windows/cthelper/message.h

   1 #ifndef MESSAGE_H
   2 #define MESSAGE_H
   3
   4 #if __STDC__VERSION >= 199901L
   5 #include <stdint.h>
   6 #elif defined(__INTERIX)
   7 #include <sys/types.h>
   8 #else
   9 typedef unsigned char uint8_t;
  10 typedef unsigned short uint16_t;
  11 #endif
  12
  13 typedef struct message_tag Message;
  14 struct message_tag {
  15   uint8_t size;
  16   uint8_t type;
  17   union {
  18     struct {
  19       uint16_t width, height;
  20     } resize;
  21   } msg;
  22 };
  23
  24 /* message types */
  25 #define MSG_RESIZE (21)
  26
  27 #define MESSAGE_MIN (2)
  28 #define MESSAGE_MAX (sizeof(struct message_tag))
  29
  30 /* Fills in a Message structure from `data'.  Does not attempt to validate
  31  * the message type, but returns 0 if a partial message is received.
  32  * Returns -1 if the size is impossible (bigger than largest possible
  33  * message or smaller than smallest possible message).
  34  * Returns 1 if the message structure is filled in properly.
  35  */
  36 int message_get(Message *m, const unsigned char *data, size_t len);
  37
  38 #endif /* MESSAGE_H */