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diff --git a/src/fileio.cpp b/src/fileio.cpp
new file mode 100644
index 0000000..cb0fa72
--- /dev/null
+++ b/src/fileio.cpp
@@ -0,0 +1,28 @@
+//
+// fileio.cpp: File I/O functions
+//
+// by James Hammons
+// (C) 2023 Underground Software
+//
+
+#include "fileio.h"
+
+uint32_t ReadLong(FILE * file)
+{
+	uint32_t r = 0;
+
+	for(int i=0; i<4; i++)
+		r = (r << 8) | fgetc(file);
+
+	return r;
+}
+
+void WriteLong(FILE * file, uint32_t l)
+{
+	for(int i=0; i<4; i++)
+	{
+		fputc((l >> 24) & 0xFF, file);
+		l = l << 8;
+	}
+}
+