/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package java.lang;
import java.io.DataInputStream;
import java.io.InputStream;
import java.lang.ref.SoftReference;
import java.util.Arrays;
import java.util.zip.InflaterInputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
class CharacterName {
private static SoftReference<byte[]> refStrPool;
private static int[][] lookup;
private static synchronized byte[] initNamePool() {
byte[] strPool = null;
if (refStrPool != null && (strPool = refStrPool.get()) != null)
return strPool;
DataInputStream dis = null;
try {
dis = new DataInputStream(new InflaterInputStream(
AccessController.doPrivileged(new PrivilegedAction<InputStream>()
{
public InputStream run() {
return getClass().getResourceAsStream("uniName.dat");
}
})));
lookup = new int[(Character.MAX_CODE_POINT + 1) >> 8][];
int total = dis.readInt();
int cpEnd = dis.readInt();
byte ba[] = new byte[cpEnd];
dis.readFully(ba);
int nameOff = 0;
int cpOff = 0;
int cp = 0;
do {
int len = ba[cpOff++] & 0xff;
if (len == 0) {
len = ba[cpOff++] & 0xff;
// always big-endian
cp = ((ba[cpOff++] & 0xff) << 16) |
((ba[cpOff++] & 0xff) << 8) |
((ba[cpOff++] & 0xff));
} else {
cp++;
}
int hi = cp >> 8;
if (lookup[hi] == null) {
lookup[hi] = new int[0x100];
}
lookup[hi][cp&0xff] = (nameOff << 8) | len;
nameOff += len;
} while (cpOff < cpEnd);
strPool = new byte[total - cpEnd];
dis.readFully(strPool);
refStrPool = new SoftReference<>(strPool);
} catch (Exception x) {
throw new InternalError(x.getMessage());
} finally {
try {
if (dis != null)
dis.close();
} catch (Exception xx) {}
}
return strPool;
}
public static String get(int cp) {
byte[] strPool = null;
if (refStrPool == null || (strPool = refStrPool.get()) == null)
strPool = initNamePool();
int off = 0;
if (lookup[cp>>8] == null ||
(off = lookup[cp>>8][cp&0xff]) == 0)
return null;
return new String(strPool, 0, off >>> 8, off & 0xff); // ASCII
}
}