author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 22 Jan 2010 11:03:55 +0200 | |
changeset 12 | 0bf4040442f9 |
parent 9 | 96e5fb8b040d |
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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#ifndef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API |
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iFile=aFile; |
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#else |
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iFile=(RFile64&)aFile; |
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#endif |
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iReadBuf.Zero(); |
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iNext=(TText*)iReadBuf.Ptr(); |
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iEnd=iNext; |
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#ifndef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API |
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TInt pos = 0; |
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#else |
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TInt64 pos = 0; |
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#endif |
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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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105 |
return(newLen ? KErrNone : KErrEof); |
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|
106 |
} |
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|
107 |
continue; |
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|
108 |
} |
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|
109 |
TBool terminate=newLen; |
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|
110 |
TInt r=CheckForTerminator(terminate); |
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|
111 |
if (r!=KErrNone || terminate) |
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|
112 |
{ |
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|
113 |
aDes.SetLength(newLen); |
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|
114 |
return(r); |
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|
115 |
} |
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|
116 |
*pD++=(*iNext++); |
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|
117 |
newLen++; |
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|
118 |
} |
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|
119 |
aDes.SetLength(newLen); |
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|
120 |
TBool terminate=newLen; |
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|
121 |
TInt r=CheckForTerminator(terminate); |
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|
122 |
if (r!=KErrNone || terminate) |
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|
123 |
return(r); |
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NextRecord(); |
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return(KErrTooBig); |
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|
126 |
} |
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127 |
|
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128 |
void TFileText::NextRecord() |
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129 |
// |
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// Move to the start of the next record |
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131 |
// |
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132 |
{ |
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|
133 |
|
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134 |
FOREVER |
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|
135 |
{ |
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136 |
TBool terminate=EFalse; |
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|
137 |
TInt r=CheckForTerminator(terminate); |
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|
138 |
if (r!=KErrNone || terminate) |
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|
139 |
return; |
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|
140 |
iNext++; |
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|
141 |
} |
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|
142 |
} |
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|
143 |
|
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|
144 |
static void SwapWords(TText* aStart,TInt aCount) |
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|
145 |
{ |
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|
146 |
TUint8* p = (TUint8*)aStart; |
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|
147 |
while (aCount-- > 0) |
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|
148 |
{ |
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|
149 |
TUint8 temp = *p; |
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|
150 |
*p = p[1]; |
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|
151 |
p[1] = temp; |
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|
152 |
p += 2; |
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|
153 |
} |
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|
154 |
} |
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|
155 |
|
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|
156 |
TInt TFileText::FillBuffer() |
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|
157 |
// |
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|
158 |
// Read the new data from the file |
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|
159 |
// |
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|
160 |
{ |
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|
161 |
|
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|
162 |
TInt r=iFile.Read(iReadBuf); |
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|
163 |
if (r!=KErrNone) |
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|
164 |
return(r); |
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|
165 |
if (iReadBuf.Length()==0) |
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|
166 |
return(KErrEof); |
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Revision: 200951
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parents:
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|
167 |
iNext=(const TText*)iReadBuf.Ptr(); |
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|
168 |
iEnd=iNext+iReadBuf.Length()/sizeof(TText); |
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|
169 |
|
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|
170 |
// Use any leading byte order marker to determine endianness. |
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|
171 |
if (iState == EStartOfFile) |
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|
172 |
{ |
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Revision: 200951
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|
173 |
iState = ENormal; |
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|
174 |
|
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Revision: 200951
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|
175 |
// Ignore an ordinary byte order marker. |
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|
176 |
if (*iNext == 0xFEFF) |
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|
177 |
iNext++; |
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|
178 |
|
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|
179 |
// Set the endianness state to 'reverse' if a reversed byte order marker is found. |
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|
180 |
else if (*iNext == 0xFFFE) |
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|
181 |
{ |
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|
182 |
iNext++; |
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Revision: 200951
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|
183 |
iState = EReverse; |
96e5fb8b040d
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|
184 |
} |
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|
185 |
|
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Revision: 200951
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|
186 |
if (iNext == iEnd) |
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Revision: 200951
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|
187 |
return KErrEof; |
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|
188 |
} |
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|
189 |
|
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|
190 |
if (iState == EReverse) |
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Revision: 200951
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|
191 |
SwapWords((TText*)iNext,(iEnd - iNext)); |
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|
192 |
|
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|
193 |
return(KErrNone); |
96e5fb8b040d
Revision: 200951
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parents:
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|
194 |
} |
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|
195 |
|
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|
196 |
TInt TFileText::CheckForTerminator(TBool& anAnswer) |
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|
197 |
// |
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|
198 |
// Return ETrue if the next char is a record terminator: PARAGRAPH SEPARATOR (U+2029), LINE SEPARATOR (U+2028), |
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|
199 |
// CR-LF (U+000D, U+000A), or LF (U+000A) |
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|
200 |
// |
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|
201 |
{ |
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|
202 |
|
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parents:
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|
203 |
if (iNext>=iEnd) |
96e5fb8b040d
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|
204 |
{ |
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|
