# ArArchiveInputStream (Apache Commons Compress 1.13 API)

org.apache.commons.compress.archivers.ar

## Class ArArchiveInputStream

- java.lang.Object
- - java.io.InputStream
  - - org.apache.commons.compress.archivers.ArchiveInputStream
    - - org.apache.commons.compress.archivers.ar.ArArchiveInputStream

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public class ArArchiveInputStream
      extends ArchiveInputStream

  Implements the "ar" archive format as an input stream.
  This class is not thread-safe

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ArArchiveInputStream(InputStream pInput)` Constructs an Ar input stream with the referenced stream

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `ArArchiveEntry` | `getNextArEntry()` Returns the next AR entry in this stream.
    `ArchiveEntry` | `getNextEntry()` Returns the next Archive Entry in this Stream.
    `static boolean` | `matches(byte[] signature, int length)` Checks if the signature matches ASCII "!
    `int` | `read(byte[] b, int off, int len)`

    - ### Methods inherited from class org.apache.commons.compress.archivers.ArchiveInputStream

      `canReadEntryData, count, count, getBytesRead, getCount, pushedBackBytes, read`

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

      `available, mark, markSupported, read, reset, skip`

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

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

- - ### Constructor Detail

    - #### ArArchiveInputStream

          public ArArchiveInputStream(InputStream pInput)

      Constructs an Ar input stream with the referenced stream
      Parameters:
        `pInput` - the ar input stream

  - ### Method Detail

    - #### getNextArEntry

          public ArArchiveEntry getNextArEntry()
                                        throws IOException

      Returns the next AR entry in this stream.
      Returns:
        the next AR entry.
      Throws:
        `IOException` - if the entry could not be read

    - #### getNextEntry

          public ArchiveEntry getNextEntry()
                                    throws IOException

      Description copied from class: `ArchiveInputStream`
      Returns the next Archive Entry in this Stream.
      Specified by:
        `getNextEntry` in class `ArchiveInputStream`
      Returns:
        the next entry, or `null` if there are no more entries
      Throws:
        `IOException` - if the next entry could not be read

    - #### close

          public void close()
                     throws IOException

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Overrides:
        `close` in class `InputStream`
      Throws:
        `IOException`

    - #### read

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

      Overrides:
        `read` in class `InputStream`
      Throws:
        `IOException`

    - #### matches

          public static boolean matches(byte[] signature,
                        int length)

      Checks if the signature matches ASCII "!<arch>" followed by a single LF control character
      Parameters:
        `signature` - the bytes to check
        `length` - the number of bytes to check
      Returns:
        true, if this stream is an Ar archive stream, false otherwise

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