author | jjkang |
Fri, 11 Jun 2010 15:22:09 +0800 | |
changeset 2 | 806186ab5e14 |
parent 1 | 0a7b44b10206 |
permissions | -rw-r--r-- |
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// Copyright (c) 1996-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// f32\sfsrv\cl_ftext.cpp |
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// |
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// |
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#include "cl_std.h" |
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EXPORT_C TFileText::TFileText() |
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/** |
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Default constructor. |
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*/ |
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{} |
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EXPORT_C void TFileText::Set(RFile& aFile) |
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/** |
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Sets the Unicode file to be read from, or written to. |
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This function must be called before |
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Read(), Write() or Seek() can be used. |
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@param aFile The file to be used. Must be open. |
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@see TFileText::Read |
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@see TFileText::Write |
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@see TFileText::Seek |
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*/ |
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{ |
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iFile=aFile; |
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iReadBuf.Zero(); |
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iNext=(TText*)iReadBuf.Ptr(); |
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iEnd=iNext; |
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TInt pos = 0; |
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iFile.Seek(ESeekCurrent,pos); |
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if (pos == 0) |
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iState = EStartOfFile; |
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else |
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iState = ENormal; |
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} |
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EXPORT_C TInt TFileText::Read(TDes& aDes) |
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/** |
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Reads single line text record from a Unicode file into the specified descriptor. |
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The read operation begins at the current file position, and ends when |
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a line delimiter character is read. |
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If the maximum length of the descriptor is insufficient to hold the record, |
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the function returns KErrTooBig and the descriptor is filled to its maximum |
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length. |
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If Read() is called when the current position is the end of the file (that |
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is, after the last line delimiter in the file), KErrEof is returned, and the |
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length of the buffer is set to zero. |
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@param aDes On return, contains the single record read from the file. Any |
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previous contents are overwritten. |
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@return KErrNone if successful, otherwise one of the other system-wide error |
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codes. |
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*/ |
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{ |
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TText* pD=(TText*)aDes.Ptr(); |
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TInt len=aDes.MaxLength(); |
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TInt newLen=0; |
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while (newLen<len) |
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{ |
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if (iNext>=iEnd) |
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{ |
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TInt r=FillBuffer(); |
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if (r!=KErrNone && r!=KErrEof) |
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return(r); |
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if (r==KErrEof) |
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{ |
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aDes.SetLength(newLen); |
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return(newLen ? KErrNone : KErrEof); |
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} |
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continue; |
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} |
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TBool terminate=newLen; |
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TInt r=CheckForTerminator(terminate); |
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if (r!=KErrNone || terminate) |
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{ |
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aDes.SetLength(newLen); |
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return(r); |
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} |
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*pD++=(*iNext++); |
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newLen++; |
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} |
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aDes.SetLength(newLen); |
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TBool terminate=newLen; |
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TInt r=CheckForTerminator(terminate); |
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if (r!=KErrNone || terminate) |
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return(r); |
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NextRecord(); |
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return(KErrTooBig); |
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} |
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120 |
|
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121 |
void TFileText::NextRecord() |
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122 |
// |
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123 |
// Move to the start of the next record |
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124 |
// |
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125 |
{ |
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|
126 |
|
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127 |
FOREVER |
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|
128 |
{ |
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129 |
TBool terminate=EFalse; |
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130 |
TInt r=CheckForTerminator(terminate); |
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131 |
if (r!=KErrNone || terminate) |
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132 |
return; |
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133 |
iNext++; |
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134 |
} |
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|
135 |
} |
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|
136 |
|
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137 |
static void SwapWords(TText* aStart,TInt aCount) |
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138 |
{ |
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139 |
TUint8* p = (TUint8*)aStart; |
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140 |
while (aCount-- > 0) |
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141 |
{ |
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142 |
TUint8 temp = *p; |
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143 |
*p = p[1]; |
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144 |
p[1] = temp; |
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145 |
p += 2; |
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146 |
} |
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|
147 |
} |
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|
148 |
|
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149 |
TInt TFileText::FillBuffer() |
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150 |
// |
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151 |
// Read the new data from the file |
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152 |
// |
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153 |
{ |
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|
154 |
|
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155 |
TInt r=iFile.Read(iReadBuf); |
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156 |
if (r!=KErrNone) |
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157 |
return(r); |
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158 |
if (iReadBuf.Length()==0) |
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159 |
return(KErrEof); |
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160 |
iNext=(const TText*)iReadBuf.Ptr(); |
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161 |
iEnd=iNext+iReadBuf.Length()/sizeof(TText); |
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|
162 |
|
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163 |
// Use any leading byte order marker to determine endianness. |
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164 |
if (iState == EStartOfFile) |
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165 |
{ |
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166 |
iState = ENormal; |
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|
167 |
|
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|
168 |
// Ignore an ordinary byte order marker. |
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169 |
if (*iNext == 0xFEFF) |
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170 |
iNext++; |
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|
171 |
|
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|
172 |
// Set the endianness state to 'reverse' if a reversed byte order marker is found. |
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173 |
else if (*iNext == 0xFFFE) |
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|
174 |
{ |
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|
175 |
iNext++; |
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|
176 |
iState = EReverse; |
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|
177 |
} |
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|
178 |
|
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|
179 |
if (iNext == iEnd) |
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|
180 |
return KErrEof; |
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|
181 |
} |
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|
182 |
|
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|
183 |
if (iState == EReverse) |
