| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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 |
| } |
| } |