extra.fld

完整的解压zip文件的源码。包含密码功能

          The following is the layout of the ZipIt extra block for Macintosh.
          The local-header and central-header versions are identical.
          (Last Revision 19970130)

          Value         Size            Description
          -----         ----            -----------
  (Mac2)  0x2605        Short           tag for this extra block type
          TSize         Short           total data size for this block
          "ZPIT"        beLong          extra-field signature
          FnLen         Byte            length of FileName
          FileName      variable        full Macintosh filename
          FileType      Byte[4]         four-byte Mac file type string
          Creator       Byte[4]         four-byte Mac creator string


         -ZipIt Macintosh Extra Field (short):
          ===================================

          The following is the layout of a shortened variant of the
          ZipIt extra block for Macintosh (without "full name" entry).
          This variant is used by ZipIt 1.3.5 and newer for entries that
          do not need a "full Mac filename" record.
          The local-header and central-header versions are identical.
          (Last Revision 19980903)

          Value         Size            Description
          -----         ----            -----------
  (Mac2b) 0x2705        Short           tag for this extra block type
          TSize         Short           total data size for this block
          "ZPIT"        beLong          extra-field signature
          FileType      Byte[4]         four-byte Mac file type string
          Creator       Byte[4]         four-byte Mac creator string


         -Info-ZIP Macintosh Extra Field (new):
          ====================================

          The following is the layout of the (new) Info-ZIP extra
          block for Macintosh, designed by Dirk Haase.
          All values are in little-endian.
          (Last Revision 19981005)

          Local-header version:

          Value         Size            Description
          -----         ----            -----------
  (Mac3)  0x334d        Short           tag for this extra block type ("M3")
          TSize         Short           total data size for this block
          BSize         Long            uncompressed finder attribute data size
          Flags         Short           info bits
          fdType        Byte[4]         Type of the File (4-byte string)
          fdCreator     Byte[4]         Creator of the File (4-byte string)
          (CType)       Short           compression type
          (CRC)         Long            CRC value for uncompressed MacOS data
          Attribs       variable        finder attribute data (see below)


          Central-header version:

          Value         Size            Description
          -----         ----            -----------
  (Mac3)  0x334d        Short           tag for this extra block type ("M3")
          TSize         Short           total data size for this block
          BSize         Long            uncompressed finder attribute data size
          Flags         Short           info bits
          fdType        Byte[4]         Type of the File (4-byte string)
          fdCreator     Byte[4]         Creator of the File (4-byte string)

          The third bit of Flags in both headers indicates whether
          the LOCAL extra field is uncompressed (and therefore whether CType
          and CRC are omitted):

          Bits of the Flags:
              bit 0           if set, file is a data fork; otherwise unset
              bit 1           if set, filename will be not changed
              bit 2           if set, Attribs is uncompressed (no CType, CRC)
              bit 3           if set, date and times are in 64 bit
                              if zero date and times are in 32 bit.
              bit 4           if set, timezone offsets fields for the native
                              Mac times are omitted (UTC support deactivated)
              bits 5-15       reserved;


          Attributes:

          Attribs is a Mac-specific block of data in little-endian format with
          the following structure (if compressed, uncompress it first):

          Value         Size            Description
          -----         ----            -----------
          fdFlags       Short           Finder Flags
          fdLocation.v  Short           Finder Icon Location
          fdLocation.h  Short           Finder Icon Location
          fdFldr        Short           Folder containing file

          FXInfo        16 bytes        Macintosh FXInfo structure
            FXInfo-Structure:
                fdIconID        Short
                fdUnused[3]     Short       unused but reserved 6 bytes
                fdScript        Byte        Script flag and number
                fdXFlags        Byte        More flag bits
                fdComment       Short       Comment ID
                fdPutAway       Long        Home Dir ID

          FVersNum      Byte            file version number
                                        may be not used by MacOS
          ACUser        Byte            directory access rights

          FlCrDat       ULong           date and time of creation
          FlMdDat       ULong           date and time of last modification
          FlBkDat       ULong           date and time of last backup
            These time numbers are original Mac FileTime values (local time!).
            Currently, date-time width is 32-bit, but future version may
            support be 64-bit times (see flags)

          CrGMTOffs     Long(signed!)   difference "local Creat. time - UTC"
          MdGMTOffs     Long(signed!)   difference "local Modif. time - UTC"
          BkGMTOffs     Long(signed!)   difference "local Backup time - UTC"
            These "local time - UTC" differences (stored in seconds) may be
            used to support timestamp adjustment after inter-timezone transfer.
            These fields are optional; bit 4 of the flags word controls their
            presence.

          Charset       Short           TextEncodingBase (Charset)
                                        valid for the following two fields

          FullPath      variable        Path of the current file.
                                        Zero terminated string (C-String)
                                        Currently coded in the native Charset.

          Comment       variable        Finder Comment of the current file.
                                        Zero terminated string (C-String)
                                        Currently coded in the native Charset.


         -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
          TSize         Short           total data size for this block
          "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:
          ========================

          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
          specific data.  Currently the only values allowed are
          the original "linked to" file names for hard or symbolic links.

          The fixed part of this field has the same layout as Info-ZIP's
          abandoned "Unix1 timestamps & owner ID info" extra field;
          only the two tag bytes are different.


         -PATCH Descriptor Extra Field:
          ============================

          The following is the layout of the Patch Descriptor "extra"
          block.

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

          Value         Size            Description
          -----         ----            -----------
  (Patch) 0x000f        Short           Tag for this "extra" block type
          TSize         Short           Size of the total "extra" block
          Version       Short           Version of the descriptor
          Flags         Long            Actions and reactions (see below)
          OldSize       Long            Size of the file about to be patched
          OldCRC        Long            32-bit CRC of the file about to be patched
          NewSize       Long            Size of the resulting file
          NewCRC        Long            32-bit CRC of the resulting file


          Actions and reactions

          Bits          Description
          ----          ----------------
          0             Use for autodetection
          1             Treat as selfpatch
          2-3           RESERVED
          4-5           Action (see below)
          6-7           RESERVED
          8-9           Reaction (see below) to absent file
          10-11         Reaction (see below) to newer file
          12-13         Reaction (see below) to unknown file
          14-15         RESERVED
          16-31         RESERVED

          Actions

          Action       Value
          ------       -----
          none         0
          add          1
          delete       2
          patch        3

          Reactions

          Reaction     Value
          --------     -----
          ask          0
          skip         1
          ignore       2
          fail         3


         -Extended Timestamp Extra Field:
          ==============================

          The following is the layout of the extended-timestamp extra block.
          (Last Revision 19970118)

          Local-header version:

          Value         Size            Description
          -----         ----            -----------
  (time)  0x5455        Short           tag for this extra block type
          TSize         Short           total data size for this block
          Flags         Byte            info bits
          (ModTime)     Long            time of last modification (UTC/GMT)
          (AcTime)      Long            time of last access (UTC/GMT)
          (CrTime)      Long            time of original creation (UTC/GMT)

          Central-header version:

          Value         Size            Description
          -----         ----            -----------
  (time)  0x5455        Short           tag for this extra block type
          TSize         Short           total data size for this block
          Flags         Byte            info bits (refers to local header!)
          (ModTime)     Long            time of last modification (UTC/GMT)

          The central-header extra field contains the modification time only,