feat: trait FromByte add SIZE

Author: Yvictor

Cargo.lock

@@ -22,7 +22,7 @@ resolver = "2"
 
 [workspace.package]
 authors = ["Yvictor <[email protected]>"]
-version = "0.1.12"
+version = "0.1.13"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/Yvictor/binary_mirror"

Cargo.toml

@@ -974,8 +974,10 @@ fn impl_binary_mirror(input: &DeriveInput) -> TokenStream {
         #native_struct_code
 
         impl binary_mirror::FromBytes for #name {
+            const SIZE: usize = std::mem::size_of::<Self>();
+
             fn from_bytes(bytes: &[u8]) -> Result<&Self, binary_mirror::BytesSizeError> {
-                let expected = Self::size();
+                let expected = Self::SIZE;
                 let actual = bytes.len();
                 if actual != expected {
                     return Err(binary_mirror::BytesSizeError::new(

binary-mirror-derive/src/lib.rs

@@ -857,4 +857,5 @@ fn test_skipped_fields() {
     let raw2 = native2.to_raw();
     assert_eq!(raw.to_bytes(), raw2.to_bytes());
     assert_eq!(WithSkippedFields::size(), 34);
+    assert_eq!(WithSkippedFields::SIZE, 34);
 }

binary-mirror-derive/tests/derive_tests.rs

@@ -53,6 +53,9 @@ pub struct FieldSpec {
 }
 
 pub trait FromBytes: Sized {
+    /// Get the size of the struct in bytes
+    const SIZE: usize;
+
     /// Create a new instance from bytes
     /// Returns Err if the bytes length doesn't match the struct size
     fn from_bytes(bytes: &[u8]) -> Result<&Self, BytesSizeError>;