Mega Code Archive
A method to decodeencode quoted printable encoded data
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/*
* Funambol is a mobile platform developed by Funambol, Inc.
* Copyright (C) 2003 - 2007 Funambol, Inc.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU Affero General Public License version 3 as published by
* the Free Software Foundation with the addition of the following permission
* added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
* WORK IN WHICH THE COPYRIGHT IS OWNED BY FUNAMBOL, FUNAMBOL DISCLAIMS THE
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*
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* details.
*
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* MA 02110-1301 USA.
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* 305, Redwood City, CA 94063, USA, or at email address info@funambol.com.
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* Section 5 of the GNU Affero General Public License version 3.
*
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*/
//package com.funambol.util;
import java.io.UnsupportedEncodingException;
/**
* A class containing static methods to perform decoding from <b>quoted
* printable</b> content transfer encoding and to encode into
*/
public class QuotedPrintable {
private static byte HT = 0x09; // \t
private static byte LF = 0x0A; // \n
private static byte CR = 0x0D; // \r
/**
* A method to decode quoted printable encoded data. It overrides the same
* input byte array to save memory. Can be done because the result is surely
* smaller than the input.
*
* @param qp
* a byte array to decode.
* @return the length of the decoded array.
*/
public static int decode(final byte[] qp) {
final int qplen = qp.length;
int retlen = 0;
for (int i = 0; i < qplen; i++) {
// Handle encoded chars
if (qp[i] == '=')
if (qplen - i > 2)
// The sequence can be complete, check it
if (qp[i + 1] == QuotedPrintable.CR
&& qp[i + 2] == QuotedPrintable.LF) {
// soft line break, ignore it
i += 2;
continue;
} else if (QuotedPrintable.isHexDigit(qp[i + 1])
&& QuotedPrintable.isHexDigit(qp[i + 2])) {
// convert the number into an integer, taking
// the ascii digits stored in the array.
qp[retlen++] = (byte) (QuotedPrintable
.getHexValue(qp[i + 1]) * 16 + QuotedPrintable
.getHexValue(qp[i + 2]));
i += 2;
continue;
} else
// Log.error("decode: Invalid sequence = " + qp[i + 1]
// + qp[i + 2]);
// RFC 2045 says to exclude control characters mistakenly
// present (unencoded) in the encoded stream.
// As an exception, we keep unencoded tabs (0x09)
if ((qp[i] >= 0x20 && qp[i] <= 0x7f) || qp[i] == QuotedPrintable.HT
|| qp[i] == QuotedPrintable.CR
|| qp[i] == QuotedPrintable.LF)
qp[retlen++] = qp[i];
}
return retlen;
}
private static boolean isHexDigit(final byte b) {
return ((b >= 0x30 && b <= 0x39) || (b >= 0x41 && b <= 0x46));
}
private static byte getHexValue(final byte b) {
return (byte) Character.digit((char) b, 16);
}
/**
*
* @param qp
* Byte array to decode
* @param enc
* The character encoding of the decoded string
* @return The decoded string.
*/
public static String decode(final byte[] qp, final String enc) {
final int len = QuotedPrintable.decode(qp);
try {
return new String(qp, 0, len, enc);
} catch (final UnsupportedEncodingException e) {
// Log.error("qp.decode: " + enc + " not supported. " + e.toString());
return new String(qp, 0, len);
}
}
/**
* A method to encode data in quoted printable
*
* @param content
* The string to be encoded
* @return the encoded string.
* @throws Exception
*
* public static byte[] encode(String content, String enc)
* throws Exception { // TODO: to be implemented (has to return
* a String) throw new
* Exception("This method is not implemented!"); }
*/
/**
* A method to encode data in quoted printable
*
* @param content
* The string to be encoded
* @return the encoded string.
* @throws Exception
*
* public static byte[] encode(byte[] content) throws Exception
* { // TODO: to be implemented (has to return a String) throw
* new Exception("This method is not implemented!"); }
*/
}
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