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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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Libraries/LibJS/Forward.h
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@ -61,6 +61,7 @@
#define JS_ENUMERATE_ERROR_SUBCLASSES \
__JS_ENUMERATE(EvalError, eval_error, EvalErrorPrototype, EvalErrorConstructor) \
__JS_ENUMERATE(InternalError, internal_error, InternalErrorPrototype, InternalErrorConstructor) \
__JS_ENUMERATE(InvalidCharacterError, invalid_character_error, InvalidCharacterErrorPrototype, InvalidCharacterErrorConstructor) \
__JS_ENUMERATE(RangeError, range_error, RangeErrorPrototype, RangeErrorConstructor) \
__JS_ENUMERATE(ReferenceError, reference_error, ReferenceErrorPrototype, ReferenceErrorConstructor) \
__JS_ENUMERATE(SyntaxError, syntax_error, SyntaxErrorPrototype, SyntaxErrorConstructor) \