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|
184 |
SwapWords((TText*)iNext,(iEnd - iNext)); |
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|
185 |
|
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|
186 |
return(KErrNone); |
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|
187 |
} |
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|
188 |
|
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|
189 |
TInt TFileText::CheckForTerminator(TBool& anAnswer) |
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|
190 |
// |
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|
191 |
// Return ETrue if the next char is a record terminator: PARAGRAPH SEPARATOR (U+2029), LINE SEPARATOR (U+2028), |
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|
192 |
// CR-LF (U+000D, U+000A), or LF (U+000A) |
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|
193 |
// |
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|
194 |
{ |
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|
195 |
|
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|
196 |
if (iNext>=iEnd) |
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|
197 |
{ |
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|
198 |
TInt r=FillBuffer(); |
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|
199 |
if (r!=KErrNone) |
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|
200 |
{ |
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|
201 |
if (r==KErrEof && anAnswer) |
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|
202 |
return(KErrNone); |
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|
203 |
return(r); |
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|
204 |
} |
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|
205 |
} |
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changeset
|
206 |
|
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|
207 |
anAnswer=EFalse; |
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|
208 |
const TText* oldNext=iNext; |
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|
209 |
TInt oldBufferLength=iReadBuf.Length(); |
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|
210 |
TText c=(*iNext); |
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|
211 |
TBool peek=EFalse; |
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changeset
|
212 |
|
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|
213 |
// Check for unambiguous paragraph or line separator. |
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|
214 |
if (c == 0x2029 || c == 0x2028) |
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|
215 |
{ |
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|
216 |
iNext++; |
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|
217 |
anAnswer = ETrue; |
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|
218 |
return KErrNone; |
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|
219 |
} |
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parents:
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changeset
|
220 |
|
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parents:
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|
221 |
// Check for CR-LF or LF. |
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|
222 |
if (c == 0x000D) |
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|
223 |
{ |
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|
224 |
iNext++; |
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|
225 |
if (iNext<iEnd) |
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|
226 |
c=(*iNext); |
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|
227 |
else |
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|
228 |
{ |
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|
229 |
peek=ETrue; |
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|
230 |
TInt r=FillBuffer(); |
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|
231 |
if (r!=KErrNone && r!=KErrEof) |
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|
232 |
return(r); |
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|
233 |
if (r==KErrNone) |
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|
234 |
c=(*iNext); |
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|
235 |
} |
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|
236 |
} |
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|
237 |
|
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|
238 |
if (c == 0x000A) |
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239 |
{ |
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240 |
iNext++; |
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241 |
anAnswer=ETrue; |
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return(KErrNone); |
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} |
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244 |
|
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iNext=oldNext; |
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246 |
if (!peek) |
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247 |
return(KErrNone); |
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248 |
|
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249 |
TInt pos=(-1)*(oldBufferLength+iReadBuf.Length()); |
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250 |
TInt r=iFile.Seek(ESeekCurrent,pos); |
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if (r==KErrNone) |
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r=FillBuffer(); |
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253 |
if (r!=KErrNone) |
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254 |
return(r); |
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255 |
iNext=oldNext; |
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256 |
return(KErrNone); |
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257 |
} |
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258 |
|
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259 |
|
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260 |
|
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261 |
|
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262 |
EXPORT_C TInt TFileText::Write(const TDesC& aDes) |
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263 |
/** |
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Writes the contents of a descriptor to the end of a Unicode file. |
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265 |
|
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A line delimiter is appended to the descriptor, and the current file position |
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is set to the new end of file. |
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268 |
|
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If the descriptor contains one or more paragraph delimiters, Read() will treat |
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the contents of the descriptor as more than one record. |
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271 |
|
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@param aDes The descriptor content to be appended to the file. |
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273 |
|
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274 |
@return KErrNone if successful, otherwise one of the other system-wide error |
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275 |
codes. |
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276 |
|
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277 |
@see TFileText::Read |
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278 |
*/ |
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279 |
{ |
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280 |
|
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281 |
TInt r=Seek(ESeekEnd); |
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282 |
if (r!=KErrNone) |
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283 |
return(r); |
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284 |
TPtrC8 writeBuf((const TUint8*)aDes.Ptr(),aDes.Size()); |
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285 |
r=iFile.Write(writeBuf); |
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286 |
if (r!=KErrNone) |
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287 |
return(r); |
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288 |
TText lf = 0x000A; |
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289 |
TPtrC8 lf8((const TUint8*)&lf,sizeof(TText)); |
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290 |
r=iFile.Write(lf8); |
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291 |
return(r); |
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292 |
} |
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293 |
|
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294 |
|
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295 |
|
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296 |
|
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297 |
EXPORT_C TInt TFileText::Seek(TSeek aMode) |
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298 |
/** |
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299 |
Seeks to start or end of file. |
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300 |
|
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301 |
It is only necessary to call this function before |
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302 |
using Read() because Write() always seeks to the end of the file |
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303 |
before writing. |
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304 |
|
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305 |
@param aMode ESeekStart to seek to the start of the file; |
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306 |
ESeekEnd to seek to the end. |
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307 |
|
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308 |
@return KErrNone if successful, otherwise one of the other system-wide error |
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309 |
codes. |
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310 |
|
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311 |
@panic FSCLIENT 5 if aMode is neither ESeekStart nor ESeekEnd. |
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312 |
|
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313 |
@see TFileText::Read |
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314 |
@see TFileText::Write |
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315 |
*/ |
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316 |
{ |
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317 |
|
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318 |
__ASSERT_ALWAYS(aMode==ESeekStart || aMode==ESeekEnd,Panic(EFTextIllegalSeekMode)); |
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319 |
TInt pos=0; |
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320 |
TInt ret=iFile.Seek(aMode,pos); |
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321 |
if (ret == 0 && aMode == ESeekStart) |
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322 |
iState = EStartOfFile; |
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323 |
iNext = (TText*)iReadBuf.Ptr(); |
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324 |
iEnd = iNext; |
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325 |
return ret; |
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|
326 |
} |
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|
327 |