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Exploit Rust's str representation to allow 16 inline bytes for EcoString #44

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cactusdualcore opened this issue Dec 8, 2024 · 1 comment
Open

Exploit Rust's str representation to allow 16 inline bytes for EcoString #44

cactusdualcore opened this issue Dec 8, 2024 · 1 comment

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@cactusdualcore
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The compact_string crate manages to store a string with length 24 inline by using that all strings in Rust are UTF8 encoded.

This isn't really an important thing to do, because most applications will either have strings with a length much greater than 16 or much less than 15. Just wanted to point out that it's possible.
@laurmaedje
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I don't think it works for ecow because we already use a full bit of the last byte to distinguish heap vs inline. CompactStr, having 24 bytes rather than 16 bytes, always has a single byte value rather than half of a byte's range for the heap case.

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@laurmaedje @cactusdualcore