1.1 --- a/clojure/com/aurellem/gb/util.clj	Thu Mar 22 20:10:09 2012 -0500
     1.2 +++ b/clojure/com/aurellem/gb/util.clj	Thu Mar 22 22:35:57 2012 -0500
     1.3 @@ -110,4 +110,34 @@
     1.4    (read-state "mid-game"))
     1.5  
     1.6  
     1.7 -  
     1.8 \ No newline at end of file
     1.9 +
    1.10 +(defn disect-bytes-2
    1.11 +  "return a vector consiting of the last 16 bytes of the
    1.12 +   integer expressed as two 8 bit nimbers (inside an integer)
    1.13 +   in the form [high-bits low-bits."
    1.14 +  [num]
    1.15 +  [(bit-shift-right
    1.16 +    (bit-and num 0xFF00) 8)
    1.17 +   (bit-and num 0xFF)])
    1.18 +
    1.19 +(defn disect-bytes-3
    1.20 +  "same as disect-bytes-2 except that it assumes the input is a
    1.21 +   24 bit number and returns [high-bits medium-bits low-bits]"
    1.22 +  [num]
    1.23 +  (vec
    1.24 +   (concat 
    1.25 +    [(bit-shift-right (bit-and num 0xFF0000) 16)]
    1.26 +    (disect-bytes-2 num))))
    1.27 +
    1.28 +(defn glue-bytes
    1.29 +  "Given two or three 8-bit numbers inside 32-bit integers,
    1.30 +   combine them into the integer number that they together
    1.31 +   represent."
    1.32 +  ([h l]
    1.33 +     (+ l (bit-shift-left h 8)))
    1.34 +
    1.35 +  ([h m l]
    1.36 +     (+ (glue-bytes m l)
    1.37 +        (bit-shift-left h 16))))
    1.38 +
    1.39 +