Package org.apache.commons.compress.archivers.tar

Class TarUtils

  • public class TarUtils
extends java.lang.Object
    This class provides static utility methods to work with byte streams.
    Version:
    $Revision: 155439 $ $Date: 2008-07-05 20:15:52 -0400 (Sat, 05 Jul 2008) $
    Author:
    Timothy Gerard Endres, Stefano Mazzocchi

    • Constructor Summary

      Constructors 
      Constructor Description
      TarUtils()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static long computeCheckSum​(byte[] buffer)
      Compute the checksum of a tar entry header.
      static int getCheckSumOctalBytes​(long value, byte[] buf, int offset, int length)
      Parse the checksum octal integer from a header buffer.
      static int getLongOctalBytes​(long value, byte[] buf, int offset, int length)
      Parse an octal long integer from a header buffer.
      static int getNameBytes​(java.lang.StringBuffer name, byte[] buffer, int offset, int length)
      Determine the number of bytes in an entry name.
      static int getOctalBytes​(long value, byte[] buffer, int offset, int length)
      Parse an octal integer from a header buffer.
      static java.lang.StringBuffer parseName​(byte[] header, int offset, int length)
      Parse an entry name from a header buffer.
      static long parseOctal​(byte[] header, int offset, int length)
      Parse an octal string from a header buffer.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • TarUtils

        public TarUtils()

    • Method Detail

      • getCheckSumOctalBytes

        public static int getCheckSumOctalBytes​(long value,
                                        byte[] buf,
                                        int offset,
                                        int length)
        Parse the checksum octal integer from a header buffer.
        Parameters:
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        value - Description of Parameter
        buf - Description of Parameter
        Returns:
        The integer value of the entry's checksum.

      • getLongOctalBytes

        public static int getLongOctalBytes​(long value,
                                    byte[] buf,
                                    int offset,
                                    int length)
        Parse an octal long integer from a header buffer.
        Parameters:
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        value - Description of Parameter
        buf - Description of Parameter
        Returns:
        The long value of the octal bytes.

      • getNameBytes

        public static int getNameBytes​(java.lang.StringBuffer name,
                               byte[] buffer,
                               int offset,
                               int length)
        Determine the number of bytes in an entry name.
        Parameters:
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        name - Description of Parameter
        buffer - Description of Parameter
        Returns:
        The number of bytes in a header's entry name.

      • getOctalBytes

        public static int getOctalBytes​(long value,
                                byte[] buffer,
                                int offset,
                                int length)
        Parse an octal integer from a header buffer.
        Parameters:
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        Returns:
        The integer value of the octal bytes.

      • computeCheckSum

        public static long computeCheckSum​(byte[] buffer)
        Compute the checksum of a tar entry header.
        Parameters:
        buffer - The tar entry's header buffer.
        Returns:
        The computed checksum.

      • parseName

        public static java.lang.StringBuffer parseName​(byte[] header,
                                               int offset,
                                               int length)
        Parse an entry name from a header buffer.
        Parameters:
        header - The header buffer from which to parse.
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        Returns:
        The header's entry name.

      • parseOctal

        public static long parseOctal​(byte[] header,
                              int offset,
                              int length)
        Parse an octal string from a header buffer. This is used for the file permission mode value.
        Parameters:
        header - The header buffer from which to parse.
        offset - The offset into the buffer from which to parse.
        length - The number of header bytes to parse.
        Returns:
        The long value of the octal string.