com.google.enterprise.connector.util

Class Base64

java.lang.Object

com.google.enterprise.connector.util.Base64

public class Base64
extends java.lang.Object

Base64 converter class. This code is not a full-blown MIME encoder; it simply converts binary data to Base64 data and back.

Since:

2.8

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	ALPHABET The 64 valid Base64 encoding characters.
static byte[]	WEBSAFE_ALPHABET The 64 valid web safe Base64 encoding characters.

Method Summary

Modifier and Type	Method and Description
static byte[]	decode(byte[] source) Decodes Base64 content in byte array format and returns the decoded byte array.
static byte[]	decode(byte[] source, int off, int len) Decodes Base64 content in byte array format and returns the decoded byte array.
static byte[]	decode(java.lang.String source) Decodes data from Base64 notation.
static java.lang.String	encode(byte[] source) Encodes a byte array into Base64 notation.
static java.lang.String	encode(byte[] source, int off, int len, byte[] alphabet, boolean doPadding) Encodes a byte array into Base64 notation.
static byte[]	encode(byte[] source, int off, int len, byte[] alphabet, int maxLineLength) Encodes a byte array into Base64 notation.
static java.lang.String	encodeWebSafe(byte[] source, boolean doPadding) Encodes a byte array into web safe Base64 notation.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ALPHABET

public static final byte[] ALPHABET

The 64 valid Base64 encoding characters.

WEBSAFE_ALPHABET

public static final byte[] WEBSAFE_ALPHABET

The 64 valid web safe Base64 encoding characters.

Method Detail

encode

public static java.lang.String encode(byte[] source)

Encodes a byte array into Base64 notation. Equivalent to calling encodeBytes(source, 0, source.length)

Parameters:

source - the binary data to encode

Returns:

the Base64-encoded output String

encodeWebSafe

public static java.lang.String encodeWebSafe(byte[] source,
                                             boolean doPadding)

Encodes a byte array into web safe Base64 notation.

Parameters:

source - the binary data to encode

doPadding - If true, pad the result with '=' chars if it does not fall on 3 byte boundaries.

Returns:

the Base64-encoded output String

encode

public static java.lang.String encode(byte[] source,
                                      int off,
                                      int len,
                                      byte[] alphabet,
                                      boolean doPadding)

Encodes a byte array into Base64 notation.

Parameters:

source - the binary data to encode

off - offset in array where conversion should begin

len - length of data to convert

alphabet - the encoding alphabet

doPadding - If true, pad the result with '=' chars if it does not fall on 3 byte boundaries.

Returns:

the Base64-encoded output String

encode

public static byte[] encode(byte[] source,
                            int off,
                            int len,
                            byte[] alphabet,
                            int maxLineLength)

Encodes a byte array into Base64 notation.

Parameters:

source - the data to convert

off - offset in array where conversion should begin

len - length of data to convert

alphabet - the encoding alphabet

maxLineLength - the maximum length of each line of output

Returns:

a byte array containing the Base64-encoded output

decode

public static byte[] decode(java.lang.String source)
                     throws Base64DecoderException

Decodes data from Base64 notation. Understands either standard or web-safe encoding.

Parameters:

source - the Base64-encoded String to decode

Returns:

a byte array containing the decoded data

Throws:

Base64DecoderException - if the source does not contain valid Base64-encoded data

decode

public static byte[] decode(byte[] source)
                     throws Base64DecoderException

Decodes Base64 content in byte array format and returns the decoded byte array. Understands either standard or web-safe encoding.

Parameters:

source - the Base64-encoded data to decode

Returns:

a byte array containing the decoded data

Throws:

Base64DecoderException - if the source does not contain valid Base64-encoded data

decode

public static byte[] decode(byte[] source,
                            int off,
                            int len)
                     throws Base64DecoderException

Decodes Base64 content in byte array format and returns the decoded byte array. Understands either standard or web-safe encoding.

Parameters:

source - the Base64-encoded data to decode

off - the offset into source to begin decoding

len - the number of characters to decode

Returns:

a byte array containing the decoded data

Throws:

Base64DecoderException - if the source does not contain valid Base64-encoded data