[parser] add MissingMetaElement error variant

Author: Enet4

parser/src/error.rs

@@ -19,6 +19,10 @@ quick_error! {
         InvalidFormat {
             description("Content is not DICOM or is corrupted")
         }
+        /// A required element in the meta group is missing
+        MissingMetaElement(name: &'static str) {
+            display("Missing required meta element `{}`", name)
+        }
         /// Raised when the obtained data element was not the one expected.
         UnexpectedTag(tag: Tag) {
             description("Unexpected DICOM element tag in current reading position")

parser/src/lib.rs

@@ -7,7 +7,7 @@
 //!
 //! For a more intuitive, object-oriented API, please see the `dicom-object`
 //! crate.
-#![recursion_limit = "80"]
+#![recursion_limit = "90"]
 
 pub mod dataset;
 pub mod error;