Class: Simms::Bytes

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(byte_array) ⇒ Bytes

Returns a new instance of Bytes.



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# File 'lib/simms/bytes.rb', line 12

def initialize(byte_array)
  @data = byte_array
  @data = @data.to_s.scan(/../) unless @data.is_a?(Array)
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/simms/bytes.rb', line 10

def data
  @data
end

Instance Method Details

#[](*args) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 60

def [](*args)
  Bytes.new(@data[*args])
end

#bool(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 45

def bool(pos)
  @data[pos].hex == 1
end

#calc_checksum ⇒ Object 



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# File 'lib/simms/bytes.rb', line 64

def calc_checksum
  @data.inject(0) {|sum, byte| sum + byte.hex} % 0xFF
end

#count ⇒ Object 



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# File 'lib/simms/bytes.rb', line 17

def count
  @data.count
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/simms/bytes.rb', line 21

def empty?
  count == 0
end

#float(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 49

def float(pos)
  v = uint32(pos)
  x = (v & ((1 << 23) - 1)) + (1 << 23) * (v >> 31 | 1)
 exp = (v >> 23 & 0xFF) - 127
 return x.to_f * (2 ** (exp - 23))
end

#sint16(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 33

def sint16(pos)
  [@data[pos...pos+2].join].pack('H*').unpack('s').first
end

#sint32(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 41

def sint32(pos)
  [@data[pos...pos+4].join].pack('H*').unpack('l').first
end

#slice(*args) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 56

def slice(*args)
  Bytes.new(@data.slice(*args))
end

#to_s ⇒ Object 



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# File 'lib/simms/bytes.rb', line 68

def to_s
  @data.join('')
end

#uint16(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 29

def uint16(pos)
  @data[pos...pos+2].reverse.join('').hex
end

#uint32(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 37

def uint32(pos)
  @data[pos...pos+4].reverse.join('').hex
end

#uint8(pos) ⇒ Object 



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# File 'lib/simms/bytes.rb', line 25

def uint8(pos)
  @data[pos].hex
end