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gaia/shared/js/gzip/gzip_worker.js

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+/* global Zlib */
+'use strict';
+
+importScripts('gzip.min.js');
+
+self.onmessage = function(message) {
+  var cmd = message.data.cmd;
+
+  if (cmd === 'gzip') {
+    // gzip function requires Uint8Array
+    var textEncoder = new TextEncoder('utf8');
+    var payload = message.data.payload;
+    var uint8Data = textEncoder.encode(payload);
+
+    try {
+      var gzip = new Zlib.Gzip(uint8Data);
+      var compressed = gzip.compress();
+      postMessage({returnResult: true, gzipData: compressed});
+    }
+    catch(e) {
+      postMessage({returnResult: false, error: e});
+    }
+  } else {
+    console.warn('GzipWorker, unsupported cmd:', cmd);
+  }
+};
+