package require XOTcl
    namespace import xotcl::*

    Class ZipArchive
    @ ::ZipArchive idemeta component ZipArchive
    ZipArchive instproc addFile {inputFile fileName} {
        # inputFile - source file to archive
        # fileName - name of file in the archive
        my lappend files $inputFile $fileName
    }
    ZipArchive instproc addToStream {stream fin fout} {
        my instvar written
    
        set offset $written
    
        set fdata [open $fin r]
        fconfigure $fdata -encoding binary -translation binary
        set data [read $fdata]
        set datacompresed [string range [::vfs::zip -mode compress $data] 2 end-4]
        close $fdata
    
        binary scan \x04\x03\x4B\x50 I LFH_SIG
        my writeLong $stream $LFH_SIG
        
        incr written 4
    
        my writeShort $stream 20
        # java implementation make 8
        # but tools (WinZip) leave it 0
        my writeShort $stream 0
        incr written 4
    
        my writeShort $stream 8
        incr written 2
    
        # last mod. time and date
        set dosTime [my toDosTime $fin]
    
        my writeLong $stream $dosTime
        incr written 4
    
        set crc [::vfs::crc $data]
        set csize [string length $datacompresed]
        set size [string length $data]
    
        my writeLong $stream $crc
        my writeLong $stream $csize
        my writeLong $stream $size
        incr written 12
    
        # file name length
        my writeShort $stream [string length $fout]
        incr written 2
    
        # extra field length
        set extra ""
        my writeShort $stream [string length $extra]
        incr written 2
    
        # file name
        puts -nonewline $stream $fout
        incr written [string length $fout]
    
        puts -nonewline $stream $extra
        incr written [string length $extra]
    
        set dataStart written;
        puts -nonewline $stream $datacompresed
        incr written $csize
    
        list $offset $dosTime $crc $csize $size
    }
    ZipArchive instproc createFile file {
        set fout [open $file w]
        fconfigure $fout -encoding binary -translation binary
        my createToStream $fout
        close $fout
    }
    ZipArchive instproc createToStream ostream {
        my instvar files cdOffset cdLength written
        set descriptionList [list]
        foreach {fin fout} $files {
            lappend descriptionList [my addToStream $ostream $fin $fout]
        }
        set cdOffset $written
    
        foreach {fin fout} $files desc $descriptionList {
            foreach {offset dosTime crc csize size} $desc {}
            my writeCentralFileHeader $ostream $fin $fout $offset $dosTime $size $csize $crc
        }
    
        set cdLength [expr {$written - $cdOffset}]
        # wirte header
    
        # EOCD 0X06054B50L scan 0X06054B50L %x s set s
        binary scan \x06\x05\x4B\x50 I EOCD
        my writeLong $ostream $EOCD
    
        # disk numbers
        my writeShort $ostream 0
        my writeShort $ostream 0
    
        # number of entries
        set filenum [expr {[llength $files]>>1}]
        my writeShort $ostream $filenum
        my writeShort $ostream $filenum
    
        # length and location of CD
        my writeLong $ostream $cdLength
        my writeLong $ostream $cdOffset
    
        # zip file comment
        set comment ""
        # comment lenght
        my writeShort $ostream [string bytelength $comment]
        
        puts -nonewline $ostream $comment
    }
    ZipArchive instproc init {} {
        my set files [list]
        package require vfslib
        my instvar cdLength cdOffset written
        set cdLength 0
        set cdOffset 0
        set written 0
    }
    ZipArchive instproc toDosTime file {
        set sec [file mtime $file]
    
        foreach {year month day hour minute secound} [clock format $sec -format "%Y %m %e %k %M %S"] {}

        set month [string trimleft $month 0]
        set year [string trimleft $year 0]
        if {$minute eq ""} {
            set minute 0
        }
       set secound [string trimleft $secound 0]
       if {$secound eq ""} {
           set secound 0
       }

        set value [expr (($year - 1980) << 25) | ($month << 21) | ($day << 16) | ($hour << 11) | ($minute << 5) | ($secound >> 1)]
        return $value
    }
    ZipArchive instproc writeCentralFileHeader {ostream fin fout offset dosTime size csize crc} {
        my instvar written
    
        # CFH 0X02014B50L
        binary scan \x02\x01\x4B\x50 I CFH_SIG
        my writeLong $ostream $CFH_SIG
        incr written 4
    
        if {$::tcl_platform(platform) eq "windows"} {
            # unix
            set pid 5
        } else {
            # windows
            set pid 11
        }
        my writeShort $ostream [expr { (($pid << 8) | 20)}]
        incr written 2
    
