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1 // Copyright (c) 2001-2009 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 #include "CHtmlToCrtConvBuffer.h" |
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17 #include "CHtmlToCrtConvAssertDefines.h" |
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18 |
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19 const TInt KReadBufferSize = 256; |
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20 |
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21 CHtmlToCrtConvBuffer::CHtmlToCrtConvBuffer(CCnvCharacterSetConverter& aCnvCharacterSetConverter) |
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22 :iCnvCharacterSetConverter(aCnvCharacterSetConverter) |
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23 { |
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24 } |
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25 |
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26 CHtmlToCrtConvBuffer* CHtmlToCrtConvBuffer::NewL(const TDesC& aFile, RFs& aFsSession, CCnvCharacterSetConverter& aCnvCharacterSetConverter) |
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27 { |
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28 CHtmlToCrtConvBuffer* self=new(ELeave) CHtmlToCrtConvBuffer(aCnvCharacterSetConverter); |
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29 CleanupStack::PushL(self); |
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30 self->ConstructL(aFile, aFsSession); |
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31 CleanupStack::Pop(self); |
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32 return self; |
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33 } |
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34 |
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35 void CHtmlToCrtConvBuffer::ConstructL(const TDesC& aFile, RFs& aFsSession) |
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36 { |
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37 User::LeaveIfError(iFile.Open(aFsSession, aFile, EFileShareReadersOnly)); |
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38 iSourceBuffer=HBufC8::NewL(KReadBufferSize); |
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39 iUnicodeBuffer=HBufC16::NewL(KReadBufferSize); |
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40 } |
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41 |
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42 CHtmlToCrtConvBuffer::~CHtmlToCrtConvBuffer() |
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43 { |
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44 iFile.Close(); |
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45 delete iSourceBuffer; |
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46 delete iUnicodeBuffer; |
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47 } |
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48 |
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49 //=================================================================================================== |
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50 //ReadCharacterL - returns EFalse if no character read, ie when end of file and end of buffer reached |
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51 //=================================================================================================== |
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52 TBool CHtmlToCrtConvBuffer::ReadCharacterL(TChar& aCharacter, TInt& aBufferPosition, TBool& aEndOfBuffer) |
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53 { |
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54 ASSERT((iBufferPosition>=0 && iBufferPosition<=KReadBufferSize)); |
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55 |
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56 aEndOfBuffer=EFalse; |
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57 if (iBufferPosition < iUnicodeBuffer->Length()) |
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58 //character in buffer |
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59 { |
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60 aBufferPosition=iBufferPosition; |
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61 aCharacter=(*iUnicodeBuffer)[iBufferPosition++]; |
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62 if (iBufferPosition==iUnicodeBuffer->Length()) |
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63 { |
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64 aEndOfBuffer=ETrue; |
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65 } |
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66 return ETrue; |
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67 } |
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68 else |
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69 //no characters remaining in buffer |
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70 { |
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71 aBufferPosition=0; |
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72 if (FillBufferL()) |
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73 //file was not empty |
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74 { |
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75 aCharacter=(*iUnicodeBuffer)[iBufferPosition++]; |
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76 if (iBufferPosition==iUnicodeBuffer->Length()) |
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77 { |
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78 aEndOfBuffer=ETrue; |
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79 } |
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80 return ETrue; |
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81 } |
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82 else |
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83 //file was empty |
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84 { |
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85 aEndOfBuffer=ETrue; |
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86 return EFalse; |
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87 } |
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88 } |
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89 } |
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90 |
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91 void CHtmlToCrtConvBuffer::GetPartOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition, TInt aEndPosition) const |
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92 { |
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93 TPtrC16 partOfBuffer(iUnicodeBuffer->Mid(aStartPosition,(aEndPosition - aStartPosition + 1))); |
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94 aPartOfBuffer.Set(partOfBuffer); |
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95 } |
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96 |
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97 void CHtmlToCrtConvBuffer::GetToEndOfBufferL(TPtrC16& aPartOfBuffer, TInt aStartPosition) const |
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98 { |
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99 TPtrC16 partOfBuffer(iUnicodeBuffer->Mid(aStartPosition)); |
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100 aPartOfBuffer.Set(partOfBuffer); |
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101 } |
