author | John Imhofe <john.imhofe@nokia.com> |
Mon, 21 Dec 2009 16:14:42 +0000 | |
changeset 15 | 4122176ea935 |
permissions | -rw-r--r-- |
15
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// Copyright (c) 2007-2009 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 "Symbian Foundation License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/sfl-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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// |
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#include <e32std.h> |
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#include <e32std_private.h> |
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#include <e32def.h> |
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#include <e32def_private.h> |
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#include <e32des8.h> |
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#include <e32des8_private.h> |
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#include "unicodeconv.h" |
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//This function converts from Unicoded characters, to foreign characters and adds them into a descriptor |
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TInt UnicodeConv::ConvertFromUnicodeL(TDes8& aForeign, const TDesC16& aUnicode, const TDesC8& aReplacementChar, TFatUtilityFunctions::TOverflowAction aOA) |
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{ |
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const TInt unicodeLength = aUnicode.Length(); |
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aForeign.Zero(); |
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|
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//loop going through the character of the unicode descriptor |
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for(TInt i=0; i<unicodeLength; i++) |
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{ |
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const TUint16 unicodeChar = aUnicode[i]; |
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// if the output buffer is already full, leave with KErrOverflow |
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if ( aForeign.Length() == aForeign.MaxLength() ) |
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{ |
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if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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{ |
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User::Leave(KErrBadName); |
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} |
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else |
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{ |
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break; |
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} |
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} |
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//charcters from 0x0000 to 0x007F, can be mapped directly |
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if(unicodeChar<0x0080) |
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{ |
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aForeign.Append(static_cast<TUint8>(unicodeChar)); |
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} |
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else |
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{ |
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TInt trailByte = KErrNotFound; |
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TInt returnValue = TConvDataStruct::ConvertSingleUnicode(unicodeChar,trailByte); |
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|
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if(returnValue!=KErrNotFound) |
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{ |
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if(trailByte!=KErrNotFound) |
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{ |
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aForeign.Append(static_cast<TUint8>(returnValue)); |
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|
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// as two bytes are being added check enough space for second |
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if ( aForeign.Length() == aForeign.MaxLength() ) |
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{ |
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if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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{ |
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User::Leave(KErrBadName); |
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} |
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else |
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{ |
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break; |
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} |
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} |
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aForeign.Append(static_cast<TUint8>(trailByte)); |
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} |
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else |
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{ |
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aForeign.Append(static_cast<TUint8>(returnValue)); |
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} |
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} |
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else |
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{ |
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aForeign.Append(aReplacementChar); |
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} |
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} |
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} |
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|
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return KErrNone; |
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} |
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|
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//This function converts from foreign characters into unicode and adds them into a descriptor |
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TInt UnicodeConv::ConvertToUnicodeL(TDes16& aUnicode, const TDesC8& aForeign, TFatUtilityFunctions::TOverflowAction aOA) |
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{ |
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const TInt foreignLength = aForeign.Length(); |
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aUnicode.Zero(); |
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|
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//loop going through the characters of the foreign descriptor |
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for(TInt i = 0; i<foreignLength; i++) |
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{ |
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const TUint8 leadForeign = aForeign[i]; |
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TUint8 tailForeign = 0x00; |
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|
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// Check there is enough space in the output buffer, and leave with KErrOverflow if not |
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if ( aUnicode.Length() == aUnicode.MaxLength() ) |
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{ |
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if (aOA == TFatUtilityFunctions::EOverflowActionLeave) |
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{ |
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User::Leave(KErrBadName); |
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} |
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else |
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break; |
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} |
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} |
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//charcters from 0x00 to 0x7F, can be mapped directly |
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if(leadForeign < 0x80) |
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aUnicode.Append(static_cast<TUint16>(leadForeign)); |
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else |
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{ |
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if((i+1)<foreignLength) |
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tailForeign = aForeign[i+1]; |
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|
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const TLeadOrSingle* structPtr = TConvDataStruct::KFirstByteConversions + (leadForeign-0x80); |
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|
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if(structPtr->iUnicodeIfSingle) |
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aUnicode.Append(structPtr->iUnicodeIfSingle); |
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else |
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{ |
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if(TConvDataStruct::KMinTrailByte<=tailForeign && tailForeign<=TConvDataStruct::KMaxTrailByte) |
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aUnicode.Append(TConvDataStruct::KDoubleByteConversions[structPtr->iDoubleByteIndex+ |
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(tailForeign - TConvDataStruct::KMinTrailByte)]); |
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else |
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aUnicode.Append(0xFFFD); |
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i++; |
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} |
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} |
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} |
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|
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return KErrNone; |
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} |
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|
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TBool UnicodeConv::IsLegalShortNameCharacter (TUint aCharacter) |
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{ |
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//1. aCharacter >= 0x0080 |
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if (aCharacter>=0x0080) |
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{ |
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if (aCharacter>0xFFFF) |
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return EFalse; |
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|
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TInt trailByte = KErrNotFound; |
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TInt returnValue = TConvDataStruct::ConvertSingleUnicode(aCharacter,trailByte); |
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|
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if(returnValue!=KErrNotFound) |
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return ETrue; |
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else |
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return EFalse; |
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} |
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|
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// For most common cases: |
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// Note: lower case characters are considered legal DOS char here. |
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if ((aCharacter>='a' && aCharacter<='z') || |
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(aCharacter>='A' && aCharacter<='Z') || |
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(aCharacter>='0' && aCharacter<='9')) |
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{ |
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return ETrue; |
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} |
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// Checking for illegal chars: |
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// 2. aCharacter <= 0x20 |
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// Note: leading 0x05 byte should be guarded by callers of this function |
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// as the information of the position of the character is required. |
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if (aCharacter < 0x20) |
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return EFalse; |
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// Space (' ') is not considered as a legal DOS char here. |
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if (aCharacter == 0x20) |
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return EFalse; |
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|
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// 3. 0x20 < aCharacter < 0x80 |
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// According to FAT Spec, "following characters are not legal in any bytes of DIR_Name": |
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switch (aCharacter) |
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{ |
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case 0x22: // '"' |
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case 0x2A: // '*' |
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case 0x2B: // '+' |
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case 0x2C: // ',' |
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//case 0x2E: // '.' // Although '.' is not allowed in any bytes of DIR_Name, it |
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// is a valid character in short file names. |
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case 0x2F: // '/' |
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case 0x3A: // ':' |
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case 0x3B: // ';' |
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case 0x3C: // '<' |
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case 0x3D: // '=' |
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case 0x3E: // '>' |
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case 0x3F: // '?' |
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case 0x5B: // '[' |
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case 0x5C: // '\' |
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case 0x5D: // ']' |
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case 0x7C: // '|' |
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return EFalse; |
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default: |
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return ETrue; |
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} |
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} |
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206 |