[Webkit-unassigned] [Bug 258789] New: atob() clones the output more than necessary

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258789

            Bug ID: 258789
           Summary: atob() clones the output more than necessary
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jarred at jarredsumner.com

From: https://github.com/WebKit/WebKit/blob/de456d04c10080ce71f48d14b3a9d278854d5f8a/Source/WebCore/page/Base64Utilities.cpp#L53


    auto decodedData = base64Decode(encodedString, Base64DecodeMode::DefaultValidatePaddingAndIgnoreWhitespace);
    if (!decodedData)
        return Exception { InvalidCharacterError };

    return String(decodedData->data(), decodedData->size());


String(const char*, unsigned) calls StringImpl::create(reinterpret_cast<const LChar*>(ptr), length).

This is an extra clone, from the Vector<uint8_t> -> StringImpl. Seems like moving the Vector would also clone it.

Possible suggestions:
- base64Decode could have a template arg to use WTF::StringBuilder?
- Maybe there's a way using ExternalStringImpl?

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