(For Method 6 - Imploding)
Bit 1: If the compression method used was type 6,
Imploding, then this bit, if set, indicates
an 8K sliding dictionary was used. If clear,
then a 4K sliding dictionary was used.
Bit 2: If the compression method used was type 6,
Imploding, then this bit, if set, indicates
3 Shannon-Fano trees were used to encode the
sliding dictionary output. If clear, then 2
Shannon-Fano trees were used.

(For Methods 8 and 9 - Deflating)
Bit 2 Bit 1
0 0 Normal (-en) compression option was used.
0 1 Maximum (-exx/-ex) compression option was used.
1 0 Fast (-ef) compression option was used.
1 1 Super Fast (-es) compression option was used.

(For Method 14 - LZMA)
Bit 1: If the compression method used was type 14,
LZMA, then this bit, if set, indicates
an end-of-stream (EOS) marker is used to
mark the end of the compressed data stream.
If clear, then an EOS marker is not present
and the compressed data size must be known
to extract.

Note: Bits 1 and 2 are undefined if the compression
method is any other.

public int FLAG_COMPRESSION_PARAM0

public int FLAG_COMPRESSION_PARAM1

Bit 3: If this bit is set, the fields crc-32, compressed
size and uncompressed size are set to zero in the
local header. The correct values are put in the
data descriptor immediately following the compressed
data. (Note: PKZIP version 2.04g for DOS only
recognizes this bit for method 8 compression, newer
versions of PKZIP recognize this bit for any
compression method.)

public int FLAG_CRC32

Bit 5: If this bit is set, this indicates that the file is
compressed patched data. (Note: Requires PKZIP
version 2.70 or greater)

public int FLAG_COMPRESSED_PATCHED

Bit 6: Strong encryption. If this bit is set, you MUST
set the version needed to extract value to at least
50 and you MUST also set bit 0. If AES encryption
is used, the version needed to extract value MUST
be at least 51. See the section describing the Strong
Encryption Specification for details. Refer to the
section in this document entitled "Incorporating PKWARE
Proprietary Technology into Your Product" for more
information.

public int FLAG_ENCRYPTION

Bit 11: Language encoding flag (EFS). If this bit is set,
the filename and comment fields for this file
MUST be encoded using UTF-8. (see APPENDIX D)

public int FLAG_EFS

Bit 13: Set when encrypting the Central Directory to indicate
selected data values in the Local Header are masked to
hide their actual values. See the section describing
the Strong Encryption Specification for details. Refer
to the section in this document entitled "Incorporating
PKWARE Proprietary Technology into Your Product" for
more information.

public int FLAG_HIDE

0 - The file is stored (no compression) */

public int COMPRESSION_NONE

1 - The file is Shrunk */

public int COMPRESSION_SHRUNK

2 - The file is Reduced with compression factor 1 */

public int COMPRESSION_REDUCED_1

3 - The file is Reduced with compression factor 2 */

public int COMPRESSION_REDUCED_2

4 - The file is Reduced with compression factor 3 */

public int COMPRESSION_REDUCED_3

5 - The file is Reduced with compression factor 4 */