/*
* Copyright (C) 2007 Steve Ratcliffe
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program 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 General Public License for more details.
*
*
* Author: Steve Ratcliffe
* Create date: Jan 1, 2008
*/
package uk.me.parabola.imgfmt.app.labelenc;
import uk.me.parabola.imgfmt.ExitException;
/**
* @author Steve Ratcliffe
*/
public class CodeFunctions
{
// Label encoding length
public static final int ENCODING_FORMAT6 =
6;
private static final int ENCODING_FORMAT9 =
9;
private static final int ENCODING_FORMAT10 =
10;
private int codepage
;
private int encodingType
;
private CharacterEncoder encoder
;
private CharacterDecoder decoder
;
protected void setEncoder
(CharacterEncoder encoder
) {
this.
encoder = encoder
;
}
public CharacterEncoder getEncoder
() {
return encoder
;
}
private void setDecoder
(CharacterDecoder decoder
) {
this.
decoder = decoder
;
}
public CharacterDecoder getDecoder
() {
return decoder
;
}
public int getEncodingType
() {
return encodingType
;
}
private void setEncodingType
(int encodingType
) {
this.
encodingType = encodingType
;
}
public int getCodepage
() {
return codepage
;
}
protected void setCodepage
(int codepage
) {
this.
codepage = codepage
;
}
/**
* Create a CharacterEncoder for the given charset option. Note that this
* routine also writes to the lblHeader parameter to set the encoding type.
* @param charset The mkgmap command line option to be interpreted.
* @return The various character set parameters that will be needed.
*/
public static CodeFunctions createEncoderForLBL
(String charset
) {
CodeFunctions funcs =
new CodeFunctions
();
switch (charset
) {
case "ascii":
funcs.
setEncodingType(ENCODING_FORMAT6
);
funcs.
setEncoder(new Format6Encoder
());
funcs.
setDecoder(new Format6Decoder
());
break;
case "cp0":
// This is used for ascii but with the single byte format
funcs.
setEncodingType(ENCODING_FORMAT9
);
funcs.
setEncoder(new AnyCharsetEncoder
("ascii",
new TableTransliterator
("ascii")));
funcs.
setDecoder(new AnyCharsetDecoder
("ascii"));
funcs.
setCodepage(0);
break;
case "cp1252":
case "latin1":
funcs.
setEncodingType(ENCODING_FORMAT9
);
funcs.
setEncoder(new AnyCharsetEncoder
("cp1252",
new TableTransliterator
("latin1")));
funcs.
setDecoder(new AnyCharsetDecoder
("cp1252"));
funcs.
setCodepage(1252);
break;
case "cp65001":
case "unicode":
funcs.
setEncodingType(ENCODING_FORMAT10
);
funcs.
setEncoder(new Utf8Encoder
());
funcs.
setDecoder(new Utf8Decoder
());
funcs.
setCodepage(65001);
break;
case "cp932":
case "ms932":
funcs.
setEncodingType(ENCODING_FORMAT10
);
funcs.
setEncoder(new AnyCharsetEncoder
("ms932",
new SparseTransliterator
("nomacron")));
funcs.
setDecoder(new AnyCharsetDecoder
("ms932"));
funcs.
setCodepage(932);
break;
default:
funcs.
setEncodingType(ENCODING_FORMAT9
);
funcs.
setDecoder(new AnyCharsetDecoder
(charset
));
funcs.
setEncoder(new AnyCharsetEncoder
(charset,
new TableTransliterator
("ascii")));
funcs.
setCodepage(guessCodepage
(charset
));
break;
}
return funcs
;
}
/**
* Sets encoding functions for a given format and code page. This is used
* when reading from an existing file.
*
* @param format The format from the lbl header.
* @param codePage The codepage found in the header.
* @return The various character set parameters that will be needed.
*/
public static CodeFunctions createEncoderForLBL
(int format,
int codePage
) {
CodeFunctions funcs
;
if (format == ENCODING_FORMAT6
) {
funcs = createEncoderForLBL
("ascii");
} else {
funcs = createEncoderForLBL
("cp" + codePage
);
}
return funcs
;
}
/**
* Guess the code page from the given charset. Only works with things
* like cp1252, windows-1252 and some well known ones.
* @param charset The charset that was given.
*/
private static int guessCodepage
(String charset
) {
String cs = charset.
toLowerCase();
if (cs.
startsWith("cp")) {
try {
return Integer.
parseInt(charset.
substring(2));
} catch (NumberFormatException e
) {
// wasn't in the right form
throw new ExitException
("Invalid character set: " + cs
);
}
} else if (cs.
startsWith("windows-")) {
try {
return Integer.
parseInt(charset.
substring(8));
} catch (NumberFormatException e
) {
// wasn't in the right form to guess
throw new ExitException
("Invalid character set: " + cs
);
}
} else if (cs.
equals("latin1")) {
return 1252;
}
return 0;
}
public static CharacterEncoder getDefaultEncoder
() {
return new Format6Encoder
();
}
public static CharacterDecoder getDefaultDecoder
() {
return new Format6Decoder
();
}
}