ambari-web/app/utils/lz-string.js

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

var LZString = (function() {

// private property
  var f = String.fromCharCode;
  var keyStrBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  var keyStrUriSafe = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-$";
  var baseReverseDic = {};

  function getBaseValue(alphabet, character) {
    if (!baseReverseDic[alphabet]) {
      baseReverseDic[alphabet] = {};
      for (var i=0 ; i<alphabet.length ; i++) {
        baseReverseDic[alphabet][alphabet.charAt(i)] = i;
      }
    }
    return baseReverseDic[alphabet][character];
  }

  var LZString = {
    compressToBase64 : function (input) {
      if (input == null) return "";
      var res = LZString._compress(input, 6, function(a){return keyStrBase64.charAt(a);});
      switch (res.length % 4) { // To produce valid Base64
        default: // When could this happen ?
        case 0 : return res;
        case 1 : return res+"===";
        case 2 : return res+"==";
        case 3 : return res+"=";
      }
    },

    decompressFromBase64 : function (input) {
      if (input == null) return "";
      if (input == "") return null;
      return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrBase64, input.charAt(index)); });
    },

    compressToUTF16 : function (input) {
      if (input == null) return "";
      return LZString._compress(input, 15, function(a){return f(a+32);}) + " ";
    },

    decompressFromUTF16: function (compressed) {
      if (compressed == null) return "";
      if (compressed == "") return null;
      return LZString._decompress(compressed.length, 16384, function(index) { return compressed.charCodeAt(index) - 32; });
    },

    //compress into uint8array (UCS-2 big endian format)
    compressToUint8Array: function (uncompressed) {
      var compressed = LZString.compress(uncompressed);
      var buf=new Uint8Array(compressed.length*2); // 2 bytes per character

      for (var i=0, TotalLen=compressed.length; i<TotalLen; i++) {
        var current_value = compressed.charCodeAt(i);
        buf[i*2] = current_value >>> 8;
        buf[i*2+1] = current_value % 256;
      }
      return buf;
    },

    //decompress from uint8array (UCS-2 big endian format)
    decompressFromUint8Array:function (compressed) {
      if (compressed===null || compressed===undefined){
        return LZString.decompress(compressed);
      } else {
        var buf=new Array(compressed.length/2); // 2 bytes per character
        for (var i=0, TotalLen=buf.length; i<TotalLen; i++) {
          buf[i]=compressed[i*2]*256+compressed[i*2+1];
        }

        var result = [];
        buf.forEach(function (c) {
          result.push(f(c));
        });
        return LZString.decompress(result.join(''));

      }

    },


    //compress into a string that is already URI encoded
    compressToEncodedURIComponent: function (input) {
      if (input == null) return "";
      return LZString._compress(input, 6, function(a){return keyStrUriSafe.charAt(a);});
    },

    //decompress from an output of compressToEncodedURIComponent
    decompressFromEncodedURIComponent:function (input) {
      if (input == null) return "";
      if (input == "") return null;
      input = input.replace(/ /g, "+");
      return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrUriSafe, input.charAt(index)); });
    },

    compress: function (uncompressed) {
      return LZString._compress(uncompressed, 16, function(a){return f(a);});
    },
    _compress: function (uncompressed, bitsPerChar, getCharFromInt) {
      if (uncompressed == null) return "";
      var i, value,
      context_dictionary= {},
      context_dictionaryToCreate= {},
      context_c="",
      context_wc="",
      context_w="",
      context_enlargeIn= 2, // Compensate for the first entry which should not count
      context_dictSize= 3,
      context_numBits= 2,
      context_data=[],
      context_data_val=0,
      context_data_position=0,
      ii;

      for (ii = 0; ii < uncompressed.length; ii += 1) {
        context_c = uncompressed.charAt(ii);
        if (!Object.prototype.hasOwnProperty.call(context_dictionary,context_c)) {
          context_dictionary[context_c] = context_dictSize++;
          context_dictionaryToCreate[context_c] = true;
        }

