Split off the CRC code to its own module.

src/include/86box/crc.h

@@ -0,0 +1,34 @@
+/*
+ * 86Box    A hypervisor and IBM PC system emulator that specializes in
+ *          running old operating systems and software designed for IBM
+ *          PC systems and compatibles from 1981 through fairly recent
+ *          system designs based on the PCI bus.
+ *
+ *          This file is part of the 86Box distribution.
+ *
+ *          Definitions for the CRC code.
+ *
+ * Authors: Miran Grca, <mgrca8@gmail.com>
+ *
+ *          Copyright 2016-2025 Miran Grca.
+ */
+#ifndef EMU_CRC_H
+#define EMU_CRC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef union {
+    uint16_t word;
+    uint8_t  bytes[2];
+} crc_t;
+
+extern void crc16_setup(uint16_t *crc_table, uint16_t poly);
+extern void crc16_calc(uint16_t *crc_table, uint8_t byte, crc_t *crc_var);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*EMU_CRC_H*/