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1 // Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // Name : CSIPPreParser.cpp |
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15 // Part of : SIP Codec |
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16 // Version : SIP/4.0 |
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17 // |
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18 |
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19 |
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20 |
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21 |
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22 #include "CSIPPreParser.h" |
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23 #include "CSIPHeaderNameValue.h" |
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24 #include "sipcodecerr.h" |
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25 |
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26 _LIT8 (KCRLFCRLF, "\r\n\r\n"); |
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27 _LIT8 (KCRCRLF, "\r\r\n"); |
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28 _LIT8 (KLFCRLF, "\n\r\n"); |
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29 |
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30 // ----------------------------------------------------------------------------- |
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31 // CSIPPreParser::NewL |
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32 // ----------------------------------------------------------------------------- |
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33 // |
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34 CSIPPreParser* CSIPPreParser::NewL (HBufC8* aSipMessageBuf) |
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35 { |
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36 CSIPPreParser* self= CSIPPreParser::NewLC (aSipMessageBuf); |
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37 CleanupStack::Pop(self); |
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38 return self; |
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39 } |
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40 |
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41 // ----------------------------------------------------------------------------- |
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42 // CSIPPreParser::NewLC |
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43 // ----------------------------------------------------------------------------- |
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44 // |
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45 CSIPPreParser* CSIPPreParser::NewLC (HBufC8* aSipMessageBuf) |
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46 { |
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47 __ASSERT_ALWAYS (aSipMessageBuf!=0, User::Leave(KErrSipCodecPreParser)); |
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48 __ASSERT_ALWAYS (aSipMessageBuf->Length()>0, User::Leave(KErrSipCodecPreParser)); |
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49 |
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50 CSIPPreParser* self= new(ELeave)CSIPPreParser (*aSipMessageBuf); |
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51 CleanupStack::PushL(self); |
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52 self->ConstructL(aSipMessageBuf); |
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53 return self; |
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54 } |
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55 |
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56 // ----------------------------------------------------------------------------- |
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57 // CSIPPreParser::CSIPPreParser |
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58 // ----------------------------------------------------------------------------- |
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59 // |
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60 CSIPPreParser::CSIPPreParser (const TDesC8& aSipMessageDes) |
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61 : iLexBuf(aSipMessageDes) |
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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 // CSIPPreParser::ConstructL |
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67 // ----------------------------------------------------------------------------- |
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68 // |
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69 void CSIPPreParser::ConstructL (HBufC8* aSipMessageBuf) |
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70 { |
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71 CreateHeaderBufL (*aSipMessageBuf); |
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72 ParseL (); |
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73 // aSipMessageBuf ownership taken only after the pre-parsing has succeeded. |
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74 iSipMessageBuf = aSipMessageBuf; |
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75 } |
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76 |
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77 // ----------------------------------------------------------------------------- |
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78 // CSIPPreParser::~CSIPPreParser |
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79 // ----------------------------------------------------------------------------- |
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80 // |
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81 CSIPPreParser::~CSIPPreParser () |
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82 { |
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83 iHeaderStartArray.Close(); |
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84 delete iHeaderBuf; |
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85 delete iSipMessageBuf; |
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86 } |
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87 |
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88 // ----------------------------------------------------------------------------- |
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89 // CSIPPreParser::ParseL |
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90 // ----------------------------------------------------------------------------- |
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91 // |
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92 void CSIPPreParser::ParseL () |
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93 { |
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94 TChar chr = GetCharL(); |
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95 while (chr == ' ' || chr == '\t' || chr == '\r' || chr == '\n') |
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96 { |
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97 chr = GetCharL(); |
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98 } |
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99 |
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100 TBool headerPartEnds = EFalse; |
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101 while (!headerPartEnds) |
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102 { |
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103 switch (chr) |
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104 { |
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105 case '\n': headerPartEnds = HandleLfL(); break; |
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106 case '\r': headerPartEnds = HandleCrL(); break; |
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107 default: iHeaderBuf->Des().Append(chr); break; |
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108 } |
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109 if (!headerPartEnds) |
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110 { |
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111 chr = GetChar(); |
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112 } |
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113 } |
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114 } |
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115 |
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116 // ----------------------------------------------------------------------------- |
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117 // CSIPPreParser::FirstLineL |
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118 // ----------------------------------------------------------------------------- |
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119 // |
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120 TPtrC8 CSIPPreParser::FirstLineL () |
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121 { |
