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1 // Copyright (c) 1997-2009 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 // MBuf Stream Queue |
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15 // |
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16 // |
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17 |
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18 #include <nifmbuf.h> |
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19 |
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20 // |
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21 // MBuf Stream Queues |
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22 // |
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23 |
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24 EXPORT_C RMBufStreamQ::RMBufStreamQ() |
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25 /** |
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26 Constructor |
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27 */ |
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28 { |
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29 iPosition = -1; iMBuf = NULL; |
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30 } |
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31 |
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32 |
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33 EXPORT_C void RMBufStreamQ::CopyOut(TDes8& aDes) |
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34 /** |
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35 Copies a data from the chain to a TDes8 buffer |
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36 @param aDes the buffer where the data is copied to |
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37 */ |
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38 { |
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39 AsRMBufChain().CopyOut(aDes); |
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40 } |
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41 |
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42 EXPORT_C void RMBufStreamQ::TrimStart(TInt aOffset) |
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43 /** |
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44 Trims the data upto offset |
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45 @param aOffset the offset |
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46 */ |
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47 { |
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48 AsRMBufChain().TrimStart(aOffset); |
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49 if (iNext==NULL) |
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50 { |
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51 iLast = NULL; |
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52 iPosition = -1; |
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53 } |
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54 else |
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55 { |
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56 iPosition -= aOffset; |
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57 } |
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58 } |
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59 |
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60 EXPORT_C void RMBufStreamQ::Append(RMBufChain& aPacket) |
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61 /** |
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62 Appends a MBuf chain to this stream |
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63 @param aPacket the MBuf chain |
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64 */ |
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65 { |
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66 if (iPosition>=0 && iMBuf==NULL) |
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67 { |
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68 RMBuf* m = iLast; |
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69 RMBufQ::Append(aPacket); |
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70 if (m!=NULL && (m = m->Next(), m!=NULL)) |
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71 { |
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72 iMBuf = m; |
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73 iOffset = m->Offset(); |
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74 iLength = m->Length(); |
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75 } |
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76 } |
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77 else |
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78 RMBufQ::Append(aPacket); |
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79 } |
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80 |
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81 EXPORT_C void RMBufStreamQ::CopySegmentL(RMBufChain& aNewChain, TInt aOffset, TInt aLen/*, const TDesC8* aDes*/) |
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82 /** |
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83 Copies a segment to a MBuf chain |
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84 Functionaly the similar to RMBufChain::CopyL, except that cache pointer |
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85 information is updated to optimise the common case of each extraction |
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86 following on from the previous call. |
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87 @param aNewChain the chain to be created |
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88 @param aOffset the offset |
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89 @param aLen the length |
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90 */ |
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91 { |
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92 TInt n, n1, n2; |
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93 TUint8* p1, *p2; |
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94 RMBuf* m1, *m2; |
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95 |
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96 // Locate offset into stream queue |
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97 if (aOffset>0) |
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98 { |
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99 if (aOffset!=iPosition || iMBuf==NULL) |
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100 { |
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101 TInt o = aOffset; |
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102 RMBuf* m = iNext; |
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103 while (m!=NULL && o>=m->Length()) |
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104 { |
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105 o -= m->Length(); |
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106 m = m->Next(); |
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107 } |
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108 |
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109 if (!m) |
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110 { |
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111 User::Leave(KErrOverflow); |
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112 } |
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113 iPosition = aOffset; |
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114 iMBuf = m; |
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115 iOffset = o + m->Offset(); |
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116 iLength = m->Length() - o; |
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117 } |
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118 |
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119 m1 = iMBuf; |
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120 n = iOffset; |
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121 n1 = iLength; |
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122 p1 = m1->Buffer()+n; |
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123 } |
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124 else |
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125 { |
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126 m1 = iNext; |
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127 p1 = m1->Ptr(); |
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128 n1 = m1->Length(); |
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129 } |
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130 |
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131 TInt len = aLen; |
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132 aNewChain.AllocL(len); |
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133 m2 = aNewChain.First(); |
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134 |
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135 p2 = m2->Ptr(); |
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136 n2 = m2->Length(); |
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137 |
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138 while (len>0) |
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139 { |
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140 n = n1 < n2 ? n1 : n2; |
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141 Mem::Copy(p2, p1, n); |
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142 if (n1 -= n, n1 == 0) |
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143 { |
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144 if (m1 = m1->Next(), m1==NULL) |
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145 break; |
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146 p1 = m1->Ptr(); |
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147 n1 = m1->Length(); |
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148 } |
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149 else |
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150 p1 += n; |
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151 |
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152 if (n2 -= n, n2 == 0) |
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153 { |
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154 if (m2 = m2->Next(), m2==NULL) |
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155 break; |
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156 p2 = m2->Ptr(); |
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157 n2 = m2->Length(); |
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158 } |
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159 else |
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160 p2 += n; |
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161 |
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162 len -= n; |
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163 } |
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164 |
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165 if (m1) |
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166 { |
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167 iPosition = aOffset+aLen; |
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168 iMBuf = m1; |
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169 iOffset = p1-m1->Buffer(); |
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170 iLength = n1; |
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171 } |
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172 else |
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173 { |
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174 iPosition = aOffset+aLen; |
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175 iMBuf = NULL; |
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176 } |
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177 } |