205 |
TInt r=FillBuffer(); |
96e5fb8b040d
Revision: 200951
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|
206 |
if (r!=KErrNone) |
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|
207 |
{ |
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Revision: 200951
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parents:
diff
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|
208 |
if (r==KErrEof && anAnswer) |
96e5fb8b040d
Revision: 200951
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diff
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|
209 |
return(KErrNone); |
96e5fb8b040d
Revision: 200951
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parents:
diff
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|
210 |
return(r); |
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Revision: 200951
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diff
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|
211 |
} |
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} |
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|
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anAnswer=EFalse; |
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const TText* oldNext=iNext; |
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TInt oldBufferLength=iReadBuf.Length(); |
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TText c=(*iNext); |
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TBool peek=EFalse; |
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219 |
|
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// Check for unambiguous paragraph or line separator. |
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if (c == 0x2029 || c == 0x2028) |
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{ |
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iNext++; |
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anAnswer = ETrue; |
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return KErrNone; |
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} |
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227 |
|
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// Check for CR-LF or LF. |
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if (c == 0x000D) |
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{ |
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iNext++; |
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if (iNext<iEnd) |
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c=(*iNext); |
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else |
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{ |
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peek=ETrue; |
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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==KErrNone) |
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c=(*iNext); |
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} |
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} |
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244 |
|
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if (c == 0x000A) |
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{ |
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iNext++; |
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anAnswer=ETrue; |
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return(KErrNone); |
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} |
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251 |
|
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iNext=oldNext; |
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if (!peek) |
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return(KErrNone); |
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255 |
|
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#ifndef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API |
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TInt pos=(-1)*(oldBufferLength+iReadBuf.Length()); |
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#else |
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TInt64 pos=(-1)*(oldBufferLength+iReadBuf.Length()); |
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#endif |
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TInt r=iFile.Seek(ESeekCurrent,pos); |
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if (r==KErrNone) |
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r=FillBuffer(); |
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if (r!=KErrNone) |
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return(r); |
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iNext=oldNext; |
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return(KErrNone); |
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} |
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269 |
|
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|
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271 |
|
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272 |
|
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EXPORT_C TInt TFileText::Write(const TDesC& aDes) |
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/** |
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Writes the contents of a descriptor to the end of a Unicode file. |
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276 |
|
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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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279 |
|
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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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282 |
|
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@param aDes The descriptor content to be appended to the file. |
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284 |
|
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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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287 |
|
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@see TFileText::Read |
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*/ |
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290 |
{ |
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291 |
|
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TInt r=Seek(ESeekEnd); |
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if (r!=KErrNone) |
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return(r); |
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TPtrC8 writeBuf((const TUint8*)aDes.Ptr(),aDes.Size()); |
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r=iFile.Write(writeBuf); |
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if (r!=KErrNone) |
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return(r); |
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TText lf = 0x000A; |
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TPtrC8 lf8((const TUint8*)&lf,sizeof(TText)); |
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r=iFile.Write(lf8); |
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302 |
return(r); |
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303 |
} |
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|
304 |
|
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|
305 |
|
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306 |
|
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307 |
|
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EXPORT_C TInt TFileText::Seek(TSeek aMode) |
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309 |
/** |
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Seeks to start or end of file. |
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311 |
|
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312 |
It is only necessary to call this function before |
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using Read() because Write() always seeks to the end of the file |
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before writing. |
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315 |
|
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316 |
@param aMode ESeekStart to seek to the start of the file; |
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317 |
ESeekEnd to seek to the end. |
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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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@panic FSCLIENT 5 if aMode is neither ESeekStart nor ESeekEnd. |
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@see TFileText::Read |
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@see TFileText::Write |
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*/ |
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{ |
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__ASSERT_ALWAYS(aMode==ESeekStart || aMode==ESeekEnd,Panic(EFTextIllegalSeekMode)); |
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#ifndef SYMBIAN_ENABLE_64_BIT_FILE_SERVER_API |
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TInt pos=0; |
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#else |
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TInt64 pos = 0; |
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#endif |
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TInt ret=iFile.Seek(aMode,pos); |
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if (ret == 0 && aMode == ESeekStart) |
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iState = EStartOfFile; |
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iNext = (TText*)iReadBuf.Ptr(); |
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iEnd = iNext; |
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return ret; |
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} |
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