Derive Macro serde_someip::SomeIp

#[derive(SomeIp)]
{
    // Attributes available to this derive:
    #[someip]
}

Provides #[derive(SomeIp)] requires the derive feature.

Only available with the derive feature.

Length Field Sizes

For multiple types you can specify a length_field_size this is always optional. If you provide it it must be either 1, 2 or 4 since those are the only length field sizes supported by someip. If you do not provide it and the type needs a length field size to be serialized it will be taken from the SomeIpOptions if the options also do not provide one the de/serialization will panic.

Eums

For enums you must provide a raw_type to indicate how to serialize the enum and every variant must be assigned a value that is valid for that raw_type. SomeIp only supports unit variants, so tuple and struct variants will cause a compile error.

#[derive(SomeIp)]
#[someip(raw_type = i16)]
enum Foo {
    #[someip(value = -10)]
    Bar
}

#[derive(SomeIp)]
#[someip(raw_type = i16)]
enum Foo {
    #[someip(value = -10)]
    Bar(u8)
}

Strings

For strings you must provide the max_size and can optionally provide a min_size (defaults to 0 if not present) and a length_field_size. The size is in bytes after encoding the string with the string encoding specified by SomeIpOptions. Since this can be different for every string you must provide it for every string. If you want to just serialize a string outside of a struct you must wrap it in a newtype struct.

#[derive(SomeIp)]
#[someip(max_size = 42)] //this is the mimium required attrributes
struct AString(String);

#[derive(SomeIp)]
#[someip(min_size = 10, max_size = 42, length_field_size = 2)] //this is the maximum possible attributes
struct AnotherString<'a>(&'a str);

Sequences

For Sequences you must provide the max_elements inside the sequence and can provide a min_elements (defaults to 0 if not present) and a length_field_size:

#[derive(SomeIp)]
#[someip(max_elements = 42)] //this is the mimium required attrributes
struct AVec(Vec<u32>);

#[derive(SomeIp)]
#[someip(min_elements = 10, max_elements = 42, length_field_size = 2)]
struct ASlice<'a>(&'a [u32]);

If the element type of your sequence requires additional information like for example a String does you must provide this via the elements attribute:

#[derive(SomeIp)]
#[someip(max_elements = 42, elements = (max_size = 10))] //this is the mimium required attrributes
struct AVec(Vec<String>);

Of course you can recurse elements for multidimensional arrays:

#[derive(SomeIp)]
#[someip(max_elements = 42, elements = (max_elements = 3, elements = (max_size = 10)))] //this is the mimium required attrributes
struct AVec(Vec<Vec<String>>);

Structs

Structs can have message_wrapper, length_field_size, arrays_length_field_size, structs_length_field_size and a strings_length_field_size attribute though none are required. The three xs_length_field_size attributes correspond to similarily named values in the someip transformation properties of autosar. When present these attribtues will set the length_field_sizes for all matching types used in this struct. The message_wrapper attribute indicates that this struct is a wrapper for a someip message (the parameters/return values of a function call or the data of an event) this must be considered during de/serialization since such structs must not beginn with a length field. The attributes for strings and sequences are put on the appropiate fields:

//minimal example
#[derive(SomeIp)]
struct AStruct {
    #[someip(max_size = 42)]
    foo: String,
};

//example with all possible attributes
#[derive(SomeIp)]
#[someip(
    message_wrapper = true,
    length_field_size = 2,
    arrays_length_field_size = 2,
    structs_length_field_size = 2,
    strings_length_field_size = 2
)]
struct AnotherStruct {
    #[someip(max_elements = 42)]
    foo: Vec<f64>,
};

Structs can also use the TLV encoding in which case every field must have an id which is in 0..=0xFFF and the id must be unique within the struct.

#[derive(SomeIp)]
struct AStruct {
    #[someip(id = 0)]
    foo: u32,
    #[someip(id = 1)]
    bar: Option<f64>,
};

Either all fields must have an id or none:

#[derive(SomeIp)]
struct AStruct {
    #[someip(id = 0)]
    foo: u32,
    bar: f64,
};

Options can only be used in TLV structs:

#[derive(SomeIp)]
struct AStruct {
    foo: u32,
    bar: Option<f64>,
};

treat_as

You can use treat_as to workaround types that someip does not know. For example typedefs or using the bytes crate:

use bytes::Bytes;
type ABunchOfInts = Vec<u32>;

#[derive(SomeIp)]
struct AStruct {
    #[someip(treat_as = Vec<u32>, max_elements = 32)]
    ints: ABunchOfInts,
    #[someip(treat_as = [u8], max_elements = 1024)]
    bytes: Bytes,
}

Warning: If you lie to someip about what your type is your program will panic. Use via the serde_someip crate with feature derive.