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122 // The first line of any SIP message is a request line or a status line. |
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123 TPtrC8 firstLine(GetLineL(0)); |
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124 return firstLine; |
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125 } |
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126 |
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127 // ----------------------------------------------------------------------------- |
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128 // CSIPPreParser::ContentL |
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129 // ----------------------------------------------------------------------------- |
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130 // |
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131 HBufC8* CSIPPreParser::ContentL () |
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132 { |
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133 // The ownership of the content is given to the caller. |
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134 // The function is not re-entrant. Content can be only asked once. |
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135 // The purpose of this is to avoid unnecessary copying. |
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136 __ASSERT_ALWAYS (iSipMessageBuf != 0, User::Leave (KErrSipCodecPreParser)); |
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137 |
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138 // Delete the header part from the original SIP message. "Delete" does not |
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139 // free any memory. It just changes the starting position of the descriptor |
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140 // in the original buffer. |
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141 TInt originalLength = iSipMessageBuf->Length(); |
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142 iSipMessageBuf->Des().Delete (0, iOriginalHeaderPartLength); |
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143 TInt contentLength = originalLength - iOriginalHeaderPartLength; |
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144 |
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145 // With relatively big content parts try to avoid unnecessary copying. |
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146 HBufC8* content = NULL; |
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147 if (contentLength < iOriginalHeaderPartLength) |
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148 { |
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149 // Relatively small content part. Make a copy. See HBufC8::ReAllocL. |
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150 content = iSipMessageBuf->ReAllocL (contentLength); |
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151 } |
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152 else |
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153 { |
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154 // Relatively big content part. Do not copy into smaller buffer. |
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155 content = iSipMessageBuf; |
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156 } |
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157 iSipMessageBuf = 0; |
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158 return content; |
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159 } |
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160 |
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161 // ----------------------------------------------------------------------------- |
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162 // CSIPPreParser::HeaderCount |
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163 // ----------------------------------------------------------------------------- |
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164 // |
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165 TUint CSIPPreParser::HeaderCount () |
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166 { |
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167 return iHeaderStartArray.Count(); |
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168 } |
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169 |
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170 // ----------------------------------------------------------------------------- |
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171 // CSIPPreParser::ParseNameValueL |
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172 // ----------------------------------------------------------------------------- |
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173 // |
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174 CSIPHeaderNameValue* CSIPPreParser::ParseNameValueL (TInt aIndex) |
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175 { |
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176 __ASSERT_ALWAYS (aIndex < iHeaderStartArray.Count(), |
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177 User::Leave(KErrSipCodecPreParser)); |
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178 |
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179 TUint lineStartPos = iHeaderStartArray[aIndex]; |
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180 TPtrC8 line (GetLineL(lineStartPos)); |
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181 TInt colonPos = line.Locate (':'); // find the first colon |
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182 |
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183 __ASSERT_ALWAYS (colonPos > 0, User::Leave(KErrSipCodecPreParser)); |
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184 |
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185 TPtrC8 name(line.Left(colonPos)); |
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186 TPtrC8 value(line.Mid(colonPos+1)); |
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187 |
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188 return CSIPHeaderNameValue::NewL(name, value); |
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189 } |
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190 |
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191 // ----------------------------------------------------------------------------- |
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192 // CSIPPreParser::GetLineL |
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193 // ----------------------------------------------------------------------------- |
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194 // |
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195 TPtrC8 CSIPPreParser::GetLineL (TInt aLineStartPosition) |
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196 { |
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197 __ASSERT_ALWAYS (aLineStartPosition < iHeaderBuf->Length(), |
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198 User::Leave(KErrSipCodecPreParser)); |
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199 |
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200 TPtrC8 lineStartBuf (iHeaderBuf->Des().Mid (aLineStartPosition)); |
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201 |
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202 // All the line ends (CR,LF or CRLF) have been replaced by LF. |
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203 TInt lineEndPosition = lineStartBuf.Locate('\n'); |
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204 |
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205 __ASSERT_ALWAYS (lineEndPosition > 0, User::Leave (KErrSipCodecPreParser)); |
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206 |
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207 return lineStartBuf.Left(lineEndPosition); |
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208 } |
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209 |
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210 // ----------------------------------------------------------------------------- |
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211 // CSIPPreParser::CreateHeaderBufL |
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212 // ----------------------------------------------------------------------------- |
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213 // |
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214 void CSIPPreParser::CreateHeaderBufL (const TDesC8& aSipMessageDes) |
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215 { |
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216 TLex8 lex(aSipMessageDes); |
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217 lex.SkipSpace(); |
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218 TInt headerPartEndPosition = 0; |
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219 FindHeaderPartEndPositionL (lex.Remainder(),headerPartEndPosition); |
