aoqi@0: /*
aoqi@0: * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0: *
aoqi@0: * This code is free software; you can redistribute it and/or modify it
aoqi@0: * under the terms of the GNU General Public License version 2 only, as
aoqi@0: * published by the Free Software Foundation. Oracle designates this
aoqi@0: * particular file as subject to the "Classpath" exception as provided
aoqi@0: * by Oracle in the LICENSE file that accompanied this code.
aoqi@0: *
aoqi@0: * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0: * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0: * accompanied this code).
aoqi@0: *
aoqi@0: * You should have received a copy of the GNU General Public License version
aoqi@0: * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0: *
aoqi@0: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0: * or visit www.oracle.com if you need additional information or have any
aoqi@0: * questions.
aoqi@0: */
aoqi@0:
aoqi@0: /* FROM mail.jar */
aoqi@0: package com.sun.xml.internal.org.jvnet.mimepull;
aoqi@0:
aoqi@0: final class ASCIIUtility {
aoqi@0:
aoqi@0: // Private constructor so that this class is not instantiated
aoqi@0: private ASCIIUtility() { }
aoqi@0:
aoqi@0: /**
aoqi@0: * Convert the bytes within the specified range of the given byte
aoqi@0: * array into a signed integer in the given radix . The range extends
aoqi@0: * from start
till, but not including end
.
aoqi@0: *
aoqi@0: * Based on java.lang.Integer.parseInt()
aoqi@0: */
aoqi@0: public static int parseInt(byte[] b, int start, int end, int radix)
aoqi@0: throws NumberFormatException {
aoqi@0: if (b == null) {
aoqi@0: throw new NumberFormatException("null");
aoqi@0: }
aoqi@0:
aoqi@0: int result = 0;
aoqi@0: boolean negative = false;
aoqi@0: int i = start;
aoqi@0: int limit;
aoqi@0: int multmin;
aoqi@0: int digit;
aoqi@0:
aoqi@0: if (end > start) {
aoqi@0: if (b[i] == '-') {
aoqi@0: negative = true;
aoqi@0: limit = Integer.MIN_VALUE;
aoqi@0: i++;
aoqi@0: } else {
aoqi@0: limit = -Integer.MAX_VALUE;
aoqi@0: }
aoqi@0: multmin = limit / radix;
aoqi@0: if (i < end) {
aoqi@0: digit = Character.digit((char)b[i++], radix);
aoqi@0: if (digit < 0) {
aoqi@0: throw new NumberFormatException(
aoqi@0: "illegal number: " + toString(b, start, end)
aoqi@0: );
aoqi@0: } else {
aoqi@0: result = -digit;
aoqi@0: }
aoqi@0: }
aoqi@0: while (i < end) {
aoqi@0: // Accumulating negatively avoids surprises near MAX_VALUE
aoqi@0: digit = Character.digit((char)b[i++], radix);
aoqi@0: if (digit < 0) {
aoqi@0: throw new NumberFormatException("illegal number");
aoqi@0: }
aoqi@0: if (result < multmin) {
aoqi@0: throw new NumberFormatException("illegal number");
aoqi@0: }
aoqi@0: result *= radix;
aoqi@0: if (result < limit + digit) {
aoqi@0: throw new NumberFormatException("illegal number");
aoqi@0: }
aoqi@0: result -= digit;
aoqi@0: }
aoqi@0: } else {
aoqi@0: throw new NumberFormatException("illegal number");
aoqi@0: }
aoqi@0: if (negative) {
aoqi@0: if (i > start + 1) {
aoqi@0: return result;
aoqi@0: } else { /* Only got "-" */
aoqi@0: throw new NumberFormatException("illegal number");
aoqi@0: }
aoqi@0: } else {
aoqi@0: return -result;
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: /**
aoqi@0: * Convert the bytes within the specified range of the given byte
aoqi@0: * array into a String. The range extends from start
aoqi@0: * till, but not including end
.
aoqi@0: */ aoqi@0: public static String toString(byte[] b, int start, int end) { aoqi@0: int size = end - start; aoqi@0: char[] theChars = new char[size]; aoqi@0: aoqi@0: for (int i = 0, j = start; i < size; ) { aoqi@0: theChars[i++] = (char)(b[j++]&0xff); aoqi@0: } aoqi@0: aoqi@0: return new String(theChars); aoqi@0: } aoqi@0: aoqi@0: }