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1 /** @file |
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2 * Copyright (c) 2005-2006 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: Declares chunk parsing class. |
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15 * |
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16 */ |
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17 |
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18 |
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19 // INCLUDE FILES |
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20 #include "upnphttpchunkparser.h" |
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21 #include "upnpcons.h" |
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22 |
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23 |
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24 // CONSTANTS |
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25 |
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26 // ============================ MEMBER FUNCTIONS =============================== |
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27 |
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28 // ----------------------------------------------------------------------------- |
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29 // CUpnpHttpChunkParser::NewL |
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30 // Two-phased constructor |
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31 // ----------------------------------------------------------------------------- |
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32 // |
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33 CUpnpHttpChunkParser* CUpnpHttpChunkParser::NewL() |
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34 { |
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35 |
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36 CUpnpHttpChunkParser* self = new (ELeave) CUpnpHttpChunkParser(); |
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37 CleanupStack::PushL( self ); |
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38 self->ConstructL(); |
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39 CleanupStack::Pop( self ); |
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40 |
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41 return self; |
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42 } |
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43 |
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44 // ----------------------------------------------------------------------------- |
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45 // CUpnpHttpChunkParser::~CUpnpHttpChunkParser |
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46 // C++ default destructor |
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47 // ----------------------------------------------------------------------------- |
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48 // |
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49 CUpnpHttpChunkParser::~CUpnpHttpChunkParser() |
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50 { |
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51 } |
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52 |
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53 // ----------------------------------------------------------------------------- |
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54 // CUpnpHttpChunkParser::CUpnpHttpChunkParser |
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55 // C++ default constructor |
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56 // ----------------------------------------------------------------------------- |
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57 // |
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58 CUpnpHttpChunkParser::CUpnpHttpChunkParser() |
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59 :iContext(EUnknown), |
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60 iChunkSize(KErrNotFound), |
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61 iError (KErrNone) |
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62 { |
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63 } |
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64 |
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65 // ----------------------------------------------------------------------------- |
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66 // CUpnpHttpChunkParser::ConstructL |
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67 // Two-phased constructor |
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68 // ----------------------------------------------------------------------------- |
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69 // |
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70 void CUpnpHttpChunkParser::ConstructL() |
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71 { |
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72 } |
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73 |
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74 // ----------------------------------------------------------------------------- |
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75 // CUpnpHttpChunkParser::Reset |
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76 // Checks if decoding ended |
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77 // ----------------------------------------------------------------------------- |
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78 // |
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79 void CUpnpHttpChunkParser::Reset() |
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80 { |
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81 iContext = EUnknown; |
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82 iError = KErrNone; |
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83 iChunkSize = KErrNotFound; |
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84 } |
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85 |
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86 // ----------------------------------------------------------------------------- |
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87 // CUpnpHttpChunkParser::SetErrorState |
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88 // ----------------------------------------------------------------------------- |
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89 // |
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90 void CUpnpHttpChunkParser::SetErrorState() |
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91 { |
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92 iError = EHttpRequestTimeout; |
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93 iContext = EError; |
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94 } |
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95 |
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96 // ----------------------------------------------------------------------------- |
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97 // CUpnpHttpChunkParser::Parse |
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98 // Decoding the chunked-encoded buffer |
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99 // ----------------------------------------------------------------------------- |
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100 // |
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101 TInt CUpnpHttpChunkParser::Parse(TDes8& aBuffer, TInt& aPos) |
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102 { |
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103 TBool interrupt = EFalse; |
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104 while(!interrupt) |
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105 { |
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106 switch(iContext) |
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107 { |
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108 case EUnknown: |
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109 iContext = EHeader; |
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110 case EHeader: |
