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1 /*
2  * Copyright (C) 2007 Esmertec AG.
3  * Copyright (C) 2007 The Android Open Source Project
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 package com.google.android.mms.pdu;
19 
20 import java.io.UnsupportedEncodingException;
21 import java.util.HashMap;
22 
23 public class CharacterSets {
24     /**
25      * IANA assigned MIB enum numbers.
26      *
27      * From wap-230-wsp-20010705-a.pdf
28      * Any-charset = <Octet 128>
29      * Equivalent to the special RFC2616 charset value "*"
30      */
31     public static final int ANY_CHARSET = 0x00;
32     public static final int US_ASCII    = 0x03;
33     public static final int ISO_8859_1  = 0x04;
34     public static final int ISO_8859_2  = 0x05;
35     public static final int ISO_8859_3  = 0x06;
36     public static final int ISO_8859_4  = 0x07;
37     public static final int ISO_8859_5  = 0x08;
38     public static final int ISO_8859_6  = 0x09;
39     public static final int ISO_8859_7  = 0x0A;
40     public static final int ISO_8859_8  = 0x0B;
41     public static final int ISO_8859_9  = 0x0C;
42     public static final int SHIFT_JIS   = 0x11;
43     public static final int UTF_8       = 0x6A;
44     public static final int BIG5        = 0x07EA;
45     public static final int UCS2        = 0x03E8;
46     public static final int UTF_16      = 0x03F7;
47 
48     /**
49      * If the encoding of given data is unsupported, use UTF_8 to decode it.
50      */
51     public static final int DEFAULT_CHARSET = UTF_8;
52 
53     /**
54      * Array of MIB enum numbers.
55      */
56     private static final int[] MIBENUM_NUMBERS = {
57         ANY_CHARSET,
58         US_ASCII,
59         ISO_8859_1,
60         ISO_8859_2,
61         ISO_8859_3,
62         ISO_8859_4,
63         ISO_8859_5,
64         ISO_8859_6,
65         ISO_8859_7,
66         ISO_8859_8,
67         ISO_8859_9,
68         SHIFT_JIS,
69         UTF_8,
70         BIG5,
71         UCS2,
72         UTF_16,
73     };
74 
75     /**
76      * The Well-known-charset Mime name.
77      */
78     public static final String MIMENAME_ANY_CHARSET = "*";
79     public static final String MIMENAME_US_ASCII    = "us-ascii";
80     public static final String MIMENAME_ISO_8859_1  = "iso-8859-1";
81     public static final String MIMENAME_ISO_8859_2  = "iso-8859-2";
82     public static final String MIMENAME_ISO_8859_3  = "iso-8859-3";
83     public static final String MIMENAME_ISO_8859_4  = "iso-8859-4";
84     public static final String MIMENAME_ISO_8859_5  = "iso-8859-5";
85     public static final String MIMENAME_ISO_8859_6  = "iso-8859-6";
86     public static final String MIMENAME_ISO_8859_7  = "iso-8859-7";
87     public static final String MIMENAME_ISO_8859_8  = "iso-8859-8";
88     public static final String MIMENAME_ISO_8859_9  = "iso-8859-9";
89     public static final String MIMENAME_SHIFT_JIS   = "shift_JIS";
90     public static final String MIMENAME_UTF_8       = "utf-8";
91     public static final String MIMENAME_BIG5        = "big5";
92     public static final String MIMENAME_UCS2        = "iso-10646-ucs-2";
93     public static final String MIMENAME_UTF_16      = "utf-16";
94 
95     public static final String DEFAULT_CHARSET_NAME = MIMENAME_UTF_8;
96 
97     /**
98      * Array of the names of character sets.
99      */
100     private static final String[] MIME_NAMES = {
101         MIMENAME_ANY_CHARSET,
102         MIMENAME_US_ASCII,
103         MIMENAME_ISO_8859_1,
104         MIMENAME_ISO_8859_2,
105         MIMENAME_ISO_8859_3,
106         MIMENAME_ISO_8859_4,
107         MIMENAME_ISO_8859_5,
108         MIMENAME_ISO_8859_6,
109         MIMENAME_ISO_8859_7,
110         MIMENAME_ISO_8859_8,
111         MIMENAME_ISO_8859_9,
112         MIMENAME_SHIFT_JIS,
113         MIMENAME_UTF_8,
114         MIMENAME_BIG5,
115         MIMENAME_UCS2,
116         MIMENAME_UTF_16,
117     };
118 
119     private static final HashMap<Integer, String> MIBENUM_TO_NAME_MAP;
120     private static final HashMap<String, Integer> NAME_TO_MIBENUM_MAP;
121 
122     static {
123         // Create the HashMaps.
124         MIBENUM_TO_NAME_MAP = new HashMap<Integer, String>();
125         NAME_TO_MIBENUM_MAP = new HashMap<String, Integer>();
assert(MIBENUM_NUMBERS.length == MIME_NAMES.length)126         assert(MIBENUM_NUMBERS.length == MIME_NAMES.length);
127         int count = MIBENUM_NUMBERS.length - 1;
128         for(int i = 0; i <= count; i++) {
MIBENUM_TO_NAME_MAP.put(MIBENUM_NUMBERS[i], MIME_NAMES[i])129             MIBENUM_TO_NAME_MAP.put(MIBENUM_NUMBERS[i], MIME_NAMES[i]);
NAME_TO_MIBENUM_MAP.put(MIME_NAMES[i], MIBENUM_NUMBERS[i])130             NAME_TO_MIBENUM_MAP.put(MIME_NAMES[i], MIBENUM_NUMBERS[i]);
131         }
132     }
133 
CharacterSets()134     private CharacterSets() {} // Non-instantiatable
135 
136     /**
137      * Map an MIBEnum number to the name of the charset which this number
138      * is assigned to by IANA.
139      *
140      * @param mibEnumValue An IANA assigned MIBEnum number.
141      * @return The name string of the charset.
142      * @throws UnsupportedEncodingException
143      */
getMimeName(int mibEnumValue)144     public static String getMimeName(int mibEnumValue)
145             throws UnsupportedEncodingException {
146         String name = MIBENUM_TO_NAME_MAP.get(mibEnumValue);
147         if (name == null) {
148             throw new UnsupportedEncodingException();
149         }
150         return name;
151     }
152 
153     /**
154      * Map a well-known charset name to its assigned MIBEnum number.
155      *
156      * @param mimeName The charset name.
157      * @return The MIBEnum number assigned by IANA for this charset.
158      * @throws UnsupportedEncodingException
159      */
getMibEnumValue(String mimeName)160     public static int getMibEnumValue(String mimeName)
161             throws UnsupportedEncodingException {
162         if(null == mimeName) {
163             return -1;
164         }
165 
166         Integer mibEnumValue = NAME_TO_MIBENUM_MAP.get(mimeName);
167         if (mibEnumValue == null) {
168             throw new UnsupportedEncodingException();
169         }
170         return mibEnumValue;
171     }
172 }
173