Subslice decodes entire array in IE11 #16

bwindels · 2020-09-18T08:37:48Z

<!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?).

The text was updated successfully, but these errors were encountered:

bwindels changed the title ~~Subslice decodes to entire array in IE11~~ Subslice decodes entire array in IE11 Sep 18, 2020

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Subslice decodes entire array in IE11 #16

Subslice decodes entire array in IE11 #16

bwindels commented Sep 18, 2020 •

edited

Subslice decodes entire array in IE11 #16

Subslice decodes entire array in IE11 #16

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bwindels commented Sep 18, 2020 • edited

bwindels commented Sep 18, 2020 •

edited