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1 // Copyright (c) 2005-2009 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 // |
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15 |
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16 /** |
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17 @file |
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18 @internalComponent |
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19 */ |
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20 |
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21 #include <bluetooth/logger.h> |
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22 #include <es_sock.h> |
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23 #include "avctppacket.h" |
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24 #include "avctpcommon.h" |
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25 #include "avctpmuxer.h" |
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26 #include "avctputils.h" |
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27 #include "avctpconstants.h" |
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28 |
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29 #ifdef __FLOG_ACTIVE |
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30 _LIT8(KLogComponent, LOG_COMPONENT_AVCTP); |
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31 #endif |
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32 |
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33 #ifdef _DEBUG |
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34 PANICCATEGORY("avctppkt"); |
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35 #endif |
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36 |
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37 using namespace SymbianAvctp; |
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38 |
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39 /*static*/ TPtrC8 CAvctpPacket::GetHeader(const RMBufChain& aChain) |
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40 { |
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41 const RMBuf* mbuf = aChain.First(); |
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42 // set the descriptor to read out the whole of the first mbuf (into which the header fits) |
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43 return TPtrC8(mbuf->Ptr(), mbuf->Length()); |
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44 } |
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45 |
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46 |
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47 /** |
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48 Fills in the TAvctpHeaderInfo |
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49 |
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50 This function takes a TAvctpStartHeaderInfo rather than a TAvctpHeaderInfo to |
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51 avoid problems with casting from TAvctpHeaderInfo to TAvctpStartHeaderInfo & |
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52 mangling data. |
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53 |
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54 @internalComponent |
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55 @param aData The data buffer that contains the AVCTP packet to be parsed |
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56 @param aHeaderInfo will contain the result of the parsing. |
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57 @return KErrNone if there was no problem parsing the header, otherwise returns an |
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58 Avctp specific error. |
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59 */ |
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60 /*static*/ TInt CAvctpPacket::ParseHeader(const RMBufChain& aData, TAvctpStartHeaderInfo& aHeaderInfo) |
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61 { |
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62 LOG_STATIC_FUNC |
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63 |
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64 TInt err = KErrNone; |
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65 |
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66 // We require the packet to be long enough to at least contain the packet type |
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67 const TPtrC8 dataP(GetHeader(aData)); |
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68 |
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69 if (dataP.Length() < EMinimumHeaderLength) |
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70 { |
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71 err = KErrPacketTooShort; |
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72 } |
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73 |
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74 if (err == KErrNone) |
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75 { |
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76 aHeaderInfo.iMsgType = SymbianAvctp::MessageType(dataP); |
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77 aHeaderInfo.iTransactionLabel = SymbianAvctp::TransactionLabel(dataP); |
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78 } |
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79 |
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80 // No checking needs to be done on the TAvctpHeaderInfo variables since |
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81 // all values are allowed. |
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82 |
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83 // get the packet type |
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84 if (err == KErrNone) |
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85 { |
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86 aHeaderInfo.iPktType = SymbianAvctp::PacketType(dataP); |
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87 switch (aHeaderInfo.iPktType) |
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88 { |
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89 case ENormalPkt: |
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90 if (dataP.Length() < ENormalHeaderLength) |
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91 { |
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92 err = KErrPacketTooShort; |
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93 } |
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94 else |
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95 { |
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96 err = ParseNormalHeader(dataP, aHeaderInfo); |
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97 } |
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98 break; |
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99 case EStartFrag: |
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100 if (dataP.Length() < EStartFragHeaderLength) |
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101 { |
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102 err = KErrPacketTooShort; |
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103 } |
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104 else |
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105 { |
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106 err = ParseStartHeader(dataP, aHeaderInfo); |
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107 } |
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108 break; |
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109 case EContinueFrag: |
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110 case EEndFrag: |
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111 // the Size check before this switch statement ensures that |
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112 // the given data is long enough since EOtherFragHeaderLength = 1 |
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113 break; |
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114 default: |
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115 err = KErrUnknownPacketType; |
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116 break; |
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117 } |
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118 } |
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119 return err; |
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120 } |
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121 |
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122 /** |
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123 Fills in the TAvctpNormalHeaderInfo |
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124 Assumes aData is at least ENormalHeaderLength long |
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125 |
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126 @internalComponent |
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127 @param aData The data buffer that contains the AVCTP packet to be parsed |
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128 @param aHeaderInfo will contain the result of the parsing. |
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129 @return KErrNone if there was no problem parsing the header, otherwise returns an |
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130 Avctp specific error. |
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131 */ |
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132 /*static*/ TInt CAvctpPacket::ParseNormalHeader(const TDesC8& aData, TAvctpNormalHeaderInfo& aHeaderInfo) |
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133 { |
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134 LOG_STATIC_FUNC |
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135 |
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136 aHeaderInfo.iHasValidPid = IsValidPid(aData); |
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137 aHeaderInfo.iPid = Pid(aData); |
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138 return CheckNormalHeaderInfo(aHeaderInfo); |
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139 } |
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140 |
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141 /** |
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142 Fills in the TAvctpStartHeaderInfo |
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143 Assumes aData is at least EStartFragHeaderLength long |
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144 |
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145 @internalComponent |
