isQOI() doesn't give strong confirmation that decoding a sequence of bytes won't fail.

[magnus-ISU]

It really only checks that the header is correct and that the sequence of bytes isn't longer than the header claims.

Since decoding a QOI image only takes one pass, this is probably the correct implementation. However, the documentation makes no mention that isQOI doesn't guarantee that its input actually is a Quite Okay Image.

[ikskuh]

Ah, good point 👍
I'll improve the comment (and API) of the library soon. I wanna expose a pure stream encoder/decoder as well, where you have zero allocations involved