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| package org.apache.geronimo.mail.util; |
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| import java.io.IOException; |
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| import java.io.OutputStream; |
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| |
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| public class HexEncoder |
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| implements Encoder |
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| { |
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| protected final byte[] encodingTable = |
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| { |
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| (byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7', |
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| (byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f' |
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| }; |
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| protected final byte[] decodingTable = new byte[128]; |
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| |
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0
| protected void initialiseDecodingTable()
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| { |
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0
| for (int i = 0; i < encodingTable.length; i++)
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| { |
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0
| decodingTable[encodingTable[i]] = (byte)i;
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| } |
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| |
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0
| decodingTable['A'] = decodingTable['a'];
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0
| decodingTable['B'] = decodingTable['b'];
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0
| decodingTable['C'] = decodingTable['c'];
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0
| decodingTable['D'] = decodingTable['d'];
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0
| decodingTable['E'] = decodingTable['e'];
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0
| decodingTable['F'] = decodingTable['f'];
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| } |
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| |
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0
| public HexEncoder()
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| { |
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0
| initialiseDecodingTable();
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| } |
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0
| public int encode(
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| byte[] data, |
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| int off, |
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| int length, |
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| OutputStream out) |
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| throws IOException |
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| { |
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0
| for (int i = off; i < (off + length); i++)
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| { |
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0
| int v = data[i] & 0xff;
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| |
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0
| out.write(encodingTable[(v >>> 4)]);
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0
| out.write(encodingTable[v & 0xf]);
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| } |
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| |
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0
| return length * 2;
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| } |
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| |
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0
| private boolean ignore(
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| char c) |
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| { |
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0
| return (c == '\n' || c =='\r' || c == '\t' || c == ' ');
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| } |
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0
| public int decode(
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| byte[] data, |
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| int off, |
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| int length, |
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| OutputStream out) |
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| throws IOException |
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| { |
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0
| byte[] bytes;
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0
| byte b1, b2;
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0
| int outLen = 0;
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| |
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0
| int end = off + length;
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| |
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0
| while (end > 0)
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| { |
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0
| if (!ignore((char)data[end - 1]))
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| { |
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0
| break;
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| } |
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| |
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0
| end--;
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| } |
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| |
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0
| int i = off;
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0
| while (i < end)
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| { |
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0
| while (i < end && ignore((char)data[i]))
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| { |
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0
| i++;
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| } |
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| |
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0
| b1 = decodingTable[data[i++]];
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| |
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0
| while (i < end && ignore((char)data[i]))
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| { |
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0
| i++;
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| } |
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| |
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0
| b2 = decodingTable[data[i++]];
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| |
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0
| out.write((b1 << 4) | b2);
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| |
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0
| outLen++;
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| } |
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| |
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0
| return outLen;
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| } |
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0
| public int decode(
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| String data, |
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| OutputStream out) |
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| throws IOException |
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| { |
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0
| byte[] bytes;
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0
| byte b1, b2, b3, b4;
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0
| int length = 0;
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| |
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0
| int end = data.length();
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| |
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0
| while (end > 0)
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| { |
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0
| if (!ignore(data.charAt(end - 1)))
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| { |
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0
| break;
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| } |
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0
| end--;
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| } |
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| |
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0
| int i = 0;
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0
| while (i < end)
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| { |
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0
| while (i < end && ignore(data.charAt(i)))
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| { |
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0
| i++;
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| } |
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| |
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0
| b1 = decodingTable[data.charAt(i++)];
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| |
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0
| while (i < end && ignore(data.charAt(i)))
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| { |
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0
| i++;
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| } |
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| |
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0
| b2 = decodingTable[data.charAt(i++)];
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0
| out.write((b1 << 4) | b2);
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0
| length++;
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| } |
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0
| return length;
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| } |
|
191 |
| } |