Class: Utel::Pdu

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

Class Method Summary collapse

Class Method Details

.decode(string) ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/utel/pdu.rb', line 17

def self.decode string
  out = ''
  b = 0; d = 0
  string.scan(/.{2}/).each do |part|
    byte = part.to_i(16)
    c = ((byte & ((1 << 7-d)-1)) << d) | b;
    b = byte >> (7-d);
    out << c.chr
    d += 1
    if d == 7
      out << b.chr
      d = 0; b = 0
    end
  end
  out
end

.encode(string) ⇒ Object

Encode and decode pdu strings



4
5
6
7
8
9
10
11
12
13
14
15
 
# File 'lib/utel/pdu.rb', line 4

def self.encode string
  out = ''
  for i in (0..string.length - 1) do
    t = i%8+1
    next if t == 8
    c = string[i] >> i%8
    b = (string[i+1] || 0) & ((1 << t)-1)
    c = (b << (8-t)) | c
    out << c.to_s(16).rjust(2, '0').upcase
  end
  out
end