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package org.glassfish.tyrus.core;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
public class Utf8Utils {
public static byte[] encode(Charset charset, String string) {
CharsetEncoder ce = charset.newEncoder();
int en = scale(string.length(), ce.maxBytesPerChar());
byte[] ba = new byte[en];
if (string.length() == 0)
return ba;
ce.reset();
ByteBuffer bb = ByteBuffer.wrap(ba);
CharBuffer cb = CharBuffer.wrap(string);
try {
CoderResult cr = ce.encode(cb, bb, true);
if (!cr.isUnderflow())
cr.throwException();
cr = ce.flush(bb);
if (!cr.isUnderflow())
cr.throwException();
} catch (CharacterCodingException x) {
// Substitution is always enabled,
// so this shouldn't happen
throw new Error(x);
}
return safeTrim(ba, bb.position());
}
private static int scale(int len, float expansionFactor) {
// We need to perform double, not float, arithmetic; otherwise
// we lose low order bits when len is larger than 2**24.
return (int) (len * (double) expansionFactor);
}
// Trim the given byte array to the given length
//
private static byte[] safeTrim(byte[] ba, int len) {
if (len == ba.length
&& (System.getSecurityManager() == null)) {
return ba;
} else {
return copyOf(ba, len);
}
}
private static byte[] copyOf(byte[] original, int newLength) {
byte[] copy = new byte[newLength];
System.arraycopy(original, 0, copy, 0,
Math.min(original.length, newLength));
return copy;
}
}