 User::LeaveIfError( characterSetConverter->ConvertToUnicode( |
|
293 generatedUnicode, realMsg, state ) ); |
|
294 } |
|
295 |
|
296 CleanupStack::PopAndDestroy(); // characterSetConverter |
|
297 |
|
298 aMsg.ReserveContentSizeL( messageLength ); |
|
299 aMsg.AppendContent( RemoveTrailingCR( generatedUnicode ) ); |
|
300 |
|
301 CBSLOGSTRING("CBSSERVER: <<< CCbsRecDecoder::DefaultAlphabetDecodeL()"); |
|
302 } |
|
303 |
|
304 // ----------------------------------------------------------------------------- |
|
305 // CCbsRecDecoder::EightbitAlphabetDecodeL |
|
306 // Decodes 8-bit message representation. |
|
307 // (other items were commented in a header). |
|
308 // ----------------------------------------------------------------------------- |
|
309 // |
|
310 void CCbsRecDecoder::EightbitAlphabetDecodeL( |
|
311 CCbsMessage& aMsg ) |
|
312 { |
|
313 CBSLOGSTRING("CBSSERVER: >>> CCbsRecDecoder::EightbitAlphabetDecodeL()"); |
|
314 |
|
315 // Copy 8-bit representation to 16-bit |
|
316 HBufC* hbuf = HBufC::NewL( aMsg.Contents8().Length() ); |
|
317 CleanupStack::PushL( hbuf ); |
|
318 |
|
319 TPtr16 ptr16 = hbuf->Des(); |
|
320 ptr16.Copy( aMsg.Contents8() ); |
|
321 |
|
322 // Reserve enough space for the actual contents |
|
323 aMsg.ReserveContentSizeL( aMsg.Contents8().Length() ); |
|
324 aMsg.AppendContent( RemoveTrailingCR( *hbuf ) ); |
|
325 |
|
326 CleanupStack::PopAndDestroy( hbuf ); |
|
327 |
|
328 CBSLOGSTRING("CBSSERVER: <<< CCbsRecDecoder::EightbitAlphabetDecodeL()"); |
|
329 } |
|
330 |
|
331 // ----------------------------------------------------------------------------- |
|
332 // CCbsRecDecoder::RemoveTrailingCR |
|
333 // Removes the trailing CRs from a message. |
|
334 // (other items were commented in a header). |
|
335 // ----------------------------------------------------------------------------- |
|
336 // |
|
337 TPtrC CCbsRecDecoder::RemoveTrailingCR( |
|
338 const TDesC& aText ) |
|
339 { |
|
340 TInt i( aText.Length() ); |
|
341 for ( ; i > 0 && aText[ i - 1 ] == EKeyEnter; i-- ) |
|
342 { |
|
343 // nothing |
|
344 } |
|
345 |
|
346 return aText.Left( i ); |
|
347 } |
|
348 |
|
349 // ----------------------------------------------------------------------------- |
|
350 // CCbsRecDecoder::RemoveTrailingControlChars |
|
351 // Removes the trailing control characters from a message. |
|
352 // (other items were commented in a header). |
|
353 // ----------------------------------------------------------------------------- |
|
354 // |
|
355 TPtrC8 CCbsRecDecoder::RemoveTrailingControlChars( |
|
356 const TDesC8& aText ) |
|
357 { |
|
358 TInt i( aText.Length() ); |
|
359 for ( ; i > 0 && ( aText[ i - 1 ] == EKeyEnter || aText[ i - 1 ] == EKeyLineFeed ); i-- ) |
|
360 { |
|
361 // nothing |
|
362 } |
|
363 |
|
364 return aText.Left( i ); |
|
365 } |
|
366 |
|
367 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
|
368 // End of File |
|