/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tomcat.util.buf;
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.StandardCharsets;
import org.junit.Assert;
import org.junit.Test;
public class TestCharsetUtil {
/*
* Check the standard character sets return the expected values
*/
@Test
public void testIsAsciiSupersetStandardCharsets() {
Assert.assertTrue(CharsetUtil.isAsciiSuperset(StandardCharsets.US_ASCII));
Assert.assertTrue(CharsetUtil.isAsciiSuperset(StandardCharsets.ISO_8859_1));
Assert.assertTrue(CharsetUtil.isAsciiSuperset(StandardCharsets.UTF_8));
Assert.assertFalse(CharsetUtil.isAsciiSuperset(StandardCharsets.UTF_16));
Assert.assertFalse(CharsetUtil.isAsciiSuperset(StandardCharsets.UTF_16BE));
Assert.assertFalse(CharsetUtil.isAsciiSuperset(StandardCharsets.UTF_16LE));
}
/*
* More comprehensive test that checks that, apart from where the encoding
* overlaps with ASCII, no valid ASCII bytes are used.
*
* This is relatively slow.
* Only need to run this when we detect a new Charset.
*/
//@Test
public void testIsAsciiSupersetAll() {
for (Charset charset : Charset.availableCharsets().values()) {
System.out.println("Testing: " + charset.name());
if (CharsetUtil.isAsciiSuperset(charset)) {
// Run a more in-depth check to make sure
// Encoding Unicode 128 onwards should never generate bytes 0 to 127.
CharsetEncoder encoder = charset.newEncoder();
CharBuffer inChars = CharBuffer.allocate(8);
ByteBuffer outBytes;
for (int i = 128; i < Character.MAX_CODE_POINT; i++) {
inChars.clear();
char[] chars = Character.toChars(i);
for (char c : chars) {
inChars.append(c);
}
inChars.flip();
try {
outBytes = encoder.encode(inChars);
} catch (CharacterCodingException e) {
// Ignore. The encoding can't handle the codepoint. That is fine.
continue;
}
outBytes.flip();
while (outBytes.hasRemaining()) {
byte b = outBytes.get();
// All bytes should have the highest bit set
if ((b & 0x80) == 0) {
Assert.fail("[" + charset.name() + " is not a superset of ASCII");
}
}
}
} else {
System.out.println("Not: " + charset.name());
}
}
}
}