/*
* $Id: UnicodeBigXMLDecoder.java,v 1.3 2004/06/25 17:22:37 cliffsch Exp $
*
* (C) Copyright 2002 by Yuval Oren. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.bluecast.xml;
import com.bluecast.io.CharsetDecoder;
import java.io.CharConversionException;
/**
* A decoder for big-endian Unicode text. Also converts
* carriage returns into linefeeds and CRLF into LF.
*
* @author Yuval Oren, yuval@bluecast.com
* @version $Revision: 1.3 $
*/
final public class UnicodeBigXMLDecoder
implements XMLDecoder {
private boolean sawCR = false;
public CharsetDecoder newCharsetDecoder() { return newXMLDecoder(); }
public XMLDecoder newXMLDecoder() { return new UnicodeBigXMLDecoder(); }
public int minBytesPerChar () {
return 2;
}
public int maxBytesPerChar () {
return 2;
}
public void reset() { sawCR = false; }
public void decode (byte[] in_buf, int in_off, int in_len, char[] out_buf,
int out_off, int out_len, int[] result) throws CharConversionException {
int i, o;
for (i = o = 0; i + 1 < in_len && o < out_len; i += 2) {
char c = (char)(((0xFF & in_buf[in_off + i]) << 8) | (0xFF & in_buf[
in_off + i + 1]));
if (c >= 0x20) {
if ((c <= 0xD7FF) ||
(c >= 0xE000 && c <= 0xFFFD) ||
(c >= 0x10000 && c <= 0x10FFFF)) {
sawCR = false;
out_buf[out_off + o++] = (char)c;
}
else
throw new CharConversionException(
"Illegal XML Character: 0x"+Integer.toHexString(c));
}
else {
switch (c) {
case '\n':
if (sawCR) {
sawCR = false;
}
else
out_buf[out_off + o++] = '\n';
break;
case '\r':
sawCR = true;
out_buf[out_off + o++] = '\n';
break;
case '\t':
out_buf[out_off + o++] = '\t';
break;
default:
throw new CharConversionException(
"Illegal XML character: 0x"
+ Integer.toHexString(c));
}
}
}
result[0] = i;
result[1] = o;
}
public void decodeXMLDecl (byte[] in_buf, int in_off, int in_len, char[] out_buf,
int out_off, int out_len, int[] result) throws CharConversionException {
int i, o;
inputLoop:
for (i = o = 0; i + 1 < in_len && o < out_len; i += 2) {
char c = (char)(((0xFF & in_buf[in_off + i]) << 8) | (0xFF & in_buf[
in_off + i + 1]));
if (c >= 0x20) {
if ((c <= 0xD7FF) ||
(c >= 0xE000 && c <= 0xFFFD) ||
(c >= 0x10000 && c <= 0x10FFFF)) {
sawCR = false;
out_buf[out_off + o++] = (char)c;
// XML declaration is definitely over. Stop decoding.
if (c == '>') {
i += 2;
break inputLoop;
}
}
else {
// Decoding error. Stop reading.
break inputLoop;
}
}
else {
switch (c) {
case '\n':
if (sawCR) {
sawCR = false;
}
else
out_buf[out_off + o++] = '\n';
break;
case '\r':
sawCR = true;
out_buf[out_off + o++] = '\n';
break;
case '\t':
out_buf[out_off + o++] = '\t';
break;
default:
// Illegal character. Stop reading.
break inputLoop;
}
}
}
result[0] = i;
result[1] = o;
}
}