[Webkit-unassigned] [Bug 175568] data: URL base64 handling different from atob()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175568

--- Comment #4 from Chris Dumez <cdumez at apple.com> ---
(In reply to Chris Dumez from comment #3)
> Looking at DataURLDecoder, I see the following logic:
>     // First try base64url.
>     if (!base64URLDecode(task.encodedData.toStringWithoutCopying(), buffer))
> {
>         // Didn't work, try unescaping and decoding as base64.
>         auto unescapedString =
> decodeURLEscapeSequences(task.encodedData.toStringWithoutCopying());
>         if (!base64Decode(unescapedString, buffer,
> Base64IgnoreSpacesAndNewLines))
>             return;
>     }

This was introduced in Bug 148128 when WebKit started doing data URL decoding by itself. Before this, I believe we let CFNetwork decode those for us (No idea exactly how this behaved).

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