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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 sun.io.ByteToCharUnicodeBig;
import sun.io.ByteToCharUnicodeLittle;
import sun.io.ConversionBufferFullException;
import sun.io.MalformedInputException;
/**
* Convert byte arrays containing Unicode characters into arrays of actual
* Unicode characters, sensing the byte order automatically. To force a
* particular byte order, use either the "UnicodeBig" or the "UnicodeLittle"
* encoding.
*
* If the first character is a byte order mark, it will be interpreted and
* discarded. Otherwise, the byte order is assumed to be BigEndian.
* Either way, the byte order is decided by the first character. Later
* byte order marks will be passed through as characters (if they indicate
* the same byte order) or will cause an error (if they indicate the other
* byte order).
*
* @see ByteToCharUnicodeLittle
* @see ByteToCharUnicodeBig
*
* @version 1.3, 96/11/23
* @author Mark Reinhold
*/
public class ByteToCharUnicode extends sun.io.ByteToCharConverter {
static final char BYTE_ORDER_MARK = (char) 0xfeff;
static final char REVERSED_MARK = (char) 0xfffe;
static final int AUTO = 0;
static final int BIG = 1;
static final int LITTLE = 2;
int byteOrder;
public ByteToCharUnicode() {
byteOrder = AUTO;
}
public String getCharacterEncoding() {
switch (byteOrder) {
case BIG: return "UnicodeBig";
case LITTLE: return "UnicodeLittle";
default: return "Unicode";
}
}
boolean started = false;
int leftOverByte;
boolean leftOver = false;
public int convert(byte[] in, int inOff, int inEnd,
char[] out, int outOff, int outEnd)
throws ConversionBufferFullException, MalformedInputException
{
byteOff = inOff;
charOff = outOff;
if (inOff >= inEnd)
return 0;
int b1, b2;
int bc = 0;
int inI = inOff, outI = outOff;
if (leftOver) {
b1 = leftOverByte & 0xff;
leftOver = false;
}
else
b1 = in[inI++] & 0xff;
bc = 1;
if (!started) { /* Read possible initial byte-order mark */
if (inI < inEnd) {
b2 = in[inI++] & 0xff;
bc = 2;
char c = (char) ((b1 << 8) | b2);
int bo = AUTO;
if (c == BYTE_ORDER_MARK)
bo = BIG;
else if (c == REVERSED_MARK)
bo = LITTLE;
if (byteOrder == AUTO) {
if (bo == AUTO) {
bo = BIG; // BigEndian by default
}
byteOrder = bo;
if (inI < inEnd) {
b1 = in[inI++] & 0xff;
bc = 1;
}
}
else if (bo == AUTO) {
inI--;
bc = 1;
}
else if (byteOrder == bo) {
if (inI < inEnd) {
b1 = in[inI++] & 0xff;
bc = 1;
}
}
else {
badInputLength = bc;
throw new
MalformedInputException("Incorrect byte-order mark");
}
started = true;
}
}
/* Loop invariant: (b1 contains the next input byte) && (bc == 1) */
while (inI < inEnd) {
b2 = in[inI++] & 0xff;
bc = 2;
char c;
if (byteOrder == BIG)
c = (char) ((b1 << 8) | b2);
else
c = (char) ((b2 << 8) | b1);
if (c == REVERSED_MARK)
throw new
MalformedInputException("Reversed byte-order mark");
if (outI >= outEnd)
throw new ConversionBufferFullException();
out[outI++] = c;
byteOff = inI;
charOff = outI;
if (inI < inEnd) {
b1 = in[inI++] & 0xff;
bc = 1;
}
}
if (bc == 1) {
leftOverByte = b1;
leftOver = true;
}
return outI - outOff;
}
public void reset() {
leftOver = false;
byteOff = charOff = 0;
}
public int flush(char buf[], int off, int len)
throws MalformedInputException
{
if (leftOver) {
reset();
throw new MalformedInputException();
}
byteOff = charOff = 0;
return 0;
}
}
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