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TarUtils (Apache Ant API)

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org.apache.tools.tar
Class TarUtils


java.lang.Object

  |

  +--org.apache.tools.tar.TarUtils

public class TarUtils
extends java.lang.Object

This class provides static utility methods to work with byte streams.

Author:: Timothy Gerard Endres time@ice.com

Constructor Summary

TarUtils()


Method Summary

static long computeCheckSum(byte[] buf)
          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[] buf, int offset, int length)
          Determine the number of bytes in an entry name.

static int getOctalBytes(long value, byte[] buf, 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

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.

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.

getNameBytes


public static int getNameBytes(java.lang.StringBuffer name,
                               byte[] buf,
                               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.
Returns:: The number of bytes in a header's entry name.

getOctalBytes


public static int getOctalBytes(long value,
                                byte[] buf,
                                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.

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.
Returns:: The long value of the octal bytes.

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.
Returns:: The integer value of the entry's checksum.

computeCheckSum


public static long computeCheckSum(byte[] buf)

Compute the checksum of a tar entry header.

Parameters:: buf - The tar entry's header buffer.
Returns:: The computed checksum.