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reproduction.js
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reproduction.js
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function processInput(input) {
Promise.all(Array.prototype.map.call(input.files, processFile)).then(
() => {
alert("Success!");
},
(err) => {
alert(`Failure: ${err}`);
}
);
}
async function processFile(file) {
return new Promise((resolve, reject) => {
const chunkSize = 2097152;
const chunks = Math.ceil(file.size / chunkSize);
const fileReader = new FileReader();
let currentChunk = 0;
function loadNext() {
console.log(`loadNext - currentChunk=${currentChunk}`);
const start = currentChunk * chunkSize;
const end = start + chunkSize >= file.size ? file.size : start + chunkSize;
fileReader.readAsArrayBuffer(file.slice(start, end));
}
fileReader.onerror = (err) => {
fileReader.abort();
console.error("fileReader.onerror", err);
reject(new Error("fileReader.onError", {cause: err}));
};
fileReader.onload = (evt) => {
console.log("fileReader.onload", evt.target.result);
currentChunk += 1;
if (currentChunk < chunks) {
loadNext();
} else {
resolve(`Got ${chunks} chunks. Done.`);
}
}
loadNext();
});
}