crc()

jazz-mxml.js

@@ -171,5 +171,49 @@ function find(n, f) {
     else if (typeof x == 'object') f(x);
   };
 }
+var T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, Ta, Tb, Tc, Td, Te, Tf;
+(function() {
+  var c, v, n;
+  var A = [], TT = [];
+  T0 = [];
+  for (n = 0; n < 256; n++) {
+    c = n;
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    c = ((c&1) ? (-306674912 ^ (c >>> 1)) : (c >>> 1));
+    T0[n] = c;
+  }
+  for (n = 0; n != 256; n++) A[n] = T0[n];
+  for (n = 0; n != 256; n++) {
+    v = T0[n];
+    for (c = 256 + n; c < 4096; c += 256) v = A[c] = (v >>> 8) ^ T0[v & 0xFF];
+  }
+  for (n = 1; n != 16; n++) TT[n - 1] = A.slice(n * 256, n * 256 + 256);
+  T1 = TT[0];  T2 = TT[1];  T3 = TT[2];  T4 = TT[3];  T5 = TT[4];
+  T6 = TT[5];  T7 = TT[6];  T8 = TT[7];  T9 = TT[8];  Ta = TT[9];
+  Tb = TT[10]; Tc = TT[11]; Td = TT[12]; Te = TT[13]; Tf = TT[14];
+})();
+function crc(B) {
+  var C = -1;
+  var L = B.length - 15;
+  var i;
+  for(i = 0; i < L;) {
+    C = Tf[B[i++] ^ (C & 255)] ^
+    Te[B[i++] ^ ((C >> 8) & 255)] ^
+    Td[B[i++] ^ ((C >> 16) & 255)] ^
+    Tc[B[i++] ^ (C >>> 24)] ^
+    Tb[B[i++]] ^ Ta[B[i++]] ^ T9[B[i++]] ^ T8[B[i++]] ^
+    T7[B[i++]] ^ T6[B[i++]] ^ T5[B[i++]] ^ T4[B[i++]] ^
+    T3[B[i++]] ^ T2[B[i++]] ^ T1[B[i++]] ^ T0[B[i++]];
+  }
+  L += 15;
+  while (i < L) C = (C >>> 8) ^ T0[(C ^ B[i++]) & 0xFF];
+  return ~C;
+}
 
 module.exports = MXML;