Package org.apache.tools.tar

Class TarInputStream

java.lang.Object
java.io.InputStream
java.io.FilterInputStream
org.apache.tools.tar.TarInputStream
All Implemented Interfaces:
Closeable, AutoCloseable
public class TarInputStream extends 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().

  • Field Details

    • debug

      protected boolean debug

    • hasHitEOF

      protected boolean hasHitEOF

    • entrySize

      protected long entrySize

    • entryOffset

      protected long entryOffset

    • readBuf

      protected byte[] readBuf

    • buffer

      protected TarBuffer buffer

    • currEntry

      protected TarEntry currEntry

    • oneBuf

      protected byte[] oneBuf
      This contents of this array is not used at all in this class, it is only here to avoid repeated object creation during calls to the no-arg read method.

  • Constructor Details

    • TarInputStream

      public TarInputStream(InputStream is)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use

    • TarInputStream

      public TarInputStream(InputStream is, String encoding)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use
      encoding - name of the encoding to use for file names

    • TarInputStream

      public TarInputStream(InputStream is, int blockSize)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use
      blockSize - the block size to use

    • TarInputStream

      public TarInputStream(InputStream is, int blockSize, String encoding)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use
      blockSize - the block size to use
      encoding - name of the encoding to use for file names

    • TarInputStream

      public TarInputStream(InputStream is, int blockSize, int recordSize)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use
      blockSize - the block size to use
      recordSize - the record size to use

    • TarInputStream

      public TarInputStream(InputStream is, int blockSize, int recordSize, String encoding)
      Constructor for TarInputStream.
      Parameters:
      is - the input stream to use
      blockSize - the block size to use
      recordSize - the record size to use
      encoding - name of the encoding to use for file names

  • Method Details

    • setDebug

      public void setDebug(boolean debug)
      Sets the debugging flag.
      Parameters:
      debug - True to turn on debugging.

    • close

      public void close() throws IOException
      Closes this stream. Calls the TarBuffer's close() method.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Overrides:
      close in class FilterInputStream
      Throws:
      IOException - on error

    • 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 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. Integer.MAX_VALUE is returned in case more than Integer.MAX_VALUE bytes are left in the current entry in the archive.
      Overrides:
      available in class FilterInputStream
      Returns:
      The number of available bytes for the current entry.
      Throws:
      IOException - for signature

    • skip

      public long skip(long numToSkip) throws 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 FilterInputStream
      Parameters:
      numToSkip - The number of bytes to skip.
      Returns:
      the number actually skipped
      Throws:
      IOException - on error

    • markSupported

      public boolean markSupported()
      Since we do not support marking just yet, we return false.
      Overrides:
      markSupported in class FilterInputStream
      Returns:
      False.

    • mark

      public void mark(int markLimit)
      Since we do not support marking just yet, we do nothing.
      Overrides:
      mark in class 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 FilterInputStream

    • getNextEntry

      public TarEntry getNextEntry() throws 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:
      IOException - on error

    • getLongNameData

      protected byte[] getLongNameData() throws IOException
      Get the next entry in this tar archive as longname data.
      Returns:
      The next entry in the archive as longname data, or null.
      Throws:
      IOException - on error

    • read

      public int read() throws IOException
      Reads a byte from the current tar archive entry. This method simply calls read(byte[], int, int).
      Overrides:
      read in class FilterInputStream
      Returns:
      The byte read, or -1 at EOF.
      Throws:
      IOException - on error

    • read

      public int read(byte[] buf, int offset, int numToRead) throws 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 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:
      IOException - on error

    • copyEntryContents

      public void copyEntryContents(OutputStream out) throws 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:
      IOException - on error

    • canReadEntryData

      public boolean canReadEntryData(TarEntry te)
      Whether this class is able to read the given entry.

      May return false if the current entry is a sparse file.

      Parameters:
      te - TarEntry
      Returns:
      boolean