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Filename : int64-buffer.js
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// int64-buffer.js

/*jshint -W018 */ // Confusing use of '!'.
/*jshint -W030 */ // Expected an assignment or function call and instead saw an expression.
/*jshint -W093 */ // Did you mean to return a conditional instead of an assignment?

var Uint64BE, Int64BE, Uint64LE, Int64LE;

!function(exports) {
  // constants

  var UNDEFINED = "undefined";
  var BUFFER = (UNDEFINED !== typeof Buffer) && Buffer;
  var UINT8ARRAY = (UNDEFINED !== typeof Uint8Array) && Uint8Array;
  var ARRAYBUFFER = (UNDEFINED !== typeof ArrayBuffer) && ArrayBuffer;
  var ZERO = [0, 0, 0, 0, 0, 0, 0, 0];
  var isArray = Array.isArray || _isArray;
  var BIT32 = 4294967296;
  var BIT24 = 16777216;

  // storage class

  var storage; // Array;

  // generate classes

  Uint64BE = factory("Uint64BE", true, true);
  Int64BE = factory("Int64BE", true, false);
  Uint64LE = factory("Uint64LE", false, true);
  Int64LE = factory("Int64LE", false, false);

  // class factory

  function factory(name, bigendian, unsigned) {
    var posH = bigendian ? 0 : 4;
    var posL = bigendian ? 4 : 0;
    var pos0 = bigendian ? 0 : 3;
    var pos1 = bigendian ? 1 : 2;
    var pos2 = bigendian ? 2 : 1;
    var pos3 = bigendian ? 3 : 0;
    var fromPositive = bigendian ? fromPositiveBE : fromPositiveLE;
    var fromNegative = bigendian ? fromNegativeBE : fromNegativeLE;
    var proto = Int64.prototype;
    var isName = "is" + name;
    var _isInt64 = "_" + isName;

    // properties
    proto.buffer = void 0;
    proto.offset = 0;
    proto[_isInt64] = true;

    // methods
    proto.toNumber = toNumber;
    proto.toString = toString;
    proto.toJSON = toNumber;
    proto.toArray = toArray;

    // add .toBuffer() method only when Buffer available
    if (BUFFER) proto.toBuffer = toBuffer;

    // add .toArrayBuffer() method only when Uint8Array available
    if (UINT8ARRAY) proto.toArrayBuffer = toArrayBuffer;

    // isUint64BE, isInt64BE
    Int64[isName] = isInt64;

    // CommonJS
    exports[name] = Int64;

    return Int64;

    // constructor
    function Int64(buffer, offset, value, raddix) {
      if (!(this instanceof Int64)) return new Int64(buffer, offset, value, raddix);
      return init(this, buffer, offset, value, raddix);
    }

    // isUint64BE, isInt64BE
    function isInt64(b) {
      return !!(b && b[_isInt64]);
    }

    // initializer
    function init(that, buffer, offset, value, raddix) {
      if (UINT8ARRAY && ARRAYBUFFER) {
        if (buffer instanceof ARRAYBUFFER) buffer = new UINT8ARRAY(buffer);
        if (value instanceof ARRAYBUFFER) value = new UINT8ARRAY(value);
      }

      // Int64BE() style
      if (!buffer && !offset && !value && !storage) {
        // shortcut to initialize with zero
        that.buffer = newArray(ZERO, 0);
        return;
      }

      // Int64BE(value, raddix) style
      if (!isValidBuffer(buffer, offset)) {
        var _storage = storage || Array;
        raddix = offset;
        value = buffer;
        offset = 0;
        buffer = new _storage(8);
      }

      that.buffer = buffer;
      that.offset = offset |= 0;

      // Int64BE(buffer, offset) style
      if (UNDEFINED === typeof value) return;

      // Int64BE(buffer, offset, value, raddix) style
      if ("string" === typeof value) {
        fromString(buffer, offset, value, raddix || 10);
      } else if (isValidBuffer(value, raddix)) {
        fromArray(buffer, offset, value, raddix);
      } else if ("number" === typeof raddix) {
        writeInt32(buffer, offset + posH, value); // high
        writeInt32(buffer, offset + posL, raddix); // low
      } else if (value > 0) {
        fromPositive(buffer, offset, value); // positive
      } else if (value < 0) {
        fromNegative(buffer, offset, value); // negative
      } else {
        fromArray(buffer, offset, ZERO, 0); // zero, NaN and others
      }
    }

