fileReadSlice_worker.js

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/**

 * Expects an object containing a blob, a start index and an end index

 * for slicing. Returns the contents of the blob read as text.

*/

onmessage = function (event) {

  var blob = event.data.blob;

  var start = event.data.start;

  var end = event.data.end;

  var slicedBlob = blob.slice(start, end);

  var fileReader = new FileReaderSync();

  var text = fileReader.readAsText(slicedBlob);

  postMessage(text);

};