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Current File : /home/jalalj2hb/www/ftm-admin/bower_components/jszip/lib/flate.js

'use strict';
var USE_TYPEDARRAY = (typeof Uint8Array !== 'undefined') && (typeof Uint16Array !== 'undefined') && (typeof Uint32Array !== 'undefined');

var pako = require("pako");
var utils = require("./utils");
var GenericWorker = require("./stream/GenericWorker");

var ARRAY_TYPE = USE_TYPEDARRAY ? "uint8array" : "array";

exports.magic = "\x08\x00";

/**
 * Create a worker that uses pako to inflate/deflate.
 * @constructor
 * @param {String} action the name of the pako function to call : either "Deflate" or "Inflate".
 * @param {Object} options the options to use when (de)compressing.
 */
function FlateWorker(action, options) {
    GenericWorker.call(this, "FlateWorker/" + action);

    this._pako = new pako[action]({
        raw:true,
        level : options.level || -1 // default compression
    });
    // the `meta` object from the last chunk received
    // this allow this worker to pass around metadata
    this.meta = {};

    var self = this;
    this._pako.onData = function(data) {
        self.push({
            data : data,
            meta : self.meta
        });
    };
}

utils.inherits(FlateWorker, GenericWorker);

/**
 * @see GenericWorker.processChunk
 */
FlateWorker.prototype.processChunk = function (chunk) {
    this.meta = chunk.meta;
    this._pako.push(utils.transformTo(ARRAY_TYPE, chunk.data), false);
};

/**
 * @see GenericWorker.flush
 */
FlateWorker.prototype.flush = function () {
    GenericWorker.prototype.flush.call(this);
    this._pako.push([], true);
};
/**
 * @see GenericWorker.cleanUp
 */
FlateWorker.prototype.cleanUp = function () {
    GenericWorker.prototype.cleanUp.call(this);
    this._pako = null;
};

exports.compressWorker = function (compressionOptions) {
    return new FlateWorker("Deflate", compressionOptions);
};
exports.uncompressWorker = function () {
    return new FlateWorker("Inflate", {});
};

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