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'use strict';
var external = require("./external");
var DataWorker = require('./stream/DataWorker');
var Crc32Probe = require('./stream/Crc32Probe');
var DataLengthProbe = require('./stream/DataLengthProbe');
/**
* Represent a compressed object, with everything needed to decompress it.
* @constructor
* @param {number} compressedSize the size of the data compressed.
* @param {number} uncompressedSize the size of the data after decompression.
* @param {number} crc32 the crc32 of the decompressed file.
* @param {object} compression the type of compression, see lib/compressions.js.
* @param {String|ArrayBuffer|Uint8Array|Buffer} data the compressed data.
*/
function CompressedObject(compressedSize, uncompressedSize, crc32, compression, data) {
this.compressedSize = compressedSize;
this.uncompressedSize = uncompressedSize;
this.crc32 = crc32;
this.compression = compression;
this.compressedContent = data;
}
CompressedObject.prototype = {
/**
* Create a worker to get the uncompressed content.
* @return {GenericWorker} the worker.
*/
getContentWorker: function () {
var worker = new DataWorker(external.Promise.resolve(this.compressedContent))
.pipe(this.compression.uncompressWorker())
.pipe(new DataLengthProbe("data_length"));
var that = this;
worker.on("end", function () {
if (this.streamInfo['data_length'] !== that.uncompressedSize) {
throw new Error("Bug : uncompressed data size mismatch");
}
});
return worker;
},
/**
* Create a worker to get the compressed content.
* @return {GenericWorker} the worker.
*/
getCompressedWorker: function () {
return new DataWorker(external.Promise.resolve(this.compressedContent))
.withStreamInfo("compressedSize", this.compressedSize)
.withStreamInfo("uncompressedSize", this.uncompressedSize)
.withStreamInfo("crc32", this.crc32)
.withStreamInfo("compression", this.compression)
;
}
};
/**
* Chain the given worker with other workers to compress the content with the
* given compression.
* @param {GenericWorker} uncompressedWorker the worker to pipe.
* @param {Object} compression the compression object.
* @param {Object} compressionOptions the options to use when compressing.
* @return {GenericWorker} the new worker compressing the content.
*/
CompressedObject.createWorkerFrom = function (uncompressedWorker, compression, compressionOptions) {
return uncompressedWorker
.pipe(new Crc32Probe())
.pipe(new DataLengthProbe("uncompressedSize"))
.pipe(compression.compressWorker(compressionOptions))
.pipe(new DataLengthProbe("compressedSize"))
.withStreamInfo("compression", compression);
};
module.exports = CompressedObject;