[bug][bindgen] ArrayShape read corrupts the reader

[youyuanwu]

Summary

I am experimenting scraping c headers into winmd and use windows-bindgen to generate bindings from winmd here: youyuanwu/bnd. There is a discrepancy between metadata and bindgen for treating ArrayShape, which causes reader corruption and panic for reading elsewhere.

ArrayShape write in metadata crate writes 4 bytes:

windows-rs/crates/libs/metadata/src/writer/file/mod.rs

Line 426 in 65c0c07

buffer.write_compressed(1); // rank

While read in bindgen crate read 3 bytes:

windows-rs/crates/libs/bindgen/src/types/mod.rs

Line 310 in 65c0c07

ELEMENT_TYPE_ARRAY => {

#3892 attempted to fix this but there is further plan to change windows-bindgen crate, so it is not merged.

Crate manifest

Crate code