Class: String

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

Overview

overrides String.unpack to support MTP datatypes

Constant Summary collapse

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

Instance Method Summary collapse

Instance Method Details

#unicode ⇒ Object 



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# File 'lib/mtp.rb', line 162

def unicode
  @@iconv.iconv(self)
end

#unpack_with_mtp(format) ⇒ Object Also known as: unpack

J is a string, use + for an array O is an MTP code



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# File 'lib/mtp.rb', line 168

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

  while f = formats.shift
    next if f.empty?
    
    # check for array
    if f.match(/\*/)
      ary.concat(str.unpack_without_mtp(f))
    elsif f[0,1] == "K" and f[1,1] == "+"
      size, str = str.unpack_without_mtp("Va*")
      n = str.unpack_without_mtp("S#{size}a*")
      str = n.pop
      ary << n.map { |k| MTP::Datacode.new(k) }
    elsif f[0,1] == "K"
      n, str = str.unpack_without_mtp("Sa*")
      ary << MTP::Datacode.new(n)
    elsif f[0,1] == "Y"
      n1, n2, str = str.unpack_without_mtp("QQa*")
      ary << ((n2 << 32) + n1)
    elsif f[1,1] == '+'
      size, str = str.unpack_without_mtp("Va*")
      n = str.unpack_without_mtp("#{f[0,1]}#{size}a*")
      str = n.pop
      ary << n
    elsif f == "J"
      len = str.unpack_without_mtp("C").first.to_i * 2 
      len, string, str = str.unpack_without_mtp("Ca#{len}a*")
      if len > 0
        ary << string[0, string.length - 2].unicode
      else
        ary << ""
      end
    elsif f == "D"
      len = str.unpack_without_mtp("C").first.to_i * 2 
      len, string, str = str.unpack_without_mtp("Ca#{len}a*")
      if len > 0
        string = string[0, string.length - 2].unicode
        if string.match(/(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})(\d{2})?(\.(\d+))?$/)
          t = Time.xmlschema(string)
        end
      end
      ary << t
    else
      n = str.unpack_without_mtp("#{f}a*")
      str = n.pop
      ary.concat(n)
    end
  end
  ary
end