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220 if (headerPartEndPosition <= 0) |
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221 { |
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222 User::Leave (KErrSipCodecPreParser); |
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223 } |
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224 iHeaderBuf = HBufC8::NewL(headerPartEndPosition+1); |
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225 } |
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226 |
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227 // ----------------------------------------------------------------------------- |
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228 // CSIPPreParser::FindHeaderPartEndPositionL |
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229 // ----------------------------------------------------------------------------- |
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230 // |
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231 void CSIPPreParser::FindHeaderPartEndPositionL ( |
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232 const TDesC8& aSipMessageDes, |
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233 TInt& aPosition) |
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234 { |
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235 // The header part may end only with CRLFCRLF, CRCRLF or LFCRLF |
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236 RArray<TInt> positions; |
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237 CleanupClosePushL(positions); |
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238 |
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239 // CRLFCRLF |
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240 TInt CrLfCrLfPos = aSipMessageDes.Find(KCRLFCRLF); |
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241 if (CrLfCrLfPos >= 0) |
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242 { |
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243 User::LeaveIfError(positions.Append(CrLfCrLfPos)); |
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244 } |
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245 |
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246 // CRCRLF |
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247 TInt CrCrLfPos = aSipMessageDes.Find(KCRCRLF); |
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248 if (CrCrLfPos >= 0) |
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249 { |
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250 User::LeaveIfError(positions.InsertInOrder(CrCrLfPos)); |
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251 } |
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252 |
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253 // LFCRLF |
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254 TInt LfCrLfPos = aSipMessageDes.Find(KLFCRLF); |
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255 if (LfCrLfPos >= 0) |
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256 { |
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257 User::LeaveIfError(positions.InsertInOrder(LfCrLfPos)); |
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258 } |
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259 |
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260 if (positions.Count() == 0) |
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261 { |
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262 User::Leave(KErrNotFound); |
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263 } |
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264 |
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265 aPosition = positions[0]; |
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266 CleanupStack::PopAndDestroy(); // positions |
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267 } |
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268 |
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269 // ----------------------------------------------------------------------------- |
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270 // CSIPPreParser::HandleLfL |
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271 // ----------------------------------------------------------------------------- |
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272 // |
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273 TBool CSIPPreParser::HandleLfL () |
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274 { |
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275 TChar chr = GetCharL (); |
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276 switch (chr) |
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277 { |
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278 case ' ' : // LFSP |
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279 case '\t': // LFHTAB |
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280 // The header continues on the next line. |
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281 SkipSpacesAndTabsL (); |
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282 iHeaderBuf->Des().Append(' '); // replace by one space |
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283 break; |
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284 |
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285 case '\r': // LFCR |
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286 chr = GetCharL (); |
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287 if (chr == '\n') // LFCRLF |
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288 { |
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289 // Header part ends according to the old SIP specs. |
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290 // Replace LFCRLF with LF to simplify name-value parsing. |
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291 iHeaderBuf->Des().Append('\n'); |
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292 return ETrue; |
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293 } |
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294 else // LFCR"AnyText" not allowed. |
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295 { |
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296 User::Leave (KErrSipCodecPreParser); |
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297 } |
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298 |
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299 case '\n': // LFLF not allowed. |
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300 User::Leave (KErrSipCodecPreParser); |
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301 |
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302 default: // LF"AnyText" |
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303 MoveToNextLineL (); |
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304 break; |
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305 } |
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306 return EFalse; |
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307 } |
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308 |
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309 // ----------------------------------------------------------------------------- |
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310 // CSIPPreParser::HandleCrL |
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311 // ----------------------------------------------------------------------------- |
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312 // |
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313 TBool CSIPPreParser::HandleCrL () |
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314 { |
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315 TChar chr = GetCharL (); |
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316 switch (chr) |
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317 { |
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318 case ' ' : // CRSP |
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319 case '\t': // CRHTAB |
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320 // The header continues on the next line. |
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321 SkipSpacesAndTabsL (); |
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322 iHeaderBuf->Des().Append(' '); // replace by one space |
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323 break; |
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324 |
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325 case '\r': // CRCR |
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326 chr = GetCharL (); |
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327 if (chr == '\n') // CRCRLF |
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328 { |
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329 // Header part ends according to the old SIP specs. |
