## org.das2.util.Base64

This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme. The implementation of this class supports the following types of Base64 as specified in RFC 4648 and RFC 2045.

- Basic

  Uses "The Base64 Alphabet" as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.

- URL and Filename safe

  Uses the "URL and Filename safe Base64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding. The encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters outside the base64 alphabet.

- MIME

  Uses the "The Base64 Alphabet" as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded output must be represented in lines of no more than 76 characters each and uses a carriage return {@code '\r'} followed immediately by a linefeed {@code '\n'} as the line separator. No line separator is added to the end of the encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in decoding operation.

Unless otherwise noted, passing a {@code null} argument to a method of this class will cause a {@link java.lang.NullPointerException NullPointerException} to be thrown.

## getDecoder

getDecoder( ) → org.das2.util.Base64.Decoder

Returns a {@link Decoder} that decodes using the Basic type base64 encoding scheme.

### Returns:

A Base64 decoder.
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## getEncoder

getEncoder( ) → org.das2.util.Base64.Encoder

Returns a {@link Encoder} that encodes using the Basic type base64 encoding scheme.

### Returns:

A Base64 encoder.
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## getMimeDecoder

getMimeDecoder( ) → org.das2.util.Base64.Decoder

Returns a {@link Decoder} that decodes using the MIME type base64 decoding scheme.

### Returns:

A Base64 decoder.
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## getMimeEncoder

getMimeEncoder( ) → org.das2.util.Base64.Encoder

Returns a {@link Encoder} that encodes using the MIME type base64 encoding scheme.

### Returns:

A Base64 encoder.
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## getMimeEncoder

getMimeEncoder( int lineLength, byte[] lineSeparator ) → org.das2.util.Base64.Encoder

Returns a {@link Encoder} that encodes using the MIME type base64 encoding scheme with specified line length and line separators.

### Parameters

lineLength - the length of each output line (rounded down to nearest multiple of 4). If {@code lineLength <= 0} the output will not be separated in lines
lineSeparator - the line separator for each output line

### Returns:

A Base64 encoder.
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## getUrlDecoder

getUrlDecoder( ) → org.das2.util.Base64.Decoder

Returns a {@link Decoder} that decodes using the URL and Filename safe type base64 encoding scheme.

### Returns:

A Base64 decoder.
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## getUrlEncoder

getUrlEncoder( ) → org.das2.util.Base64.Encoder

Returns a {@link Encoder} that encodes using the URL and Filename safe type base64 encoding scheme.

### Returns:

A Base64 encoder.
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