Base64public final class Base64 extends Object This class provides encode/decode for RFC 2045 Base64 as defined by
RFC 2045, N. Freed and N. Borenstein. RFC 2045:
Multipurpose Internet Mail Extensions (MIME) Part One: Format of
Internet Message Bodies. Reference 1996 |
Fields Summary |
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private static final int | BASELENGTH | private static final int | LOOKUPLENGTH | private static final int | TWENTYFOURBITGROUP | private static final int | EIGHTBIT | private static final int | SIXTEENBIT | private static final int | SIXBIT | private static final int | FOURBYTE | private static final int | SIGN | private static final byte | PAD | private static byte[] | base64Alphabet | private static byte[] | lookUpBase64Alphabet |
Methods Summary |
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public static void | decode(org.apache.tomcat.util.buf.ByteChunk base64DataBC, org.apache.tomcat.util.buf.CharChunk decodedDataCC)Decodes Base64 data into octects
int start = base64DataBC.getStart();
int end = base64DataBC.getEnd();
byte[] base64Data = base64DataBC.getBuffer();
decodedDataCC.recycle();
// handle the edge case, so we don't have to worry about it later
if(end - start == 0) { return; }
int numberQuadruple = (end - start)/FOURBYTE;
byte b1=0,b2=0,b3=0, b4=0, marker0=0, marker1=0;
// Throw away anything not in base64Data
int encodedIndex = 0;
int dataIndex = start;
char[] decodedData = null;
{
// this sizes the output array properly - rlw
int lastData = end - start;
// ignore the '=' padding
while (base64Data[start+lastData-1] == PAD)
{
if (--lastData == 0)
{
return;
}
}
decodedDataCC.allocate(lastData - numberQuadruple, -1);
decodedDataCC.setEnd(lastData - numberQuadruple);
decodedData = decodedDataCC.getBuffer();
}
for (int i = 0; i < numberQuadruple; i++)
{
dataIndex = start + i * 4;
marker0 = base64Data[dataIndex + 2];
marker1 = base64Data[dataIndex + 3];
b1 = base64Alphabet[base64Data[dataIndex]];
b2 = base64Alphabet[base64Data[dataIndex +1]];
if (marker0 != PAD && marker1 != PAD)
{
//No PAD e.g 3cQl
b3 = base64Alphabet[ marker0 ];
b4 = base64Alphabet[ marker1 ];
decodedData[encodedIndex] = (char) (( b1 <<2 | b2>>4 ) & 0xff);
decodedData[encodedIndex + 1] =
(char) ((((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ) & 0xff);
decodedData[encodedIndex + 2] = (char) (( b3<<6 | b4 ) & 0xff);
}
else if (marker0 == PAD)
{
//Two PAD e.g. 3c[Pad][Pad]
decodedData[encodedIndex] = (char) (( b1 <<2 | b2>>4 ) & 0xff);
}
else if (marker1 == PAD)
{
//One PAD e.g. 3cQ[Pad]
b3 = base64Alphabet[ marker0 ];
decodedData[encodedIndex] = (char) (( b1 <<2 | b2>>4 ) & 0xff);
decodedData[encodedIndex + 1] =
(char) ((((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ) & 0xff);
}
encodedIndex += 3;
}
| public static byte[] | encode(byte[] binaryData)Encodes hex octects into Base64.
