source: contrib/MailArchiver/sources/vendor/mime4j/custom/core/src/test/java/org/apache/james/mime4j/EncodeUtils.java @ 6785

Revision 6785, 5.2 KB checked in by rafaelraymundo, 12 years ago (diff)

Ticket #2946 - Liberado codigo do MailArchiver?. Documentação na subpasta DOCS.
Line 
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19
20package org.apache.james.mime4j;
21
22
23public class EncodeUtils {
24   
25    public static final int MASK = 0x3F;
26    public static final int FIRST_MASK = MASK << 18;
27    public static final int SECOND_MASK = MASK << 12;
28    public static final int THIRD_MASK = MASK << 6;
29    public static final int FORTH_MASK = MASK;
30   
31    public static final byte[] ENCODING = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
32        'O', 'P' ,'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
33        'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
34        '4', '5', '6', '7', '8', '9', '+', '/'};
35   
36    public static final void main(String[] args) throws Exception {
37        byte[] bytes = {(byte) 0, (byte) 128, (byte) 0};
38        System.out.println(new String(toBase64(bytes)));
39        System.out.println(new String(toBase64("Hello, World".getBytes())));
40        System.out.println(new String(toBase64("Monday".getBytes())));
41        System.out.println(new String(toBase64("M\u00F6nchengladbach\r\n".getBytes("ISO-8859-1"))));
42    }
43   
44    public static byte[] toBase64(byte[] in) {
45        int inputLength = in.length;
46        int outputLength = (int) Math.floor((4*inputLength) / 3f) + 3;
47        outputLength = outputLength + 2 * (int) Math.floor(outputLength / 76f);
48        byte[] results = new byte[outputLength];
49        int inputIndex = 0;
50        int outputIndex = 0;
51        while (inputLength - inputIndex > 2) {
52            int one = (toInt(in[inputIndex++]) << 16);
53            int two = (toInt(in[inputIndex++]) << 8);
54            int three = toInt(in[inputIndex++]);
55            int quantum = one | two | three;
56            int index = (quantum & FIRST_MASK) >> 18;
57            outputIndex = setResult(results, outputIndex, ENCODING[index]);
58            index = (quantum & SECOND_MASK) >> 12;
59            outputIndex = setResult(results, outputIndex, ENCODING[index]);
60            index = (quantum & THIRD_MASK) >> 6;
61            outputIndex = setResult(results, outputIndex, ENCODING[index]);
62            index = (quantum & FORTH_MASK);
63            outputIndex = setResult(results, outputIndex, ENCODING[index]);
64        }
65       
66        switch (inputLength - inputIndex) {
67            case 1:
68                int quantum = in[inputIndex++] << 16;
69                int index = (quantum & FIRST_MASK) >> 18;
70                outputIndex = setResult(results, outputIndex, ENCODING[index]);
71                index = (quantum & SECOND_MASK) >> 12;
72                outputIndex = setResult(results, outputIndex, ENCODING[index]);
73                outputIndex = setResult(results, outputIndex, (byte) '=');
74                outputIndex = setResult(results, outputIndex, (byte) '=');
75                break;
76               
77            case 2:
78                quantum = (in[inputIndex++] << 16) + (in[inputIndex++] << 8);
79                index = (quantum & FIRST_MASK) >> 18;
80                outputIndex = setResult(results, outputIndex, ENCODING[index]);
81                index = (quantum & SECOND_MASK) >> 12;
82                outputIndex = setResult(results, outputIndex, ENCODING[index]);
83                index = (quantum & THIRD_MASK) >> 6;
84                outputIndex = setResult(results, outputIndex, ENCODING[index]);
85                outputIndex = setResult(results, outputIndex, (byte) '=');
86                break;
87        }
88       
89        return results;
90    }
91
92    private static int toInt(byte b) {
93        return 255 & b;
94    }
95
96
97    private static int setResult(byte[] results, int outputIndex, byte value) {
98        results[outputIndex++] = value;
99        outputIndex = checkLineLength(results, outputIndex);
100        return outputIndex;
101    }
102
103
104    private static int checkLineLength(byte[] results, int outputIndex) {
105        if (outputIndex == 76 || outputIndex > 76 && (outputIndex - 2*Math.floor(outputIndex/76f - 1)) % 76 == 0) {
106            results[outputIndex++] = '\r';
107            results[outputIndex++] = '\n';
108        }
109        return outputIndex;
110    }
111}
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