lorill | Code :
- package jwma.webmail.util;
- public abstract class QuotedPrintable
- {
- /**
- * Convert a string from text canonical form to Quoted Printable form.
- * Line breaks (both before and after conversion) MUST be represented
- * as \r\n - any other combination is treated as binary data.
- *
- * @param s canonical text to be encoded
- * @return text in Quoted Printable form
- */
- public static String encode( String s )
- {
- int len = s.length();
- StringBuffer buffer = new StringBuffer( 2 * len );
- StringBuffer line = new StringBuffer( 240 );
- StringBuffer white = new StringBuffer( 80 );
- for (int i=0; i<len; i++)
- {
- int c = s.charAt( i );
- if ((c == '\r') && (i != len-1) && (s.charAt( i+1 ) == '\n'))
- {
- encodeEndOfLine( buffer, line, white );
- i++;
- continue;
- }
- else if ((c == ' ') || (c == '\t'))
- {
- white.append( (char)c );
- }
- else
- {
- if (white.length() != 0)
- {
- line.append( white );
- white.setLength( 0 );
- }
- if ((c >= '!') && (c <= '~') && (c != '='))
- {
- line.append( (char)c );
- }
- else
- {
- appendHex( line, c );
- }
- }
- }
- if ((line.length() != 0) || (white.length() != 0))
- {
- encodeEndOfLine( buffer, line, white );
- }
- return buffer.toString();
- }
- private static void encodeEndOfLine(
- StringBuffer buffer, StringBuffer line, StringBuffer white )
- {
- int i,j;
- for (i=0; i<white.length(); i++)
- {
- appendHex( line, white.charAt( i ));
- }
- String s = line.toString();
- int len = s.length();
- boolean split = false;
- for (i=0; i<len; i=j)
- {
- j = i + 75;
- if ((j == len-1) || (j > len)) j = len;
- if (j > 2)
- {
- if (s.charAt( j-1 ) == '=') j -= 1;
- if (s.charAt( j-2 ) == '=') j -= 2;
- }
- buffer.append( s.substring( i, j ));
- if (j != len) buffer.append( '=' );
- buffer.append( "\r\n" );
- }
- line.setLength( 0 );
- white.setLength( 0 );
- }
- private static void appendHex( StringBuffer line, int c )
- {
- c &= 0xFF;
- line.append( '=' );
- line.append( "0123456789ABCDEF".charAt( c >> 4 ));
- line.append( "0123456789ABCDEF".charAt( c & 0x0F ));
- }
- /**
- * Convert a string from Quoted Printable form to text canonical form.
- * Unrecognised sequences starting with '=' are passed through unmodified.
- * Note that this method will strip trailing whitespace from each line.
- *
- * @param s canonical text to be encoded
- * @return text in Quoted Printable form
- */
- public static String decode( String s )
- {
- if(s.startsWith("=?iso-8859-1?Q?" ))
- s = s.substring(15);
- StringBuffer buffer = new StringBuffer( s.length() );
- StringBuffer white = new StringBuffer( 80 );
- int len = s.length();
- for (int i=0; i<len; i++)
- {
- char c = s.charAt( i );
- if ((c == '=') && (i+2 < len))
- {
- char a = s.charAt( ++i );
- char b = s.charAt( ++i );
- if ((a == '\r') && (b == '\n')) continue;
- int ah = "0123456789ABCDEF".indexOf( a );
- int bh = "0123456789ABCDEF".indexOf( b );
- if ((ah == -1) || (bh == -1))
- {
- buffer.append( '=' );
- buffer.append( a );
- buffer.append( b );
- }
- else
- {
- buffer.append( (char)((ah << 4) | bh) );
- }
- }
- else if ((c == ' ') || (c == '\t'))
- {
- white.append( c );
- }
- else
- {
- if (white.length() != 0) buffer.append( white );
- buffer.append( c );
- white.setLength( 0 );
- }
- }
- s = buffer.toString();
- int index;
- while( (index=s.indexOf("=?iso-8859-1?Q?" )) >= 0)
- s = s.substring(0, index) + s.substring(index+15);
- while( (index=s.indexOf("?=" )) >= 0)
- s = s.substring(0, index) + s.substring(index+2);
- return s;
- }
- /**
- * Test whether or not a String could have been generated by encode()
- * or any similar generator which complies with the RFC.
- */
- public static boolean isProbablyEncoded( String s )
- {
- int len = s.length();
- int lineStart = 0;
- boolean white = false;
- for (int i=0; i<len; i++)
- {
- char c = s.charAt( i );
- if (i - lineStart > 76) return false;
- if ((c == '=') && (i+2 < len))
- {
- char a = s.charAt( ++i );
- char b = s.charAt( ++i );
- if ((a == '\r') && (b == '\n'))
- {
- white = false;
- lineStart = i+1;
- continue;
- }
- if ("0123456789ABCDEF".indexOf( a ) == -1) return false;
- if ("0123456789ABCDEF".indexOf( b ) == -1) return false;
- }
- else if ((c == '\r') && (i+1 < len))
- {
- if (white) return false;
- char a = s.charAt( ++i );
- if (a != '\n') return false;
- lineStart = i+1;
- }
- else
- {
- if ((c == ' ') || (c == '\t'))
- white = true;
- else if ((c >= '!') && (c <= '~') && (c != '='))
- white = false;
- else
- return false;
- }
- }
- return true;
- }
- }
|
mais je sais plus ou j'ai emprunté ca  |
