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/*
* 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.tools.zip;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.UnsupportedCharsetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* Static helper functions for robustly encoding filenames in zip files.
*/
public abstract class ZipEncodingHelper {
/**
* A class, which holds the high characters of a simple encoding
* and lazily instantiates a Simple8BitZipEncoding instance in a
* thread-safe manner.
*/
private static class SimpleEncodingHolder {
private final char[] highChars;
private Simple8BitZipEncoding encoding;
/**
* Instantiate a simple encoding holder.
*
* @param highChars The characters for byte codes 128 to 255.
*
* @see Simple8BitZipEncoding#Simple8BitZipEncoding(char[])
*/
SimpleEncodingHolder(final char[] highChars) {
this.highChars = highChars;
}
/**
* @return The associated {@link Simple8BitZipEncoding}, which
* is instantiated if not done so far.
*/
public synchronized Simple8BitZipEncoding getEncoding() {
if (this.encoding == null) {
this.encoding = new Simple8BitZipEncoding(this.highChars);
}
return this.encoding;
}
}
private static final Map simpleEncodings;
static {
final Map se =
new HashMap();
final char[] cp437_high_chars =
new char[] {0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0,
0x00e5, 0x00e7, 0x00ea, 0x00eb, 0x00e8, 0x00ef,
0x00ee, 0x00ec, 0x00c4, 0x00c5, 0x00c9, 0x00e6,
0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5,
0x20a7, 0x0192, 0x00e1, 0x00ed, 0x00f3, 0x00fa,
0x00f1, 0x00d1, 0x00aa, 0x00ba, 0x00bf, 0x2310,
0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561,
0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557,
0x255d, 0x255c, 0x255b, 0x2510, 0x2514, 0x2534,
0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550,
0x256c, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559,
0x2558, 0x2552, 0x2553, 0x256b, 0x256a, 0x2518,
0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3,
0x00b5, 0x03c4, 0x03a6, 0x0398, 0x03a9, 0x03b4,
0x221e, 0x03c6, 0x03b5, 0x2229, 0x2261, 0x00b1,
0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2,
0x25a0, 0x00a0};
final SimpleEncodingHolder cp437 = new SimpleEncodingHolder(cp437_high_chars);
se.put("CP437", cp437);
se.put("Cp437", cp437);
se.put("cp437", cp437);
se.put("IBM437", cp437);
se.put("ibm437", cp437);
final char[] cp850_high_chars =
new char[] {0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0,
0x00e5, 0x00e7, 0x00ea, 0x00eb, 0x00e8, 0x00ef,
0x00ee, 0x00ec, 0x00c4, 0x00c5, 0x00c9, 0x00e6,
0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
0x00ff, 0x00d6, 0x00dc, 0x00f8, 0x00a3, 0x00d8,
0x00d7, 0x0192, 0x00e1, 0x00ed, 0x00f3, 0x00fa,
0x00f1, 0x00d1, 0x00aa, 0x00ba, 0x00bf, 0x00ae,
0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x00c1,
0x00c2, 0x00c0, 0x00a9, 0x2563, 0x2551, 0x2557,
0x255d, 0x00a2, 0x00a5, 0x2510, 0x2514, 0x2534,
0x252c, 0x251c, 0x2500, 0x253c, 0x00e3, 0x00c3,
0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550,
0x256c, 0x00a4, 0x00f0, 0x00d0, 0x00ca, 0x00cb,
0x00c8, 0x0131, 0x00cd, 0x00ce, 0x00cf, 0x2518,
0x250c, 0x2588, 0x2584, 0x00a6, 0x00cc, 0x2580,
0x00d3, 0x00df, 0x00d4, 0x00d2, 0x00f5, 0x00d5,
0x00b5, 0x00fe, 0x00de, 0x00da, 0x00db, 0x00d9,
0x00fd, 0x00dd, 0x00af, 0x00b4, 0x00ad, 0x00b1,
0x2017, 0x00be, 0x00b6, 0x00a7, 0x00f7, 0x00b8,
0x00b0, 0x00a8, 0x00b7, 0x00b9, 0x00b3, 0x00b2,
0x25a0, 0x00a0};
final SimpleEncodingHolder cp850 = new SimpleEncodingHolder(cp850_high_chars);
se.put("CP850", cp850);
se.put("Cp850", cp850);
se.put("cp850", cp850);
se.put("IBM850", cp850);
se.put("ibm850", cp850);
simpleEncodings = Collections.unmodifiableMap(se);
}
/**
* Grow a byte buffer, so it has a minimal capacity or at least
* the double capacity of the original buffer
*
* @param b The original buffer.
* @param newCapacity The minimal requested new capacity.
* @return A byte buffer r with
* r.capacity() = max(b.capacity() * 2,newCapacity) and
* all the data contained in b copied to the beginning
* of r.
*
*/
static ByteBuffer growBuffer(final ByteBuffer b, final int newCapacity) {
b.limit(b.position());
b.rewind();
final int c2 = b.capacity() * 2;
final ByteBuffer on = ByteBuffer.allocate(c2 < newCapacity ? newCapacity : c2);
on.put(b);
return on;
}
/**
* The hexadecimal digits 0,...,9,A,...,F encoded as
* ASCII bytes.
*/
private static final byte[] HEX_DIGITS = new byte[] {
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x41,
0x42, 0x43, 0x44, 0x45, 0x46
};
/**
* Append %Uxxxx to the given byte buffer.
* The caller must assure, that bb.remaining()>=6.
*
* @param bb The byte buffer to write to.
* @param c The character to write.
*/
static void appendSurrogate(final ByteBuffer bb, final char c) {
bb.put((byte) '%');
bb.put((byte) 'U');
bb.put(HEX_DIGITS[(c >> 12) & 0x0f]);
bb.put(HEX_DIGITS[(c >> 8) & 0x0f]);
bb.put(HEX_DIGITS[(c >> 4) & 0x0f]);
bb.put(HEX_DIGITS[c & 0x0f]);
}
/**
* name of the encoding UTF-8
*/
static final String UTF8 = "UTF8";
/**
* variant name of the encoding UTF-8 used for comparisons.
*/
private static final String UTF_DASH_8 = "utf-8";
/**
* name of the encoding UTF-8
*/
static final ZipEncoding UTF8_ZIP_ENCODING = new FallbackZipEncoding(UTF8);
/**
* Instantiates a zip encoding.
*
* @param name The name of the zip encoding. Specify {@code null} for
* the platform's default encoding.
* @return A zip encoding for the given encoding name.
*/
public static ZipEncoding getZipEncoding(final String name) {
// fallback encoding is good enough for utf-8.
if (isUTF8(name)) {
return UTF8_ZIP_ENCODING;
}
if (name == null) {
return new FallbackZipEncoding();
}
final SimpleEncodingHolder h = simpleEncodings.get(name);
if (h != null) {
return h.getEncoding();
}
try {
final Charset cs = Charset.forName(name);
return new NioZipEncoding(cs);
} catch (final UnsupportedCharsetException e) {
return new FallbackZipEncoding(name);
}
}
/**
* Whether a given encoding - or the platform's default encoding
* if the parameter is null - is UTF-8.
*/
static boolean isUTF8(String encoding) {
if (encoding == null) {
// check platform's default encoding
encoding = System.getProperty("file.encoding");
}
return UTF8.equalsIgnoreCase(encoding)
|| UTF_DASH_8.equalsIgnoreCase(encoding);
}
}
