/*
 * Copyright (c) 1997, 2013, 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.
 */

/* FROM mail.jar */
package com.sun.xml.internal.org.jvnet.mimepull;

final class ASCIIUtility {

    // Private constructor so that this class is not instantiated
    private ASCIIUtility() { }

    
Convert the bytes within the specified range of the given byte
array into a signed integer in the given radix . The range extends
from start till, but not including end. 

Based on java.lang.Integer.parseInt()
/**
     * Convert the bytes within the specified range of the given byte
     * array into a signed integer in the given radix . The range extends
     * from <code>start</code> till, but not including <code>end</code>. <p>
     *
     * Based on java.lang.Integer.parseInt()
     */
    public static int parseInt(byte[] b, int start, int end, int radix)
                throws NumberFormatException {
        if (b == null) {
            throw new NumberFormatException("null");
        }

        int result = 0;
        boolean negative = false;
        int i = start;
        int limit;
        int multmin;
        int digit;

        if (end > start) {
            if (b[i] == '-') {
                negative = true;
                limit = Integer.MIN_VALUE;
                i++;
            } else {
                limit = -Integer.MAX_VALUE;
            }
            multmin = limit / radix;
            if (i < end) {
                digit = Character.digit((char)b[i++], radix);
                if (digit < 0) {
                    throw new NumberFormatException(
                        "illegal number: " + toString(b, start, end)
                        );
                } else {
                    result = -digit;
                }
            }
            while (i < end) {
                // Accumulating negatively avoids surprises near MAX_VALUE
                digit = Character.digit((char)b[i++], radix);
                if (digit < 0) {
                    throw new NumberFormatException("illegal number");
                }
                if (result < multmin) {
                    throw new NumberFormatException("illegal number");
                }
                result *= radix;
                if (result < limit + digit) {
                    throw new NumberFormatException("illegal number");
                }
                result -= digit;
            }
        } else {
            throw new NumberFormatException("illegal number");
        }
        if (negative) {
            if (i > start + 1) {
                return result;
            } else {    /* Only got "-" */
                throw new NumberFormatException("illegal number");
            }
        } else {
            return -result;
        }
    }

    
Convert the bytes within the specified range of the given byte
array into a String. The range extends from start
till, but not including end. 

/**
     * Convert the bytes within the specified range of the given byte
     * array into a String. The range extends from <code>start</code>
     * till, but not including <code>end</code>. <p>
     */
    public static String toString(byte[] b, int start, int end) {
        int size = end - start;
        char[] theChars = new char[size];

        for (int i = 0, j = start; i < size; ) {
            theChars[i++] = (char)(b[j++]&0xff);
        }

        return new String(theChars);
    }

}