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146 @param aData The data buffer that contains the AVCTP packet to be parsed |
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147 @param aHeaderInfo will contain the result of the parsing. |
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148 @return KErrNone if there was no problem parsing the header, otherwise returns an |
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149 Avctp specific error. |
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150 */ |
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151 /*static*/ TInt CAvctpPacket::ParseStartHeader(const TDesC8& aData, TAvctpStartHeaderInfo& aHeaderInfo) |
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152 { |
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153 LOG_STATIC_FUNC |
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154 |
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155 TInt err = ParseNormalHeader(aData, aHeaderInfo); |
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156 if (err == KErrNone) |
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157 { |
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158 aHeaderInfo.iFragmentsInSdu = FragmentsInSdu(aData); |
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159 err = CheckStartHeaderInfo(aHeaderInfo); |
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160 } |
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161 |
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162 return err; |
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163 } |
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164 |
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165 /* |
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166 Checks the validity of a TAvctpNormalHeaderInfo object. Note that the variables |
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167 derived from TAvctpHeaderInfo cannot be incorrect since all values that might appear |
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168 in a air packet are allowed. |
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169 |
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170 (NB the RFA field in Continue and End packets [the IPID field in other types of packet] |
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171 must be set to 0 in the AVCTP v1.0 spec. However, we don't enforce this on incoming |
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172 in case it is used in future.) |
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173 */ |
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174 /*static*/ TInt CAvctpPacket::CheckNormalHeaderInfo(const TAvctpNormalHeaderInfo& aHeaderInfo) |
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175 { |
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176 LOG_STATIC_FUNC |
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177 |
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178 ASSERT_DEBUG(aHeaderInfo.iPktType == ENormalPkt || |
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179 aHeaderInfo.iPktType == EStartFrag); |
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180 |
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181 TInt ret = KErrNone; |
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182 if (!aHeaderInfo.iHasValidPid && aHeaderInfo.iMsgType == ECommand) |
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183 { |
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184 ret = KErrMalformedPacketFromRemote; |
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185 } |
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186 return ret; |
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187 } |
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188 |
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189 /* |
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190 Checks the validity of a TAvctpStartHeaderInfo object. |
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191 */ |
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192 /*static*/ TInt CAvctpPacket::CheckStartHeaderInfo(const TAvctpStartHeaderInfo& aHeaderInfo) |
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193 { |
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194 LOG_STATIC_FUNC |
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195 |
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196 ASSERT_DEBUG(aHeaderInfo.iPktType == EStartFrag); |
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197 |
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198 TInt ret = KErrNone; |
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199 if (aHeaderInfo.iFragmentsInSdu > 1) |
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200 { |
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201 ret = CheckNormalHeaderInfo(aHeaderInfo); |
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202 } |
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203 else |
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204 { |
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205 ret = KErrMalformedPacketFromRemote; |
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206 } |
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207 |
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208 return ret; |
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209 } |
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210 |
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211 |
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212 // |
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213 // // |
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214 // HAvctpOutgoingSdu Implementation // |
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215 // // |
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216 // |
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217 |
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218 HAvctpOutgoingSdu* HAvctpOutgoingSdu::NewL(const TAvctpNormalHeaderInfo& aHeaderInfo, |
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219 const TBTDevAddr& aAddr, |
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220 RMBufChain& aData) |
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221 { |
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222 LOG_STATIC_FUNC |
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223 |
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224 HAvctpOutgoingSdu* sdu = new(ELeave) HAvctpOutgoingSdu(aHeaderInfo, aAddr); |
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225 CleanupStack::PushL(sdu); |
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226 sdu->ConstructL(aData); |
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227 CleanupStack::Pop(sdu); |
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228 return sdu; |
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229 } |
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230 |
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231 /** |
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232 Create the buffer by copying over the other descriptor allowing space for a header |
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233 at the beginning |
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234 */ |
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235 void HAvctpOutgoingSdu::ConstructL(RMBufChain& aData) |
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236 { |
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237 LOG_FUNC |
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238 iSduData.Assign(aData); |
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239 } |
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240 |
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241 HAvctpOutgoingSdu* HAvctpOutgoingSdu::NewIpidResponseL(const HAvctpIncomingSdu& aIncomingSdu, TInt aChannel) |
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242 { |
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243 LOG_STATIC_FUNC |
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244 |
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245 TPtrC8 hdr(CAvctpPacket::GetHeader(aIncomingSdu.Data())); |
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246 |
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247 LOG1(_L("to Pid 0x%x"), Pid(hdr)); |
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248 |
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249 TAvctpNormalHeaderInfo headerInfo = |
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250 TAvctpNormalHeaderInfo(TransactionLabel(hdr), |
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251 ENormalPkt, |
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252 EResponse, |
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253 EFalse, |
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254 Pid(hdr) |
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255 ); |
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256 |
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257 HAvctpOutgoingSdu* sdu = new(ELeave) HAvctpOutgoingSdu(headerInfo, aIncomingSdu.BTAddr()); |
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258 sdu->iChannel = aChannel; |
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259 |
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260 return sdu; |
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261 } |
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262 |
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263 HAvctpOutgoingSdu::~HAvctpOutgoingSdu() |
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264 { |
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265 LOG_FUNC |
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266 |
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267 iSduData.Free(); |
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268 |
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269 if (iOutboundQ) |
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270 { |
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271 iOutboundQ->Deque(*this); |
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272 } |
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273 else |
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274 { |
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275 iQueLink.Deque(); |
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276 } |
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277 } |
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278 |
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279 |