b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
52 lines
1.3 KiB
JavaScript
Executable file
52 lines
1.3 KiB
JavaScript
Executable file
define(
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[
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'exports'
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],
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function(
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exports
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) {
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/**
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* Asynchronously fetch the contents of a Blob, returning a Uint8Array.
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* Exists because there is no FileReader in Gecko workers and this totally
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* works. In discussion, it sounds like :sicking wants to deprecate the
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* FileReader API anyways.
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*
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* Our consumer in this case is our specialized base64 encode that wants a
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* Uint8Array since that is more compactly represented than a binary string
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* would be.
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*
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* @param blob {Blob}
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* @param callback {Function(err, Uint8Array)}
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*/
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function asyncFetchBlobAsUint8Array(blob, callback) {
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var blobUrl = URL.createObjectURL(blob);
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var xhr = new XMLHttpRequest();
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xhr.open('GET', blobUrl, true);
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xhr.responseType = 'arraybuffer';
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xhr.onload = function() {
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// blobs currently result in a status of 0 since there is no server.
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if (xhr.status !== 0 && (xhr.status < 200 || xhr.status >= 300)) {
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callback(xhr.status);
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return;
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}
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callback(null, new Uint8Array(xhr.response));
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};
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xhr.onerror = function() {
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callback('error');
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};
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try {
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xhr.send();
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}
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catch(ex) {
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console.error('XHR send() failure on blob');
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callback('error');
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}
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URL.revokeObjectURL(blobUrl);
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}
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return {
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asyncFetchBlobAsUint8Array: asyncFetchBlobAsUint8Array
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};
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}); // end define
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