SharedArrayBuffer error

[mgerhardy]

I am compiling my code with emscripten pthread support and get this error.

Uncaught TypeError: Blob constructor: ArrayBufferView branch of ((ArrayBufferView
or ArrayBuffer) or Blob or USVString) can't be a SharedArrayBuffer or an
ArrayBufferView backed by a SharedArrayBuffer

Caused by this line:

  a.href = URL.createObjectURL(new Blob([new Uint8Array(Module["HEAPU8"].buffer, 
           buffer, buffer_size)], {type: UTF8ToString(mime_type)}));

[mgerhardy]

here is the fix for download (upload doesn't need to be fixed) - first copy into an ArrayBuffer and then use that one.

  /// Offer a buffer in memory as a file to download, specifying download filename and mime type
  var a = document.createElement('a');
  a.download = UTF8ToString(filename);
  var bufferCopy = new ArrayBuffer(buffer_size);
  var uint8Array = new Uint8Array(bufferCopy);
  uint8Array.set(new Uint8Array(Module["HEAPU8"].buffer, buffer, buffer_size));
  a.href = URL.createObjectURL(new Blob([uint8Array], {type: UTF8ToString(mime_type)}));
  a.click();

[themancalledjakob]

nice, this worked for me as well.

I had a slightly different error (maybe just wording?)

Uncaught TypeError: Failed to construct 'Blob': The provided ArrayBufferView value must not be shared.

any reason why this shouldn't be adjusted in the repo?

[slowriot]

Please raise a pull request with your proposed fixes!