crc16_qt.rb in digest-crc-0.6.0

- old
+ new
@@ -1,67 +1,10 @@
-require 'digest/crc16_ccitt'
+require 'digest/crc16_x_25'
 
 module Digest
   #
   # Implements the CRC16_CCITT algorithm used in QT algorithms.
   #
-  # @author Matthew Bednarski
+  # @note Is exactly the same as the CRC16 X-25 algorithm.
   #
-  class CRC16QT < CRC16CCITT
-
-    FINAL_XOR = 0xffff
-
-    #
-    # Updates the CRC16 checksum.
-    #
-    # @param [String] data
-    #   The data to update the checksum with.
-    #
-    def update(data)
-      data.each_byte do |b|
-        b = revert_byte(b)
-        @crc = ((@table[((@crc >> 8) ^ b) & 0xff] ^ (@crc << 8)) & 0xffff)
-      end
-
-      return self
-    end
-
-    #
-    # Calculates the CRC checksum value.
-    #
-    # @return [Integer]
-    #
-    def checksum
-      crc = super
-      crc ^= FINAL_XOR
-      crc = revert_bits(crc)
-      return crc
-    end
-
-    protected
-
-    def revert_bits(cc)
-      ob = 0
-      b  = (1 << 15)
-
-      16.times do |t|
-        ob |= (1 << t) if (cc & b) != 0
-        b >>= 1
-      end
-
-      return ob
-    end
-
-    def revert_byte(cc)
-      ob = 0
-      b  = (1 << 7)
-
-      8.times do |t|
-        ob |= (1 << t) if (cc & b) != 0
-        b >>= 1
-      end
-
-      return ob
-    end
-
-  end
+  CRC16QT = CRC16X25
 end