[ANN] Public release of JSON Action Manager 1.0

[jacobolus]

Oh, I thought I mentioned that. It’s Coffeescript, http://coffeescript.org/. Here’s the Javascript translation:

Code: Select all// Generated by CoffeeScript 1.3.1
var pow, read_float32, read_float64, read_int32, read_n_bytes, read_uint32;

pow = Math.pow;

read_float64 = (function() {
  var exp_offset, leftshift_32, rightshift_52, rightshift_exp_min;
  leftshift_32 = pow(2, 32);
  rightshift_52 = pow(2, -52);
  rightshift_exp_min = pow(2, -(0x400 - 2));
  exp_offset = -(0x400 - 1);
  return function(file) {
    var coef_high, coef_low, coefficient, exponent, high_bits, sign;
    high_bits = read_int32(file);
    sign = (high_bits >> 31) | 1;
    exponent = high_bits << 1 >>> 21;
    coef_high = high_bits & 0xfffff;
    coef_low = read_uint32(file);
    if (exponent === 0x7ff) {
      if (coef_high || coef_low) {
        return NaN;
      } else {
        return sign * Infinity;
      }
    } else if (!(exponent || coef_high || coef_low)) {
      return sign * 0;
    }
    coefficient = (coef_high * leftshift_32 + coef_low) * rightshift_52;
    if (!exponent) {
      return sign * coefficient * rightshift_exp_min;
    } else {
      return sign * (1 + coefficient) * (pow(2, exponent + exp_offset));
    }
  };
})();

read_float32 = (function() {
  var exp_offset, rightshift_23, rightshift_exp_min;
  rightshift_23 = pow(2, -23);
  rightshift_exp_min = pow(2, -(0x80 - 2));
  exp_offset = -(0x80 - 1);
  return function(file) {
    var bits, coefficient, exponent, sign;
    bits = read_int32(file);
    sign = (bits >> 31) | 1;
    exponent = bits << 1 >>> 24;
    coefficient = bits & 0x7fffff;
    if (exponent === 0xff) {
      if (coefficient) {
        return NaN;
      } else {
        return sign * Infinity;
      }
    } else if (!(exponent || coefficient)) {
      return sign * 0;
    }
    coefficient *= rightshift_23;
    if (!exponent) {
      return sign * coefficient * rightshift_exp_min;
    } else {
      return sign * (1 + coefficient) * (pow(2, exponent + exp_offset));
    }
  };
})();

read_n_bytes = function(file, n) {
  var bytes;
  bytes = file.read(n);
  if ((bytes != null ? bytes.length : void 0) !== n) {
    throw new Error("Can't read " + n + " byte(s) from the file");
  }
  return bytes;
};

read_int32 = function(file) {
  var bytes;
  bytes = read_n_bytes(file, 4);
  return ((bytes.charCodeAt(0)) << 24) + ((bytes.charCodeAt(1)) << 16) + ((bytes.charCodeAt(2)) << 8) + bytes.charCodeAt(3);
};

read_uint32 = function(file) {
  var int32;
  int32 = read_int32(file);
  if (int32 > 0) {
    return int32;
  } else {
    return int32 + 0x100000000;
  }
};

[jacobolus]

Another JavaScript float packing/unpacking library can be found here:
https://github.com/pgriess/node-jspack/ ... /jspack.js ... /jspack.js