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LibWeb: Make btoa() and atob() correctly handle values between 128 and 255

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btoa() takes a byte string, so it must decode the UTF-8 argument into
a Vector<u8> before calling encode_base64.

Likewise, in atob() decode_base64 returns a byte string, so that needs
to be converted to UTF-8.

With this, `btoa(String.fromCharCode(255))` is '/w==' as it should
be, and `atob(btoa(String.fromCharCode(255))) == String.fromCharCode(255)`
remains true.
This commit is contained in:
Nico Weber 2020-07-22 11:39:39 -04:00 • committed by Andreas Kling
parent 5ba8aba197
commit b9ce56aee6
3 changed files with 17 additions and 4 deletions
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1
Libraries/LibJS/Runtime/ErrorTypes.h
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@ -152,6 +152,7 @@
M(ToObjectNullOrUndef, "ToObject on null or undefined") \
M(UnknownIdentifier, "'%s' is not defined") \
/* LibWeb bindings */ \
M(NotAByteString, "Argument to %s() must be a byte string") \
M(BadArgCountOne, "%s() needs one argument") \
M(BadArgCountAtLeastOne, "%s() needs at least one argument") \
M(BadArgCountMany, "%s() needs %s arguments")