int lengthDataBits = binaryData.length*EIGHTBIT;
int fewerThan24bits = lengthDataBits%TWENTYFOURBITGROUP;
int numberTriplets = lengthDataBits/TWENTYFOURBITGROUP;
byte encodedData[] = null;
if (fewerThan24bits != 0)
{
//data not divisible by 24 bit
encodedData = new byte[ (numberTriplets + 1 ) * 4 ];
}
else
{
// 16 or 8 bit
encodedData = new byte[ numberTriplets * 4 ];
}
byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
int encodedIndex = 0;
int dataIndex = 0;
int i = 0;
//log.debug("number of triplets = " + numberTriplets);
for ( i = 0; i<numberTriplets; i++ )
{
dataIndex = i*3;
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex + 1];
b3 = binaryData[dataIndex + 2];
//log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);
l = (byte)(b2 & 0x0f);
k = (byte)(b1 & 0x03);
encodedIndex = i * 4;
byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
byte val3 = ((b3 & SIGN)==0)?(byte)(b3>>6):(byte)((b3)>>6^0xfc);
encodedData[encodedIndex] = lookUpBase64Alphabet[ val1 ];
//log.debug( "val2 = " + val2 );
//log.debug( "k4 = " + (k<<4) );
//log.debug( "vak = " + (val2 | (k<<4)) );
encodedData[encodedIndex+1] =
lookUpBase64Alphabet[ val2 | ( k<<4 )];
encodedData[encodedIndex+2] =
lookUpBase64Alphabet[ (l <<2 ) | val3 ];
encodedData[encodedIndex+3] = lookUpBase64Alphabet[ b3 & 0x3f ];
}
// form integral number of 6-bit groups
dataIndex = i*3;
encodedIndex = i*4;
if (fewerThan24bits == EIGHTBIT )
{
b1 = binaryData[dataIndex];
k = (byte) ( b1 &0x03 );
//log.debug("b1=" + b1);
//log.debug("b1<<2 = " + (b1>>2) );
byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
encodedData[encodedIndex] = lookUpBase64Alphabet[ val1 ];
encodedData[encodedIndex + 1] = lookUpBase64Alphabet[ k<<4 ];
encodedData[encodedIndex + 2] = PAD;
encodedData[encodedIndex + 3] = PAD;
}
else if (fewerThan24bits == SIXTEENBIT)
{
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex +1 ];
l = (byte) (b2 & 0x0f);
k = (byte) (b1 & 0x03);
byte val1 = ((b1 & SIGN) == 0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
byte val2 = ((b2 & SIGN) == 0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
encodedData[encodedIndex] = lookUpBase64Alphabet[ val1 ];
encodedData[encodedIndex + 1] =
lookUpBase64Alphabet[ val2 | ( k<<4 )];
encodedData[encodedIndex + 2] = lookUpBase64Alphabet[ l<<2 ];
encodedData[encodedIndex + 3] = PAD;
}
return encodedData;
| public static boolean | isArrayByteBase64(byte[] arrayOctect)
int length = arrayOctect.length;
if (length == 0)
{
// shouldn't a 0 length array be valid base64 data?
// return false;
return true;
}
for (int i=0; i < length; i++)
{
if ( !Base64.isBase64(arrayOctect[i]) )
return false;
}
return true;
| public static boolean | isBase64(java.lang.String isValidString)
//static private final Log log = LogSource.getInstance("org.apache.commons.util.Base64");
for (int i = 0; i < BASELENGTH; i++ )
{
base64Alphabet[i] = -1;
}
for (int i = 'Z"; i >= 'A"; i--)
{
base64Alphabet[i] = (byte) (i - 'A");
}
for (int i = 'z"; i>= 'a"; i--)
{
base64Alphabet[i] = (byte) (i - 'a" + 26);
}
for (int i = '9"; i >= '0"; i--)
{
base64Alphabet[i] = (byte) (i - '0" + 52);
}
base64Alphabet['+"] = 62;
base64Alphabet['/"] = 63;
for (int i = 0; i <= 25; i++ )
lookUpBase64Alphabet[i] = (byte) ('A" + i);
for (int i = 26, j = 0; i <= 51; i++, j++ )
lookUpBase64Alphabet[i] = (byte) ('a"+ j);
for (int i = 52, j = 0; i <= 61; i++, j++ )
lookUpBase64Alphabet[i] = (byte) ('0" + j);
lookUpBase64Alphabet[62] = (byte) '+";
lookUpBase64Alphabet[63] = (byte) '/";
return isArrayByteBase64(isValidString.getBytes());
| public static boolean | isBase64(byte octect)
//shall we ignore white space? JEFF??
return (octect == PAD || base64Alphabet[octect] != -1);
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