From a77afb9b7d8d3e0977d95a35a76ae2e55cbdde18 Mon Sep 17 00:00:00 2001
From: Anatoli Arkhipenko <arkhipenko@hotmail.com>
Date: Sat, 12 Aug 2023 21:55:55 -0400
Subject: [PATCH] fix: division by zero. header read validation

---
 EDB.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/EDB.cpp b/EDB.cpp
index a4c4115..c63a3a3 100644
--- a/EDB.cpp
+++ b/EDB.cpp
@@ -86,7 +86,7 @@ EDB_Status EDB::open(unsigned long head_ptr)
   // Thanks to Steve Kelly for the next line...
   EDB_table_ptr = sizeof(EDB_Header) + EDB_head_ptr; // this line was originally missing in the downloaded library
   readHead();
-  return EDB_OK;
+  return (EDB_head.flag == EDB_FLAG ? EDB_OK : EDB_ERROR);
 }
 
 // writes a record to a given recno
@@ -172,6 +172,9 @@ unsigned long EDB::count()
 // returns the maximum number of items that will fit into the queue
 unsigned long EDB::limit()
 {
+
+   // in case of currept db, the record len could be a zero
+   if ( EDB_head.rec_size == 0 ) return 0;
    // Thanks to oleh.sok...@gmail.com for the next line
    return (EDB_head.table_size - sizeof(EDB_Header)) / EDB_head.rec_size;
 }