text: /*global escape:true */
  
  var TableStore = require('./core');
  var cryptoLib = require('crypto');
  var os = require('os');
  var int64buffer = require("int64-buffer");
  
  /* jshint -W079 */
  var Buffer = require('buffer').Buffer;
  /* jshint +W079 */
  
  /**
   * A set of utility methods for use with the TableStore SDK.
   *
   * @!attribute abort
   *   Return this value from an iterator function {each} or {arrayEach}
   *   to break out of the iteration.
   *   @example Breaking out of an iterator function
   *     TableStore.util.each({a: 1, b: 2, c: 3}, function(key, value) {
   *       if (key == 'b') return TableStore.util.abort;
   *     });
   *   @see each
   *   @see arrayEach
   * @api private
   */
  TableStore.util = {
    engine: function engine() {
      if (TableStore.util.isBrowser() && typeof navigator !== 'undefined') {
        return navigator.userAgent;
      } else {
        return process.platform + '/' + process.version;
      }
    },
  
    userAgent: function userAgent() {
      // 在 浏览器中不能设置 ua
      return "";
    },
    isBrowser: function isBrowser() { return typeof window !== 'undefined'; },
    isNode: function isNode() { return !TableStore.util.isBrowser(); },
    nodeRequire: function nodeRequire(module) {
      if (TableStore.util.isNode()) return require(module);
    },
    topEscape: function (clearString) {
      var output = '';
      var x = 0;
      clearString = clearString.toString();
      var regex = /(^[a-zA-Z0-9-_.~]*)/;
      while (x < clearString.length) {
        var match = regex.exec(clearString.substr(x));
        if (match != null && match.length > 1 && match[1] != '') {
          output += match[1];
          x += match[1].length;
        } else {
          if (clearString[x] == ' ')
            output += '%20';
          else {
            var charCode = clearString.charCodeAt(x);
            var hexVal = charCode.toString(16);
            output += '%' + (hexVal.length < 2 ? '0' : '') + hexVal.toUpperCase();
          }
          x++;
        }
      }
      return output;
    },
  
    popEscape: function (clearString) {
      clearString = clearString.toString();
      clearString = encodeURIComponent(clearString)
        .replace(/\!/gi, '%21')
        .replace(/\'/gi, '%27')
        .replace(/\(/gi, '%28')
        .replace(/\)/gi, '%29')
        .replace(/\*/gi, '%2A')
      return clearString;
    },
  
    uriEscape: function uriEscape(string) {
      /*jshint undef:false */
      var output = encodeURIComponent(string);
      output = output.replace(/[^A-Za-z0-9_.~\-%]+/g, escape);
  
      // percent-encodes some extra non-standard characters in a URI
      output = output.replace(/[*]/g, function (ch) {
        return '%' + ch.charCodeAt(0).toString(16).toUpperCase();
      });
  
      return output;
    },
  
    uriEscapePath: function uriEscapePath(string) {
      var parts = [];
      TableStore.util.arrayEach(string.split('/'), function (part) {
        parts.push(TableStore.util.uriEscape(part));
      });
      return parts.join('/');
    },
  
    urlParse: function urlParse(url) {
      return require('url').parse(url);
    },
  
    urlFormat: function urlFormat(url) {
      return require('url').format(url);
    },
  
    uuid: function generateUUID() {
      var d = new Date().getTime();
      if (window.performance && typeof window.performance.now === "function") {
        d += performance.now(); //use high-precision timer if available
      }
      var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        var r = (d + Math.random() * 16) % 16 | 0;
        d = Math.floor(d / 16);
        return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
      });
      return uuid;
    },
  
    queryParamsToString: function queryParamsToString(params) {
      var items = [];
      var escape = TableStore.util.uriEscape;
      var sortedKeys = Object.keys(params).sort();
  
