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1 // Copyright (c) 2002-2009 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 : CDeflateComp.cpp |
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15 // Part of : deflatecomp |
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16 // deflate ECOM plugin, CSigCompCompressor implementation |
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17 // Version : 1.4 |
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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 <e32base.h> |
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23 #include <badesca.h> |
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24 #include <hash.h> |
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25 |
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26 #include "Sigcomp.h" |
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27 #include "sigcompcompartment.h" |
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28 #include "SigCompStateMgr.h" |
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29 |
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30 #include "DeflateComp.h" |
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31 #include "Deflate.h" |
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32 #include "SigCompDeflateContext.h" |
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33 #include "StateMgr.h" |
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34 #include "Udvm.h" |
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35 #include "sigcompstateitem.h" |
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36 #include "MessageWriter.h" |
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37 |
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38 |
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39 /** SIP dictionary hash */ |
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40 static const TUint8 KSIPDictionaryHash[] = |
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41 { |
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42 0xfb, 0xe5, 0x07, 0xdf, 0xe5, 0xe6, 0xaa, 0x5a, 0xf2, 0xab, |
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43 0xb9, 0x14, 0xce, 0xaa, 0x05, 0xf9, 0x9c, 0xe6, 0x1b, 0xa5 |
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44 }; |
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45 |
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46 /** size of the first part of SIP dictionary, |
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47 phrases only. RFC 3485.*/ |
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48 const TInt KSIPDictionaryPhrasesSize = 0x0d8c; |
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49 |
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50 |
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51 /** mask to get cpb value from returned parameters */ |
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52 //static const TInt KReturnedParametersCPBMask = 3; |
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53 |
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54 /** number of bits returned parameters has to be shifted right |
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55 to get cpb value */ |
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56 static const TInt KReturnedParametersCPBShift = 6; |
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57 |
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58 /** mask to get dms value from returned parameters */ |
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59 static const TInt KReturnedParametersDMSMask = 7; |
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60 |
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61 /** number of bits returned parameters has to be shifted right |
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62 to get dms value */ |
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63 static const TInt KReturnedParametersDMSShift = 3; |
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64 |
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65 /** mask to get sms value from returned parameters */ |
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66 static const TInt KReturnedParametersSMSMask = 7; |
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67 |
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68 /** number of bits returned parameters has to be shifted right |
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69 to get sms value */ |
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70 static const TInt KReturnedParametersSMSShift = 0; |
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71 |
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72 |
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73 /** RFC3220 chapter 7. each sigcomp message starts with 5 bits set to 1 */ |
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74 static const TInt KMessageCommonHeader = (0x1f << 3); |
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75 |
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76 /** T bit in message header */ |
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77 static const TInt KMessageHeaderTBit (1 << 2); |
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78 |
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79 /** length to be set in message header. 0x1 == 6 bytes of hash id length */ |
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80 static const TInt KMessageHeaderLen = 0x01; |
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81 |
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82 /** 'requested feedback is present' flag */ |
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83 static const TInt KRequestedFeedbackPresentFlag = 4; |
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84 |
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85 /** number of bits size of bytecode must be shifted left to get it |
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86 on correct position in header*/ |
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87 static const TInt KBytecodeLengthShift = 4; |
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88 |
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89 /** number of bits bytecode destination must be shifted right to get |
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90 correct bit representation of destination. note, the bit |
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91 representation is actually (dest >> shift) - 1 */ |
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92 static const TInt KBytecodeDestinationShift = 6; |
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93 |
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94 /** number of bits cycles must be shifted left to het it on correct position |
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95 in returned parameters field */ |
