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