Class: Array

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

Instance Method Summary collapse

Instance Method Details

#append_crc16 ⇒ Object 



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# File 'lib/core_ext.rb', line 36

def append_crc16
  append_uint(crc16, 2)
end

#append_sint(number, byte) ⇒ Object 



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# File 'lib/core_ext.rb', line 22

def append_sint(number, byte)
  raise 'Insufficient bytes' if number.abs >= (1 << (byte * 8))

  sign = (number < 0) ? 1 : 0
  number &= (1 << ((byte * 8) - 1)) - 1
  self.append_uint(number, byte)
  self << (self.pop | (sign << 7))
end

#append_uint(number, byte) ⇒ Object 



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# File 'lib/core_ext.rb', line 2

def append_uint(number, byte)
  raise 'Only support unsigned integer' if number < 0
  raise 'Insufficient bytes' if number.abs >= (1 << (byte * 8))

  until byte == 0
    self << (number & 0xFF)
    number >>= 8
    byte -= 1
  end
  self
end

#check_crc16(remove_after_check = false) ⇒ Object 



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# File 'lib/core_ext.rb', line 40

def check_crc16(remove_after_check = false)
  orig_crc = pop(2)
  old_crc = (orig_crc[1] << 8) + orig_crc[0]
  new_crc = crc16
  concat(orig_crc) unless remove_after_check
  old_crc == new_crc
end

#to_bytehex ⇒ Object 



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# File 'lib/core_ext.rb', line 52

def to_bytehex
  map{|x| x.to_bytehex}
end

#to_sint ⇒ Object 



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# File 'lib/core_ext.rb', line 31

def to_sint
  sign = (self.last & 0x80 != 0) ? (-1 ^ ((1 << ((self.size * 8) - 1)) - 1)) : 0
  sign | self.to_uint
end

#to_uint ⇒ Object 



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# File 'lib/core_ext.rb', line 14

def to_uint
  int = 0
  self.each_with_index do |byte, index|
    int |= (byte << (index * 8))
  end
  int
end

#xor(array2) ⇒ Object 



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# File 'lib/core_ext.rb', line 48

def xor(array2)
  zip(array2).map{|x, y| x ^ y }
end