FastestSmallestTextEncoderDecoder
FastestSmallestTextEncoderDecoder copied to clipboard
Published
20 hours ago •
anonyco
anonyco
Subslice decodes entire array in IE11
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<script src="https://dl.dropboxusercontent.com/s/r55397ld512etib/EncoderDecoderTogether.min.js?dl=0" nomodule="" type="text/javascript"></script>
<script type="text/javascript">
const bytes = [50,65,113,117,121,81,111,98,118,68,76,43,77,110,73,90,49,100,43,77,65,71,119,87,68,82,115,57,74,54,117,97,79,78,120,74,119,54,88,113,120,86,99];
var allBytes = new Uint8Array(16777216);
// write some A's to the beginning
for (var i = 100 - 1; i >= 0; i--) {
allBytes[i] = 65;
}
const offset = 242839;
for (var i = bytes.length - 1; i >= 0; i--) {
allBytes[i + offset] = bytes[i];
}
const slice = allBytes.subarray(offset, offset + bytes.length);
console.log("slice", slice.length, slice[0], slice);
const str = new TextDecoder().decode(slice);
console.log("str", str.length, str);
</script>
</body>
</html>
Output on IE11:
slice 43 50 [object Uint8Array]
str 16777216 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Output in Firefox 80 (expected output):
slice 43 50 Uint8Array(43) [ 50, 65, 113, 117, 121, 81, 111, 98, 118, 68, … ]
str 43 2AquyQobvDL+MnIZ1d+MAGwWDRs9J6uaONxJw6XqxVc
As you can see, on IE11, the slice returned from subarray has the correct length and correct first byte, but somehow decode decodes the entire allBytes array (until it finds a 0 byte?).