    function fromString(buffer, offset, str, raddix) {
      var pos = 0;
      var len = str.length;
      var high = 0;
      var low = 0;
      if (str[0] === "-") pos++;
      var sign = pos;
      while (pos < len) {
        var chr = parseInt(str[pos++], raddix);
        if (!(chr >= 0)) break; // NaN
        low = low * raddix + chr;
        high = high * raddix + Math.floor(low / BIT32);
        low %= BIT32;
      }
      if (sign) {
        high = ~high;
        if (low) {
          low = BIT32 - low;
        } else {
          high++;
        }
      }
      writeInt32(buffer, offset + posH, high);
      writeInt32(buffer, offset + posL, low);
    }

    function toNumber() {
      var buffer = this.buffer;
      var offset = this.offset;
      var high = readInt32(buffer, offset + posH);
      var low = readInt32(buffer, offset + posL);
      if (!unsigned) high |= 0; // a trick to get signed
      return high ? (high * BIT32 + low) : low;
    }

    function toString(radix) {
      var buffer = this.buffer;
      var offset = this.offset;
      var high = readInt32(buffer, offset + posH);
      var low = readInt32(buffer, offset + posL);
      var str = "";
      var sign = !unsigned && (high & 0x80000000);
      if (sign) {
        high = ~high;
        low = BIT32 - low;
      }
      radix = radix || 10;
      while (1) {
        var mod = (high % radix) * BIT32 + low;
        high = Math.floor(high / radix);
        low = Math.floor(mod / radix);
        str = (mod % radix).toString(radix) + str;
        if (!high && !low) break;
      }
      if (sign) {
        str = "-" + str;
      }
      return str;
    }

    function writeInt32(buffer, offset, value) {
      buffer[offset + pos3] = value & 255;
      value = value >> 8;
      buffer[offset + pos2] = value & 255;
      value = value >> 8;
      buffer[offset + pos1] = value & 255;
      value = value >> 8;
      buffer[offset + pos0] = value & 255;
    }

    function readInt32(buffer, offset) {
      return (buffer[offset + pos0] * BIT24) +
        (buffer[offset + pos1] << 16) +
        (buffer[offset + pos2] << 8) +
        buffer[offset + pos3];
    }
  }

  function toArray(raw) {
    var buffer = this.buffer;
    var offset = this.offset;
    storage = null; // Array
    if (raw !== false && offset === 0 && buffer.length === 8 && isArray(buffer)) return buffer;
    return newArray(buffer, offset);
  }

  function toBuffer(raw) {
    var buffer = this.buffer;
    var offset = this.offset;
    storage = BUFFER;
    if (raw !== false && offset === 0 && buffer.length === 8 && Buffer.isBuffer(buffer)) return buffer;
    var dest = new BUFFER(8);
    fromArray(dest, 0, buffer, offset);
    return dest;
  }

  function toArrayBuffer(raw) {
    var buffer = this.buffer;
    var offset = this.offset;
    var arrbuf = buffer.buffer;
    storage = UINT8ARRAY;
    if (raw !== false && offset === 0 && (arrbuf instanceof ARRAYBUFFER) && arrbuf.byteLength === 8) return arrbuf;
    var dest = new UINT8ARRAY(8);
    fromArray(dest, 0, buffer, offset);
    return dest.buffer;
  }

  function isValidBuffer(buffer, offset) {
    var len = buffer && buffer.length;
    offset |= 0;
    return len && (offset + 8 <= len) && ("string" !== typeof buffer[offset]);
  }

  function fromArray(destbuf, destoff, srcbuf, srcoff) {
    destoff |= 0;
    srcoff |= 0;
    for (var i = 0; i < 8; i++) {
      destbuf[destoff++] = srcbuf[srcoff++] & 255;
    }
  }

  function newArray(buffer, offset) {
    return Array.prototype.slice.call(buffer, offset, offset + 8);
  }

  function fromPositiveBE(buffer, offset, value) {
    var pos = offset + 8;
    while (pos > offset) {
      buffer[--pos] = value & 255;
      value /= 256;
    }
  }

  function fromNegativeBE(buffer, offset, value) {
    var pos = offset + 8;
    value++;
    while (pos > offset) {
      buffer[--pos] = ((-value) & 255) ^ 255;
      value /= 256;
    }
  }

  function fromPositiveLE(buffer, offset, value) {
    var end = offset + 8;
    while (offset < end) {
      buffer[offset++] = value & 255;
      value /= 256;
    }
  }

  function fromNegativeLE(buffer, offset, value) {
    var end = offset + 8;
    value++;
    while (offset < end) {
      buffer[offset++] = ((-value) & 255) ^ 255;
      value /= 256;
    }
  }

  // https://github.com/retrofox/is-array
  function _isArray(val) {
    return !!val && "[object Array]" == Object.prototype.toString.call(val);
  }

}(typeof exports === 'object' && typeof exports.nodeName !== 'string' ? exports : (this || {}));