org.apache.tools.tar

Class TarUtils

public class TarUtils extends Object

This class provides static utility methods to work with byte streams.
Method Summary
static longcomputeCheckSum(byte[] buf)
Compute the checksum of a tar entry header.
static intgetCheckSumOctalBytes(long value, byte[] buf, int offset, int length)
Parse the checksum octal integer from a header buffer.
static intgetLongOctalBytes(long value, byte[] buf, int offset, int length)
Parse an octal long integer from a header buffer.
static intgetNameBytes(StringBuffer name, byte[] buf, int offset, int length)
Determine the number of bytes in an entry name.
static intgetOctalBytes(long value, byte[] buf, int offset, int length)
Parse an octal integer from a header buffer.
static StringBufferparseName(byte[] header, int offset, int length)
Parse an entry name from a header buffer.
static longparseOctal(byte[] header, int offset, int length)
Parse an octal string from a header buffer.

Method Detail

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.

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.

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.

getNameBytes

public static int getNameBytes(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.

parseName

public static 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.