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unzip-6.0/proginfo/extrafld.txt  view on Meta::CPAN

alignment).

All integer fields in the descriptions below are in little-endian (Intel)
format unless otherwise specified.  Note that "Short" means two bytes,
"Long" means four bytes, and "Long-Long" means eight bytes, regardless
of their native sizes.  Unless specifically noted, all integer fields should
be interpreted as unsigned (non-negative) numbers.

Christian Spieler, Ed Gordon, 20080717

                        -------------------------

          Header ID's of 0 thru 31 are reserved for use by PKWARE.
          The remaining ID's can be used by third party vendors for
          proprietary usage.

          The current Header ID mappings defined by PKWARE are:

          0x0001        Zip64 extended information extra field
          0x0007        AV Info
          0x0008        Reserved for extended language encoding data (PFS)
          0x0009        OS/2 extended attributes      (also Info-ZIP)
          0x000a        NTFS (Win9x/WinNT FileTimes)
          0x000c        OpenVMS                       (also Info-ZIP)
          0x000d        UNIX
          0x000e        Reserved for file stream and fork descriptors
          0x000f        Patch Descriptor
          0x0014        PKCS#7 Store for X.509 Certificates
          0x0015        X.509 Certificate ID and Signature for
                        individual file
          0x0016        X.509 Certificate ID for Central Directory
          0x0017        Strong Encryption Header
          0x0018        Record Management Controls
          0x0019        PKCS#7 Encryption Recipient Certificate List
          0x0065        IBM S/390 (Z390), AS/400 (I400) attributes
                        - uncompressed
          0x0066        Reserved for IBM S/390 (Z390), AS/400 (I400)
                        attributes - compressed
          0x4690        POSZIP 4690 (reserved)

          The Header ID mappings defined by Info-ZIP and third parties are:

          0x07c8        Info-ZIP Macintosh (old, J. Lee)
          0x2605        ZipIt Macintosh (first version)
          0x2705        ZipIt Macintosh v 1.3.5 and newer (w/o full filename)
          0x2805        ZipIt Macintosh 1.3.5+
          0x334d        Info-ZIP Macintosh (new, D. Haase's 'Mac3' field)
          0x4154        Tandem NSK
          0x4341        Acorn/SparkFS (David Pilling)
          0x4453        Windows NT security descriptor (binary ACL)
          0x4704        VM/CMS
          0x470f        MVS
          0x4854        Theos, old inofficial port
          0x4b46        FWKCS MD5 (see below)
          0x4c41        OS/2 access control list (text ACL)
          0x4d49        Info-ZIP OpenVMS (obsolete)
          0x4d63        Macintosh SmartZIP, by Macro Bambini
          0x4f4c        Xceed original location extra field
          0x5356        AOS/VS (binary ACL)
          0x5455        extended timestamp
          0x554e        Xceed unicode extra field
          0x5855        Info-ZIP UNIX (original; also OS/2, NT, etc.)
          0x6375        Info-ZIP UTF-8 comment field
          0x6542        BeOS (BeBox, PowerMac, etc.)
          0x6854        Theos
          0x7075        Info-ZIP UTF-8 name field
          0x7441        AtheOS (AtheOS/Syllable attributes)
          0x756e        ASi UNIX
          0x7855        Info-ZIP UNIX (16-bit UID/GID info)
          0x7875        Info-ZIP UNIX 3rd generation (generic UID/GID, ...)
          0xa220        Microsoft Open Packaging Growth Hint
          0xfb4a        SMS/QDOS

The following are detailed descriptions of the known extra-field block types:

         -Zip64 Extended Information Extra Field (0x0001):
          ===============================================

          The following is the layout of the zip64 extended
          information "extra" block. If one of the size or
          offset fields in the Local or Central directory
          record is too small to hold the required data,
          a zip64 extended information record is created.
          The order of the fields in the zip64 extended
          information record is fixed, but the fields will
          only appear if the corresponding Local or Central
          directory record field is set to 0xFFFF or 0xFFFFFFFF.

          Note: all fields stored in Intel low-byte/high-byte order.

          Value      Size       Description
          -----      ----       -----------
  (ZIP64) 0x0001     2 bytes    Tag for this "extra" block type
          Size       2 bytes    Size of this "extra" block
          Original
          Size       8 bytes    Original uncompressed file size
          Compressed
          Size       8 bytes    Size of compressed data
          Relative Header
          Offset     8 bytes    Offset of local header record
          Disk Start
          Number     4 bytes    Number of the disk on which
                                this file starts

          This entry in the Local header must include BOTH original
          and compressed file size fields.  If encrypting the
          central directory and bit 13 of the general purpose bit
          flag is set indicating masking, the value stored in the
          Local Header for the original file size will be zero.


         -OS/2 Extended Attributes Extra Field (0x0009):
          =============================================

          The following is the layout of the OS/2 extended attributes "extra"
          block.  (Last Revision 19960922)

          Note: all fields stored in Intel low-byte/high-byte order.

          Local-header version: