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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.

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:
    `name` - The header name from which to parse.
    `buf` - The 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 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:
    `value` - The header value
    `buf` - The 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 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:
    `value` - The header value
    `buf` - The 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 bytes.

### getCheckSumOctalBytes

    public static int getCheckSumOctalBytes(long value,
                                            byte[] buf,
                                            int offset,
                                            int length)

  Parse the checksum octal integer from a header buffer.

  Parameters:
    `value` - The header value
    `buf` - The 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 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.

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