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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 android.support.v7.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>();
    126         assert(MIBENUM_NUMBERS.length == MIME_NAMES.length);
    127         int count = MIBENUM_NUMBERS.length - 1;
    128         for(int i = 0; i <= count; i++) {
    129             MIBENUM_TO_NAME_MAP.put(MIBENUM_NUMBERS[i], MIME_NAMES[i]);
    130             NAME_TO_MIBENUM_MAP.put(MIME_NAMES[i], MIBENUM_NUMBERS[i]);
    131         }
    132     }
    133 
    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      */
    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      */
    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