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

                                    Zero terminated string (C-String)
                                    Currently coded in the native Charset.


         -SmartZIP Macintosh Extra Field:
          ====================================

          The following is the layout of the SmartZIP extra
          block for Macintosh, designed by Marco Bambini.

          Local-header version:

          Value         Size        Description
          -----         ----        -----------
          0x4d63        Short       tag for this extra block type ("cM")
          TSize         Short       total data size for this block (64)
          "dZip"        beLong      extra-field signature
          fdType        Byte[4]     Type of the File (4-byte string)
          fdCreator     Byte[4]     Creator of the File (4-byte string)
          fdFlags       beShort     Finder Flags
          fdLocation.v  beShort     Finder Icon Location
          fdLocation.h  beShort     Finder Icon Location
          fdFldr        beShort     Folder containing file
          CrDat         beLong      HParamBlockRec fileParam.ioFlCrDat
          MdDat         beLong      HParamBlockRec fileParam.ioFlMdDat
          frScroll.v    Byte        vertical pos. of folder's scroll bar
          fdScript      Byte        Script flag and number
          frScroll.h    Byte        horizontal pos. of folder's scroll bar
          fdXFlags      Byte        More flag bits
          FileName      Byte[32]    full Macintosh filename (pascal string)

          All fields but the first two are in native Macintosh format
          (big-endian Motorola order, not little-endian Intel).
          The extra field size is fixed to 64 bytes.
          The local-header and central-header versions are identical.


         -Acorn SparkFS Extra Field:
          =========================

          The following is the layout of David Pilling's SparkFS extra block
          for Acorn RISC OS.  The local-header and central-header versions are
          identical.  (Last Revision 19960922)

          Value         Size        Description
          -----         ----        -----------
  (Acorn) 0x4341        Short       tag for this extra block type ("AC")
          TSize         Short       total data size for this block (20)
          "ARC0"        Long        extra-field signature
          LoadAddr      Long        load address or file type
          ExecAddr      Long        exec address
          Attr          Long        file permissions
          Zero          Long        reserved; always zero

          The following bits of Attr are associated with the given file
          permissions:

                bit 0           user-writable ('W')
                bit 1           user-readable ('R')
                bit 2           reserved
                bit 3           locked ('L')
                bit 4           publicly writable ('w')
                bit 5           publicly readable ('r')
                bit 6           reserved
                bit 7           reserved


         -VM/CMS Extra Field:
          ==================

          The following is the layout of the file-attributes extra block for
          VM/CMS.  The local-header and central-header versions are
          identical.  (Last Revision 19960922)

          Value         Size        Description
          -----         ----        -----------
 (VM/CMS) 0x4704        Short       tag for this extra block type
          TSize         Short       total data size for this block
          flData        variable    file attributes data

          flData is an uncompressed fldata_t struct.


         -MVS Extra Field:
          ===============

          The following is the layout of the file-attributes extra block for
          MVS.  The local-header and central-header versions are identical.
          (Last Revision 19960922)

          Value         Size        Description
          -----         ----        -----------
  (MVS)   0x470f        Short       tag for this extra block type
          TSize         Short       total data size for this block
          flData        variable    file attributes data

          flData is an uncompressed fldata_t struct.


         -PKWARE Unix Extra Field (0x000d):
          ================================

          The following is the layout of PKWARE's Unix "extra" block.
          It was introduced with the release of PKZIP for Unix 2.50.
          Note: all fields are stored in Intel low-byte/high-byte order.
          (Last Revision 19980901)

          This field has a minimum data size of 12 bytes and is only stored
          as local extra field.

          Value         Size        Description
          -----         ----        -----------
 (Unix0)  0x000d        Short       Tag for this "extra" block type
          TSize         Short       Total Data Size for this block
          AcTime        Long        time of last access (UTC/GMT)
          ModTime       Long        time of last modification (UTC/GMT)
          UID           Short       Unix user ID
          GID           Short       Unix group ID
          (var)         variable    Variable length data field

          The variable length data field will contain file type