        context_wc = context_w + context_c;
        if (Object.prototype.hasOwnProperty.call(context_dictionary,context_wc)) {
          context_w = context_wc;
        } else {
          if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {
            if (context_w.charCodeAt(0)<256) {
              for (i=0 ; i<context_numBits ; i++) {
                context_data_val = (context_data_val << 1);
                if (context_data_position == bitsPerChar-1) {
                  context_data_position = 0;
                  context_data.push(getCharFromInt(context_data_val));
                  context_data_val = 0;
                } else {
                  context_data_position++;
                }
              }
              value = context_w.charCodeAt(0);
              for (i=0 ; i<8 ; i++) {
                context_data_val = (context_data_val << 1) | (value&1);
                if (context_data_position == bitsPerChar-1) {
                  context_data_position = 0;
                  context_data.push(getCharFromInt(context_data_val));
                  context_data_val = 0;
                } else {
                  context_data_position++;
                }
                value = value >> 1;
              }
            } else {
              value = 1;
              for (i=0 ; i<context_numBits ; i++) {
                context_data_val = (context_data_val << 1) | value;
                if (context_data_position ==bitsPerChar-1) {
                  context_data_position = 0;
                  context_data.push(getCharFromInt(context_data_val));
                  context_data_val = 0;
                } else {
                  context_data_position++;
                }
                value = 0;
              }
              value = context_w.charCodeAt(0);
              for (i=0 ; i<16 ; i++) {
                context_data_val = (context_data_val << 1) | (value&1);
                if (context_data_position == bitsPerChar-1) {
                  context_data_position = 0;
                  context_data.push(getCharFromInt(context_data_val));
                  context_data_val = 0;
                } else {
                  context_data_position++;
                }
                value = value >> 1;
              }
            }
            context_enlargeIn--;
            if (context_enlargeIn == 0) {
              context_enlargeIn = Math.pow(2, context_numBits);
              context_numBits++;
            }
            delete context_dictionaryToCreate[context_w];
          } else {
            value = context_dictionary[context_w];
            for (i=0 ; i<context_numBits ; i++) {
              context_data_val = (context_data_val << 1) | (value&1);
              if (context_data_position == bitsPerChar-1) {
                context_data_position = 0;
                context_data.push(getCharFromInt(context_data_val));
                context_data_val = 0;
              } else {
                context_data_position++;
              }
              value = value >> 1;
            }


          }
          context_enlargeIn--;
          if (context_enlargeIn == 0) {
            context_enlargeIn = Math.pow(2, context_numBits);
            context_numBits++;
          }
          // Add wc to the dictionary.
          context_dictionary[context_wc] = context_dictSize++;
          context_w = String(context_c);
        }
      }

      // Output the code for w.
      if (context_w !== "") {
        if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {
          if (context_w.charCodeAt(0)<256) {
            for (i=0 ; i<context_numBits ; i++) {
              context_data_val = (context_data_val << 1);
              if (context_data_position == bitsPerChar-1) {
                context_data_position = 0;
                context_data.push(getCharFromInt(context_data_val));
                context_data_val = 0;
              } else {
                context_data_position++;
              }
            }
            value = context_w.charCodeAt(0);
            for (i=0 ; i<8 ; i++) {
              context_data_val = (context_data_val << 1) | (value&1);
              if (context_data_position == bitsPerChar-1) {
                context_data_position = 0;
                context_data.push(getCharFromInt(context_data_val));
                context_data_val = 0;
              } else {
                context_data_position++;
              }
              value = value >> 1;
            }
          } else {
            value = 1;
            for (i=0 ; i<context_numBits ; i++) {
              context_data_val = (context_data_val << 1) | value;
              if (context_data_position == bitsPerChar-1) {
                context_data_position = 0;
                context_data.push(getCharFromInt(context_data_val));
                context_data_val = 0;
              } else {
                context_data_position++;
              }
              value = 0;
            }
            value = context_w.charCodeAt(0);
            for (i=0 ; i<16 ; i++) {
              context_data_val = (context_data_val << 1) | (value&1);
              if (context_data_position == bitsPerChar-1) {
                context_data_position = 0;
                context_data.push(getCharFromInt(context_data_val));
                context_data_val = 0;
              } else {
                context_data_position++;
              }
              value = value >> 1;
            }
          }
          context_enlargeIn--;
          if (context_enlargeIn == 0) {
            context_enlargeIn = Math.pow(2, context_numBits);
            context_numBits++;
          }
          delete context_dictionaryToCreate[context_w];
        } else {
          value = context_dictionary[context_w];
          for (i=0 ; i<context_numBits ; i++) {
            context_data_val = (context_data_val << 1) | (value&1);
            if (context_data_position == bitsPerChar-1) {
              context_data_position = 0;
              context_data.push(getCharFromInt(context_data_val));
              context_data_val = 0;
            } else {
              context_data_position++;
            }
            value = value >> 1;
          }


        }
        context_enlargeIn--;
        if (context_enlargeIn == 0) {
          context_enlargeIn = Math.pow(2, context_numBits);
          context_numBits++;
        }
      }

      // Mark the end of the stream
      value = 2;
      for (i=0 ; i<context_numBits ; i++) {
        context_data_val = (context_data_val << 1) | (value&1);
        if (context_data_position == bitsPerChar-1) {
          context_data_position = 0;
          context_data.push(getCharFromInt(context_data_val));
          context_data_val = 0;
        } else {
          context_data_position++;
        }
        value = value >> 1;
      }

