zipinfo.doc

完整的解压zip文件的源码。包含密码功能

ZIPINFO(1L)                                           ZIPINFO(1L)

NAME
       zipinfo - list detailed information about a ZIP archive

SYNOPSIS
       zipinfo     [-12smlvhMtTz]     file[.zip]    [file(s) ...]
       [-x xfile(s) ...]

       unzip   -Z   [-12smlvhMtTz]    file[.zip]    [file(s) ...]
       [-x xfile(s) ...]

DESCRIPTION
       zipinfo  lists  technical information about files in a ZIP
       archive, most commonly  found  on  MS-DOS  systems.   Such
       information  includes  file access permissions, encryption
       status, type of compression, version and operating  system
       or  file system of compressing program, and the like.  The
       default behavior (with no options) is to list  single-line
       entries  for  each  file  in  the archive, with header and
       trailer lines providing summary information for the entire
       archive.  The format is a cross between Unix ``ls -l'' and
       ``unzip -v''  output.   See  DETAILED  DESCRIPTION  below.
       Note  that  zipinfo  is  the  same program as unzip (under
       Unix, a link to it); on  some  systems,  however,  zipinfo
       support may have been omitted when unzip was compiled.

ARGUMENTS
       file[.zip]
              Path of the ZIP archive(s).  If the file specifica-
              tion is a wildcard, each matching file is processed
              in  an order determined by the operating system (or
              file system).  Only the filename can be a wildcard;
              the  path  itself cannot.  Wildcard expressions are
              similar to Unix egrep(1) (regular) expressions  and
              may contain:

              *      matches a sequence of 0 or more characters

              ?      matches exactly 1 character

              [...]  matches  any  single  character found inside
                     the brackets;  ranges  are  specified  by  a
                     beginning character, a hyphen, and an ending
                     character.  If an  exclamation  point  or  a
                     caret (`!' or `^') follows the left bracket,
                     then the  range  of  characters  within  the
                     brackets  is complemented (that is, anything
                     except the characters inside the brackets is
                     considered a match).

              (Be  sure  to quote any character that might other-
              wise be interpreted or modified  by  the  operating
              system,  particularly  under  Unix and VMS.)  If no
              matches are found, the specification is assumed  to
              be  a literal filename; and if that also fails, the

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ZIPINFO(1L)                                           ZIPINFO(1L)

              suffix .zip is appended.  Note that self-extracting
              ZIP files are supported; just specify the .exe suf-
              fix (if any) explicitly.

       [file(s)]
              An optional list of  archive  members  to  be  pro-
              cessed.   Regular  expressions  (wildcards)  may be
              used to match multiple members; see above.   Again,
              be  sure  to quote expressions that would otherwise
              be expanded or modified by the operating system.

       [-x xfile(s)]
              An optional list of archive members to be  excluded
              from processing.

OPTIONS
       -1     list  filenames  only,  one  per line.  This option
              excludes all others; headers, trailers and  zipfile
              comments are never printed.  It is intended for use
              in Unix shell scripts.

       -2     list filenames only, one per line, but allow  head-
              ers  (-h), trailers (-t) and zipfile comments (-z),
              as well.  This option may be useful in cases  where
              the stored filenames are particularly long.

       -s     list  zipfile  info in short Unix ``ls -l'' format.
              This is the default behavior; see below.

       -m     list zipfile info in medium Unix ``ls -l''  format.
              Identical  to  the  -s output, except that the com-
              pression factor, expressed as a percentage, is also
              listed.

       -l     list  zipfile  info  in long Unix ``ls -l'' format.
              As with -m except  that  the  compressed  size  (in
              bytes) is printed instead of the compression ratio.

       -v     list zipfile  information  in  verbose,  multi-page
              format.

       -h     list  header  line.   The archive name, actual size
              (in bytes) and total number of files is printed.

       -M     pipe all output through an internal  pager  similar
              to  the  Unix  more(1)  command.   At  the end of a
              screenful  of  output,  zipinfo   pauses   with   a
              ``--More--''  prompt;  the  next  screenful  may be
              viewed by pressing the Enter (Return)  key  or  the
              space  bar.   zipinfo can be terminated by pressing
              the  ``q''  key   and,   on   some   systems,   the
              Enter/Return key.  Unlike Unix more(1), there is no
              forward-searching  or  editing  capability.   Also,
              zipinfo  doesn't  notice  if long lines wrap at the

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ZIPINFO(1L)                                           ZIPINFO(1L)

              edge of the screen, effectively  resulting  in  the
              printing  of  two  or more lines and the likelihood
              that some text will  scroll  off  the  top  of  the
              screen  before  being  viewed.  On some systems the
              number of available lines  on  the  screen  is  not
              detected,  in which case zipinfo assumes the height
              is 24 lines.

       -t     list totals for files listed or for all files.  The
              number of files listed, their uncompressed and com-
              pressed total sizes, and their overall  compression
              factor  is  printed; or, if only the totals line is
              being printed, the values for  the  entire  archive
              are  given.   Note that the total compressed (data)
              size will never  match  the  actual  zipfile  size,
              since  the latter includes all of the internal zip-
              file headers in addition to the compressed data.