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111 interrupt = ParseHeader(aBuffer,aPos); |
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112 break; |
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113 case ELastChunk: |
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114 interrupt = ParseLastChunk(aBuffer,aPos); |
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115 break; |
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116 case EBody: |
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117 interrupt = ParseBody(aBuffer,aPos); |
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118 break; |
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119 case EEndChunkBody: |
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120 iContext = EHeader; |
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121 break; |
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122 case EExtension: |
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123 interrupt = ParseExtension(aBuffer,aPos); |
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124 break; |
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125 case ETrailer: |
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126 interrupt = ParseTrailer(aBuffer,aPos); |
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127 break; |
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128 case EError: |
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129 return iError; |
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130 case EFinish: |
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131 return KErrNone; |
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132 default: |
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133 return KErrUnknown; |
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134 } |
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135 } |
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136 return KErrNone; |
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137 } |
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138 // ----------------------------------------------------------------------------- |
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139 // CUpnpHttpChunkParser::ParseL |
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140 // Decoding the chunked-encoded buffer |
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141 // ----------------------------------------------------------------------------- |
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142 // |
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143 TBool CUpnpHttpChunkParser::ParseBody( TDes8& aBuffer, TInt& aPos ) |
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144 { |
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145 if ( IsEmpty( aBuffer, aPos ) ) |
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146 { |
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147 return ETrue; |
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148 } |
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149 |
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150 TPtrC8 pointer( aBuffer.Right( aBuffer.Length() - aPos ) ); |
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151 |
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152 if ( iBytesAppended + pointer.Length() >= iChunkSize ) |
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153 { |
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154 aPos += ( iChunkSize - iBytesAppended ); |
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155 pointer.Set( aBuffer.Right( aBuffer.Length() - aPos ) ); |
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156 TInt lineFeed = pointer.FindF(UpnpString::KLineFeed()); |
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157 //linefeed found |
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158 if ( !lineFeed ) |
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159 { |
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160 aBuffer.Delete( aPos, UpnpString::KLineFeed().Length() ); |
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161 iContext = EEndChunkBody; |
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162 return ( aPos == aBuffer.Length() ); |
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163 } |
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164 //linefeed not found, end of buffer |
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165 else if ( lineFeed == KErrNotFound && |
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166 ( ( aPos + UpnpString::KLineFeed().Length() ) > aBuffer.Length() ) |
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167 ) |
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168 { |
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169 iBytesAppended = iChunkSize; |
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170 return ETrue; |
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171 } |
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172 //size doesn't comply with the header value |
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173 iError = KErrGeneral; |
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174 iContext = EError; |
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175 return EFalse; |
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176 } |
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177 else |
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178 { |
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179 iBytesAppended += pointer.Length(); |
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180 aPos = aBuffer.Length(); |
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181 return ETrue; |
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182 } |
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183 } |
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184 // ----------------------------------------------------------------------------- |
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185 // CUpnpHttpChunkParser::ParseL |
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186 // Decoding the chunked-encoded buffer |
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187 // ----------------------------------------------------------------------------- |
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188 // |
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189 TBool CUpnpHttpChunkParser::ParseHeader( TDes8& aBuffer, TInt& aPos ) |
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190 { |
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191 if ( IsEmpty( aBuffer, aPos ) ) |
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192 { |
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193 return ETrue; |
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194 } |
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195 iChunkSize = KErrNotFound; |
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196 iBytesAppended = 0; |
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197 TPtrC8 pointer(NULL,0); |
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198 //if '\r\n' exists |
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199 TInt lineFeed = aBuffer.Right( aBuffer.Length() - aPos ).FindF( UpnpString::KLineFeed ); |
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200 //if ';' exists |
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201 TInt semiColon = aBuffer.Right( aBuffer.Length() - aPos ).FindF( UpnpString::KSemiColon ); |
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202 //semicolon ignored if occurs after the linefeed |
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203 if ( semiColon !=KErrNotFound && lineFeed !=KErrNotFound && lineFeed<semiColon ) |
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204 { |
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205 semiColon = KErrNotFound; |
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206 } |
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207 if ( semiColon !=KErrNotFound ) |
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208 { |
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209 pointer.Set(aBuffer.Right( aBuffer.Length() - aPos ).Mid( 0,semiColon ) ); |
