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- Addresses #172.
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- When we transfer ownership from C to Rust, we move the wrapped
object out of the wrapper, and poison the wrapper.
- This prevents reuse of the wrapper object. When a stale reference
is given to us, we check the tag encoding the type information.
- If the tag field is poisoned, we can produce a more helpful error
message. This is not exact, of course. As soon as the memory is
reused, our tag is overwritten.
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- This change adds a tag to the derived wrapper types that identify
the type of the wrapped value.
- At runtime, we can verify that references to wrapper objects
indeed carry the right tag.
- Fixes #166.
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- This creates a new crate, 'sequoia-openpgp-ffi', and moves a
handful of functions from 'sequoia-ffi' to it.
- The 'sequoia-ffi' crate is a superset of the 'sequoia-openpgp-ffi'
crate. This is accomplished by some include! magic.
- My first attempt involved having 'sequoia-ffi' depend on
'sequoia-openpgp-ffi', so that the former just re-exports the
symbols. However, that turned out to be unreliable, and might be
not what we want, because it could also duplicate parts of Rust's
standard library.
- Fixes #144.
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