(function () {
'use strict';

function utf8ToBinaryString(str) {
  var escstr = encodeURIComponent(str);
  // replaces any uri escape sequence, such as %0A,
  // with binary escape, such as 0x0A
  var binstr = escstr.replace(/%([0-9A-F]{2})/g, function(match, p1) {
    return String.fromCharCode('0x' + p1);
  });

  return binstr;
}

function utf8ToBuffer(str) {
  var binstr = utf8ToBinaryString(str);
  var buf = binaryStringToBuffer(binstr);
  return buf;
}

function utf8ToBase64(str) {
  var binstr = utf8ToBinaryString(str);
  return btoa(binstr);
}

function binaryStringToUtf8(binstr) {
  var escstr = binstr.replace(/(.)/g, function (m, p) {
    var code = p.charCodeAt(p).toString(16).toUpperCase();
    if (code.length < 2) {
      code = '0' + code;
    }
    return '%' + code;
  });

  return decodeURIComponent(escstr);
}

function bufferToUtf8(buf) {
  var binstr = Array.prototype.map.call(buf, function (ch) {
    return '0x' + String.fromCharCode(ch);
  }).join('');

  return binaryStringToUtf8(binstr);
}

function base64ToUtf8(b64) {
  var binstr = atob(b64);

  return binaryStringToUtf8(binstr);
}

function bufferToBinaryString(buf) {
  var binstr = Array.prototype.map.call(buf, function (ch) {
    return '0x' + String.fromCharCode(ch);
  }).join('');

  return binstr;
}

function bufferToBase64(arr) {
  var binstr = bufferToBinaryString(arr);
  return btoa(binstr);
}

function binaryStringToBuffer(binstr) {
  var buf;

  if ('undefined' === typeof Uint8Array) {
    buf = new Uint8Array(binstr.length);
  } else {
    buf = [];
  }

  Array.prototype.forEach.call(binstr, function (ch, i) {
    buf[i] = ch.charCodeAt(0);
  });

  return buf;
}

function base64ToBuffer(base64) {
  var binstr = atob(base64);
  var buf = binaryStringToBuffer(binstr);
  return buf;
}

// Hex Convenience Functions
, hexToBuffer: hexToBuffer
, bufferToHex: bufferToHex

function bufferToHex(arr) {
  var i;
  var len;
  var hex = '';
  var c;

  for (i = 0, len = arr.length; i < len; i += 1) {
    c = arr[i].toString(16);
    if (c.length < 2) {
      c = '0' + c;
    }
    hex += c;
  }

  return hex;
}

function hexToBuffer(hex) {
  // TODO use Uint8Array or ArrayBuffer or DataView
  var i;
  var byteLen = hex.length / 2;
  var arr;
  var j = 0;

  if (byteLen !== parseInt(byteLen, 10)) {
    throw new Error("Invalid hex length '" + hex.length + "'");
  }

  arr = new Uint8Array(byteLen);

  for (i = 0; i < byteLen; i += 1) {
    arr[i] = parseInt(hex[j] + hex[j + 1], 16);
    j += 2;
  }

  return arr;
}

window.Unibabel = {
  utf8ToBinaryString: utf8ToBinaryString
, utf8ToBuffer: utf8ToBuffer
, utf8ToBase64: utf8ToBase64
, binaryStringToUtf8: binaryStringToUtf8
, bufferToUtf8: bufferToUtf8
, base64ToUtf8: base64ToUtf8
, bufferToBinaryString: bufferToBinaryString
, bufferToBase64: bufferToBase64
, binaryStringToBuffer: binaryStringToBuffer
, base64ToBuffer: base64ToBuffer

// compat
, strToUtf8Arr: utf8ToBuffer
, utf8ArrToStr: bufferToUtf8
, arrToBase64: bufferToBase64
, base64ToArr: base64ToBuffer
};

}());