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210 } |
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211 else if ( lineFeed !=KErrNotFound ) |
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212 { |
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213 pointer.Set( aBuffer.Right( aBuffer.Length() - aPos ).Mid( 0,lineFeed ) ); |
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214 } |
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215 else |
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216 { |
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217 pointer.Set( aBuffer.Right( aBuffer.Length() - aPos ) ); |
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218 } |
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219 |
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220 TLex8 lex( pointer ); |
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221 //skip white spaces |
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222 lex.SkipSpace(); |
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223 TUint size; |
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224 //neither semicolon nor linefeed found |
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225 if ( lineFeed == KErrNotFound && semiColon == KErrNotFound ) |
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226 { |
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227 //remember the num of cut spaces |
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228 TInt len = lex.Offset(); |
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229 if ( !lex.Eos() ) |
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230 { |
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231 //check the chunk header size for the limit |
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232 TInt error = lex.Val( size, EHex ); |
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233 if ( error!= KErrNone || size > KMaxTInt ) |
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234 { |
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235 //size too big |
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236 iError = ( error ) ? error: EHttpInsufficientStorage; |
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237 iContext = EError; |
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238 return EFalse; |
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239 } |
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240 } |
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241 |
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242 aBuffer.Delete( aPos,len ); |
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243 return ETrue; |
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244 } |
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245 |
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246 //get size |
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247 TInt error = lex.Val( size, EHex ); |
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248 if ( error!= KErrNone || size > KMaxTInt ) |
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249 { |
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250 //unexpected characters or size too big |
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251 iError = ( error ) ? error: EHttpInsufficientStorage ; |
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252 iContext = EError; |
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253 return EFalse; |
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254 } |
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255 iChunkSize = size; |
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256 //skip white spaces |
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257 lex.SkipSpace(); |
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258 if ( !lex.Eos() ) |
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259 { |
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260 //unexpected characters |
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261 iError = KErrGeneral; |
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262 iContext = EError; |
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263 return EFalse; |
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264 } |
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265 if ( lineFeed != KErrNotFound ) |
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266 { |
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267 //the whole chunk header is parsed |
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268 aBuffer.Delete( aPos, lineFeed + UpnpString::KLineFeed().Length() ); |
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269 //chunk size == 0 |
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270 if ( !iChunkSize ) |
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271 { |
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272 iContext = ELastChunk; |
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273 } |
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274 else |
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275 { |
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276 iContext = EBody; |
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277 } |
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278 return ( aPos == aBuffer.Length() ); |
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279 } |
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280 else if ( semiColon != KErrNotFound ) |
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281 { |
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282 //extension found, |
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283 //one character left - possible linefeed |
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284 if ( aPos<aBuffer.Length() ) |
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285 { |
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286 aBuffer.Delete( aPos, aBuffer.Length() - aPos - 1 ); |
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287 } |
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288 iContext = EExtension; |
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289 return ETrue; |
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290 } |
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291 |
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292 iError = KErrUnknown; |
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293 iContext = EError; |
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294 return EFalse; |
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295 } |
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296 // ----------------------------------------------------------------------------- |
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297 // CUpnpHttpChunkParser::ParseL |
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298 // Decoding the chunked-encoded buffer |
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299 // ----------------------------------------------------------------------------- |
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300 // |
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301 TBool CUpnpHttpChunkParser::ParseExtension( TDes8& aBuffer, TInt& aPos ) |
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302 { |
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303 if ( IsEmpty( aBuffer, aPos ) ) |
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304 { |
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305 return ETrue; |
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306 } |
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307 |
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308 //if '\r\n' exists |
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309 TInt lineFeed = aBuffer.Right( aBuffer.Length() - aPos ).FindF( UpnpString::KLineFeed ); |
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310 if ( lineFeed != KErrNotFound ) |
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311 { |
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312 aBuffer.Delete( aPos, lineFeed + UpnpString::KLineFeed().Length() ); |
