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com.ozacc.mail.fetch.impl.sk_jp.io.ByteToCharUTF7 |
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1 | /* |
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2 | * @(#) $Id: ByteToCharUTF7.java,v 1.1.2.1 2004/09/29 00:57:59 otsuka Exp $ |
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3 | * $Revision: 1.1.2.1 $ |
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4 | * Copyright (c) 2000 Shin Kinoshita All Rights Reserved. |
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5 | */ |
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6 | package com.ozacc.mail.fetch.impl.sk_jp.io; |
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7 | ||
8 | /** |
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9 | * UTF-7のデコーダです。 |
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10 | * <p> |
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11 | * </p> |
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12 | * @author Shin |
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13 | */ |
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14 | 0 | public class ByteToCharUTF7 extends sun.io.ByteToCharConverter { |
15 | public String getCharacterEncoding() { |
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16 | 0 | return "UTF7"; |
17 | } |
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18 | ||
19 | public int flush(char[] class="keyword">chars, class="keyword">int off, class="keyword">int len) { |
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20 | 0 | byteOff = 0; |
21 | 0 | charOff = 0; |
22 | 0 | b64Context = false; |
23 | 0 | currentB64Off = 0; |
24 | 0 | currentChar = 0; |
25 | 0 | return 0; |
26 | } |
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27 | public void reset() { |
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28 | 0 | byteOff = 0; |
29 | 0 | charOff = 0; |
30 | 0 | b64Context = false; |
31 | 0 | currentB64Off = 0; |
32 | 0 | currentChar = 0; |
33 | 0 | } |
34 | ||
35 | 0 | private boolean b64Context = false; |
36 | 0 | private int currentB64Off = 0; |
37 | 0 | private char currentChar = 0; |
38 | ||
39 | public int convert( |
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40 | byte[] bytes, |
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41 | int byteStart, |
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42 | int byteEnd, |
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43 | char[] class="keyword">chars, |
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44 | int charStart, |
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45 | int charEnd) |
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46 | throws |
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47 | sun.io.ConversionBufferFullException, |
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48 | sun.io.UnknownCharacterException { |
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49 | 0 | charOff = charStart; |
50 | ||
51 | 0 | for (byteOff = byteStart; byteOff < byteEnd; byteOff++) { |
52 | 0 | if (charOff >= charEnd) { |
53 | 0 | throw new sun.io.ConversionBufferFullException(); |
54 | } |
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55 | 0 | if (b64Context) { |
56 | 0 | if (bytes[byteOff] == '-') { |
57 | 0 | if (currentB64Off != 0 && currentChar > 0) { |
58 | 0 | chars[charOff] = currentChar; |
59 | 0 | charOff++; |
60 | } |
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61 | 0 | b64Context = false; |
62 | 0 | continue; |
63 | } |
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64 | 0 | int part = |
65 | 0 | ( |
66 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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67 | 0 | + "abcdefghijklmnopqrstuvwxyz0123456789+/").indexOf( |
68 | 0 | bytes[byteOff]); |
69 | 0 | if (part == -1) { |
70 | 0 | throw new sun.io.UnknownCharacterException( |
71 | 0 | "Invalid UTF-7 code: " + (char)bytes[byteOff]); |
72 | } |
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73 | ||
74 | 0 | switch (currentB64Off) { |
75 | case 0 : |
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76 | 0 | currentChar = (char) (part << 10); |
77 | 0 | break; |
78 | case 1 : |
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79 | 0 | currentChar |= (char) (part << 4); |
80 | 0 | break; |
81 | case 2 : |
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82 | 0 | currentChar |= (char) (part >> 2); |
83 | 0 | chars[charOff] = currentChar; |
84 | 0 | charOff++; |
85 | 0 | currentChar = (char) ((part & 0x03) << 14); |
86 | 0 | break; |
87 | case 3 : |
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88 | 0 | currentChar |= (char) (part << 8); |
89 | 0 | break; |
90 | case 4 : |
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91 | 0 | currentChar |= (char) (part << 2); |
92 | 0 | break; |
93 | case 5 : |
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94 | 0 | currentChar |= (char) (part >> 4); |
95 | 0 | chars[charOff] = currentChar; |
96 | 0 | charOff++; |
97 | 0 | currentChar = (char) ((part & 0x0f) << 12); |
98 | 0 | break; |
99 | case 6 : |
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100 | 0 | currentChar |= (char) (part << 6); |
101 | 0 | break; |
102 | case 7 : |
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103 | 0 | currentChar |= (char)part; |
104 | 0 | chars[charOff] = currentChar; |
105 | 0 | charOff++; |
106 | break; |
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107 | } |
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108 | 0 | currentB64Off = (currentB64Off + 1) % 8; |
109 | 0 | continue; |
110 | } |
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111 | ||
112 | 0 | if (bytes[byteOff] == '+') { |
113 | // shift character |
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114 | // This is start of the Base64 sequence. |
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115 | 0 | b64Context = true; |
116 | 0 | currentB64Off = 0; |
117 | 0 | continue; |
118 | } |
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119 | 0 | chars[charOff] = (char)bytes[byteOff]; |
120 | 0 | charOff++; |
121 | } |
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122 | 0 | return charOff - charStart; |
123 | } |
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124 | ||
125 | /* |
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126 | public static void main(String[] args) throws Exception { |
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127 | System.setProperty("file.encoding.pkg", "com.sk_jp.io"); |
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128 | ByteArrayOutputStream o = new ByteArrayOutputStream(); |
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129 | byte[] b = new byte[2048]; |
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130 | int len; |
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131 | while ((len = System.in.read(b)) != -1) { |
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132 | o.write(b, 0, len); |
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133 | } |
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134 | byte[] bytes = o.toByteArray(); |
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135 | |
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136 | System.out.println(new String(bytes, "UTF7")); |
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137 | } |
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138 | */ |
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139 | } |
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