      TableStore.util.arrayEach(sortedKeys, function (name) {
        var value = params[name];
        var ename = escape(name);
        var result = ename;
        if (Array.isArray(value)) {
          var vals = [];
          TableStore.util.arrayEach(value, function (item) { vals.push(escape(item)); });
          result = ename + '=' + vals.sort().join('&' + ename + '=');
        } else if (value !== undefined && value !== null) {
          result = ename + '=' + escape(value);
        }
        items.push(result);
      });
  
      return items.join('&');
    },
  
    readFileSync: function readFileSync(path) {
      if (typeof window !== 'undefined') return null;
      return require('fs').readFileSync(path, 'utf-8');
    },
  
    base64: {
  
      encode: function encode64(string) {
        return new Buffer(string).toString('base64');
      },
  
      decode: function decode64(string) {
        return new Buffer(string, 'base64').toString();
      }
  
    },
  
    Buffer: Buffer,
  
    buffer: {
      /**
       * Concatenates a list of Buffer objects.
       */
      concat: function (buffers) {
        var length = 0,
          offset = 0,
          buffer = null, i;
  
        for (i = 0; i < buffers.length; i++) {
          length += buffers[i].length;
        }
  
        buffer = new Buffer(length);
  
        for (i = 0; i < buffers.length; i++) {
          buffers[i].copy(buffer, offset);
          offset += buffers[i].length;
        }
  
        return buffer;
      }
    },
  
    Int64: {
      doubleToRawLongBits: function (number) {
        var buf = new Buffer(8);
         buf.fill(0);
         buf.writeDoubleLE(number, 0);
  
         var int64 = new int64buffer.Int64LE(buf);
         return int64;
      }
    },
  
    string: {
      byteLength: function byteLength(string) {
        if (string === null || string === undefined) return 0;
        if (typeof string === 'string') string = new Buffer(string);
  
        if (typeof string.byteLength === 'number') {
          return string.byteLength;
        } else if (typeof string.length === 'number') {
          return string.length;
        } else if (typeof string.size === 'number') {
          return string.size;
        } else if (typeof string.path === 'string') {
          return require('fs').lstatSync(string.path).size;
        } else {
          throw TableStore.util.error(new Error('Cannot determine length of ' + string),
            { object: string });
        }
      },
      upperFirst: function upperFirst(string) {
        return string[0].toUpperCase() + string.substr(1);
      },
  
      lowerFirst: function lowerFirst(string) {
        return string[0].toLowerCase() + string.substr(1);
      }
    },
  
    /**
     * Date and time utility functions.
     */
    date: {
  
      /**
       * @return [Date] the current JavaScript date object. Since all
       *   TableStore services rely on this date object, you can override
       *   this function to provide a special time value to TableStore service
       *   requests.
       */
      getDate: function getDate() { return new Date(); },
  
      // for taobao open platform
      top: function top(date, fmt) {
        fmt = fmt || '%Y-%M-%dT%H:%m:%sZ';
  
        function pad(value) {
          return (value.toString().length < 2) ? '0' + value : value;
        };
  
        return fmt.replace(/%([a-zA-Z])/g, function (_, fmtCode) {
          switch (fmtCode) {
            case 'Y':
              return date.getUTCFullYear();
            case 'M':
              return pad(date.getUTCMonth() + 1);
            case 'd':
              return pad(date.getUTCDate());
            case 'H':
              return pad(date.getUTCHours());
            case 'm':
              return pad(date.getUTCMinutes());
            case 's':
              return pad(date.getUTCSeconds());
            default:
              throw new Error('Unsupported format code: ' + fmtCode);
          }
        });
      },
  
      /**
       * @return [String] the date in ISO-8601 format
       */
      iso8601: function iso8601(date) {
        if (date === undefined) { date = TableStore.util.date.getDate(); }
        return date.toISOString();
      },
  
      /**
       * @return [String] the date in RFC 822 format
       */
      rfc822: function rfc822(date) {
        if (date === undefined) { date = TableStore.util.date.getDate(); }
        return date.toUTCString().replace("UTC", "GMT");
      },
  
      unixSeconds: function unixSeconds(date) {
        if (date === undefined) { date = TableStore.util.date.getDate(); }
        return Math.floor(date.getTime() / 1000);
      },
  
      unixMilliseconds: function unixMilliseconds(date) {
        if (date === undefined) { date = TableStore.util.date.getDate(); }
        return date.getTime();
      },
  