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330 // Replace CRCRLF with LF to simplify name-value parsing. |
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331 iHeaderBuf->Des().Append('\n'); |
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332 return ETrue; |
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333 } |
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334 else // CRCR"AnyText" not allowed. |
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335 { |
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336 User::Leave (KErrSipCodecPreParser); |
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337 } |
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338 |
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339 case '\n': // CRLF |
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340 chr = GetCharL (); |
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341 switch (chr) |
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342 { |
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343 case '\n': // CRLFLF not allowed. |
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344 User::Leave (KErrSipCodecPreParser); |
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345 |
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346 case ' ' : case '\t': // CRLFSP or CRLFHTAB |
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347 // The header continues on the next line. |
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348 SkipSpacesAndTabsL (); |
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349 iHeaderBuf->Des().Append(' '); // replace by one space |
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350 break; |
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351 |
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352 case '\r': // CRLFCR |
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353 chr = GetCharL (); |
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354 if (chr == '\n') // CRLFCRLF. Header part ends. |
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355 { |
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356 // Replace with LF to simplify name-value parsing. |
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357 iHeaderBuf->Des().Append('\n'); |
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358 return ETrue; |
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359 } |
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360 else // CRLFCR"AnyText" not allowed. |
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361 { |
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362 User::Leave (KErrSipCodecPreParser); |
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363 } |
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364 |
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365 default: // CRLF"AnyText" |
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366 MoveToNextLineL (); |
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367 break; |
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368 } |
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369 break; |
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370 |
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371 default: // CR"AnyText" |
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372 MoveToNextLineL (); |
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373 break; |
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374 } |
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375 return EFalse; |
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376 } |
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377 |
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378 // ----------------------------------------------------------------------------- |
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379 // CSIPPreParser::SkipSpacesAndTabsL |
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380 // ----------------------------------------------------------------------------- |
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381 // |
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382 void CSIPPreParser::SkipSpacesAndTabsL () |
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383 { |
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384 TChar chr = GetCharL (); |
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385 while (chr == ' ' || chr == '\t') |
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386 { |
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387 chr = GetCharL(); |
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388 } |
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389 UnGetChar(); // Put back the last one that was not a space or a tab |
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390 } |
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391 |
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392 // ----------------------------------------------------------------------------- |
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393 // CSIPPreParser::MoveToNextLineL |
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394 // ----------------------------------------------------------------------------- |
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395 // |
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396 void CSIPPreParser::MoveToNextLineL () |
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397 { |
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398 UnGetChar(); |
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399 // Replace the line end (CR, LF or CRLF) with LF |
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400 iHeaderBuf->Des().Append('\n'); |
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401 TUint nextLineStartPosition = iHeaderBuf->Length(); |
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402 User::LeaveIfError (iHeaderStartArray.Append(nextLineStartPosition)); |
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403 } |
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404 |
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405 // ----------------------------------------------------------------------------- |
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406 // CSIPPreParser::GetCharL |
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407 // ----------------------------------------------------------------------------- |
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408 // |
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409 inline TChar CSIPPreParser::GetCharL() |
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410 { |
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411 TChar chr = GetChar(); |
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412 if (chr == 0) |
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413 { |
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414 User::Leave (KErrSipCodecPreParser); |
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415 } |
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416 return chr; |
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417 } |
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418 |
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419 // ----------------------------------------------------------------------------- |
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420 // CSIPPreParser::GetChar |
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421 // ----------------------------------------------------------------------------- |
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422 // |
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423 inline TChar CSIPPreParser::GetChar() |
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424 { |
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425 TChar chr = iLexBuf.Get(); |
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426 if (chr != 0) iOriginalHeaderPartLength++; |
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427 return chr; |
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428 } |
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429 |
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430 // ----------------------------------------------------------------------------- |
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431 // CSIPPreParser::UnGetChar |
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432 // ----------------------------------------------------------------------------- |
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433 // |
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434 inline void CSIPPreParser::UnGetChar() |
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435 { |
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436 iLexBuf.UnGet(); |
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437 iOriginalHeaderPartLength--; |
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438 } |