org.apache.commons.codec.binary

## Class BaseNCodecInputStream

- java.lang.Object
- - java.io.InputStream
  - - java.io.FilterInputStream
    - - org.apache.commons.codec.binary.BaseNCodecInputStream

- All Implemented Interfaces:
    Closeable, AutoCloseable
  Direct Known Subclasses:
    Base32InputStream, Base64InputStream

      public class BaseNCodecInputStream
      extends FilterInputStream

  Abstract superclass for Base-N input streams.
  Since:
    1.5
  Version:
    $Id: BaseNCodecInputStream.java 1429868 2013-01-07 16:08:05Z ggregory $

- - ### Field Summary

    - ### Fields inherited from class java.io.FilterInputStream

      `in`

  - ### Constructor Summary

    Constructors
    Modifier | Constructor and Description
    --- | ---
    `protected` | `BaseNCodecInputStream(InputStream in, BaseNCodec baseNCodec, boolean doEncode)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `available()`
    `void` | `mark(int readLimit)` Marks the current position in this input stream.
    `boolean` | `markSupported()`
    `int` | `read()` Reads one `byte` from this input stream.
    `int` | `read(byte[] b, int offset, int len)` Attempts to read `len` bytes into the specified `b` array starting at `offset` from this InputStream.
    `void` | `reset()` Repositions this stream to the position at the time the mark method was last called on this input stream.
    `long` | `skip(long n)`

    - ### Methods inherited from class java.io.FilterInputStream

      `close, read`

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

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

- - ### Constructor Detail

    - #### BaseNCodecInputStream

          protected BaseNCodecInputStream(InputStream in,
                               BaseNCodec baseNCodec,
                               boolean doEncode)

  - ### Method Detail

    - #### available

          public int available()
                        throws IOException

      Overrides:
        `available` in class `FilterInputStream`
      Returns:
        `0` if the `InputStream` has reached `EOF`, `1` otherwise
      Throws:
        `IOException`
      Since:
        1.7

    - #### mark

          public void mark(int readLimit)

      Marks the current position in this input stream.

      The `mark(int)` method of `BaseNCodecInputStream` does nothing.

      Overrides:
        `mark` in class `FilterInputStream`
      Parameters:
        `readLimit` - the maximum limit of bytes that can be read before the mark position becomes invalid.
      Since:
        1.7

    - #### markSupported

          public boolean markSupported()

      Overrides:
        `markSupported` in class `FilterInputStream`
      Returns:
        always returns `false`

    - #### read

          public int read()
                   throws IOException

      Reads one `byte` from this input stream.
      Overrides:
        `read` in class `FilterInputStream`
      Returns:
        the byte as an integer in the range 0 to 255. Returns -1 if EOF has been reached.
      Throws:
        `IOException` - if an I/O error occurs.

    - #### read

          public int read(byte[] b,
                 int offset,
                 int len)
                   throws IOException

      Attempts to read `len` bytes into the specified `b` array starting at `offset` from this InputStream.
      Overrides:
        `read` in class `FilterInputStream`
      Parameters:
        `b` - destination byte array
        `offset` - where to start writing the bytes
        `len` - maximum number of bytes to read
      Returns:
        number of bytes read
      Throws:
        `IOException` - if an I/O error occurs.
        `NullPointerException` - if the byte array parameter is null
        `IndexOutOfBoundsException` - if offset, len or buffer size are invalid

    - #### reset

          public void reset()
                     throws IOException

      Repositions this stream to the position at the time the mark method was last called on this input stream.

      The `reset()` method of `BaseNCodecInputStream` does nothing except throw an `IOException`.

      Overrides:
        `reset` in class `FilterInputStream`
      Throws:
        `IOException` - if this method is invoked
      Since:
        1.7

    - #### skip

          public long skip(long n)
                    throws IOException

      Overrides:
        `skip` in class `FilterInputStream`
      Throws:
        `IllegalArgumentException` - if the provided skip length is negative
        `IOException`
      Since:
        1.7

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