js-adler32/demo/work.js

29 lines
898 B
JavaScript

/* js-adler32 (C) 2014-present SheetJS -- http://sheetjs.com */
/*:: declare var ADLER32: ADLER32Module; */
/*:: declare var self: DedicatedWorkerGlobalScope; */
importScripts('../adler32.js');
/*::self.*/postMessage({t:"ready"});
var readler = function(f, adler, l) {
/*::self.*/postMessage({t:"iter", f:f, adler:adler, l:l, sz:f.size});
if(l >= f.size) return /*::self.*/postMessage({t:"done"});
var sz = 0x100000; if(l + sz > f.size) sz = f.size - l;
var d = f.slice(l, l + sz);
var r = new FileReader();
r.onload = function(e) {
var b = new Uint8Array(e.target.result);
var newadler = ADLER32.buf(b, adler);
/*::self.*/postMessage({t:"data", adler:newadler, bytes:l+sz});
readler(f, newadler, l + sz);
};
r.readAsArrayBuffer(d);
};
onmessage = function (oEvent) {
/*::self.*/postMessage({t:"start"});
var f/*:File*/ = oEvent.data;
var seed = 1;
readler(f, seed, 0);
};