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decoding of names

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This commit is contained in:
Dirk Grobler 2001-07-05 10:51:31 +00:00
parent 9913bd27ec
commit f1a86fc520
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officecfg/org/openoffice/configuration/Decoder.java Normal file
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/*************************************************************************
*
* $RCSfile: Decoder.java,v $
*
* $Revision: 1.1 $
*
* last change: $Author: dg $ $Date: 2001-07-05 11:51:31 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://www.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
package org.openoffice.configuration;
/**
* Title: Decoder
* Description: decoding of set element names given encoded (base64)
*/
public class Decoder extends Object
{
//===========================================================
// decoding table
//===========================================================
static final int[] aModifiedBase64
= { 65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65,
65, 65, 65, 65, 65, 65, 65, 65, // !"#$%&'
65, 65, 65, 65, 65, 62, 63, 65, // ()*+,-./
52, 53, 54, 55, 56, 57, 58, 59, // 01234567
60, 61, 65, 65, 65, 65, 65, 65, // 89:;<=>?
65, 0, 1, 2, 3, 4, 5, 6, // @ABCDEFG
7, 8, 9, 10, 11, 12, 13, 14, // HIJKLMNO
15, 16, 17, 18, 19, 20, 21, 22, // PQRSTUVW
23, 24, 25, 65, 65, 65, 65, 64, // XYZ[\]^_
65, 26, 27, 28, 29, 30, 31, 32, // `abcdefg
33, 34, 35, 36, 37, 38, 39, 40, // hijklmno
41, 42, 43, 44, 45, 46, 47, 48, // pqrstuvw
49, 50, 51, 65, 65, 65, 65, 65 // xyz{|}~
};
static boolean isUsAsciiAlphaDigit(char c)
{
return isUsAsciiAlphaDigit(c,true);
}
static boolean isUsAsciiAlphaDigit(char c, boolean bDigitAllowed)
{
return c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z'
|| bDigitAllowed && c >= '0' && c <= '9';
}
static boolean write(int nUTF16Char, StringBuffer pBuffer, boolean bInitial)
{
if (isUsAsciiAlphaDigit((char)nUTF16Char, !bInitial)
|| !bInitial&& (nUTF16Char == (int)'-' || nUTF16Char == (int)'.'))
return false;
pBuffer.append((char)nUTF16Char);
return true;
}
//===========================================================
// return the next position after the decoded part
// or -1 if an invalid character was found
//===========================================================
static int decodeModifiedUTF7(String sSource, int nStartPos,
boolean bInitial, StringBuffer aBuffer)
{
final int nEnd = sSource.length();
int nUTF16Char = 0;
int nFilled = 0;
for (int nPos = nStartPos; nPos < nEnd; ++nPos)
{
char c = sSource.charAt(nPos);
int nc = (int)c;
int nDigit = nc < 128 ? aModifiedBase64[nc] : 65;
switch (nDigit)
{
default: // valid character
switch (nFilled)
{
case 2:
nUTF16Char |= nDigit >> 2;
if (!write(nUTF16Char, aBuffer, bInitial))
return -1;
break;
case 5:
nUTF16Char |= nDigit >> 4;
if (!write(nUTF16Char, aBuffer, bInitial))
return -1;
break;
case 7:
nUTF16Char |= nDigit;
if (!write(nUTF16Char, aBuffer, bInitial))
return -1;
break;
}
bInitial = false;
switch (nFilled)
{
case 0:
nUTF16Char = nDigit << 10;
++nFilled;
break;
case 1:
nUTF16Char |= nDigit << 4;
++nFilled;
break;
case 2:
nUTF16Char = (nDigit & 3) << 14;
++nFilled;
break;
case 3:
nUTF16Char |= nDigit << 8;
++nFilled;
break;
case 4:
nUTF16Char |= nDigit << 2;
++nFilled;
break;
case 5:
nUTF16Char = (nDigit & 15) << 12;
++nFilled;
break;
case 6:
nUTF16Char |= nDigit << 6;
++nFilled;
break;
case 7:
nFilled = 0;
break;
}
break;
case 64: // terminating '_'
switch (nFilled)
{
case 3:
case 6:
if (nUTF16Char != 0)
break;
case 0:
// success
return ++nPos;
}
case 65: // invalid character
return -1;
}
}
return -1;
}
// return null, if the string was invalid
public static String decode(String sSource)
{
StringBuffer aTarget = new StringBuffer();
final int nEnd = sSource.length();
int nPos = 0;
int nCopyEnd = 0;
while(nPos < nEnd)
{
char c = sSource.charAt(nPos);
if (!isUsAsciiAlphaDigit(c, nPos != 0))
switch (c)
{
case '_':
aTarget.append(sSource.substring(nCopyEnd, nPos ));
++nPos;
nPos = decodeModifiedUTF7(sSource, nPos, nPos == 1, aTarget);
//System.out.println("npos="+nPos);
if (nPos < 0)
return null;
nCopyEnd = nPos;
continue;
case '-':
case '.':
if (nPos != 0)
break;
default:
return null;
}
++nPos;
}
// System.out.println("Encoded string:" + sSource);
if (nCopyEnd == 0)
return sSource;
else
{
aTarget.append(sSource.substring(nCopyEnd));
// System.out.println("Decoded string:" + aTarget.toString());
return aTarget.toString();
}
}
public static void main(String args[])
{
if (args.length != 1)
System.out.println("Usage : Convert filname");
String str = Decoder.decode(args[0]);
if(str == null) {
System.out.println("Our String is null");
} else {
System.out.println("Our String " + str);
}
}
}