      /**
       * @param [String,number,Date] date
       * @return [Date]
       */
      from: function format(date) {
        if (typeof date === 'number') {
          if (date.toString().length == 10) {
            return new Date(date * 1000); // unix timestamp in seconds
          }
          return new Date(date); // unix timestamp in mill seconds
        }
        else if (Object.prototype.toString.call(date) === '[object Date]') {
          return date;
        }
        else {
          return new Date(date);
        }
      },
  
      /**
       * Given a Date or date-like value, this function formats the
       * date into a string of the requested value.
       * @param [String,number,Date] date
       * @param [String] formatter Valid formats are:
       #   * 'iso8601'
       #   * 'rfc822'
       #   * 'unixSeconds'
       #   * 'unixMilliseconds'
       * @return [String]
       */
      format: function format(date, formatter) {
        if (!formatter) formatter = 'unixSeconds';
        return TableStore.util.date[formatter](TableStore.util.date.from(date));
      }
  
    },
  
    crypto: {
      crc32Table: [
        0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419,
        0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4,
        0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07,
        0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
        0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856,
        0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
        0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4,
        0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
        0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
        0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A,
        0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599,
        0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
        0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190,
        0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F,
        0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E,
        0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
        0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED,
        0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
        0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3,
        0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
        0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A,
        0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5,
        0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010,
        0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
        0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17,
        0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6,
        0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
        0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
        0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344,
        0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
        0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A,
        0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
        0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1,
        0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C,
        0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF,
        0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
        0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE,
        0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31,
        0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C,
        0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
        0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B,
        0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242,
        0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1,
        0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
        0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
        0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7,
        0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66,
        0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
        0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605,
        0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8,
        0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B,
        0x2D02EF8D],
  
      crc32: function crc32(data) {
        /*jshint bitwise:false*/
        var tbl = TableStore.util.crypto.crc32Table;
        var crc = 0 ^ -1;
  
        if (typeof data === 'string') {
          data = new Buffer(data);
        }
  
        for (var i = 0; i < data.length; i++) {
          var code = data.readUInt8(i);
          crc = (crc >>> 8) ^ tbl[(crc ^ code) & 0xFF];
        }
        return (crc ^ -1) >>> 0;
      },
  
      hmac: function hmac(key, string, digest, fn) {
        if (!digest) digest = 'binary';
        if (digest === 'buffer') { digest = undefined; }
        if (!fn) fn = 'sha256';
        if (typeof string === 'string') string = new Buffer(string);
        return cryptoLib.createHmac(fn, key).update(string).digest(digest);
      },
  
      md5: function md5(data, digest) {
        if (!digest) { digest = 'binary'; }
        if (digest === 'buffer') { digest = undefined; }
        if (typeof data === 'string') data = new Buffer(data);
        return TableStore.util.crypto.createHash('md5').update(data).digest(digest);
      },
  
      sha256: function sha256(string, digest) {
        if (!digest) { digest = 'binary'; }
        if (digest === 'buffer') { digest = undefined; }
        if (typeof string === 'string') string = new Buffer(string);
        return TableStore.util.crypto.createHash('sha256').update(string).digest(digest);
      },
  
      toHex: function toHex(data) {
        var out = [];
        for (var i = 0; i < data.length; i++) {
          out.push(('0' + data.charCodeAt(i).toString(16)).substr(-2, 2));
        }
        return out.join('');
      },
  
      createHash: function createHash(algorithm) {
        return cryptoLib.createHash(algorithm);
      }
  
