1 /* 2 * Copyright (c) 2001, 2011, 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 sun.reflect; 27 28 /** It is necessary to use a "bootstrap" UTF-8 encoder for encoding 29 constant pool entries because the character set converters rely on 30 Class.newInstance(). */ 31 32 class UTF8 { 33 // This encoder is not quite correct. It does not handle surrogate pairs. encode(String str)34 static byte[] encode(String str) { 35 int len = str.length(); 36 byte[] res = new byte[utf8Length(str)]; 37 int utf8Idx = 0; 38 try { 39 for (int i = 0; i < len; i++) { 40 int c = str.charAt(i) & 0xFFFF; 41 if (c >= 0x0001 && c <= 0x007F) { 42 res[utf8Idx++] = (byte) c; 43 } else if (c == 0x0000 || 44 (c >= 0x0080 && c <= 0x07FF)) { 45 res[utf8Idx++] = (byte) (0xC0 + (c >> 6)); 46 res[utf8Idx++] = (byte) (0x80 + (c & 0x3F)); 47 } else { 48 res[utf8Idx++] = (byte) (0xE0 + (c >> 12)); 49 res[utf8Idx++] = (byte) (0x80 + ((c >> 6) & 0x3F)); 50 res[utf8Idx++] = (byte) (0x80 + (c & 0x3F)); 51 } 52 } 53 } catch (ArrayIndexOutOfBoundsException e) { 54 throw new InternalError 55 ("Bug in sun.reflect bootstrap UTF-8 encoder", e); 56 } 57 return res; 58 } 59 utf8Length(String str)60 private static int utf8Length(String str) { 61 int len = str.length(); 62 int utf8Len = 0; 63 for (int i = 0; i < len; i++) { 64 int c = str.charAt(i) & 0xFFFF; 65 if (c >= 0x0001 && c <= 0x007F) { 66 utf8Len += 1; 67 } else if (c == 0x0000 || 68 (c >= 0x0080 && c <= 0x07FF)) { 69 utf8Len += 2; 70 } else { 71 utf8Len += 3; 72 } 73 } 74 return utf8Len; 75 } 76 } 77