        # version needed to extract
        # general purpose bit flag
    
        my writeShort $ostream 20
        my writeShort $ostream 0
        incr written 4
    
        # compression method
        my writeShort $ostream 8
        incr written 2
    
        # last mod. time and date
        my writeLong $ostream $dosTime
        incr written 4
    
        # CRC
        # compressed length
        # uncompressed length
        my writeLong $ostream $crc
        my writeLong $ostream $csize
        my writeLong $ostream $size
        incr written 12;
    
        set comment ""
        set extra ""
    
        # file name length
    
        my writeShort $ostream [string bytelength $fout]
        incr written 2;
    
        # extra field length
        my writeShort $ostream [string bytelength $extra]
        incr written 2;
    
        # file comment length
        my writeShort $ostream [string bytelength $comment]
        incr written 2;
    
        # disk number start
        my writeShort $ostream 0
        incr written 2
    
        # internal file attributes
        my writeShort $ostream 0
        incr written 2
    
        # external file attributes
        my writeLong $ostream 0
        incr written 4
    
        # relative offset of LFH
        my writeLong $ostream $offset
        incr written 4
    
        # file name
        puts -nonewline $ostream $fout
        incr written [string bytelength $fout]
    
        # extra field
        puts -nonewline $ostream $extra
        incr written [string bytelength $extra]
    
        # file comment
        puts -nonewline $ostream $comment
        incr written [string bytelength $comment]
    }
    ZipArchive instproc writeLong {stream short} {
        puts -nonewline $stream [binary format i $short]
    }
    ZipArchive instproc writeShort {stream short} {
        puts -nonewline $stream [binary format s $short]
    }
    ZipArchive proc createZip {zipFile files} {
        set zipArch [my new]
        foreach f $files {
            $zipArch addFile $f [file tail $f]
        }
        $zipArch createFile $zipFile
        $zipArch destroy
    }
    ZipArchive proc testZip {} {
        my createZip {C:/tmp/my2.zip} {C:/tmp/test.txt C:/tmp/test2.txt C:/tmp/tmp.zip}
        # ZipArchive dumpFile {C:/tmp/my2.zip}
        # ZipArchive dumpFile {C:/tmp/tmp.zip}
    }

   set zipArch [ZipArchive new]
   foreach f $files {
      $zipArch addFile $f [file tail $f]
   }
   $zipArch createFile $zipFile
   $zipArch destroy

 # mkzip.tcl -- Copyright (C) 2009 Pat Thoyts <patthoyts@users.sourceforge.net>
 #
 #        Create ZIP archives in Tcl.
 #
 # Create a zipkit using mkzip filename.zkit -zipkit -directory xyz.vfs
 # or a zipfile using mkzip filename.zip -directory dirname -exclude "*~"
 #
 # version 1.2
 
 package require Tcl 8.6
 
 namespace eval zip {}
 
 # zip::timet_to_dos
 #
 #        Convert a unix timestamp into a DOS timestamp for ZIP times.
 #
 #   DOS timestamps are 32 bits split into bit regions as follows:
 #                  24                16                 8                 0
 #   +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
 #   |Y|Y|Y|Y|Y|Y|Y|m| |m|m|m|d|d|d|d|d| |h|h|h|h|h|m|m|m| |m|m|m|s|s|s|s|s|
 #   +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
 #
 proc zip::timet_to_dos {time_t} {
     set s [clock format $time_t -format {%Y %m %e %k %M %S}]
     scan $s {%d %d %d %d %d %d} year month day hour min sec
     expr {(($year-1980) << 25) | ($month << 21) | ($day << 16) 
           | ($hour << 11) | ($min << 5) | ($sec >> 1)}
 }
 
 # zip::pop --
 #
 #        Pop an element from a list
 #
 proc zip::pop {varname {nth 0}} {
     upvar $varname args
     set r [lindex $args $nth]
     set args [lreplace $args $nth $nth]
     return $r
 }
 
