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Introduce new enum: Viewtype

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With this change, kind of message is represented by value of enum
`Viewtype' instead of raw libc::c_int, providing more type safety. This
enum replaces DC_MSG_* constants. The only way to create `Viewtype' from
libc::c_int is smart constructor.

With this change, functions `dc_get_chat_media' and `dc_get_next_media' became
less forgiving about invalid message type arguments. Previously, invalid
message types were implicitly interpreted as 0 (Viewtype::Unknown). Now,
function calls with invalid message type arguments are rejected (error code
returned) on FFI boundary.

Additionally, when `Viewtype' is read from database, it is checked to have
sensible value.

No tests assumed forgiving behaviour.
This commit is contained in:
Dmitry Bogatov
2019-07-29 01:58:42 +00:00
parent e7456248a0
commit c04c8ff103
12 changed files with 219 additions and 135 deletions
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Cargo.lock generated
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@@ -507,6 +507,7 @@ dependencies = [
"deltachat 1.0.0-alpha.3",
"human-panic 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
"libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
"num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
]
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