## org.apache.tools.tar
Class TarBuffer

    java.lang.Object
      org.apache.tools.tar.TarBuffer

public class TarBuffer
extends java.lang.Object

The TarBuffer class implements the tar archive concept of a buffered input stream. This concept goes back to the days of blocked tape drives and special io devices. In the Java universe, the only real function that this class performs is to ensure that files have the correct "block" size, or other tars will complain.

You should never have a need to access this class directly. TarBuffers are created by Tar IO Streams.

Author:
  Timothy Gerard Endres time@ice.com

Field Summary
`static int` `DEFAULT_BLKSIZE`
`static int` `DEFAULT_RCDSIZE`

Constructor Summary
`TarBuffer(java.io.InputStream inStream)`
`TarBuffer(java.io.InputStream inStream, int blockSize)`
`TarBuffer(java.io.InputStream inStream, int blockSize, int recordSize)`
`TarBuffer(java.io.OutputStream outStream)`
`TarBuffer(java.io.OutputStream outStream, int blockSize)`
`TarBuffer(java.io.OutputStream outStream, int blockSize, int recordSize)`

Method Summary
`void` `close()` Close the TarBuffer.
`int` `getBlockSize()` Get the TAR Buffer's block size.
`int` `getCurrentBlockNum()` Get the current block number, zero based.
`int` `getCurrentRecordNum()` Get the current record number, within the current block, zero based.
`int` `getRecordSize()` Get the TAR Buffer's record size.
`boolean` `isEOFRecord(byte[] record)` Determine if an archive record indicate End of Archive.
`byte[]` `readRecord()` Read a record from the input stream and return the data.
`void` `setDebug(boolean debug)` Set the debugging flag for the buffer.
`void` `skipRecord()` Skip over a record on the input stream.
`void` `writeRecord(byte[] record)` Write an archive record to the archive.
`void` `writeRecord(byte[] buf, int offset)` Write an archive record to the archive, where the record may be inside of a larger array buffer.

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

Field Detail

### DEFAULT_RCDSIZE

    public static final int DEFAULT_RCDSIZE

See Also:
  Constant Field Values

### DEFAULT_BLKSIZE

    public static final int DEFAULT_BLKSIZE

See Also:
  Constant Field Values

Constructor Detail

### TarBuffer

    public TarBuffer(java.io.InputStream inStream)

### TarBuffer

    public TarBuffer(java.io.InputStream inStream,
                     int blockSize)

### TarBuffer

    public TarBuffer(java.io.InputStream inStream,
                     int blockSize,
                     int recordSize)

### TarBuffer

    public TarBuffer(java.io.OutputStream outStream)

### TarBuffer

    public TarBuffer(java.io.OutputStream outStream,
                     int blockSize)

### TarBuffer

    public TarBuffer(java.io.OutputStream outStream,
                     int blockSize,
                     int recordSize)

Method Detail

### getBlockSize

    public int getBlockSize()

  Get the TAR Buffer's block size. Blocks consist of multiple records.

### getRecordSize

    public int getRecordSize()

  Get the TAR Buffer's record size.

### setDebug

    public void setDebug(boolean debug)

  Set the debugging flag for the buffer.

  Parameters:
    `debug` - If true, print debugging output.

### isEOFRecord

    public boolean isEOFRecord(byte[] record)

  Determine if an archive record indicate End of Archive. End of archive is indicated by a record that consists entirely of null bytes.

  Parameters:
    `record` - The record data to check.

### skipRecord

    public void skipRecord()
                    throws java.io.IOException

  Skip over a record on the input stream.

  Throws:
    `java.io.IOException`

### readRecord

    public byte[] readRecord()
                      throws java.io.IOException

  Read a record from the input stream and return the data.

  Returns:
    The record data.
  Throws:
    `java.io.IOException`

### getCurrentBlockNum

    public int getCurrentBlockNum()

  Get the current block number, zero based.

  Returns:
    The current zero based block number.

### getCurrentRecordNum

    public int getCurrentRecordNum()

  Get the current record number, within the current block, zero based. Thus, current offset = (currentBlockNum * recsPerBlk) + currentRecNum.

  Returns:
    The current zero based record number.

### writeRecord

    public void writeRecord(byte[] record)
                     throws java.io.IOException

  Write an archive record to the archive.

  Parameters:
    `record` - The record data to write to the archive.
  Throws:
    `java.io.IOException`

### writeRecord

    public void writeRecord(byte[] buf,
                            int offset)
                     throws java.io.IOException

  Write an archive record to the archive, where the record may be inside of a larger array buffer. The buffer must be "offset plus record size" long.

  Parameters:
    `buf` - The buffer containing the record data to write.
    `offset` - The offset of the record data within buf.
  Throws:
    `java.io.IOException`

### close

    public void close()
               throws java.io.IOException

  Close the TarBuffer. If this is an output buffer, also flush the current block before closing.

  Throws:
    `java.io.IOException`

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