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Fix: division by zero. header read validation #43

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Fix: division by zero. header read validation #43

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5 changes: 4 additions & 1 deletion EDB.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down Expand Up @@ -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;
}
Expand Down