org.apache.commons.codec.binary

## Class Base32

- java.lang.Object
- - org.apache.commons.codec.binary.BaseNCodec
  - - org.apache.commons.codec.binary.Base32

- All Implemented Interfaces:
    BinaryDecoder, BinaryEncoder, Decoder, Encoder

      public class Base32
      extends BaseNCodec

  Provides Base32 encoding and decoding as defined by RFC 4648.

  The class can be parameterized in the following manner with various constructors:

  - Whether to use the "base32hex" variant instead of the default "base32"
  - Line length: Default 76. Line length that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.
  - Line separator: Default is CRLF ("\r\n")

  This class operates directly on byte streams, and not character streams.

  This class is thread-safe.

  Since:
    1.5
  Version:
    $Id: Base32.java 1619949 2014-08-22 22:56:08Z ggregory $
  See Also:
    RFC 4648

- - ### Field Summary

    - ### Fields inherited from class org.apache.commons.codec.binary.BaseNCodec

      `lineLength, MASK_8BITS, MIME_CHUNK_SIZE, pad, PAD, PAD_DEFAULT, PEM_CHUNK_SIZE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Base32()` Creates a Base32 codec used for decoding and encoding.
    `Base32(boolean useHex)` Creates a Base32 codec used for decoding and encoding.
    `Base32(boolean useHex, byte pad)` Creates a Base32 codec used for decoding and encoding.
    `Base32(byte pad)` Creates a Base32 codec used for decoding and encoding.
    `Base32(int lineLength)` Creates a Base32 codec used for decoding and encoding.
    `Base32(int lineLength, byte[] lineSeparator)` Creates a Base32 codec used for decoding and encoding.
    `Base32(int lineLength, byte[] lineSeparator, boolean useHex)` Creates a Base32 / Base32 Hex codec used for decoding and encoding.
    `Base32(int lineLength, byte[] lineSeparator, boolean useHex, byte pad)` Creates a Base32 / Base32 Hex codec used for decoding and encoding.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `isInAlphabet(byte octet)` Returns whether or not the `octet` is in the Base32 alphabet.

    - ### Methods inherited from class org.apache.commons.codec.binary.BaseNCodec

      `containsAlphabetOrPad, decode, decode, decode, encode, encode, encodeAsString, encodeToString, ensureBufferSize, getDefaultBufferSize, getEncodedLength, isInAlphabet, isInAlphabet, isWhiteSpace`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Base32

          public Base32()

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length is 0 (no chunking).

    - #### Base32

          public Base32(byte pad)

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length is 0 (no chunking).

      Parameters:
        `pad` - byte used as padding byte.

    - #### Base32

          public Base32(boolean useHex)

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length is 0 (no chunking).

      Parameters:
        `useHex` - if `true` then use Base32 Hex alphabet

    - #### Base32

          public Base32(boolean useHex,
                byte pad)

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length is 0 (no chunking).

      Parameters:
        `useHex` - if `true` then use Base32 Hex alphabet
        `pad` - byte used as padding byte.

    - #### Base32

          public Base32(int lineLength)

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length is given in the constructor, the line separator is CRLF.

      Parameters:
        `lineLength` - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.

    - #### Base32

          public Base32(int lineLength,
                byte[] lineSeparator)

      Creates a Base32 codec used for decoding and encoding.

      When encoding the line length and line separator are given in the constructor.

      Line lengths that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.

      Parameters:
        `lineLength` - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
        `lineSeparator` - Each line of encoded data will end with this sequence of bytes.
      Throws:
        `IllegalArgumentException` - The provided lineSeparator included some Base32 characters. That's not going to work!

    - #### Base32

          public Base32(int lineLength,
                byte[] lineSeparator,
                boolean useHex)

      Creates a Base32 / Base32 Hex codec used for decoding and encoding.

      When encoding the line length and line separator are given in the constructor.

      Line lengths that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.

      Parameters:
        `lineLength` - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
        `lineSeparator` - Each line of encoded data will end with this sequence of bytes.
        `useHex` - if `true`, then use Base32 Hex alphabet, otherwise use Base32 alphabet
      Throws:
        `IllegalArgumentException` - The provided lineSeparator included some Base32 characters. That's not going to work! Or the lineLength > 0 and lineSeparator is null.

    - #### Base32

          public Base32(int lineLength,
                byte[] lineSeparator,
                boolean useHex,
                byte pad)

      Creates a Base32 / Base32 Hex codec used for decoding and encoding.

      When encoding the line length and line separator are given in the constructor.

      Line lengths that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.

      Parameters:
        `lineLength` - Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8). If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
        `lineSeparator` - Each line of encoded data will end with this sequence of bytes.
        `useHex` - if `true`, then use Base32 Hex alphabet, otherwise use Base32 alphabet
        `pad` - byte used as padding byte.
      Throws:
        `IllegalArgumentException` - The provided lineSeparator included some Base32 characters. That's not going to work! Or the lineLength > 0 and lineSeparator is null.

  - ### Method Detail

    - #### isInAlphabet

          public boolean isInAlphabet(byte octet)

      Returns whether or not the `octet` is in the Base32 alphabet.
      Specified by:
        `isInAlphabet` in class `BaseNCodec`
      Parameters:
        `octet` - The value to test
      Returns:
        `true` if the value is defined in the the Base32 alphabet `false` otherwise.

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