1 /* 2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang; 27 28 import java.io.DataInputStream; 29 import java.io.InputStream; 30 import java.lang.ref.SoftReference; 31 import java.util.Arrays; 32 import java.util.zip.InflaterInputStream; 33 import java.security.AccessController; 34 import java.security.PrivilegedAction; 35 36 class CharacterName { 37 38 private static SoftReference<byte[]> refStrPool; 39 private static int[][] lookup; 40 41 private static synchronized byte[] initNamePool() { 42 byte[] strPool = null; 43 if (refStrPool != null && (strPool = refStrPool.get()) != null) 44 return strPool; 45 DataInputStream dis = null; 46 try { 47 dis = new DataInputStream(new InflaterInputStream( 48 AccessController.doPrivileged(new PrivilegedAction<InputStream>() 49 { 50 public InputStream run() { 51 return getClass().getResourceAsStream("uniName.dat"); 52 } 53 }))); 54 55 lookup = new int[(Character.MAX_CODE_POINT + 1) >> 8][]; 56 int total = dis.readInt(); 57 int cpEnd = dis.readInt(); 58 byte ba[] = new byte[cpEnd]; 59 dis.readFully(ba); 60 61 int nameOff = 0; 62 int cpOff = 0; 63 int cp = 0; 64 do { 65 int len = ba[cpOff++] & 0xff; 66 if (len == 0) { 67 len = ba[cpOff++] & 0xff; 68 // always big-endian 69 cp = ((ba[cpOff++] & 0xff) << 16) | 70 ((ba[cpOff++] & 0xff) << 8) | 71 ((ba[cpOff++] & 0xff)); 72 } else { 73 cp++; 74 } 75 int hi = cp >> 8; 76 if (lookup[hi] == null) { 77 lookup[hi] = new int[0x100]; 78 } 79 lookup[hi][cp&0xff] = (nameOff << 8) | len; 80 nameOff += len; 81 } while (cpOff < cpEnd); 82 strPool = new byte[total - cpEnd]; 83 dis.readFully(strPool); 84 refStrPool = new SoftReference<byte[]>(strPool); 85 } catch (Exception x) { 86 throw new InternalError(x.getMessage()); 87 } finally { 88 try { 89 if (dis != null) 90 dis.close(); 91 } catch (Exception xx) {} 92 } 93 return strPool; 94 } 95 96 public static String get(int cp) { 97 byte[] strPool = null; 98 if (refStrPool == null || (strPool = refStrPool.get()) == null) 99 strPool = initNamePool(); 100 int off = 0; 101 if (lookup[cp>>8] == null || 102 (off = lookup[cp>>8][cp&0xff]) == 0) 103 return null; 104 return new String(strPool, 0, off >>> 8, off & 0xff); // ASCII 105 } 106 }