diff --git a/isofix.h b/isofix.h
new file mode 100644
index 0000000..64abce1
--- /dev/null
+++ b/isofix.h
@@ -0,0 +1,24 @@
+#ifdef __linux__
+  #define stricmp strcasecmp
+#endif
+
+
+typedef enum bool_t { false, true } bool;
+
+struct opts_s {
+              bool last_vd;
+              bool askforimage;
+              bool extractbootonly;
+              bool extractheaderonly;
+              bool macformat;
+              bool isoformat;
+              };
+
+static const char PVD_STRING[8] = { 0x01, 0x43, 0x44, 0x30, 0x30, 0x31, 0x01, 0 }; //"\x01" "CD001" "\x01" "\0";
+static const char SVD_STRING[8] = { 0x02, 0x43, 0x44, 0x30, 0x30, 0x31, 0x01, 0 }; //"\x02" "CD001" "\x01" "\0";
+static const char VDT_STRING[8] = { 0xff, 0x43, 0x44, 0x30, 0x30, 0x31, 0x01, 0 }; //"\xFF" "CD001" "\x01" "\0";
+static const char SYNC_DATA[12] = { 0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0 };
+static const char SUB_HEADER[8] = { 0, 0, 0x08, 0, 0, 0, 0x08, 0 };
+
+int seek_pvd(char *buffer, int sector_size, int mode, FILE *fsource);
+int sector_read(char *buffer, int sector_size, int mode, FILE *fsource);