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96 //static const TInt KParametersCyclesShift = 6; |
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97 |
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98 /** number of bits memory size must be shifted left to get in on correct |
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99 position in returned parameters field */ |
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100 //static const TInt KParametersMemorySizeShift = 3; |
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101 |
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102 _LIT8(KZero, "\0"); |
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103 _LIT8(KEightZeros, "\0\0\0\0\0\0\0\0"); |
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104 |
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105 /** minimum circular buffer size */ |
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106 static const TInt KMinCBSize = (258/2+1); |
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107 |
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108 |
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109 // ---------------------------------------------------------------------------- |
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110 |
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111 CDeflateComp* CDeflateComp::NewL(TAny* aInitParams) |
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112 { |
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113 return new (ELeave)CDeflateComp(aInitParams); |
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114 } |
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115 |
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116 |
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117 // ---------------------------------------------------------------------------- |
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118 |
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119 CDeflateComp::CDeflateComp(TAny* aInitParams) |
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120 { |
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121 TCompressorInitParams* initParams = static_cast<TCompressorInitParams*> |
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122 (aInitParams); |
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123 iStateMgr = initParams->iStateMgr; |
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124 iStateItem = initParams->iStateItem; |
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125 iStateItemLength = initParams->iStateItemLength; |
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126 iUploadState = initParams->iUploadState; |
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127 |
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128 // SIP dictionary |
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129 if (iStateItem) |
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130 { |
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131 if (!Mem::Compare(iStateItem->iStateIdentifier, |
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132 sizeof(KSIPDictionaryHash), |
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133 KSIPDictionaryHash, sizeof(KSIPDictionaryHash))) |
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134 { |
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135 if (iStateItemLength > KSIPDictionaryPhrasesSize) |
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136 iStateItemLength = KSIPDictionaryPhrasesSize; |
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137 } |
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138 |
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139 } |
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140 } |
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141 |
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142 // ---------------------------------------------------------------------------- |
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143 |
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144 CDeflateComp::~CDeflateComp() |
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145 { |
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146 } |
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147 |
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148 |
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149 |
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150 // ---------------------------------------------------------------------------- |
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151 |
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152 TUint CDeflateComp::SetDictionary(const TStateItem* aDictionaryState, |
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153 CDeflate* aDeflateComp, |
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154 CSigCompDeflateContext* aDeflateContext) const |
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155 { |
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156 if (aDictionaryState) |
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157 { |
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158 TInt dictLength; |
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159 const TUint8* ptr = aDictionaryState->iStateValue; |
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160 |
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161 dictLength = (iStateItemLength > aDeflateContext->WindowSize()) ? |
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162 aDeflateContext->WindowSize() : iStateItemLength; |
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163 |
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164 ptr += (iStateItemLength - dictLength); |
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165 |
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166 aDeflateComp->SetDictionary(ptr, dictLength); |
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167 return 1; |
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168 } |
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169 |
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170 return 0; |
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171 } |
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172 |
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173 |
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174 // ---------------------------------------------------------------------------- |
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175 |
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176 void CDeflateComp::AppendDataL(CMessageWriter* aWriter, TUint8 aValue) |
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177 { |
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178 aWriter->WriteByteL(aValue); |
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179 } |
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180 |
