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