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/**
* Copyright (c) 2009-2014 Zauber S.A.
*
* 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 ar.com.zauber.leviathan.impl.httpclient.charset;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import ar.com.zauber.leviathan.common.CharsetStrategy;
import ar.com.zauber.leviathan.common.ResponseMetadata;
/**
* A {@link CharsetStrategy} that detects the charset taking into
* account the byte order mark.
*
* @author Guido Marucci Blas
* @since 31/07/2012
* @see http://en.wikipedia.org/wiki/Byte_order_mark
*/
public final class ByteOrderMarkCharsetStrategy implements CharsetStrategy {
@SuppressWarnings("serial")
private static final List BOM_LIST = new ArrayList() {{
add(new ByteOrderMark(Charset.forName("UTF-8"), new byte[]{ (byte)0xEF, (byte)0xBB, (byte)0xBF }));
add(new ByteOrderMark(Charset.forName("UTF-16BE"), new byte[]{ (byte)0xFE, (byte)0xFF }));
add(new ByteOrderMark(Charset.forName("UTF-16LE"), new byte[]{ (byte)0xFF, (byte)0xFE }));
add(new ByteOrderMark(Charset.forName("UTF-32BE"), new byte[]{ (byte)0x00, (byte)0x00, (byte)0xFE, (byte)0xFF }));
add(new ByteOrderMark(Charset.forName("UTF-32LE"), new byte[]{ (byte)0xFF, (byte)0xFE, (byte)0x00, (byte)0x00 }));
// add(new ByteOrderMark(Charset.forName("UTF-7"), new byte[]{ (byte)0x2B, (byte)0x2F, (byte)0x76, (byte)0x38 }));
// add(new ByteOrderMark(Charset.forName("UTF-7"), new byte[]{ (byte)0x2B, (byte)0x2F, (byte)0x76, (byte)0x39 }));
// add(new ByteOrderMark(Charset.forName("UTF-7"), new byte[]{ (byte)0x2B, (byte)0x2F, (byte)0x76, (byte)0x2B }));
// add(new ByteOrderMark(Charset.forName("UTF-7"), new byte[]{ (byte)0x2B, (byte)0x2F, (byte)0x76, (byte)0x2F }));
// add(new ByteOrderMark(Charset.forName("UTF-1"), new byte[]{ (byte)0xF7, (byte)0x64, (byte)0x4C }));
// add(new ByteOrderMark(Charset.forName("UTF-EBCDIC"), new byte[]{ (byte)0xDD, (byte)0x73, (byte)0x66, (byte)0x73 }));
// add(new ByteOrderMark(Charset.forName("SCSU"), new byte[]{ (byte)0x0E, (byte)0xFE, (byte)0xFF }));
// add(new ByteOrderMark(Charset.forName("BOCU-1"), new byte[]{ (byte)0xFB, (byte)0xEE, (byte)0x28 }));
// add(new ByteOrderMark(Charset.forName("GB-18030"), new byte[]{ (byte)0x84, (byte)0x31, (byte)0x95, (byte)0x33 }));
}};
@Override
public Charset getCharset(final ResponseMetadata meta, final InputStream content) {
Charset detectedCharset = null;
try {
final byte[] bytes = new byte[4];
if (content.read(bytes, 0, 4) == 4) {
for (final ByteOrderMark bom : BOM_LIST) {
final byte[] copy = Arrays.copyOf(bytes, bom.bytes.length);
if (Arrays.equals(bom.bytes, copy)) {
detectedCharset = bom.charset;
throw new SkipBytesException(bom.bytes.length, detectedCharset);
}
}
}
} catch (final IOException e) {
// Nothing to be done
}
return detectedCharset;
}
private static final class ByteOrderMark {
private final Charset charset;
private final byte[] bytes;
/**
* Creates the ByteOrderMark.
*
* @param charset
* @param bytes
*/
public ByteOrderMark(final Charset charset, final byte[] bytes) {
this.charset = charset;
this.bytes = bytes;
}
}
}
