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An HTML-checking library (used by https://html5.validator.nu and the HTML5 facet of the W3C Validator)
/*
* Copyright (c) 2006 Henri Sivonen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package nu.validator.io;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.Arrays;
public class NcrEscapingWindows1252OutputStreamWriter extends Writer {
private static final int SURROGATE_OFFSET = 0x10000 - (0xD800 << 10) - 0xDC00;
private static int[] CODE_POINTS = {
0x0152,
0x0153,
0x0160,
0x0161,
0x0178,
0x017D,
0x017E,
0x0192,
0x02C6,
0x02DC,
0x2013,
0x2014,
0x2018,
0x2019,
0x201A,
0x201C,
0x201D,
0x201E,
0x2020,
0x2021,
0x2022,
0x2026,
0x2030,
0x2039,
0x203A,
0x20AC,
0x2122
};
private static int[] BYTES = {
0x8C,
0x9C,
0x8A,
0x9A,
0x9F,
0x8E,
0x9E,
0x83,
0x88,
0x98,
0x96,
0x97,
0x91,
0x92,
0x82,
0x93,
0x94,
0x84,
0x86,
0x87,
0x95,
0x85,
0x89,
0x8B,
0x9B,
0x80,
0x99
};
private OutputStream out;
private int prev;
public NcrEscapingWindows1252OutputStreamWriter(OutputStream out) {
super();
this.out = out;
this.prev = 0;
}
@Override
public void write(char[] buf, int offset, int count) throws IOException {
int end = offset + count;
for (int i = offset; i < end; i++) {
this.write(buf[i]);
}
}
@Override
public void flush() throws IOException {
out.flush();
}
@Override
public void close() throws IOException {
out.close();
}
/**
* @see java.io.Writer#write(int)
*/
@Override
public void write(int c) throws IOException {
int i = -1;
c &= 0xFFFF; // per API contract
if (c < 0x80) {
out.write(c);
prev = 0;
return;
} else if (c < 0xA0) {
prev = 0;
// silent loss
return;
} else if (c < 0x100) {
out.write(c);
prev = 0;
return;
} else if ((i = Arrays.binarySearch(CODE_POINTS, c)) >= 0) {
out.write(BYTES[i]);
prev = 0;
return;
} if ((c & 0xFC00) == 0xDC00) {
// Got a low surrogate. See if prev was high surrogate
if (prev != 0) {
int intVal = (prev << 10) + c + SURROGATE_OFFSET;
prev = 0;
this.writeNcr(intVal);
return;
} else {
prev = 0;
// silent loss
return;
}
} else if ((c & 0xFC00) == 0xD800) {
// silent loss if prev already was surrogate
prev = c;
return;
} else {
this.writeNcr(c);
prev = 0;
return;
}
}
private void writeNcr(int c) throws IOException {
out.write('&');
out.write('#');
String str = Integer.toString(c);
for (int i = 0; i < str.length(); i++) {
out.write(str.charAt(i));
}
out.write(';');
}
}