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181 |
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182 // ---------------------------------------------------------------------------- |
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183 |
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184 void CDeflateComp::AppendDataL(CMessageWriter* aWriter, TUint16 aValue) |
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185 { |
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186 TUint8 tmp = static_cast<TUint8>((aValue >> 8) & KMax8BitValueMask); |
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187 aWriter->WriteByteL(tmp); |
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188 tmp = static_cast<TUint8>(aValue & KMax8BitValueMask); |
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189 aWriter->WriteByteL(tmp); |
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190 } |
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191 |
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192 |
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193 // ---------------------------------------------------------------------------- |
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194 |
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195 void CDeflateComp::AppendDataL(CMessageWriter* aWriter, const TDesC8& aData) |
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196 { |
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197 aWriter->WriteBlockL(aData); |
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198 } |
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199 |
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200 |
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201 // ---------------------------------------------------------------------------- |
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202 |
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203 void CDeflateComp::AppendRequestedFeedbackL(CMessageWriter *aWriter, |
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204 const TDesC8& aRequestedFeedback) |
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205 { |
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206 if (aRequestedFeedback.Length()) |
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207 { |
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208 const TUint8* rfdata = aRequestedFeedback.Ptr(); |
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209 if (rfdata[0] & KRequestedFeedbackPresentFlag) |
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210 { |
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211 AppendDataL(aWriter, |
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212 TPtrC8(&rfdata[1], |
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213 aRequestedFeedback.Length() - 1)); |
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214 } |
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215 } |
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216 } |
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217 |
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218 |
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219 // ---------------------------------------------------------------------------- |
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220 |
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221 void CDeflateComp::CalculateBytecodeHashL( |
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222 CSigCompDeflateContext* aDeflateContext, |
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223 TDeflateCompBytecodeId aBytecode, |
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224 TUint8 aReturnedParameters) |
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225 { |
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226 |
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227 CSHA1* sha1 = CSHA1::NewL(); |
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228 CleanupStack::PushL(sha1); |
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229 sha1->Reset(); |
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230 |
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231 // set state header |
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232 TUint start = KDeflateBytecodes[aBytecode].iStateStart; |
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233 TUint instr = KDeflateBytecodes[aBytecode].iBytecodeStart; |
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234 TUint size = KDeflateBytecodes[aBytecode].iStateSize; |
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235 |
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236 TUint8 stateData[8+11]; |
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237 stateData[0] = static_cast<TUint8>((size >> 8) & 0xff); |
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238 stateData[1] = static_cast<TUint8>(size & 0xff); |
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239 stateData[2] = static_cast<TUint8>((start >> 8) & 0xff); |
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240 stateData[3] = static_cast<TUint8>(start & 0xff); |
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241 stateData[4] = static_cast<TUint8>((instr >> 8) & 0xff); |
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242 stateData[5] = static_cast<TUint8>(instr & 0xff); |
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243 stateData[6] = 0; |
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244 stateData[7] = 6; |
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245 |
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246 // set bytecode values area |
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247 |
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248 switch (aBytecode) |
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249 { |
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250 case EStaticBytecode: |
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251 { |
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252 /* |
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253 :state_area_start |
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254 :dictionary_id pad (6) |
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255 :dictionary_phrases_size pad (2) |
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256 :returned_parameters_location pad (1) |
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257 :returned_sigcomp_version pad (1) |
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258 :returned_parameters_zero pad (1) |
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259 */ |
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260 if (iStateItem) |
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261 { |
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262 Mem::Copy(&stateData[8], |
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263 iStateItem->iStateIdentifier, |
