1/* 2 * Copyright (c) 1997, 2013, 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/* FROM mail.jar */ 27package com.sun.xml.internal.org.jvnet.mimepull; 28 29final class ASCIIUtility { 30 31 // Private constructor so that this class is not instantiated 32 private ASCIIUtility() { } 33 34 /** 35 * Convert the bytes within the specified range of the given byte 36 * array into a signed integer in the given radix . The range extends 37 * from <code>start</code> till, but not including <code>end</code>. <p> 38 * 39 * Based on java.lang.Integer.parseInt() 40 */ 41 public static int parseInt(byte[] b, int start, int end, int radix) 42 throws NumberFormatException { 43 if (b == null) { 44 throw new NumberFormatException("null"); 45 } 46 47 int result = 0; 48 boolean negative = false; 49 int i = start; 50 int limit; 51 int multmin; 52 int digit; 53 54 if (end > start) { 55 if (b[i] == '-') { 56 negative = true; 57 limit = Integer.MIN_VALUE; 58 i++; 59 } else { 60 limit = -Integer.MAX_VALUE; 61 } 62 multmin = limit / radix; 63 if (i < end) { 64 digit = Character.digit((char)b[i++], radix); 65 if (digit < 0) { 66 throw new NumberFormatException( 67 "illegal number: " + toString(b, start, end) 68 ); 69 } else { 70 result = -digit; 71 } 72 } 73 while (i < end) { 74 // Accumulating negatively avoids surprises near MAX_VALUE 75 digit = Character.digit((char)b[i++], radix); 76 if (digit < 0) { 77 throw new NumberFormatException("illegal number"); 78 } 79 if (result < multmin) { 80 throw new NumberFormatException("illegal number"); 81 } 82 result *= radix; 83 if (result < limit + digit) { 84 throw new NumberFormatException("illegal number"); 85 } 86 result -= digit; 87 } 88 } else { 89 throw new NumberFormatException("illegal number"); 90 } 91 if (negative) { 92 if (i > start + 1) { 93 return result; 94 } else { /* Only got "-" */ 95 throw new NumberFormatException("illegal number"); 96 } 97 } else { 98 return -result; 99 } 100 } 101 102 /** 103 * Convert the bytes within the specified range of the given byte 104 * array into a String. The range extends from <code>start</code> 105 * till, but not including <code>end</code>. <p> 106 */ 107 public static String toString(byte[] b, int start, int end) { 108 int size = end - start; 109 char[] theChars = new char[size]; 110 111 for (int i = 0, j = start; i < size; ) { 112 theChars[i++] = (char)(b[j++]&0xff); 113 } 114 115 return new String(theChars); 116 } 117 118} 119