27 lines
734 B
JavaScript
27 lines
734 B
JavaScript
export default class BlobSlicer {
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constructor(blob, size) {
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this.blob = blob;
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this.index = 0;
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this.chunkSize = size;
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}
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pull(controller) {
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return new Promise((resolve, reject) => {
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const bytesLeft = this.blob.size - this.index;
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if (bytesLeft <= 0) {
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controller.close();
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return resolve();
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}
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const size = Math.min(this.chunkSize, bytesLeft);
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const blob = this.blob.slice(this.index, this.index + size);
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const reader = new FileReader();
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reader.onload = () => {
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controller.enqueue(new Uint8Array(reader.result));
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resolve();
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};
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reader.onerror = reject;
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reader.readAsArrayBuffer(blob);
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this.index += size;
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});
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}
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}
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