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313 if ( !iChunkSize ) |
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314 { |
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315 iContext = ETrailer; |
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316 return EFalse; |
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317 } |
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318 else |
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319 { |
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320 iContext = EBody; |
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321 return EFalse; |
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322 } |
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323 } |
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324 else |
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325 { |
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326 //one character left - possible linefeed |
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327 if ( aPos + 1 < aBuffer.Length() ) |
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328 { |
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329 aBuffer.Delete( aPos, aBuffer.Length() - aPos - 1 ); |
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330 } |
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331 return ETrue; |
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332 } |
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333 } |
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334 // ----------------------------------------------------------------------------- |
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335 // CUpnpHttpChunkParser::ParseL |
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336 // Decoding the chunked-encoded buffer |
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337 // ----------------------------------------------------------------------------- |
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338 // |
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339 TBool CUpnpHttpChunkParser::ParseLastChunk( TDes8& aBuffer, TInt& aPos ) |
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340 { |
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341 //if empty or only one character present |
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342 if ( (aBuffer.Length() - aPos) < UpnpString::KLineFeedLength ) |
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343 { |
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344 return ETrue; |
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345 } |
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346 //if '\r\n' exists |
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347 TInt lineFeed = aBuffer.Right( aBuffer.Length() - aPos ).FindF( UpnpString::KLineFeed ); |
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348 if ( !lineFeed ) |
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349 { |
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350 aBuffer.Delete( aPos, lineFeed + UpnpString::KLineFeed().Length() ); |
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351 iContext = EFinish; |
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352 return ETrue; |
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353 } |
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354 else |
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355 { |
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356 iContext = ETrailer; |
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357 return EFalse; |
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358 } |
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359 |
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360 } |
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361 // ----------------------------------------------------------------------------- |
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362 // CUpnpHttpChunkParser::ParseL |
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363 // Decoding the chunked-encoded buffer |
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364 // ----------------------------------------------------------------------------- |
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365 // |
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366 TBool CUpnpHttpChunkParser::ParseTrailer( TDes8& aBuffer, TInt& aPos ) |
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367 { |
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368 if ( IsEmpty( aBuffer, aPos ) ) |
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369 { |
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370 return ETrue; |
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371 } |
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372 //if double '\r\n' exists |
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373 TInt doublelineFeed = aBuffer.Right( aBuffer.Length() - aPos ).FindF( UpnpString::KDoubleLineFeed ); |
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374 if (doublelineFeed != KErrNotFound ) |
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375 { |
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376 aBuffer.Delete( aPos, doublelineFeed + UpnpString::KDoubleLineFeed().Length() ); |
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377 iContext = EFinish; |
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378 return ETrue; |
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379 } |
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380 else |
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381 { |
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382 //waiting,3 characters reserved for double linefeed |
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383 if ( aPos + UpnpString::KCRLFCRLength < aBuffer.Length() ) |
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384 { |
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385 aBuffer.Delete( aPos, aBuffer.Length() - aPos - UpnpString::KCRLFCRLength ); |
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386 } |
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387 return ETrue; |
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388 } |
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389 } |
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390 |
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391 // ----------------------------------------------------------------------------- |
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392 // CUpnpHttpChunkParser::IsEmpty |
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393 // Decoding the chunked-encoded buffer |
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394 // ----------------------------------------------------------------------------- |
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395 // |
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396 TBool CUpnpHttpChunkParser::IsEmpty( TDes8& aBuffer, TInt aPos ) |
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397 { |
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398 return ( aPos >= aBuffer.Length() ); |
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399 } |
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400 |
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401 // ----------------------------------------------------------------------------- |
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402 // CUpnpHttpChunkParser::IsFinished |
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403 // Checks if decoding ended |
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404 // ----------------------------------------------------------------------------- |
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405 // |
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406 TBool CUpnpHttpChunkParser::IsFinished() |
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407 { |
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408 return ( iContext==EFinish ); |
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409 } |
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410 |
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411 |
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412 // End Of File |