Add invalid data test for EXD

src/exd.rs

@@ -211,3 +211,36 @@ impl EXD {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::fs::read;
+    use std::path::PathBuf;
+    use crate::exh::EXHHeader;
+
+    use super::*;
+
+    #[test]
+    fn test_invalid() {
+        let mut d = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+        d.push("resources/tests");
+        d.push("random");
+
+        let exh = EXH {
+            header: EXHHeader {
+                version: 0,
+                data_offset: 0,
+                column_count: 0,
+                page_count: 0,
+                language_count: 0,
+                row_count: 0,
+            },
+            column_definitions: vec![],
+            pages: vec![],
+            languages: vec![],
+        };
+
+        // Feeding it invalid data should not panic
+        EXD::from_existing(&exh, &read(d).unwrap());
+    }
+}

src/exh.rs

@@ -14,12 +14,12 @@ use crate::ByteSpan;
 #[brw(big)]
 #[allow(dead_code)]
 pub struct EXHHeader {
-    version: u16,
+    pub(crate) version: u16,
 
     pub data_offset: u16,
-    column_count: u16,
-    page_count: u16,
-    language_count: u16,
+    pub(crate) column_count: u16,
+    pub(crate) page_count: u16,
+    pub(crate) language_count: u16,
 
     #[br(pad_before = 6)]
     #[br(pad_after = 8)]