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264 KMinPartialStateLength); |
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265 stateData[8+6] = static_cast<TUint8>( |
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266 (iStateItemLength >> 8) & 0xff); |
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267 stateData[8+7] = static_cast<TUint8>( |
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268 iStateItemLength & 0xff); |
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269 } |
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270 else |
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271 { |
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272 Mem::FillZ(&stateData[8], KMinPartialStateLength + 2); |
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273 } |
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274 stateData[8+8] = static_cast<TUint8>(aReturnedParameters); |
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275 stateData[8+9] = static_cast<TUint8>(KSigCompVersion); |
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276 stateData[8+10] = static_cast<TUint8>(0); |
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277 |
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278 sha1->Hash(TPtrC8(stateData, 8+11)); |
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279 break; |
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280 } |
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281 |
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282 case EStaticUploadBytecode: |
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283 { |
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284 // hash from feedback |
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285 break; |
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286 } |
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287 |
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288 case EDynamicBytecode: |
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289 { |
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290 /* |
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291 :state_area_start |
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292 :returned_parameters_location pad (1) |
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293 :returned_sigcomp_version pad (1) |
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294 :returned_parameters_zero pad (1) |
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295 */ |
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296 stateData[8+0] = static_cast<TUint8>(aReturnedParameters); |
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297 stateData[8+1] = static_cast<TUint8>(KSigCompVersion); |
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298 stateData[8+2] = static_cast<TUint8>(0); |
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299 |
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300 sha1->Hash(TPtrC8(stateData, 8+3)); |
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301 break; |
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302 } |
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303 |
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304 case EDynamicUploadBytecode: |
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305 { |
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306 // hash from feedback |
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307 break; |
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308 } |
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309 } |
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310 |
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311 TPtrC8 hash = sha1->Hash(TPtrC8(KDeflateBytecodes[aBytecode].iBytecode, |
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312 KDeflateBytecodes[aBytecode].iBytecodeSize)); |
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313 |
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314 TInt toZero = KDeflateBytecodes[aBytecode].iStateSize - |
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315 KDeflateBytecodes[aBytecode].iBytecodeInit + |
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316 KDeflateBytecodes[aBytecode].iStateStart - |
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317 KDeflateBytecodes[aBytecode].iBytecodeSize; |
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318 TInt i; |
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319 for(i=0; i<toZero; i++) |
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320 { |
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321 // Not covered because current bytecodes not need that |
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322 // I left the code there, as it may be usefull for other bytecodes. |
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323 hash.Set(sha1->Hash(KZero)); |
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324 } |
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325 |
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326 aDeflateContext->SetBytecodeHash(hash.Ptr()); |
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327 |
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328 CleanupStack::PopAndDestroy(sha1); |
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329 } |
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330 |
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331 |
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332 // ---------------------------------------------------------------------------- |
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333 |
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334 TInt CDeflateComp::EncodeCyclesPerBit( |
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335 CSigComp::TCyclesPerBit aCyclesPerBit) const |
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336 { |
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337 TInt result = 0; |
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338 TUint value = aCyclesPerBit >> 5; |
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339 |
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340 while (value) |
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341 { |
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342 result++; |
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343 value >>= 1; |
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344 } |
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345 |
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346 return result; |
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347 } |
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348 |
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349 |
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350 // ---------------------------------------------------------------------------- |
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351 |
