feat: implement a full SSV_LireConfig output parsing, using deku for a declarative bytes parsing

Co-authored-by: theo <t.lettermann@criteo.com>

crates/fsv/src/ssv/mod.rs

@@ -122,30 +122,30 @@ impl SSV {
     /// # Get the configuration of the SSV library
     /// Implement: SSV_LireConfig
     pub fn get_config(&self) -> Result<Data, Error> {
-        let mut buffer_ptr: *mut libc::c_void = ptr::null_mut();
+        let mut out_buffer_ptr: *mut libc::c_void = ptr::null_mut();
-        let mut size: libc::size_t = 0;
+        let mut out_buffer_size: libc::size_t = 0;
 
         let result = match &self.library {
             SsvLibraryVersion::V1_40_13(library) => {
-                unsafe { library.ssv_lire_config(&mut buffer_ptr, &mut size) }?
+                unsafe { library.ssv_lire_config(&mut out_buffer_ptr, &mut out_buffer_size) }?
             },
             SsvLibraryVersion::V1_40_14(library) => {
-                unsafe { library.ssv_lire_config(&mut buffer_ptr, &mut size) }?
+                unsafe { library.ssv_lire_config(&mut out_buffer_ptr, &mut out_buffer_size) }?
             },
         };
 
         if result != 0 {
             // Free memory
-            unsafe { libc::free(buffer_ptr) };
+            unsafe { libc::free(out_buffer_ptr) };
             let error = SSVErrorCodes::from(result);
             return Err(Error::SSVError(error));
         }
-        // Print the buffer
+        // Parse the buffer into a Data struct
-        let buffer = unsafe { std::slice::from_raw_parts(buffer_ptr as *const u8, size) };
+        let buffer = unsafe { std::slice::from_raw_parts(out_buffer_ptr as *const u8, out_buffer_size) };
         let (_rest, config_blocks) = Data::from_bytes((buffer, 0)).unwrap();
 
         // Free memory
-        unsafe { libc::free(buffer_ptr) };
+        unsafe { libc::free(out_buffer_ptr) };
         Ok(config_blocks)
     }  
 }