      // Flush the last char
      while (true) {
        context_data_val = (context_data_val << 1);
        if (context_data_position == bitsPerChar-1) {
          context_data.push(getCharFromInt(context_data_val));
          break;
        }
        else context_data_position++;
      }
      return context_data.join('');
    },

    decompress: function (compressed) {
      if (compressed == null) return "";
      if (compressed == "") return null;
      return LZString._decompress(compressed.length, 32768, function(index) { return compressed.charCodeAt(index); });
    },

    _decompress: function (length, resetValue, getNextValue) {
      var dictionary = [],
      next,
      enlargeIn = 4,
      dictSize = 4,
      numBits = 3,
      entry = "",
      result = [],
      i,
      w,
      bits, resb, maxpower, power,
      c,
      data = {val:getNextValue(0), position:resetValue, index:1};

      for (i = 0; i < 3; i += 1) {
        dictionary[i] = i;
      }

      bits = 0;
      maxpower = Math.pow(2,2);
      power=1;
      while (power!=maxpower) {
        resb = data.val & data.position;
        data.position >>= 1;
        if (data.position == 0) {
          data.position = resetValue;
          data.val = getNextValue(data.index++);
        }
        bits |= (resb>0 ? 1 : 0) * power;
        power <<= 1;
      }

      switch (next = bits) {
        case 0:
          bits = 0;
          maxpower = Math.pow(2,8);
          power=1;
          while (power!=maxpower) {
            resb = data.val & data.position;
            data.position >>= 1;
            if (data.position == 0) {
              data.position = resetValue;
              data.val = getNextValue(data.index++);
            }
            bits |= (resb>0 ? 1 : 0) * power;
            power <<= 1;
          }
          c = f(bits);
          break;
        case 1:
          bits = 0;
          maxpower = Math.pow(2,16);
          power=1;
          while (power!=maxpower) {
            resb = data.val & data.position;
            data.position >>= 1;
            if (data.position == 0) {
              data.position = resetValue;
              data.val = getNextValue(data.index++);
            }
            bits |= (resb>0 ? 1 : 0) * power;
            power <<= 1;
          }
          c = f(bits);
          break;
        case 2:
          return "";
      }
      dictionary[3] = c;
      w = c;
      result.push(c);
      while (true) {
        if (data.index > length) {
          return "";
        }

        bits = 0;
        maxpower = Math.pow(2,numBits);
        power=1;
        while (power!=maxpower) {
          resb = data.val & data.position;
          data.position >>= 1;
          if (data.position == 0) {
            data.position = resetValue;
            data.val = getNextValue(data.index++);
          }
          bits |= (resb>0 ? 1 : 0) * power;
          power <<= 1;
        }

        switch (c = bits) {
          case 0:
            bits = 0;
            maxpower = Math.pow(2,8);
            power=1;
            while (power!=maxpower) {
              resb = data.val & data.position;
              data.position >>= 1;
              if (data.position == 0) {
                data.position = resetValue;
                data.val = getNextValue(data.index++);
              }
              bits |= (resb>0 ? 1 : 0) * power;
              power <<= 1;
            }

            dictionary[dictSize++] = f(bits);
            c = dictSize-1;
            enlargeIn--;
            break;
          case 1:
            bits = 0;
            maxpower = Math.pow(2,16);
            power=1;
            while (power!=maxpower) {
              resb = data.val & data.position;
              data.position >>= 1;
              if (data.position == 0) {
                data.position = resetValue;
                data.val = getNextValue(data.index++);
              }
              bits |= (resb>0 ? 1 : 0) * power;
              power <<= 1;
            }
            dictionary[dictSize++] = f(bits);
            c = dictSize-1;
            enlargeIn--;
            break;
          case 2:
            return result.join('');
        }

        if (enlargeIn == 0) {
          enlargeIn = Math.pow(2, numBits);
          numBits++;
        }

        if (dictionary[c]) {
          entry = dictionary[c];
        } else {
          if (c === dictSize) {
            entry = w + w.charAt(0);
          } else {
            return null;
          }
        }
        result.push(entry);

        // Add w+entry[0] to the dictionary.
        dictionary[dictSize++] = w + entry.charAt(0);
        enlargeIn--;

        w = entry;

        if (enlargeIn == 0) {
          enlargeIn = Math.pow(2, numBits);
          numBits++;
        }

      }
    }
  };
  return LZString;
})();

if (typeof define === 'function' && define.amd) {
  define(function () { return LZString; });
} else if( typeof module !== 'undefined' && module != null ) {
  module.exports = LZString
}