specctra: some DSN files use 'PCB' instead of 'pcb'

src/specctra/structure.rs

@@ -44,11 +44,23 @@ pub struct NetOut {
     pub via: Vec<Via>,
 }
 
-#[derive(ReadDsn, WriteSes, Debug)]
+#[derive(WriteSes, Debug)]
 pub struct DsnFile {
     pub pcb: Pcb,
 }
 
+impl<R: std::io::BufRead> ReadDsn<R> for DsnFile {
+    fn read_dsn(tokenizer: &mut ListTokenizer<R>) -> Result<Self, ParseError> {
+        let mut pcb_type_name = tokenizer.consume_token()?.expect_any_start()?;
+        if !pcb_type_name.eq_ignore_ascii_case("pcb") {
+            return Err(ParseError::ExpectedStartOfList("pcb"));
+        }
+        let pcb = tokenizer.read_value::<Pcb>()?;
+        tokenizer.consume_token()?.expect_end()?;
+        Ok(Self { pcb })
+    }
+}
+
 #[derive(ReadDsn, WriteSes, Debug)]
 pub struct Pcb {
     #[anon]