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102 |
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103 void CHtmlToCrtConvBuffer::GetSampleOfTextFromFileL(TDes8& aSample, TInt aLength, TInt aOffset) |
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104 { |
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105 TInt fileSize=0; |
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106 User::LeaveIfError(iFile.Size(fileSize)); |
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107 |
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108 //adjust aOffset - used to get sample of text from file, so should read aLength chars |
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109 if(fileSize<aLength) |
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110 aOffset=0; |
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111 else if(fileSize<aOffset+aLength) |
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112 aOffset=fileSize-aLength; |
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113 |
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114 User::LeaveIfError(iFile.Read(aOffset, aSample, aLength)); |
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115 ResetL(); |
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116 } |
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117 |
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118 void CHtmlToCrtConvBuffer::ResetL() |
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119 { |
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120 //set read file position to start of file |
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121 TInt pos=0; |
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122 User::LeaveIfError(iFile.Seek(ESeekStart, pos)); |
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123 } |
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124 |
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125 TBool CHtmlToCrtConvBuffer::FillBufferL() |
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126 { |
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127 iBufferPosition = 0; |
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128 //iSourceBuffer contains any remaining unconverted characters from last call to ConvertToUnicode. |
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129 TPtr8 sourcePtr(iSourceBuffer->Des()); |
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130 TInt sourceLength=iSourceBuffer->Length(); |
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131 TBool endOfFileReached=EFalse; |
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132 |
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133 //newBuffer gets characters from the file to fill the remaining space in iSourceBuffer |
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134 HBufC8* newBuffer=HBufC8::NewLC(KReadBufferSize-sourceLength); |
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135 TPtr8 newBufferPtr(newBuffer->Des()); |
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136 User::LeaveIfError(iFile.Read(newBufferPtr, KReadBufferSize-sourceLength)); |
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137 sourcePtr.Append(newBufferPtr); |
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138 CleanupStack::PopAndDestroy(newBuffer); |
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139 |
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140 sourceLength=sourcePtr.Length(); |
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141 if(sourceLength < KReadBufferSize) |
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142 { |
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143 endOfFileReached=ETrue; |
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144 if(sourcePtr.Length()==0) |
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145 { |
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146 return EFalse; |
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147 } |
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148 } |
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149 |
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150 TPtr16 unicodePtr(iUnicodeBuffer->Des()); |
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151 unicodePtr.Zero(); |
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152 |
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153 DoConvertBufferL(sourcePtr, unicodePtr, sourceLength, endOfFileReached); |
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154 |
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155 return ETrue; |
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156 } |
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157 |
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158 //============================================================================= |
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159 //DoConvertBufferL - sets iUnicodeBuffer to contain the converted characters, |
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160 //and iSourceBuffer to contain only the unconverted characters. |
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161 //============================================================================= |
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162 void CHtmlToCrtConvBuffer::DoConvertBufferL(TPtr8& aSourcePtr, TPtr16& aUnicodePtr, TInt& aSourceLength, TBool& aEndOfFile) |
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163 { |
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164 HBufC16* tempUnicode=HBufC16::NewLC(aSourceLength); |
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165 TPtr16 tempUnicodePtr(tempUnicode->Des()); |
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166 |
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167 //returnValue = number of unconverted characters at end of buffer |
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168 TInt returnValue=iCnvCharacterSetConverter.ConvertToUnicode(tempUnicodePtr, aSourcePtr, iState); |
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169 |
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170 if(!aEndOfFile) |
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171 { |
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172 if(returnValue==CCnvCharacterSetConverter::EErrorIllFormedInput) |
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173 User::Leave(KErrCorrupt); |
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174 } |
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175 if(returnValue<0)//future-proof against 'TError' expanding |
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176 User::Leave(KErrGeneral); |
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177 |
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178 aUnicodePtr.Append(tempUnicodePtr); |
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179 CleanupStack::PopAndDestroy(tempUnicode); |
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180 |
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181 //set iSourceBuffer to contain only the unconverted characters |
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182 aSourcePtr.Copy(aSourcePtr.Right(returnValue)); |
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183 aSourceLength=aSourcePtr.Length(); |
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184 } |