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352 TInt CDeflateComp::EncodeMemorySize(CSigComp::TMemorySize aMemorySize) const |
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353 { |
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354 TInt result = 0; |
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355 TUint value = aMemorySize >> 11; |
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356 |
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357 while (value) |
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358 { |
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359 result++; |
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360 value >>= 1; |
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361 } |
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362 |
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363 return result; |
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364 } |
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365 |
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366 |
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367 // ---------------------------------------------------------------------------- |
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368 |
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369 CSigComp::TMemorySize CDeflateComp::DecodeMemorySize(TInt aMemorySize) |
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370 { |
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371 |
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372 TInt result = aMemorySize ? 1 << (10+aMemorySize) : 0; |
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373 |
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374 return static_cast<CSigComp::TMemorySize>(result); |
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375 } |
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376 |
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377 |
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378 // ---------------------------------------------------------------------------- |
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379 |
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380 TUint8 CDeflateComp::EncodeReturnedParameters( |
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381 MSigCompCompartmentContext* aCompartmentContext) |
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382 { |
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383 return static_cast<TUint8>( |
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384 (EncodeCyclesPerBit(aCompartmentContext->CyclesPerBit()) << |
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385 KReturnedParametersCPBShift) | |
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386 (EncodeMemorySize(aCompartmentContext->DecompressionMemorySize()) << |
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387 KReturnedParametersDMSShift) | |
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388 (EncodeMemorySize(aCompartmentContext->StateMemorySize()) << |
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389 KReturnedParametersSMSShift)); |
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390 } |
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391 |
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392 |
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393 // ---------------------------------------------------------------------------- |
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394 |
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395 void CDeflateComp::ParseReturnedParameters(const TDesC8& aReturnedParameters, |
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396 CSigCompDeflateContext* aDeflateContext) |
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397 { |
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398 |
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399 if (aReturnedParameters.Length()) |
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400 { |
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401 const TUint8* retpdata = aReturnedParameters.Ptr(); |
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402 TUint8 rp = *retpdata; |
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403 |
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404 aDeflateContext->SetDms( |
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405 DecodeMemorySize((rp >> KReturnedParametersDMSShift) & |
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406 KReturnedParametersDMSMask)); |
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407 aDeflateContext->SetSms( |
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408 DecodeMemorySize((rp >> KReturnedParametersSMSShift) & |
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409 KReturnedParametersSMSMask)); |
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410 } |
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411 } |
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412 |
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413 |
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414 // ---------------------------------------------------------------------------- |
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415 |
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416 void CDeflateComp::AppendDataHeaderL(CMessageWriter* aWriter, |
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417 TDeflateCompBytecodeId aBytecode, |
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418 TUint8 aReturnedParameters, |
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419 TInt aUdvmSize, |
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420 TBool aFirstMessage, |
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421 CSigCompDeflateContext* aDeflateContext) |
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422 { |
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423 |
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424 switch (aBytecode) |
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425 { |
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426 case EStaticBytecode: |
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427 { |
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428 /* |
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429 dictionary_id: 6 bytes (1st message only) |
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430 dictionary_phrases_size: 2 bytes (1st message only) |
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431 returned_parameters_location: 1 byte (1st message only) |
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432 returned_sigcomp_version: 1 byte (1st message only) |
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433 udvm_memory_size: 2 bytes |
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434 */ |
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435 if (aFirstMessage) |
