CharacterName.java revision 3323
0N/A/*
2362N/A * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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0N/A * This code is free software; you can redistribute it and/or modify it
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
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0N/A */
0N/A
0N/Apackage java.lang;
0N/A
0N/Aimport java.io.DataInputStream;
0N/Aimport java.io.InputStream;
0N/Aimport java.lang.ref.SoftReference;
0N/Aimport java.util.Arrays;
0N/Aimport java.util.zip.InflaterInputStream;
0N/Aimport java.security.AccessController;
0N/Aimport java.security.PrivilegedAction;
0N/A
0N/Aclass CharacterName {
0N/A
0N/A private static SoftReference<byte[]> refStrPool;
0N/A private static int[][] lookup;
0N/A
0N/A private static synchronized byte[] initNamePool() {
0N/A byte[] strPool = null;
0N/A if (refStrPool != null && (strPool = refStrPool.get()) != null)
0N/A return strPool;
0N/A DataInputStream dis = null;
0N/A try {
0N/A dis = new DataInputStream(new InflaterInputStream(
0N/A 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
}
}