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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// 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.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.util;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
/**
* Converts bytes in ASN.1 UniversalString character set to UniversalString
* characters.
*
* @author Lily Hsiao
* @author Slava Galperin
*/
public class UniversalCharsetDecoder extends CharsetDecoder {
public UniversalCharsetDecoder(Charset cs) {
super(cs, 0.25f, 1);
}
protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) {
while (true) {
// XXX we do not know what to do with truly UCS-4 characters here
// we also assumed network byte order
if (in.remaining() < 4)
return CoderResult.UNDERFLOW;
in.mark();
byte b0 = in.get();
byte b1 = in.get();
byte b2 = in.get();
byte b3 = in.get();
if (CodingErrorAction.REPORT == unmappableCharacterAction() &&
!((b0 == 0 && b1 == 0) || (b2 == 0 && b3 == 0))) {
return CoderResult.unmappableForLength(4);
}
char c;
if (b2 == 0 && b3 == 0) {
// Try to be a bit forgiving. If the byte order is
// reversed, we still try handle it.
// Sample Date Set (1):
// 0000000 f 0 \0 \0 213 0 \0 \0 S 0 \0 \0
// 0000014
// Sample Date Set (2):
// 0000000 w \0 \0 \0 w \0 \0 \0 w \0 \0 \0 . \0 \0 \0
// 0000020 ( \0 \0 \0 t \0 \0 \0 o \0 \0 \0 b \0 \0 \0
// 0000040 e \0 \0 \0 | \0 \0 \0 n \0 \0 \0 o \0 \0 \0
// 0000060 t \0 \0 \0 t \0 \0 \0 o \0 \0 \0 b \0 \0 \0
// 0000100 e \0 \0 \0 ) \0 \0 \0 . \0 \0 \0 c \0 \0 \0
// 0000120 o \0 \0 \0 m \0 \0 \0
// 0000130
c = (char) (((b1 << 8) & 0xff00) + (b0 & 0x00ff));
} else { // (b0 == 0 && b1 == 0)
// This should be the right order.
//
// 0000000 0000 00c4 0000 0064 0000 006d 0000 0069
// 0000020 0000 006e 0000 0020 0000 0051 0000 0041
// 0000040
c = (char) (((b2 << 8) & 0xff00) + (b3 & 0x00ff));
}
if (out.remaining() < 1) {
in.reset();
return CoderResult.OVERFLOW;
}
out.put(c);
}
}
}
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