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436 { |
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437 if (iStateItem) |
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438 { |
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439 AppendDataL(aWriter, |
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440 TPtrC8(iStateItem->iStateIdentifier, |
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441 KMinPartialStateLength)); |
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442 AppendDataL(aWriter, |
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443 static_cast<TUint16>(iStateItemLength)); |
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444 } |
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445 else |
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446 { |
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447 AppendDataL(aWriter, KEightZeros); |
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448 } |
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449 |
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450 AppendDataL(aWriter, aReturnedParameters); |
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451 AppendDataL(aWriter, static_cast<TUint8>(KSigCompVersion)); |
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452 } |
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453 |
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454 AppendDataL(aWriter, static_cast<TUint16>(aUdvmSize)); |
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455 |
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456 break; |
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457 } |
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458 |
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459 case EStaticUploadBytecode: |
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460 { |
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461 /* |
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462 udvm_memory_size: 2 bytes |
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463 state_length 2 bytes (1st message only) |
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464 state value state_length bytes (1st message only) |
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465 returned_parameters_location: 1 byte (1st message only) |
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466 returned_sigcomp_version: 1 byte (1st message only) |
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467 */ |
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468 AppendDataL(aWriter, static_cast<TUint16>(aUdvmSize)); |
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469 |
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470 if (aFirstMessage) |
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471 { |
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472 AppendDataL(aWriter, static_cast<TUint16>(iStateItemLength)); |
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473 AppendDataL(aWriter, TPtrC8(iStateItem->iStateValue, |
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474 iStateItemLength)); |
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475 AppendDataL(aWriter, aReturnedParameters); |
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476 AppendDataL(aWriter, static_cast<TUint8>(KSigCompVersion)); |
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477 } |
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478 |
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479 break; |
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480 } |
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481 |
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482 case EDynamicBytecode: |
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483 { |
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484 /* |
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485 returned_parameters_location: 1 byte (1st message only) |
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486 returned_sigcomp_version: 1 byte (1st message only) |
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487 udvm_memory_size: 2 bytes |
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488 dictionary_phrases_size: 2 bytes |
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489 dictionary_id: 6 bytes (if dictionary_phrases_size!=0) |
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490 cbstate_size: 2 bytes |
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491 cbstate_id: 6 bytes (if cbstate_size!=0) |
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492 */ |
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493 if (aFirstMessage) |
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494 { |
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495 AppendDataL(aWriter, aReturnedParameters); |
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496 AppendDataL(aWriter, static_cast<TUint8>(KSigCompVersion)); |
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497 } |
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498 |
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499 AppendDataL(aWriter, static_cast<TUint16>(aUdvmSize)); |
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500 |
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501 if (aDeflateContext->CBStateConfirmed()) |
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502 { |
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503 AppendDataL(aWriter, static_cast<TUint16>(0)); |
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504 AppendDataL(aWriter, static_cast<TUint16>( |
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505 aDeflateContext->CBStateLength())); |
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506 AppendDataL(aWriter, TPtrC8(aDeflateContext->CBStateHash(), |
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507 KMinPartialStateLength)); |
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508 } |
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509 else |
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510 { |
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511 if (iStateItem) |
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512 { |
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513 AppendDataL(aWriter, static_cast<TUint16>( |
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514 iStateItemLength)); |
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515 AppendDataL(aWriter, TPtrC8(iStateItem->iStateIdentifier, |
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516 KMinPartialStateLength)); |
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517 AppendDataL(aWriter, static_cast<TUint16>(0)); |
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518 } |
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519 else |
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520 { |
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521 AppendDataL(aWriter, static_cast<TUint16>(0)); |
