Avoid panic when book text content is empty

As mentioned in the README, the generated book will most likely still be malformed, but at least the panic can be fixed.
leotaku · Oct 28, 2023 · aba409b · aba409b
1 parent 7d62d03
commit aba409b
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/mobi.go b/mobi.go
@@ -117,7 +117,10 @@ func (m Book) Realize() pdb.Database {
 	}
 
 	// Padding
-	lastLength := textRecords[len(textRecords)-1].Length()
+	lastLength := 0
+	if len(textRecords) > 0 {
+		lastLength = textRecords[len(textRecords)-1].Length()
+	}
 	if lastLength%4 != 0 {
 		pad := make(pdb.RawRecord, lastLength%4)
 		db.AddRecord(pad)