Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/mtp.rb

Overview

overrides Array.pack to support MTP datatypes

Constant Summary collapse

@@iconv = 
Iconv.new("UCS2", "UTF8")

Instance Method Summary collapse

Instance Method Details

#pack_with_mtp(format) ⇒ Object Also known as: pack 



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# File 'lib/mtp.rb', line 108

def pack_with_mtp(format)
  str, ary = "", self
  formats = format.split(/(K\+?|D|J|Y|\w\+)/)

  while f = formats.shift
    next if f.empty?
    
    # check for array
    if f.match(/\*/)
      str << ary.pack_without_mtp(f)
    elsif f[0,1] == "K" and f[1,1] == "+"
      str << ([ ary.first.size ] + ary.first).pack_without_mtp("VS*")
      ary.shift
    elsif f[0,1] == "K"
      str << ary.pack_without_mtp("S")
      ary.shift
    elsif f[0,1] == "Y"
      str << [ ary.first & 0xffffffffffffffff, ary[1] >> 32 ].pack_without_mtp("QQ")
      ary.shift
      ary.shift
    elsif f[1,1] == '+'
      str << ([ ary.first.size ] + ary.first).pack_without_mtp("V#{f[0,1]}*")
      ary.shift
    elsif f == "J"
      string = @@iconv.iconv(ary.first) + "\000\000"
      len = string.length / 2
      str << [ len, string ].pack_without_mtp("Ca*")
      ary.shift
    elsif f == "D"
      if ary.first.nil?
        string = "\000\000"
      else
        date = ary.first.xmlschema
        string = @@iconv.iconv(date) + "\000\000"
      end
      len = string.length / 2
      string = [ len, string ].pack_without_mtp("Ca*")
      str << [ len, string ].pack_without_mtp("Ca*")
      ary.shift
    else
      str << ary.pack_without_mtp("#{f}")
      (0...f.length).each { |i| ary.shift }
    end
  end
  str
end