io.undertow.websockets.core.UTF8Output Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.websockets.core;
import org.xnio.Buffers;
import java.nio.ByteBuffer;
/**
* Utility class which allows to extract a UTF8 String from bytes respecting valid code-points
*/
public final class UTF8Output {
private static final int UTF8_ACCEPT = 0;
private static final byte HIGH_BIT = (byte) (1 << 7);
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};
@SuppressWarnings("RedundantFieldInitialization")
private byte state = UTF8_ACCEPT;
private int codep;
private final StringBuilder stringBuilder;
public UTF8Output(ByteBuffer... payload) {
stringBuilder = new StringBuilder((int) Buffers.remaining(payload));
write(payload);
}
public UTF8Output() {
stringBuilder = new StringBuilder();
}
public void write(ByteBuffer... bytes) {
for (ByteBuffer buf : bytes) {
while (buf.hasRemaining()) {
write(buf.get());
}
}
}
private void write(byte b) {
if(state == UTF8_ACCEPT && (b & HIGH_BIT) == 0) {
stringBuilder.append((char)b);
return;
}
byte type = TYPES[b & 0xFF];
codep = state != UTF8_ACCEPT ? b & 0x3f | codep << 6 : 0xff >> type & b;
state = STATES[state + type];
if (state == UTF8_ACCEPT) {
for (char c : Character.toChars(codep)) {
stringBuilder.append(c);
}
}
}
/**
* Extract a String holding the utf8 text
*/
public String extract() {
String text = stringBuilder.toString();
stringBuilder.setLength(0);
return text;
}
public boolean hasData() {
return stringBuilder.length() != 0;
}
}