OMG Common Data Representation (CDR) serialization with Serde

Used by RustDDS and ros2-client.

See Wikipedia or specification in Section "9.3 CDR Transfer Syntax".

This is also a part of the full XTYPES specification. XTYPES specifies several encodings, of which this implemention is only for "plain" CDR.

lib.rs:

OMG Common Data Representation (CDR) serialization with Serde See Wikipedia or specification in Section "9.3 CDR Transfer Syntax".

Full XTYPES specification, which covers a lot more. This implemention is only for "plain" CDR.

Example

 use cdr_encoding::*;
 use serde::{Serialize, Deserialize};
 use byteorder::LittleEndian;

 // This example is originally from https://www.omg.org/spec/DDSI-RTPS/2.3/PDF
 // 10.7 Example for User-defined Topic Data
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq)]
 struct ShapeType {
   color: String,
   x: i32,
   y: i32,
   size: i32,
 }

 let message = ShapeType {
   color: "BLUE".to_string(),
   x: 34,
   y: 100,
   size: 24,
 };

 let expected_serialized_result: Vec<u8> = vec![
   0x05, 0x00, 0x00, 0x00, 0x42, 0x4c, 0x55, 0x45, 0x00, 0x00, 0x00, 0x00, 0x22, 0x00, 0x00,
   0x00, 0x64, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00,
 ];

 let serialized = to_vec::<ShapeType, LittleEndian>(&message).unwrap();
 assert_eq!(serialized, expected_serialized_result);

 let (deserialized_message, _consumed_byte_count)
   = from_bytes::<ShapeType, LittleEndian>(&serialized).unwrap();
 assert_eq!(deserialized_message, message);