Mega Code Archive
Convert a byte array to a URL encoded string
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/*
* Java Bittorrent API as its name indicates is a JAVA API that implements the Bittorrent Protocol
* This project contains two packages:
* 1. jBittorrentAPI is the "client" part, i.e. it implements all classes needed to publish
* files, share them and download them.
* This package also contains example classes on how a developer could create new applications.
* 2. trackerBT is the "tracker" part, i.e. it implements a all classes needed to run
* a Bittorrent tracker that coordinates peers exchanges. *
*
* Copyright (C) 2007 Baptiste Dubuis, Artificial Intelligence Laboratory, EPFL
*
* This file is part of jbittorrentapi-v1.0.zip
*
* Java Bittorrent API is free software and a free user study set-up;
* you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Java Bittorrent API is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Java Bittorrent API; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* @version 1.0
* @author Baptiste Dubuis
* To contact the author:
* email: baptiste.dubuis@gmail.com
*
* More information about Java Bittorrent API:
* http://sourceforge.net/projects/bitext/
*/
//package atorrentapi;
class Main {
/**
* Convert a byte array to a URL encoded string
*
* @param in
* byte[]
* @return String
*/
public static String byteArrayToURLString(byte in[]) {
byte ch = 0x00;
int i = 0;
if (in == null || in.length <= 0)
return null;
String pseudo[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"A", "B", "C", "D", "E", "F" };
StringBuffer out = new StringBuffer(in.length * 2);
while (i < in.length) {
// First check to see if we need ASCII or HEX
if ((in[i] >= '0' && in[i] <= '9')
|| (in[i] >= 'a' && in[i] <= 'z')
|| (in[i] >= 'A' && in[i] <= 'Z') || in[i] == '$'
|| in[i] == '-' || in[i] == '_' || in[i] == '.'
|| in[i] == '!') {
out.append((char) in[i]);
i++;
} else {
out.append('%');
ch = (byte) (in[i] & 0xF0); // Strip off high nibble
ch = (byte) (ch >>> 4); // shift the bits down
ch = (byte) (ch & 0x0F); // must do this is high order bit is
// on!
out.append(pseudo[(int) ch]); // convert the nibble to a
// String Character
ch = (byte) (in[i] & 0x0F); // Strip off low nibble
out.append(pseudo[(int) ch]); // convert the nibble to a
// String Character
i++;
}
}
String rslt = new String(out);
return rslt;
}
}
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