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help chrome gc by reusing one filereader

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ed 2022-08-18 00:05:32 +02:00
parent 50a477ee47
commit 539e7b8efe
1 changed files with 14 additions and 3 deletions
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17
copyparty/web/w.hash.js
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@ -8,7 +8,7 @@ function hex2u8(txt) {
var subtle = null;
try {
subtle = crypto.subtle || crypto.webkitSubtle;
subtle = crypto.subtle;
subtle.digest('SHA-512', new Uint8Array(1)).then(
function (x) { },
function (x) { load_fb(); }
@ -23,11 +23,20 @@ function load_fb() {
}
var reader = null,
busy = false;
onmessage = (d) => {
var [nchunk, fobj, car, cdr] = d.data,
t0 = Date.now(),
if (busy)
return postMessage(["panic", 'worker got another task while busy']);
if (!reader)
reader = new FileReader();
var [nchunk, fobj, car, cdr] = d.data,
t0 = Date.now();
reader.onload = function (e) {
try {
//console.log('[ w] %d HASH bgin', nchunk);
@ -49,12 +58,14 @@ onmessage = (d) => {
postMessage(["ferr", err]);
};
//console.log('[ w] %d read bgin', nchunk);
busy = true;
reader.readAsArrayBuffer(
File.prototype.slice.call(fobj, car, cdr));
var hash_calc = function (buf) {
var hash_done = function (hashbuf) {
busy = false;
try {
var hslice = new Uint8Array(hashbuf).subarray(0, 33);
//console.log('[ w] %d HASH DONE', nchunk);