refactor

rnex-core/src/rmc/structures/rmc_struct.rs

@@ -0,0 +1,44 @@
+use std::io::{Cursor, Read, Write};
+use bytemuck::bytes_of;
+use v_byte_helpers::{IS_BIG_ENDIAN, ReadExtensions};
+use crate::rmc::structures::Error::VersionMismatch;
+use crate::rmc::structures::Result;
+
+#[repr(C, packed)]
+struct StructureHeader{
+    version: u8,
+    length: u32
+}
+
+pub fn write_struct(writer: &mut dyn Write, version: u8, pred: impl FnOnce(&mut Vec<u8>) -> Result<()> ) -> Result<()> {
+    writer.write_all(&[version])?;
+
+    let mut scratch_space: Vec<u8> = Vec::new();
+
+    (pred)(&mut scratch_space)?;
+
+    let u32_size = scratch_space.len() as u32;
+
+    writer.write_all(bytes_of(&u32_size))?;
+    writer.write_all(&scratch_space)?;
+
+    Ok(())
+}
+
+pub fn read_struct<T: Sized>(mut reader: &mut dyn Read, version: u8, pred: impl FnOnce(&mut Cursor<Vec<u8>>) -> Result<T>) -> Result<T> {
+    let ver: u8 = reader.read_struct(IS_BIG_ENDIAN)?;
+
+    if ver != version{
+        return Err(VersionMismatch(ver));
+    }
+
+    let size: u32 = reader.read_struct(IS_BIG_ENDIAN)?;
+
+    let mut vec = vec![0u8; size as usize];
+
+    reader.read_exact(&mut vec)?;
+
+    let mut cursor = Cursor::new(vec);
+
+    Ok(pred(&mut cursor)?)
+}