lints: enable and address remaining trivial_numeric_casts

Author: ctz

Cargo.toml

@@ -18,3 +18,6 @@ rustls = "0.23.27"
 
 [dev-dependencies]
 pretty_assertions = "1"
+
+[lints.rust]
+trivial_numeric_casts = "warn"

src/entry.rs

@@ -424,7 +424,7 @@ entry! {
         protos_len: c_uint,
     ) -> MysteriouslyOppositeReturnValue {
         let ctx = try_clone_arc!(ctx);
-        let slice = try_slice!(protos, protos_len);
+        let slice = try_slice!(protos, c_uint_into_usize(protos_len));
 
         let alpn = match crate::parse_alpn(slice) {
             Some(alpn) => alpn,
@@ -689,7 +689,7 @@ entry! {
         sid_ctx: *const c_uchar,
         sid_ctx_len: c_uint,
     ) -> c_int {
-        let sid_ctx = try_slice!(sid_ctx, sid_ctx_len);
+        let sid_ctx = try_slice!(sid_ctx, c_uint_into_usize(sid_ctx_len));
         if sid_ctx.len() > SSL_MAX_SID_CTX_LENGTH {
             return Error::not_supported("excess sid_ctx_len").raise().into();
         }
@@ -937,7 +937,7 @@ entry! {
         protos_len: c_uint,
     ) -> MysteriouslyOppositeReturnValue {
         let ssl = try_clone_arc!(ssl);
-        let slice = try_slice!(protos, protos_len);
+        let slice = try_slice!(protos, c_uint_into_usize(protos_len));
 
         let alpn = match crate::parse_alpn(slice) {
             Some(alpn) => alpn,
@@ -1131,8 +1131,8 @@ entry! {
                 ERROR
             }
             Ok(result) => match result {
-                ShutdownResult::Sent => 0 as c_int,
-                ShutdownResult::Received => 1 as c_int,
+                ShutdownResult::Sent => 0,
+                ShutdownResult::Received => 1,
             },
         }
     }
@@ -1170,7 +1170,7 @@ entry! {
 
 entry! {
     pub fn _SSL_get_error(ssl: *const SSL, _ret_code: c_int) -> c_int {
-        try_clone_arc!(ssl).get_mut().get_error() as c_int
+        try_clone_arc!(ssl).get_mut().get_error()
     }
 }
 
@@ -1613,8 +1613,8 @@ entry! {
         client: *const c_uchar,
         client_len: c_uint,
     ) -> c_int {
-        let server = try_slice!(server, server_len);
-        let client = try_slice!(client, client_len);
+        let server = try_slice!(server, c_uint_into_usize(server_len));
+        let client = try_slice!(client, c_uint_into_usize(client_len));
 
         if out.is_null() || out_len.is_null() {
             return 0;
@@ -1732,7 +1732,7 @@ entry! {
         sid_ctx: *const c_uchar,
         sid_ctx_len: c_uint,
     ) -> c_int {
-        let slice = try_slice!(sid_ctx, sid_ctx_len);
+        let slice = try_slice!(sid_ctx, c_uint_into_usize(sid_ctx_len));
         if slice.len() > SSL_MAX_SID_CTX_LENGTH {
             return Error::not_supported("excess sid_ctx_len").raise().into();
         }
@@ -2480,6 +2480,13 @@ entry_stub! {
 
 // ---------------------
 
+fn c_uint_into_usize(v: c_uint) -> usize {
+    const {
+        assert!(size_of::<c_uint>() <= size_of::<usize>());
+    }
+    v as usize
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/ffi.rs

@@ -418,7 +418,7 @@ macro_rules! try_slice {
         if $ptr.is_null() {
             return $crate::error::Error::null_pointer().raise().into();
         } else {
-            unsafe { ::core::slice::from_raw_parts($ptr, $count as usize) }
+            unsafe { ::core::slice::from_raw_parts($ptr, $count) }
         }
     };
 }