Module: Tar

Defined in:
lib/tar.rb

Constant Summary collapse

Header = 
[
 ["name"    , 100],
 ["mode"    ,   8],
 ["uid"     ,   8],
 ["gid"     ,   8],
 ["size"    ,  12],
 ["mtime"   ,  12],
 ["chksum"  ,   8],
 ["typeflag",   1],
 ["linkname", 100],
 ["magic"   ,   6],
 ["version" ,   2],
 ["uname"   ,  32],
 ["gname"   ,  32],
 ["devmajor",   8],
 ["devminor",   8],
 ["prefix"  , 155]
]
TMAGIC = 
"ustar "
TVERSION = 
" "
REGTYPE = 
0
DIRTYPE = 
"5"

Class Method Summary collapse

Class Method Details

.cf(io, files) ⇒ Object 



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# File 'lib/tar.rb', line 30

def cf(io, files)
  lclose = false
  if String === io
    io = File.open(io,"wb")
    lclose = true
  elsif ! IO === io
    raise "the first argument must be IO or String"
  end
  begin
    files.each{|name|
      type = name[-1..-1] == "/" ? "d" : "f"
      if type == "f"
        size = File.stat(name).size
      else
        size = 0
      end
      io.write create_header(name, type, size)
      if type == "f"
        File.open(name,"rb"){|file|
          while (buf = file.read(512))
            io.write buf
            io.write "\000"*(512 - buf.length) unless buf.length == 512
          end
        }
      end
    }
    io.write "\000"*1024
  ensure
    io.close if lclose
  end
  return nil
end

.create_header(name, type, size) ⇒ Object 



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# File 'lib/tar.rb', line 83

def create_header(name, type, size)
  hash = Hash.new
  hash["name"] = name
  case type
  when "f"
    hash["mode"] = "0100644"
    hash["typeflag"] = "%i"%REGTYPE
  when "d"
    hash["mode"] = "0000755"
    hash["typeflag"] = "%i"%DIRTYPE
  end
  hash["uid"] = "0001000"
  hash["gid"] = "0001000"
  hash["size"] = "%0#11o"%size
  hash["mtime"] = ("%#o"%Time.now.to_i)[1..-1]
  hash["linkname"] = ""
  hash["magic"] = TMAGIC
  hash["version"] = TVERSION
  hash["uname"] = "gfdnavi"
  hash["gname"] = "gfdnavi"
  hash["devmajor"] = ""
  hash["devminor"] = ""
  hash["prefix"] = ""
  hash["chksum"] = " "*8
  chksum = 0
  hash.each{|n,v|
    v.each_byte{|byte| chksum +=  byte }
  }
  chksum = "%#o"%chksum
  len = chksum.size
  hash["chksum"][0...len] = chksum
  hash["chksum"][len..len] = "\000"

  header = ""
  Header.each{|ary|
    str = hash[ary[0]]
    str += "\000"*(ary[1]-str.length) if ary[1] > str.length
    header += str
  }
  header += "\000"*(512-header.length%512)
  return header
end

.zcf(io, files) ⇒ Object 



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# File 'lib/tar.rb', line 64

def zcf(io, files)
  if IO === io
    gz = Zlib::GzipWriter.new(io)
    lclose = false
  elsif String === io
    gz = Zlib::GzipWriter.open(io)
    lclose = true
  else
    raise "the first argument must be IO or String"
  end
  begin
    cf(gz, files)
  ensure
    lclose ? gz.close : gz.finish
  end
  return nil
end