1/*
2 * Copyright (c) 1997, 2017, 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/*
27 * @(#)ASCIIUtility.java      1.9 02/03/27
28 */
29
30
31package com.sun.xml.internal.messaging.saaj.packaging.mime.util;
32
33import com.sun.xml.internal.messaging.saaj.util.ByteOutputStream;
34
35import java.io.IOException;
36import java.io.InputStream;
37
38public class ASCIIUtility {
39
40    // Private constructor so that this class is not instantiated
41    private ASCIIUtility() {
42    }
43
44
45    /**
46     * Convert the bytes within the specified range of the given byte
47     * array into a signed integer in the given radix . The range extends
48     * from <code>start</code> till, but not including <code>end</code>.
49     *
50     * Based on java.lang.Integer.parseInt().
51     *
52     * @param b     bytes to convert to integer.
53     * @param start start of the range.
54     * @param end   end of the range (not including).
55     * @param radix radix.
56     * @return integer.
57     */
58    public static int parseInt(byte[] b, int start, int end, int radix)
59            throws NumberFormatException {
60        if (b == null)
61            throw new NumberFormatException("null");
62
63        int result = 0;
64        boolean negative = false;
65        int i = start;
66        int limit;
67        int multmin;
68        int digit;
69
70        if (end > start) {
71            if (b[i] == '-') {
72                negative = true;
73                limit = Integer.MIN_VALUE;
74                i++;
75            } else {
76                limit = -Integer.MAX_VALUE;
77            }
78            multmin = limit / radix;
79            if (i < end) {
80                digit = Character.digit((char) b[i++], radix);
81                if (digit < 0) {
82                    throw new NumberFormatException(
83                            "illegal number: " + toString(b, start, end)
84                    );
85                } else {
86                    result = -digit;
87                }
88            }
89            while (i < end) {
90                // Accumulating negatively avoids surprises near MAX_VALUE
91                digit = Character.digit((char) b[i++], radix);
92                if (digit < 0) {
93                    throw new NumberFormatException("illegal number");
94                }
95                if (result < multmin) {
96                    throw new NumberFormatException("illegal number");
97                }
98                result *= radix;
99                if (result < limit + digit) {
100                    throw new NumberFormatException("illegal number");
101                }
102                result -= digit;
103            }
104        } else {
105            throw new NumberFormatException("illegal number");
106        }
107        if (negative) {
108            if (i > start + 1) {
109                return result;
110            } else {    /* Only got "-" */
111                throw new NumberFormatException("illegal number");
112            }
113        } else {
114            return -result;
115        }
116    }
117
118    /**
119     * Convert the bytes within the specified range of the given byte
120     * array into a String. The range extends from <code>start</code>
121     * till, but not including <code>end</code>.
122     *
123     * @param b     bytes to convert to integer.
124     * @param start start of the range.
125     * @param end   end of the range (not including).
126     * @return integer.
127     */
128    public static String toString(byte[] b, int start, int end) {
129        int size = end - start;
130        char[] theChars = new char[size];
131
132        for (int i = 0, j = start; i < size; )
133            theChars[i++] = (char) (b[j++] & 0xff);
134
135        return new String(theChars);
136    }
137
138    /**
139     * Encodes specified String into a sequence of bytes using the platform's
140     * default charset, storing the result into a new byte array.
141     *
142     * @param s string to encode into byte array.
143     * @return byte array.
144     */
145    public static byte[] getBytes(String s) {
146        char[] chars = s.toCharArray();
147        int size = chars.length;
148        byte[] bytes = new byte[size];
149
150        for (int i = 0; i < size; )
151            bytes[i] = (byte) chars[i++];
152        return bytes;
153    }
154
155    /**
156     * Converts input stream to array.
157     *
158     * @param is stream to convert to array.
159     * @return byte array.
160     * @throws IOException if an I/O error occurs.
161     * @deprecated this is an expensive operation that require an additional
162     * buffer reallocation just to get the array of an exact size.
163     * Unless you absolutely need the exact size array, don't use this.
164     * Use {@link ByteOutputStream} and {@link ByteOutputStream#write(InputStream)}.
165     */
166    @Deprecated
167    public static byte[] getBytes(InputStream is) throws IOException {
168        ByteOutputStream bos = null;
169        try {
170            bos = new ByteOutputStream();
171            bos.write(is);
172        } finally {
173            if (bos != null)
174                bos.close();
175            is.close();
176        }
177        return bos.toByteArray();
178    }
179}
180