ebfc4513e0
Please note that the build will fail at the moment due to various checkstyle violations which should be fixed soon
82 lines
3.8 KiB
Java
82 lines
3.8 KiB
Java
/*
|
|
* Adaptation of http://bjoern.hoehrmann.de/utf-8/decoder/dfa/
|
|
*
|
|
* Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
|
|
*
|
|
* 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 io.netty.handler.codec.http.websocketx;
|
|
|
|
/**
|
|
* Checks UTF8 bytes for validity before converting it into a string
|
|
*/
|
|
final class UTF8Output {
|
|
private static final int UTF8_ACCEPT = 0;
|
|
private static final int UTF8_REJECT = 12;
|
|
|
|
private static final byte[] TYPES = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 11,
|
|
6, 6, 6, 5, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 };
|
|
|
|
private static final byte[] STATES = { 0, 12, 24, 36, 60, 96, 84, 12, 12, 12, 48, 72, 12, 12, 12, 12, 12, 12, 12,
|
|
12, 12, 12, 12, 12, 12, 0, 12, 12, 12, 12, 12, 0, 12, 0, 12, 12, 12, 24, 12, 12, 12, 12, 12, 24, 12, 24,
|
|
12, 12, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12,
|
|
12, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12,
|
|
12, 12, 12, 12, 12, 12, 12, 12 };
|
|
|
|
private int state = UTF8_ACCEPT;
|
|
private int codep;
|
|
|
|
private final StringBuilder stringBuilder;
|
|
|
|
UTF8Output(byte[] bytes) {
|
|
stringBuilder = new StringBuilder(bytes.length);
|
|
write(bytes);
|
|
}
|
|
|
|
public void write(byte[] bytes) {
|
|
for (byte b : bytes) {
|
|
write(b);
|
|
}
|
|
}
|
|
|
|
public void write(int b) {
|
|
byte type = TYPES[b & 0xFF];
|
|
|
|
codep = (state != UTF8_ACCEPT) ? (b & 0x3f) | (codep << 6) : (0xff >> type) & b;
|
|
|
|
state = STATES[state + type];
|
|
|
|
if (state == UTF8_ACCEPT) {
|
|
stringBuilder.append((char) codep);
|
|
} else if (state == UTF8_REJECT) {
|
|
throw new UTF8Exception("bytes are not UTF-8");
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
if (state != UTF8_ACCEPT) {
|
|
throw new UTF8Exception("bytes are not UTF-8");
|
|
}
|
|
return stringBuilder.toString();
|
|
}
|
|
}
|