Module: Memcached::PackArray

Defined in:
lib/remcached/pack_array.rb

Overview

Works exactly like Array#pack and String#unpack, except that it inverts ‘q’ & ‘Q’ prior packing/after unpacking. This is done to achieve network byte order for these values on a little-endian machine.

FIXME: implement check for big-endian machines.

Class Method Summary collapse

Class Method Details

.pack(ary, fmt1) ⇒ Object 



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# File 'lib/remcached/pack_array.rb', line 8

def self.pack(ary, fmt1)
  fmt2 = ''
  values = []
  fmt1.each_char do |c|
    if c == 'Q' || c == 'q'
      fmt2 += 'a8'
      values << [ary.shift].pack(c).reverse
    else
      fmt2 += c
      values << ary.shift
    end
  end

  values.pack(fmt2)
end

.unpack(buf, fmt1) ⇒ Object 



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# File 'lib/remcached/pack_array.rb', line 24

def self.unpack(buf, fmt1)
  fmt2 = ''
  reverse = []
  i = 0
  fmt1.each_char do |c|
    if c == 'Q' || c == 'q'
      fmt2 += 'a8'
      reverse << [i, c]
    else
      fmt2 += c
    end
    i += 1
  end

  ary = buf.unpack(fmt2)

  reverse.each do |i, c|
    ary[i], = ary[i].reverse.unpack(c)
  end

  ary
end