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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.mail.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;

public 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() * * @param b the bytes * @param start the first byte offset * @param end the last byte offset * @param radix the radix * @return the integer value * @exception NumberFormatException for conversion errors */ 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 signed integer . The range extends from * start till, but not including end. * * @param b the bytes * @param start the first byte offset * @param end the last byte offset * @return the integer value * @exception NumberFormatException for conversion errors */ public static int parseInt(byte[] b, int start, int end) throws NumberFormatException { return parseInt(b, start, end, 10); } /** * Convert the bytes within the specified range of the given byte * array into a signed long in the given radix . The range extends * from start till, but not including end.

* * Based on java.lang.Long.parseLong() * * @param b the bytes * @param start the first byte offset * @param end the last byte offset * @param radix the radix * @return the long value * @exception NumberFormatException for conversion errors */ public static long parseLong(byte[] b, int start, int end, int radix) throws NumberFormatException { if (b == null) throw new NumberFormatException("null"); long result = 0; boolean negative = false; int i = start; long limit; long multmin; int digit; if (end > start) { if (b[i] == '-') { negative = true; limit = Long.MIN_VALUE; i++; } else { limit = -Long.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 signed long . The range extends from * start till, but not including end.

* * @param b the bytes * @param start the first byte offset * @param end the last byte offset * @return the long value * @exception NumberFormatException for conversion errors */ public static long parseLong(byte[] b, int start, int end) throws NumberFormatException { return parseLong(b, start, end, 10); } /** * 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. * * @param b the bytes * @param start the first byte offset * @param end the last byte offset * @return the String */ 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); } /** * Convert the bytes into a String. * * @param b the bytes * @return the String * @since JavaMail 1.4.4 */ public static String toString(byte[] b) { return toString(b, 0, b.length); } public static String toString(ByteArrayInputStream is) { int size = is.available(); char[] theChars = new char[size]; byte[] bytes = new byte[size]; is.read(bytes, 0, size); for (int i = 0; i < size;) theChars[i] = (char)(bytes[i++]&0xff); return new String(theChars); } public static byte[] getBytes(String s) { char [] chars= s.toCharArray(); int size = chars.length; byte[] bytes = new byte[size]; for (int i = 0; i < size;) bytes[i] = (byte) chars[i++]; return bytes; } public static byte[] getBytes(InputStream is) throws IOException { int len; int size = 1024; byte [] buf; if (is instanceof ByteArrayInputStream) { size = is.available(); buf = new byte[size]; len = is.read(buf, 0, size); } else { ByteArrayOutputStream bos = new ByteArrayOutputStream(); buf = new byte[size]; while ((len = is.read(buf, 0, size)) != -1) bos.write(buf, 0, len); buf = bos.toByteArray(); } return buf; } }





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