## org.apache.tools.tar
Class TarInputStream

    java.lang.Object
      |
      +--java.io.InputStream
            |
            +--java.io.FilterInputStream
                  |
                  +--org.apache.tools.tar.TarInputStream

public class TarInputStream
extends java.io.FilterInputStream

The TarInputStream reads a UNIX tar archive as an InputStream. methods are provided to position at each successive entry in the archive, and the read each entry as a normal input stream using read().

Author:
  Timothy Gerard Endres time@ice.com, Stefano Mazzocchi stefano@apache.org

Field Summary
`protected TarBuffer` `buffer`
`protected TarEntry` `currEntry`
`protected boolean` `debug`
`protected int` `entryOffset`
`protected int` `entrySize`
`protected boolean` `hasHitEOF`
`protected byte[]` `oneBuf`
`protected byte[]` `readBuf`

Fields inherited from class java.io.FilterInputStream
`in`

Constructor Summary
`TarInputStream(java.io.InputStream is)`
`TarInputStream(java.io.InputStream is, int blockSize)`
`TarInputStream(java.io.InputStream is, int blockSize, int recordSize)`

Method Summary
`int` `available()` Get the available data that can be read from the current entry in the archive.
`void` `close()` Closes this stream.
`void` `copyEntryContents(java.io.OutputStream out)` Copies the contents of the current tar archive entry directly into an output stream.
`TarEntry` `getNextEntry()` Get the next entry in this tar archive.
`int` `getRecordSize()` Get the record size being used by this stream's TarBuffer.
`void` `mark(int markLimit)` Since we do not support marking just yet, we do nothing.
`boolean` `markSupported()` Since we do not support marking just yet, we return false.
`int` `read()` Reads a byte from the current tar archive entry.
`int` `read(byte[] buf)` Reads bytes from the current tar archive entry.
`int` `read(byte[] buf, int offset, int numToRead)` Reads bytes from the current tar archive entry.
`void` `reset()` Since we do not support marking just yet, we do nothing.
`void` `setDebug(boolean debug)` Sets the debugging flag.
`long` `skip(long numToSkip)` Skip bytes in the input buffer.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### debug

    protected boolean debug

### hasHitEOF

    protected boolean hasHitEOF

### entrySize

    protected int entrySize

### entryOffset

    protected int entryOffset

### oneBuf

    protected byte[] oneBuf

### readBuf

    protected byte[] readBuf

### buffer

    protected TarBuffer buffer

### currEntry

    protected TarEntry currEntry

Constructor Detail

### TarInputStream

    public TarInputStream(java.io.InputStream is)

### TarInputStream

    public TarInputStream(java.io.InputStream is,
                          int blockSize)

### TarInputStream

    public TarInputStream(java.io.InputStream is,
                          int blockSize,
                          int recordSize)

Method Detail

### setDebug

    public void setDebug(boolean debug)

  Sets the debugging flag.

  Parameters:
    `debug` - True to turn on debugging.

### close

    public void close()
               throws java.io.IOException

  Closes this stream. Calls the TarBuffer's close() method.

  Overrides:
    `close` in class `java.io.FilterInputStream`
    `java.io.IOException`

### getRecordSize

    public int getRecordSize()

  Get the record size being used by this stream's TarBuffer.

  Returns:
    The TarBuffer record size.

### available

    public int available()
                  throws java.io.IOException

  Get the available data that can be read from the current entry in the archive. This does not indicate how much data is left in the entire archive, only in the current entry. This value is determined from the entry's size header field and the amount of data already read from the current entry.

  Overrides:
    `available` in class `java.io.FilterInputStream`
  Returns:
    The number of available bytes for the current entry.
    `java.io.IOException`

### skip

    public long skip(long numToSkip)
              throws java.io.IOException

  Skip bytes in the input buffer. This skips bytes in the current entry's data, not the entire archive, and will stop at the end of the current entry's data if the number to skip extends beyond that point.

  Overrides:
    `skip` in class `java.io.FilterInputStream`
  Parameters:
    `numToSkip` - The number of bytes to skip.
    `java.io.IOException`

### markSupported

    public boolean markSupported()

  Since we do not support marking just yet, we return false.

  Overrides:
    `markSupported` in class `java.io.FilterInputStream`
  Returns:
    False.

### mark

    public void mark(int markLimit)

  Since we do not support marking just yet, we do nothing.

  Overrides:
    `mark` in class `java.io.FilterInputStream`
  Parameters:
    `markLimit` - The limit to mark.

### reset

    public void reset()

  Since we do not support marking just yet, we do nothing.

  Overrides:
    `reset` in class `java.io.FilterInputStream`

### getNextEntry

    public TarEntry getNextEntry()
                          throws java.io.IOException

  Get the next entry in this tar archive. This will skip over any remaining data in the current entry, if there is one, and place the input stream at the header of the next entry, and read the header and instantiate a new TarEntry from the header bytes and return that entry. If there are no more entries in the archive, null will be returned to indicate that the end of the archive has been reached.

  Returns:
    The next TarEntry in the archive, or null.
    `java.io.IOException`

### read

    public int read()
             throws java.io.IOException

  Reads a byte from the current tar archive entry. This method simply calls read( byte[], int, int ).

  Overrides:
    `read` in class `java.io.FilterInputStream`
  Returns:
    The byte read, or -1 at EOF.
    `java.io.IOException`

### read

    public int read(byte[] buf)
             throws java.io.IOException

  Reads bytes from the current tar archive entry. This method simply calls read( byte[], int, int ).

  Overrides:
    `read` in class `java.io.FilterInputStream`
  Parameters:
    `buf` - The buffer into which to place bytes read.
  Returns:
    The number of bytes read, or -1 at EOF.
    `java.io.IOException`

### read

    public int read(byte[] buf,
                    int offset,
                    int numToRead)
             throws java.io.IOException

  Reads bytes from the current tar archive entry. This method is aware of the boundaries of the current entry in the archive and will deal with them as if they were this stream's start and EOF.

  Overrides:
    `read` in class `java.io.FilterInputStream`
  Parameters:
    `buf` - The buffer into which to place bytes read.
    `offset` - The offset at which to place bytes read.
    `numToRead` - The number of bytes to read.
  Returns:
    The number of bytes read, or -1 at EOF.
    `java.io.IOException`

### copyEntryContents

    public void copyEntryContents(java.io.OutputStream out)
                           throws java.io.IOException

  Copies the contents of the current tar archive entry directly into an output stream.

  Parameters:
    `out` - The OutputStream into which to write the entry's data.
    `java.io.IOException`

Copyright © 2000-2003 Apache Software Foundation. All Rights Reserved.