Add definitions and structures for o65 files

These can be used to read and parse o65 files.

sw/o65.h

@@ -0,0 +1,65 @@
+#ifndef _O65_H
+#define _O65_H
+
+#include <stdint.h>
+
+#define O65_NON_C64 0x0001
+#define O65_MAGIC_0 0x6f
+#define O65_MAGIC_1 0x36
+#define O65_MAGIC_2 0x35
+
+#define O65_OPT_FILENAME 0
+#define O65_OPT_OS 1
+#define O65_OPT_ASSEMBLER 2
+#define O65_OPT_AUTHOR 3
+#define O65_OPT_DATE 4
+
+#define O65_OS_OSA65 1
+#define O65_OS_LUNIX 2
+#define O65_OS_CC65 3
+#define O65_OS_OPENCBM 4
+#define O65_OS_SUPER6502 5
+
+typedef union {
+    struct {
+        int cpu : 1;
+        int reloc : 1;
+        int size : 1;
+        int obj : 1;
+        int simple : 1;
+        int chain : 1;
+        int bsszero : 1;
+        int cpu2 : 4;
+        int align : 2;
+    };
+    uint16_t _mode;
+} o65_mode_t;
+
+typedef struct {
+    uint16_t c64_marker;
+    uint8_t magic[3];
+    uint8_t version;
+
+    o65_mode_t mode;
+
+    uint16_t tbase;
+    uint16_t tlen;
+    uint16_t dbase;
+    uint16_t dlen;
+    uint16_t bbase;
+    uint16_t blen;
+    uint16_t zbase;
+    uint16_t zlen;
+    uint16_t stack;
+
+} o65_header_t;
+
+typedef struct {
+    uint8_t olen;
+    uint8_t type;
+    uint8_t data[1];    //This is actually variable length
+} o65_opt;
+
+#endif
+
+