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109 lines
2.9 KiB
109 lines
2.9 KiB
/*
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* Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*/
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package java.lang;
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import java.io.DataInputStream;
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import java.io.InputStream;
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import java.lang.ref.SoftReference;
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import java.util.Arrays;
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import java.util.zip.InflaterInputStream;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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class CharacterName {
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private static SoftReference<byte[]> refStrPool;
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private static int[][] lookup;
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private static synchronized byte[] initNamePool() {
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byte[] strPool = null;
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if (refStrPool != null && (strPool = refStrPool.get()) != null)
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return strPool;
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DataInputStream dis = null;
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try {
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dis = new DataInputStream(new InflaterInputStream(
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AccessController.doPrivileged(new PrivilegedAction<InputStream>()
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{
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public InputStream run() {
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return getClass().getResourceAsStream("uniName.dat");
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}
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})));
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lookup = new int[(Character.MAX_CODE_POINT + 1) >> 8][];
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int total = dis.readInt();
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int cpEnd = dis.readInt();
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byte ba[] = new byte[cpEnd];
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dis.readFully(ba);
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int nameOff = 0;
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int cpOff = 0;
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int cp = 0;
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do {
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int len = ba[cpOff++] & 0xff;
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if (len == 0) {
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len = ba[cpOff++] & 0xff;
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// always big-endian
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cp = ((ba[cpOff++] & 0xff) << 16) |
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((ba[cpOff++] & 0xff) << 8) |
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((ba[cpOff++] & 0xff));
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} else {
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cp++;
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}
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int hi = cp >> 8;
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if (lookup[hi] == null) {
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lookup[hi] = new int[0x100];
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}
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lookup[hi][cp&0xff] = (nameOff << 8) | len;
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nameOff += len;
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} while (cpOff < cpEnd);
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strPool = new byte[total - cpEnd];
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dis.readFully(strPool);
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refStrPool = new SoftReference<>(strPool);
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} catch (Exception x) {
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throw new InternalError(x.getMessage(), x);
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} finally {
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try {
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if (dis != null)
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dis.close();
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} catch (Exception xx) {}
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}
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return strPool;
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}
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public static String get(int cp) {
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byte[] strPool = null;
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if (refStrPool == null || (strPool = refStrPool.get()) == null)
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strPool = initNamePool();
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int off = 0;
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if (lookup[cp>>8] == null ||
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(off = lookup[cp>>8][cp&0xff]) == 0)
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return null;
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@SuppressWarnings("deprecation")
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String result = new String(strPool, 0, off >>> 8, off & 0xff); // ASCII
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return result;
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}
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}
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