Index: trunk/include/platform.h
===================================================================
--- trunk/include/platform.h	(revision 1024)
+++ trunk/include/platform.h	(revision 1101)
@@ -541,4 +541,16 @@
 void init_chdk_ptp_task();
 
+typedef struct {
+    unsigned size;
+    unsigned script_id; // id of script message is to/from 
+    unsigned type;
+    unsigned subtype;
+    char data[];
+} ptp_script_msg;
+int ptp_script_write_msg(ptp_script_msg *msg);
+ptp_script_msg* ptp_script_read_msg(void);
+ptp_script_msg* ptp_script_create_msg(unsigned type, unsigned subtype, unsigned datasize, const void *data);
+int ptp_script_write_error_msg(unsigned errtype, const char *err);
+
 #endif // CAM_CHDK_PTP