md51_array = function()

in packages/babel-plugin-standalone/src/SparkMD5.js [205:255]

• 34 lines of code
• 7 McCabe index (conditional complexity)

  md51_array = function (a) {
    var n = a.length,
      state = [1732584193, -271733879, -1732584194, 271733878],
      i,
      length,
      tail,
      tmp,
      lo,
      hi;

    for (i = 64; i <= n; i += 64) {
      md5cycle(state, md5blk_array(a.subarray(i - 64, i)));
    }

    // Not sure if it is a bug, however IE10 will
    // always produce a sub array of length 1
    // containing the last element of the parent
    // array if the sub array specified starts
    // beyond the length of the parent array - weird.
    // https://connect.microsoft.com/IE
    // /feedback/details/771452/typed-array-subarray-issue
    a = i - 64 < n ? a.subarray(i - 64) : new Uint8Array(0);

    length = a.length;
    tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    for (i = 0; i < length; i += 1) {
      tail[i >> 2] |= a[i] << (i % 4 << 3);
    }

    tail[i >> 2] |= 0x80 << (i % 4 << 3);
    if (i > 55) {
      md5cycle(state, tail);
      for (i = 0; i < 16; i += 1) {
        tail[i] = 0;
      }
    }

    // Beware that the final length might not fit
    // in 32 bits so we take care of that
    tmp = n * 8;
    tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
    lo = parseInt(tmp[2], 16);
    hi = parseInt(tmp[1], 16) || 0;

    tail[14] = lo;
    tail[15] = hi;

    md5cycle(state, tail);

    return state;
  },