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package JACE.Connection;
import JACE.OS.*;
/**
* Collection of methods concerning HTTP.
*/
public class HTTPHelper
{
/**
* Alphabet used in encoding and decoding basic base64 authentication.
* See the HTTP 1.1 RFC for details.
*/
public static String Alphabet
= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* Decode a secret encrypted with the basic base64 HTTP 1.1 authentication
* scheme.
*
*@param secret Message to decode
*@return null on error, decoded String on success
*/
public static String DecodeBase64 (String secret)
{
StringBuffer output = new StringBuffer ();
boolean inalphabet [] = new boolean[256];
char decoder [] = new char [256];
for (int i = 0; i < 256; i++) {
inalphabet [i] = false;
decoder [i] = 0;
}
for (int i = Alphabet.length () - 1;
i >= 0;
i--)
{
inalphabet [(int)Alphabet.charAt (i)] = true;
decoder [(int)Alphabet.charAt (i)] = (char)i;
}
int inidx = 0;
int c = 0;
int char_count = 0;
int bits = 0;
boolean error = false;
while (inidx < secret.length ())
{
c = secret.charAt (inidx++);
if (c == '=')
break;
if (c > 255 || !inalphabet[(int)c])
continue;
bits += decoder[c];
char_count++;
if (char_count == 4) {
output.append ((char) (bits >> 16));
output.append ((char) ((bits >> 8) & 0xff));
output.append ((char) (bits & 0xff));
bits = 0;
char_count = 0;
} else
bits <<= 6;
}
if (c == '\0') {
if (char_count != 0) {
ACE.DEBUG ("base64 encoding incomplete: at least "
+ ((4 - char_count) * 6) + " bits truncated");
error = true;
}
} else {
// c == '='
switch (char_count)
{
case 1:
ACE.DEBUG ("output so far: " + output.toString ());
ACE.DEBUG ("base64 encoding incomplete: at least 2 bits missing");
error = true;
break;
case 2:
output.append ((char) (bits >> 10));
break;
case 3:
output.append ((char) (bits >> 16));
output.append ((char) ((bits >> 8) & 0xff));
break;
}
}
if (!error)
return output.toString ();
else
return null;
}
/**
* Encode a message with the basic base64 HTTP 1.1 authentication
* scheme. Adapted from James' JAWS HTTP_Helpers code.
*
*@param secret Message to encode
*@return null on error, an encoded String on success
*/
public static String EncodeBase64 (String secret)
{
StringBuffer output = new StringBuffer ();
// Index of the input string
int inidx = 0;
// character value
int c;
int char_count = 0;
int bits = 0;
boolean error = false;
while (inidx < secret.length())
{
c = secret.charAt(inidx++);
// This will mess up internationalization. I wonder if it is really
// necessary for HTTP?
if (c > 255)
{
ACE.DEBUG ("encountered char > 255 (decimal %d): " + c);
error = true;
break;
}
bits += c;
char_count++;
if (char_count == 3)
{
output.append(HTTPHelper.Alphabet.charAt(bits >> 18));
output.append(HTTPHelper.Alphabet.charAt((bits >> 12) & 0x3f));
output.append(HTTPHelper.Alphabet.charAt((bits >> 6) & 0x3f));
output.append(HTTPHelper.Alphabet.charAt(bits & 0x3f));
bits = 0;
char_count = 0;
}
else
bits <<= 8;
}
if (!error)
{
if (char_count != 0)
{
bits <<= 16 - (8 * char_count);
output.append(HTTPHelper.Alphabet.charAt(bits >> 18));
output.append(HTTPHelper.Alphabet.charAt((bits >> 12) & 0x3f));
if (char_count == 1)
{
output.append("==");
}
else
{
output.append(HTTPHelper.Alphabet.charAt((bits >> 6) & 0x3f));
output.append('=');
}
}
return output.toString();
}
// Returns null on error
return null;
}
private HTTPHelper () {}
}
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