 # zip::walk --
 #
 #        Walk a directory tree rooted at 'path'. The excludes list can be
 #        a set of glob expressions to match against files and to avoid.
 #        The match arg is internal.
 #        eg: walk library {CVS/* *~ .#*} to exclude CVS and emacs cruft.
 #
proc zip::walk {base {excludes ""} {match *} {path {}}} {
     set result {}
     set imatch [file join $path $match]
     set files [glob -nocomplain -tails -types f -directory $base $imatch]
     foreach file $files {
         set excluded 0
         foreach glob $excludes {
             if {[string match $glob $file]} {
                 set excluded 1
                 break
             }
         }
         if {!$excluded} {lappend result $file}
     }
     foreach dir [glob -nocomplain -tails -types d -directory $base $imatch] {
         set subdir [walk $base $excludes $match $dir]
         if {[llength $subdir]>0} {
             set result [concat $result $dir $subdir]
         }
     }
     return $result
 }
 
 # zip::mkzipfile --
 #
 #        Add a single file to a zip archive. The zipchan channel should
 #        already be open and binary. You may provide a comment for the
 #        file The return value is the central directory record that
 #        will need to be used when finalizing the zip archive.
 #
 # FIX ME: should  handle the current offset for non-seekable channels
 #
 proc zip::mkzipfile {zipchan base path {comment ""}} {
     set fullpath [file join $base $path]
     set mtime [timet_to_dos [file mtime $fullpath]]
     set utfpath [encoding convertto utf-8 $path]
     set utfcomment [encoding convertto utf-8 $comment]
     set flags [expr {(1<<11)}] ;# utf-8 comment and path
     set method 0               ;# store 0, deflate 8
     set attr 0                 ;# text or binary (default binary)
     set version 20             ;# minumum version req'd to extract
     set extra ""
     set crc 0
     set size 0
     set csize 0
     set data ""
     set seekable [expr {[tell $zipchan] != -1}]
     if {[file isdirectory $fullpath]} {
         set attrex 0x41ff0010  ;# 0o040777 (drwxrwxrwx)
     } elseif {[file executable $fullpath]} {
         set attrex 0x81ff0080  ;# 0o100777 (-rwxrwxrwx)
     } else {
         set attrex 0x81b60020  ;# 0o100666 (-rw-rw-rw-)
         if {[file extension $fullpath] in {".tcl" ".txt" ".c"}} {
             set attr 1         ;# text
         }
     }
 
     if {[file isfile $fullpath]} {
         set size [file size $fullpath]
         if {!$seekable} {set flags [expr {$flags | (1 << 3)}]}
     }
 
     set offset [tell $zipchan]
     set local [binary format a4sssiiiiss PK\03\04 \
                    $version $flags $method $mtime $crc $csize $size \
                    [string length $utfpath] [string length $extra]]
     append local $utfpath $extra
     puts -nonewline $zipchan $local
 
     if {[file isfile $fullpath]} {
         # If the file is under 2MB then zip in one chunk, otherwize we use
         # streaming to avoid requiring excess memory. This helps to prevent
         # storing re-compressed data that may be larger than the source when
         # handling PNG or JPEG or nested ZIP files.
         if {$size < 0x00200000} {
             set fin [open $fullpath rb]
             set data [read $fin]
             set crc [zlib crc32 $data]
             set cdata [zlib deflate $data]
             if {[string length $cdata] < $size} {
                 set method 8
                 set data $cdata
             }
             close $fin
             set csize [string length $data]
             puts -nonewline $zipchan $data
         } else {
             set method 8
             set fin [open $fullpath rb]
             set zlib [zlib stream deflate]
             while {![eof $fin]} {
                 set data [read $fin 4096]
                 set crc [zlib crc32 $data $crc]
                 $zlib put $data
                 if {[string length [set zdata [$zlib get]]]} {
                     incr csize [string length $zdata]
                     puts -nonewline $zipchan $zdata
                 }
             }
             close $fin
             $zlib finalize
             set zdata [$zlib get]
             incr csize [string length $zdata]
             puts -nonewline $zipchan $zdata
             $zlib close
         }
     
         if {$seekable} {
             # update the header if the output is seekable
             set local [binary format a4sssiiii PK\03\04 \
                            $version $flags $method $mtime $crc $csize $size]
             set current [tell $zipchan]
             seek $zipchan $offset
             puts -nonewline $zipchan $local
             seek $zipchan $current
         } else {
             # Write a data descriptor record
             set ddesc [binary format a4iii PK\7\8 $crc $csize $size]
             puts -nonewline $zipchan $ddesc
         }
     }
 
     set hdr [binary format a4ssssiiiisssssii PK\01\02 0x0317 \
                  $version $flags $method $mtime $crc $csize $size \
                  [string length $utfpath] [string length $extra]\
                  [string length $utfcomment] 0 $attr $attrex $offset]
     append hdr $utfpath $extra $utfcomment
     return $hdr
 }
 