    },
  
    /** @!ignore */
  
    /* Abort constant */
    abort: {},
  
    each: function each(object, iterFunction) {
      for (var key in object) {
        if (object.hasOwnProperty(key)) {
          var ret = iterFunction.call(this, key, object[key]);
          if (ret === TableStore.util.abort) break;
        }
      }
    },
  
    arrayEach: function arrayEach(array, iterFunction) {
      for (var idx in array) {
        if (array.hasOwnProperty(idx)) {
          var ret = iterFunction.call(this, array[idx], parseInt(idx, 10));
          if (ret === TableStore.util.abort) break;
        }
      }
    },
  
    update: function update(obj1, obj2) {
      TableStore.util.each(obj2, function iterator(key, item) {
        obj1[key] = item;
      });
      return obj1;
    },
  
    merge: function merge(obj1, obj2) {
      return TableStore.util.update(TableStore.util.copy(obj1), obj2);
    },
  
    copy: function copy(object) {
      if (object === null || object === undefined) return object;
      var dupe = {};
      /*jshint forin:false */
      for (var key in object) {
        dupe[key] = object[key];
      }
      return dupe;
    },
  
    isEmpty: function isEmpty(obj) {
      for (var prop in obj) {
        if (obj.hasOwnProperty(prop)) {
          return false;
        }
      }
      return true;
    },
  
    isType: function isType(obj, type) {
      // handle cross-"frame" objects
      if (typeof type === 'function') type = TableStore.util.typeName(type);
      return Object.prototype.toString.call(obj) === '[object ' + type + ']';
    },
  
    typeName: function typeName(type) {
      if (type.hasOwnProperty('name')) return type.name;
      var str = type.toString();
      var match = str.match(/^\s*function (.+)\(/);
      return match ? match[1] : str;
    },
  
    error: function error(err, options) {
      var originalError = null;
      if (typeof err.message === 'string' && err.message !== '') {
        if (typeof options === 'string' || (options && options.message)) {
          originalError = TableStore.util.copy(err);
          originalError.message = err.message;
        }
      }
      err.message = err.message || null;
  
      if (typeof options === 'string') {
        err.message = options;
      }
      else if (typeof options === 'object') {
        TableStore.util.update(err, options);
        if (options.message)
          err.message = options.message;
        if (options.code || options.name)
          err.code = options.code || options.name;
        if (options.stack)
          err.stack = options.stack;
      }
  
      if (typeof Object.defineProperty === 'function') {
        Object.defineProperty(err, 'name', { writable: true, enumerable: false });
        Object.defineProperty(err, 'message', { enumerable: true });
      }
  
      err.name = err.name || err.code || 'Error';
      err.time = new Date();
  
      if (originalError) err.originalError = originalError;
  
      return err;
    },
  
    /**
     * @api private
     */
    inherit: function inherit(klass, features) {
      var newObject = null;
      if (features === undefined) {
        features = klass;
        klass = Object;
        newObject = {};
      } else {
        /*jshint newcap:false */
        /*jshint camelcase:false */
        var ctor = function __ctor_wrapper__() { };
        ctor.prototype = klass.prototype;
        newObject = new ctor();
      }
  
      // constructor not supplied, create pass-through ctor
      if (features.constructor === Object) {
        features.constructor = function () {
          if (klass !== Object) {
            return klass.apply(this, arguments);
          }
        };
      }
  
      features.constructor.prototype = newObject;
      TableStore.util.update(features.constructor.prototype, features);
      features.constructor.__super__ = klass;
      return features.constructor;
    },
  
    /**
     * @api private
     */
    mixin: function mixin() {
      var klass = arguments[0];
      for (var i = 1; i < arguments.length; i++) {
        /*jshint forin:false*/
        for (var prop in arguments[i].prototype) {
          var fn = arguments[i].prototype[prop];
          if (prop != 'constructor') {
            klass.prototype[prop] = fn;
          }
        }
      }
      return klass;
    },
  
    /**
     * @api private
     */
    hideProperties: function hideProperties(obj, props) {
      if (typeof Object.defineProperty !== 'function') return;
  
      TableStore.util.arrayEach(props, function (key) {
        Object.defineProperty(obj, key, {
          enumerable: false, writable: true, configurable: true
        });
      });
    }
  };
  
  module.exports = TableStore.util;
  