       -T     print the file dates and times in a sortable  deci-
              mal  format (yymmdd.hhmmss).  The default date for-
              mat is a more standard, human-readable version with
              abbreviated month names (see examples below).

       -z     include  the  archive comment (if any) in the list-
              ing.

DETAILED DESCRIPTION
       zipinfo has a number of modes, and  its  behavior  can  be
       rather difficult to fathom if one isn't familiar with Unix
       ls(1) (or even if one is).  The  default  behavior  is  to
       list files in the following format:

  -rw-rws---  1.9 unx    2802 t- defX 11-Aug-91 13:48 perms.2660

       The  last  three fields are the modification date and time
       of the file, and its name.  The case of  the  filename  is
       respected;  thus  files  that  come  from MS-DOS PKZIP are
       always capitalized.  If the file was zipped with a  stored
       directory  name,  that  is  also  displayed as part of the
       filename.

       The second and third fields indicate  that  the  file  was
       zipped under Unix with version 1.9 of zip.  Since it comes
       from Unix, the file permissions at the  beginning  of  the
       line  are  printed in Unix format.  The uncompressed file-
       size (2802 in this example) is the fourth field.

       The fifth field consists  of  two  characters,  either  of
       which may take on several values.  The first character may
       be either `t' or `b', indicating  that  zip  believes  the
       file  to  be text or binary, respectively; but if the file
       is encrypted, zipinfo notes this fact by capitalizing  the
       character  (`T'  or  `B').   The second character may also
       take on four values, depending  on  whether  there  is  an

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ZIPINFO(1L)                                           ZIPINFO(1L)

       extended local header and/or an ``extra field'' associated
       with the file (fully explained  in  PKWare's  APPNOTE.TXT,
       but  basically  analogous to pragmas in ANSI C--i.e., they
       provide a standard way to include non-standard information
       in the archive).  If neither exists, the character will be
       a hyphen (`-'); if there is an extended local  header  but
       no  extra  field,  `l';  if  the reverse, `x'; and if both
       exist, `X'.  Thus the file in this example is (probably) a
       text  file,  is  not  encrypted,  and has neither an extra
       field nor an extended local  header  associated  with  it.
       The  example  below,  on  the  other hand, is an encrypted
       binary file with an extra field:

  RWD,R,R     0.9 vms     168 Bx shrk  9-Aug-91 19:15 perms.0644

       Extra fields are used for various purposes (see discussion
       of  the -v option below) including the storage of VMS file
       attributes, which is presumably the case here.  Note  that
       the  file attributes are listed in VMS format.  Some other
       possibilities for the  host  operating  system  (which  is
       actually  a  misnomer--host  file  system is more correct)
       include OS/2 or  NT  with  High  Performance  File  System
       (HPFS),  MS-DOS,  OS/2  or  NT  with File Allocation Table
       (FAT) file system, and Macintosh.  These  are  denoted  as
       follows:

  -rw-a--     1.0 hpf    5358 Tl i4:3  4-Dec-91 11:33 longfilename.hpfs
  -r--ahs     1.1 fat    4096 b- i4:2 14-Jul-91 12:58 EA DATA. SF
  --w-------  1.0 mac   17357 bx i8:2  4-May-92 04:02 unzip.macr

       File  attributes in the first two cases are indicated in a
       Unix-like  format,  where  the  seven  subfields  indicate
       whether  the  file:   (1)  is a directory, (2) is readable
       (always true), (3) is writable, (4) is executable (guessed
       on  the basis of the extension--.exe, .com, .bat, .cmd and
       .btm files are assumed to be so), (5) has its archive  bit
       set, (6) is hidden, and (7) is a system file.  Interpreta-
       tion of Macintosh file attributes  is  unreliable  because
       some Macintosh archivers don't store any attributes in the
       archive.

       Finally, the sixth field indicates the compression  method
       and possible sub-method used.  There are six methods known
       at present:  storing (no compression),  reducing,  shrink-
       ing,  imploding, tokenizing (never publicly released), and
       deflating.  In addition, there are four levels of reducing
       (1  through  4); four types of imploding (4K or 8K sliding
       dictionary, and 2 or 3 Shannon-Fano trees); and four  lev-
       els  of  deflating  (superfast, fast, normal, maximum com-
       pression).  zipinfo represents  these  methods  and  their
       sub-methods  as  follows:   stor;  re:1, re:2, etc.; shrk;
       i4:2, i8:3, etc.; tokn; and defS, defF, defN, and defX.

       The medium and long listings are almost identical  to  the

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ZIPINFO(1L)                                           ZIPINFO(1L)

       short  format  except  that  they  add  information on the
       file's compression.  The medium format  lists  the  file's
       compression  factor  as a percentage indicating the amount
       of space that has been ``removed'':

  -rw-rws---  1.5 unx    2802 t- 81% defX 11-Aug-91 13:48 perms.2660

       In this example, the file has been compressed by more than
       a  factor of five; the compressed data are only 19% of the
       original size.   The  long  format  gives  the  compressed
       file's size in bytes, instead:

  -rw-rws---  1.5 unx    2802 t-     538 defX 11-Aug-91 13:48 perms.2660