com.myJava.file.archive.tar
Class TarInputStream

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.FilterInputStream
          extended by com.myJava.file.archive.tar.TarInputStream
All Implemented Interfaces:
java.io.Closeable

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(). Kerry Menzel Contributed the code to support file sizes greater than 2GB (longs versus ints).

Version:
$Revision: 1.9 $
Author:
Timothy Gerard Endres,
See Also:
TarBuffer, TarHeader,

CAUTION :
This file has been integrated into Areca.
It is has also possibly been adapted to meet Areca's needs. If such modifications has been made, they are described above.
Thanks to the authors for their work.
Areca Build ID : 7299034069467778562

Nested Class Summary
 class TarInputStream.EntryAdapter
           
static interface TarInputStream.EntryFactory
          This interface is provided, with the method setEntryFactory(), to allow the programmer to have their own TarEntry subclass instantiated for the entries return from getNextEntry().
 
Field Summary
protected  TarBuffer buffer
           
protected  TarEntry currEntry
           
protected  boolean debug
           
protected  TarInputStream.EntryFactory eFactory
           
protected  long entryOffset
           
protected  long 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.
 long getEntryPosition()
          Get the number of bytes into the current TarEntry.
 TarEntry getNextEntry()
          Get the next entry in this tar archive.
 int getRecordSize()
          Get the record size being used by this stream's TarBuffer.
 long getStreamPosition()
          Get the number of bytes into the stream we are currently at.
 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 setBufferDebug(boolean debug)
          Sets the debugging flag in this stream's TarBuffer.
 void setDebug(boolean debugF)
          Sets the debugging flag.
 void setEntryFactory(TarInputStream.EntryFactory factory)
          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 long entrySize

entryOffset

protected long entryOffset

oneBuf

protected byte[] oneBuf

readBuf

protected byte[] readBuf

buffer

protected TarBuffer buffer

currEntry

protected TarEntry currEntry

eFactory

protected TarInputStream.EntryFactory eFactory
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 debugF)
Sets the debugging flag.

Parameters:
debugF - True to turn on debugging.

setEntryFactory

public void setEntryFactory(TarInputStream.EntryFactory factory)
Sets the debugging flag.

Parameters:
debugF - True to turn on debugging.

setBufferDebug

public void setBufferDebug(boolean debug)
Sets the debugging flag in this stream's TarBuffer.

Parameters:
debugF - True to turn on debugging.

close

public void close()
           throws java.io.IOException
Closes this stream. Calls the TarBuffer's close() method.

Specified by:
close in interface java.io.Closeable
Overrides:
close in class java.io.FilterInputStream
Throws:
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.
Throws:
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.
Returns:
The actual number of bytes skipped.
Throws:
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

getEntryPosition

public long getEntryPosition()
Get the number of bytes into the current TarEntry. This method returns the number of bytes that have been read from the current TarEntry's data.


getStreamPosition

public long getStreamPosition()
Get the number of bytes into the stream we are currently at. This method accounts for the blocking stream that tar uses, so it represents the actual position in input stream, as opposed to the place where the tar archive parsing is.


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.
Throws:
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.
Throws:
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.
Throws:
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.
Throws:
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.
Throws:
java.io.IOException