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522 AppendDataL(aWriter, static_cast<TUint16>(0)); |
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523 } |
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524 } |
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525 break; |
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526 } |
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527 |
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528 case EDynamicUploadBytecode: |
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529 { |
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530 /* |
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531 udvm_memory_size: 2 bytes |
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532 state_length 2 bytes (1st message only) |
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533 state value state_length bytes (1st message only) |
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534 returned_parameters_location: 1 byte (1st message only) |
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535 returned_sigcomp_version: 1 byte (1st message only) |
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536 cbstate_size: 2 bytes (nth message only) |
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537 cbstate_id: 6 bytes (if cbstate_size!=0) |
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538 */ |
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539 AppendDataL(aWriter, static_cast<TUint16>(aUdvmSize)); |
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540 |
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541 if (aFirstMessage) |
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542 { |
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543 AppendDataL(aWriter, static_cast<TUint16>(iStateItemLength)); |
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544 AppendDataL(aWriter, TPtrC8(iStateItem->iStateValue, |
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545 iStateItemLength)); |
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546 AppendDataL(aWriter, aReturnedParameters); |
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547 AppendDataL(aWriter, static_cast<TUint8>(KSigCompVersion)); |
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548 } |
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549 else |
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550 { |
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551 if (aDeflateContext->CBStateConfirmed()) |
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552 { |
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553 AppendDataL(aWriter, static_cast<TUint16>( |
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554 aDeflateContext->CBStateLength())); |
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555 AppendDataL(aWriter, TPtrC8(aDeflateContext->CBStateHash(), |
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556 KMinPartialStateLength)); |
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557 } |
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558 else |
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559 { |
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560 AppendDataL(aWriter, static_cast<TUint16>(0)); |
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561 } |
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562 } |
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563 |
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564 break; |
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565 } |
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566 } |
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567 } |
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568 |
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569 |
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570 // ---------------------------------------------------------------------------- |
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571 |
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572 TInt CDeflateComp::CalcCBSizeL(TInt& aUdvmSize, |
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573 TDeflateCompBytecodeId aBytecode, |
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574 CSigCompDeflateContext* aDeflateContext) |
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575 { |
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576 |
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577 TInt cbSize = aUdvmSize - KDeflateBytecodes[aBytecode].iCBufStart; |
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578 |
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579 // no memory for bytecode and circular buffer |
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580 if (cbSize < 0) |
|
581 return cbSize; |
|
582 |
|
583 switch (aBytecode) |
|
584 { |
|
585 case EStaticBytecode: |
|
586 { |
|
587 break; |
|
588 } |
|
589 |
|
590 case EStaticUploadBytecode: |
|
591 { |
|
592 break; |
|
593 } |
|
594 |
|
595 case EDynamicBytecode: |
|
596 { |
|
597 TInt availSms = aDeflateContext->Sms() - |
|
598 KDeflateBytecodes[aBytecode].iStateSize - |
|
599 KStateCostExtension; |
|
600 |
|
601 if (availSms <= 0) |
|
602 { |
|
603 return cbSize; |
|
604 } |
|
605 |
|
606 if ((cbSize+2+KStateCostExtension) > availSms) |
|
607 { |
|
608 cbSize = availSms - 2 - KStateCostExtension; |
|
609 aUdvmSize = cbSize + KDeflateBytecodes[aBytecode].iCBufStart; |
|
610 } |
|
611 |
|
612 break; |
|
613 } |
|
614 |
|
615 case EDynamicUploadBytecode: |
|
616 { |
|
617 TInt availSms = aDeflateContext->Sms() - |
|
618 KDeflateBytecodes[aBytecode].iStateSize - |
|
619 KStateCostExtension - |
|
620 iStateItemLength - |
|
621 KStateCostExtension; |
|
622 |
|
623 if (availSms <= 0) |
|
624 { |
|
625 return cbSize; |
|
626 } |
|
627 |
|
628 if ((cbSize+2+KStateCostExtension) > availSms) |
|
629 { |
|
630 cbSize = availSms - 2 - KStateCostExtension; |
|
631 aUdvmSize = cbSize + KDeflateBytecodes[aBytecode].iCBufStart; |
|
632 } |
|
633 |
|
634 break; |
|
635 } |
|
636 } |
|
637 |
|
638 return cbSize; |
|
639 } |
|
640 |
|
641 // ---------------------------------------------------------------------------- |
|
642 |
|
643 CSigCompDeflateContext* CDeflateComp::DeflateContextL( |
|
644 MSigCompCompartmentContext* aCompartmentContext) |
|
645 { |
|
646 CSigCompCompressionContext* tmpContext = |
|
647 const_cast<CSigCompCompressionContext*> |
|
648 (aCompartmentContext->CompressionContext()); |
|
649 |
|
650 CSigCompDeflateContext* deflateContext = |
|
651 static_cast<CSigCompDeflateContext*> |
|
652 (tmpContext); |
|
653 |
|
654 if (deflateContext == NULL) |
|
655 { |
|
656 deflateContext = new (ELeave)CSigCompDeflateContext(); |
|
657 aCompartmentContext->SetCompressionContext( |
|
658 static_cast<CSigCompCompressionContext*> |
|
659 (deflateContext)); |
|
660 deflateContext->SetUploadState(iUploadState); |
|
661 deflateContext->SetStateItem(iStateItem, iStateItemLength); |
