Does not insert or interpret whitespace as described in RFC * 1521. If you require this you must pre/post process your data. *
Note that in a web context the usual case is to not want * linebreaks or other white space in the encoded output. * */ public class B64Code { // ------------------------------------------------------------------ static final char __pad='='; static final char[] __rfc1421alphabet= { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' }; static final byte[] __rfc1421nibbles; static { __rfc1421nibbles=new byte[256]; for (int i=0;i<256;i++) __rfc1421nibbles[i]=-1; for (byte b=0;b<64;b++) __rfc1421nibbles[(byte)__rfc1421alphabet[b]]=b; __rfc1421nibbles[(byte)__pad]=0; } // ------------------------------------------------------------------ /** * Base 64 encode as described in RFC 1421. *
Does not insert whitespace as described in RFC 1521. * @param s String to encode. * @return String containing the encoded form of the input. */ static public String encode(String s) { try { return encode(s,null); } catch (UnsupportedEncodingException e) { throw new IllegalArgumentException(e.toString()); } } // ------------------------------------------------------------------ /** * Base 64 encode as described in RFC 1421. *
Does not insert whitespace as described in RFC 1521. * @param s String to encode. * @param charEncoding String representing the name of * the character encoding of the provided input String. * @return String containing the encoded form of the input. */ static public String encode(String s,String charEncoding) throws UnsupportedEncodingException { byte[] bytes; if (charEncoding==null) bytes=s.getBytes(StringUtil.__ISO_8859_1); else bytes=s.getBytes(charEncoding); return new String(encode(bytes)); } // ------------------------------------------------------------------ /** * Fast Base 64 encode as described in RFC 1421. *
Does not insert whitespace as described in RFC 1521. *
Avoids creating extra copies of the input/output.
* @param b byte array to encode.
* @return char array containing the encoded form of the input.
*/
static public char[] encode(byte[] b)
{
if (b==null)
return null;
int bLen=b.length;
int cLen=((bLen+2)/3)*4;
char c[]=new char[cLen];
int ci=0;
int bi=0;
byte b0, b1, b2;
int stop=(bLen/3)*3;
while (bi Does not insert whitespace as described in RFC 1521, unless rfc2045 is passed as true.
* Avoids creating extra copies of the input/output.
* @param b byte array to encode.
* @param rfc2045 If true, break lines at 76 characters with CRLF
* @return char array containing the encoded form of the input.
*/
static public char[] encode(byte[] b, boolean rfc2045)
{
if (b==null)
return null;
if (!rfc2045)
return encode(b);
int bLen=b.length;
int cLen=((bLen+2)/3)*4;
cLen+=2+2*(cLen/76);
char c[]=new char[cLen];
int ci=0;
int bi=0;
byte b0, b1, b2;
int stop=(bLen/3)*3;
int l=0;
while (bi Unlike {@link #decode(char[])}, extra whitespace is ignored.
* @param encoded String to decode.
* @param charEncoding String representing the character encoding
* used to map the decoded bytes into a String.
* @return String decoded byte array.
* @throws UnsupportedEncodingException if the encoding is not supported
* @throws IllegalArgumentException if the input is not a valid
* B64 encoding.
*/
static public String decode(String encoded,String charEncoding)
throws UnsupportedEncodingException
{
byte[] decoded=decode(encoded);
if (charEncoding==null)
return new String(decoded);
return new String(decoded,charEncoding);
}
/* ------------------------------------------------------------ */
/**
* Fast Base 64 decode as described in RFC 1421.
*
* Unlike other decode methods, this does not attempt to
* cope with extra whitespace as described in RFC 1521/2045.
* Avoids creating extra copies of the input/output.
* Note this code has been flattened for performance.
* @param b char array to decode.
* @return byte array containing the decoded form of the input.
* @throws IllegalArgumentException if the input is not a valid
* B64 encoding.
*/
static public byte[] decode(char[] b)
{
if (b==null)
return null;
int bLen=b.length;
if (bLen%4!=0)
throw new IllegalArgumentException("Input block size is not 4");
int li=bLen-1;
while (li>=0 && b[li]==(byte)__pad)
li--;
if (li<0)
return new byte[0];
// Create result array of exact required size.
int rLen=((li+1)*3)/4;
byte r[]=new byte[rLen];
int ri=0;
int bi=0;
int stop=(rLen/3)*3;
byte b0,b1,b2,b3;
try
{
while (ri Unlike {@link #decode(char[])}, extra whitespace is ignored.
* @param encoded String to decode.
* @return byte array containing the decoded form of the input.
* @throws IllegalArgumentException if the input is not a valid
* B64 encoding.
*/
static public byte[] decode(String encoded)
{
if (encoded==null)
return null;
ByteArrayOutputStream bout = new ByteArrayOutputStream(4*encoded.length()/3);
decode(encoded, bout);
return bout.toByteArray();
}
/* ------------------------------------------------------------ */
/**
* Base 64 decode as described in RFC 2045.
* Unlike {@link #decode(char[])}, extra whitespace is ignored.
* @param encoded String to decode.
* @param output stream for decoded bytes
* @return byte array containing the decoded form of the input.
* @throws IllegalArgumentException if the input is not a valid
* B64 encoding.
*/
static public void decode (String encoded, ByteArrayOutputStream bout)
{
if (encoded==null)
return;
if (bout == null)
throw new IllegalArgumentException("No outputstream for decoded bytes");
int ci=0;
byte nibbles[] = new byte[4];
int s=0;
while (ci