 # zip::mkzip --
 #
 #        Create a zip archive in 'filename'. If a file already exists it will be
 #        overwritten by a new file. If '-directory' is used, the new zip archive
 #        will be rooted in the provided directory.
 #        -runtime can be used to specify a prefix file. For instance, 
 #        zip myzip -runtime unzipsfx.exe -directory subdir
 #        will create a self-extracting zip archive from the subdir/ folder.
 #        The -comment parameter specifies an optional comment for the archive.
 #
 #        eg: zip my.zip -directory Subdir -runtime unzipsfx.exe *.txt
 # 
 proc zip::mkzip {filename args} {
     array set opts {
         -zipkit 0 -runtime "" -comment "" -directory ""
         -exclude {CVS/* */CVS/* *~ ".#*" "*/.#*"}
     }
     
     while {[string match -* [set option [lindex $args 0]]]} {
         switch -exact -- $option {
             -zipkit  { set opts(-zipkit) 1 }
             -comment { set opts(-comment) [encoding convertto utf-8 [pop args 1]] }
             -runtime { set opts(-runtime) [pop args 1] }
             -directory {set opts(-directory) [file normalize [pop args 1]] }
             -exclude {set opts(-exclude) [pop args 1] }
             -- { pop args ; break }
             default {
                 break
             }
         }
         pop args
     }
 
     set zf [open $filename wb]
     if {$opts(-runtime) ne ""} {
         set rt [open $opts(-runtime) rb]
         fcopy $rt $zf
         close $rt
     } elseif {$opts(-zipkit)} {
         set zkd "#!/usr/bin/env tclkit\n\# This is a zip-based Tcl Module\n"
         append zkd "package require vfs::zip\n"
         append zkd "vfs::zip::Mount \[info script\] \[info script\]\n"
         append zkd "if {\[file exists \[file join \[info script\] main.tcl\]\]} {\n"
         append zkd "    source \[file join \[info script\] main.tcl\]\n"
         append zkd "}\n"
         append zkd \x1A
         puts -nonewline $zf $zkd
     }

     set count 0
     set cd ""

     if {$opts(-directory) ne ""} {
         set paths [walk $opts(-directory) $opts(-exclude)]
     } else {
         set paths [glob -nocomplain {*}$args]
     }
     foreach path $paths {
         puts $path
         append cd [mkzipfile $zf $opts(-directory) $path]
         incr count
     }
     set cdoffset [tell $zf]
     set endrec [binary format a4ssssiis PK\05\06 0 0 \
                     $count $count [string length $cd] $cdoffset\
                     [string length $opts(-comment)]]
     append endrec $opts(-comment)
     puts -nonewline $zf $cd
     puts -nonewline $zf $endrec
     close $zf

     return
  }
     
 
 if {!$tcl_interactive} {
     set r [catch [linsert $argv 0 zip::mkzip] err]
     if {$r} {puts stderr $errorInfo} elseif {[string length $err]} {puts $err}
     exit $r
 }

• If directories have spaces in it, it will halt because it breaks down directory names at the white space and subsequently it can not find the directory. I could solve this by changing the line in proc "walk":

             set result [concat $result $dir $subdir]

to

             set result [concat $result [list $dir] $subdir]

• with or without this change: directories are treated as plain files (size 0) by winzip (8.1) and 7-zip (sub directories), so I could not extract directories;
  • jdc 29-sep-2010 To solve this, a / should be added to directory names:

    if {[file isdirectory $fullpath]} {
        append path /
    }
    set utfpath [encoding convertto utf-8 $path]

• I added "level" to the options and tested with level 9 on a few files (txt, jpg and doc) and found in each time for winzip a slightly better compression. Could this have to do with the 4096 chunks? In general: how does zlib stream work? Are all files compressed again if data is added taking all data into account? i.e. I would like to work without a data window, so that I could have maximum compression. Is that possible? (I know there will be a performance penalty for that.)
• After ending compressing a 650Mb folder, wish86 still allocates some 800Mb virtual memory, which almost brings my desktop to a hold (1Gb). Is this to expected because of virtual memory management or could this be a memory leak?

       set year [string trimleft $year 0]
       set month [string trimleft $month 0]
       set day [string trimleft $day 0]
       set hour [string trimleft $hour 0]
       if {$hour eq ""} { set hour 0 }
       set minute [string trimleft $minute 0]
       if {$minute eq ""} { set minute 0 }
       set secound [string trimleft $secound 0]
       if {$secound eq ""} { set secound 0 }

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