|
662 } |
|
663 else |
|
664 { |
|
665 iUploadState = deflateContext->UploadState(); |
|
666 iStateItem = deflateContext->StateItem(); |
|
667 iStateItemLength = deflateContext->StateItemLength(); |
|
668 } |
|
669 |
|
670 return deflateContext; |
|
671 } |
|
672 |
|
673 |
|
674 // ---------------------------------------------------------------------------- |
|
675 |
|
676 CBufBase* CDeflateComp::CompressMessageL( |
|
677 MSigCompCompartmentContext* aCompartmentContext, |
|
678 const TDesC8& aMessage, |
|
679 TBool aForStreamBasedProtocol) |
|
680 { |
|
681 |
|
682 if (aMessage.Length() == 0) |
|
683 { |
|
684 User::Leave(CSigComp::ECompressionFailure); |
|
685 } |
|
686 |
|
687 TBool dynamic = aCompartmentContext->IsDynamicCompression(); |
|
688 |
|
689 CSigCompDeflateContext* deflateContext = |
|
690 DeflateContextL(aCompartmentContext); |
|
691 |
|
692 ParseReturnedParameters(aCompartmentContext->ReturnedParameters(), |
|
693 deflateContext); |
|
694 |
|
695 // select bytecode |
|
696 TDeflateCompBytecodeId bytecode; |
|
697 |
|
698 if (iUploadState) |
|
699 { |
|
700 if (dynamic) |
|
701 bytecode = EDynamicUploadBytecode; |
|
702 else |
|
703 bytecode = EStaticUploadBytecode; |
|
704 } |
|
705 else |
|
706 { |
|
707 if (dynamic) |
|
708 bytecode = EDynamicBytecode; |
|
709 else |
|
710 bytecode = EStaticBytecode; |
|
711 } |
|
712 |
|
713 CBufFlat* outputBuffer = CBufFlat::NewL(32); |
|
714 CleanupStack::PushL(outputBuffer); |
|
715 outputBuffer->SetReserveL(32); |
|
716 |
|
717 CMessageWriter* messageWriter = new (ELeave)CMessageWriter(outputBuffer, |
|
718 aForStreamBasedProtocol); |
|
719 CleanupStack::PushL(messageWriter); |
|
720 |
|
721 TInt msgPos = 0; |
|
722 while (msgPos < aMessage.Size()) |
|
723 { |
|
724 TInt msgSize = aMessage.Size() - msgPos; |
|
725 |
|
726 if (aForStreamBasedProtocol) |
|
727 { |
|
728 if (msgSize > KMaxOutputSize) |
|
729 { |
|
730 msgSize = KMaxOutputSize; |
|
731 } |
|
732 } |
|
733 else |
|
734 { |
|
735 if (msgSize > KMaxOutputSize) |
|
736 { |
|
737 User::Leave(CSigComp::ECompressionFailure); |
|
738 } |
|
739 } |
|
740 |
|
741 TPtrC8 message(aMessage.Mid(msgPos, msgSize)); |
|
742 |
|
743 const TDesC8& requestedFeedback = |
|
744 aCompartmentContext->RequestedFeedback(); |
|
745 const TDesC8& returnedFeedback = |
|
746 aCompartmentContext->ReturnedFeedback(); |
|
747 |
|
748 CDeflate* deflateComp = CDeflate::NewL(dynamic, deflateContext); |
|
749 CleanupStack::PushL(deflateComp); |
|
750 |
|
751 TUint8 returnedParameters = |
|
752 EncodeReturnedParameters(aCompartmentContext); |
|
753 |
|
754 if (!deflateContext->BytecodeStateConfirmed()) |
|
755 { |
|
756 if (returnedFeedback.Length()) |
|
757 { |
|
758 if(deflateContext->UploadState()) |
|
759 { |
|
760 deflateContext->SetBytecodeHash(returnedFeedback.Ptr() + |
|
761 dynamic*8); |
|
762 deflateContext->SetBytecodeStateConfirmed(ETrue); |
|
763 } |
|
764 else |
|
765 { |
|
766 CalculateBytecodeHashL(deflateContext, bytecode, |
|
767 returnedParameters); |
|
768 deflateContext->SetBytecodeStateConfirmed(ETrue); |
|
769 } |
|
770 } |
|
771 } |
|
772 |
|
773 if (dynamic) |
|
774 { |
|
775 if (returnedFeedback.Length()) |
|
776 { |
|
777 deflateContext->SetCBStateHash(returnedFeedback.Ptr()); |
|
778 TInt cbLen = (returnedFeedback.Ptr()[6]<<8) + |
|
779 returnedFeedback.Ptr()[7]; |
|
780 deflateContext->SetCBStateLength(cbLen); |
|
781 deflateContext->SetCBStateConfirmed(ETrue); |
|
782 } |
|
783 else |
|
784 { |
|
785 deflateContext->SetCBStateConfirmed(EFalse); |
|
786 deflateComp->Reset(); |
|
787 } |
|
788 } |
|
789 |
|
790 TUint8 header = KMessageCommonHeader; |
|
791 |
|
792 if (requestedFeedback.Length()) |
|
793 { |
|
794 header |= KMessageHeaderTBit; |
|
795 } |
|
796 |
|
797 if(!deflateContext->BytecodeStateConfirmed()) |
|
798 { |
|
799 AppendDataL(messageWriter, header); |
|
800 AppendRequestedFeedbackL(messageWriter, requestedFeedback); |
|
801 |
|
802 TUint16 lendest = static_cast<TUint16>( |
|
803 (KDeflateBytecodes[bytecode].iBytecodeSize << |
|
804 KBytecodeLengthShift) | |
|
805 ((KDeflateBytecodes[bytecode].iBytecodeInit >> |
|
806 KBytecodeDestinationShift) - 1)); |
|
807 |
|
808 AppendDataL(messageWriter, lendest); |
|
809 AppendDataL(messageWriter, |
|
810 TPtrC8(KDeflateBytecodes[bytecode].iBytecode, |
|
811 KDeflateBytecodes[bytecode].iBytecodeSize)); |
|
812 } |
|
813 else |
|
814 { |
|
815 header |= KMessageHeaderLen; |
|
816 AppendDataL(messageWriter, header); |
|
817 AppendRequestedFeedbackL(messageWriter, requestedFeedback); |
|
818 |
|
819 AppendDataL(messageWriter, |
|
820 TPtrC8(deflateContext->BytecodeHash(), |
|
821 KMinPartialStateLength)); |
|
822 } |
|
823 |
|
824 // calculate available memory on remote side |
|
825 TInt udvmSize = -1; |
|
826 TInt cbSize = -1; |
|
827 if (deflateContext->BytecodeStateConfirmed()) |
|
828 { |
|
829 udvmSize = deflateContext->UdvmSize(); |
|
830 cbSize = deflateContext->CBSize(); |
|
831 } |
|
832 else |
|
833 { |
|
834 TInt dms = deflateContext->Dms(); |
|
835 for (; (udvmSize < 0) || (cbSize < KMinCBSize); dms<<=1) |
|
836 { |
|
837 if (aForStreamBasedProtocol) |
|
838 { |
|
839 udvmSize = dms / 2; |
|
840 } |
|
841 else |
|
842 { |
|
843 // simulate compressed message size |
|
844 TInt msgSize = outputBuffer->Size() + 2 + |
|
845 message.Length() + 50; |
|
846 if(iUploadState && |
|
847 !deflateContext->BytecodeStateConfirmed()) |
|
848 msgSize += iStateItemLength; |
|
849 |
|
850 udvmSize = dms - msgSize; |
|
851 } |
|
852 |
|
853 if (udvmSize > 0) |
|
854 { |
|
855 if (udvmSize > static_cast<TInt>(KMaxUdvmMemorySize)) |
|
856 { |
|
857 udvmSize = KMaxUdvmMemorySize; |
|
858 } |
|
859 |
|
860 cbSize = CalcCBSizeL(udvmSize, bytecode, deflateContext); |
|
861 } |
|
862 } |
|
863 deflateContext->SetUdvmSize(udvmSize); |
|
864 deflateContext->SetCBSize(cbSize); |
|
865 } |
|
866 |
|
867 AppendDataHeaderL(messageWriter, |
|
868 bytecode, returnedParameters, udvmSize, |
|
869 !deflateContext->BytecodeStateConfirmed(), |
|
870 deflateContext); |
|
871 |
|
872 //configure deflate compressor |
|
873 deflateComp->ChangeWindowSizeL(cbSize); |
|
874 |
|
875 if ((!dynamic) || (!deflateContext->CBStateConfirmed())) |
|
876 { |
|
877 SetDictionary(deflateContext->StateItem(), |
|
878 deflateComp, |
|
879 deflateContext); |
|
880 } |
|
881 |
|
882 //compress actual data |
|
883 deflateComp->CompressL(message, messageWriter); |
|
884 CleanupStack::PopAndDestroy(deflateComp); |
|
885 |
|
886 messageWriter->FlushAndTerminateL(); |
|
887 |
|
888 // clean feedbacks |
|
889 aCompartmentContext->SetRequestedFeedbackL(KNullDesC8); |
|
890 aCompartmentContext->SetReturnedFeedbackL(KNullDesC8); |
|
891 |
|
892 msgPos += msgSize; |
|
893 } |
|
894 outputBuffer->Compress(); |
|
895 CleanupStack::PopAndDestroy(messageWriter); |
|
896 CleanupStack::Pop(outputBuffer); |
|
897 |
|
898 return outputBuffer; |
|
899 } |
|
900 |
|
901 TBool CDeflateComp::IsDynamicCompressionSupported() |
|
902 { |
|
903 return ETrue; |
|
904 } |