#ifndef _sia_h_
#define _sia_h_

#define SIA_TIMEOUT 3   // standard says 2.5s

#define SIA_FN_ACCOUNT_ID          0x23
#define SIA_FN_ORIGIN_ID           0x26
#define SIA_FN_END_OF_DATA         0x30
#define SIA_FN_WAIT                0x31
#define SIA_FN_ABORT               0x32
#define SIA_FN_RES_3               0x33
#define SIA_FN_RES_4               0x34
#define SIA_FN_RES_5               0x35
#define SIA_FN_ACK_AND_STANDBY     0x36
#define SIA_FN_ACK_AND_DISCONNECT  0x37
#define SIA_FN_ACKNOLEDGE          0x38
#define SIA_FN_ALT_ACKNOLEDGE      0x08 //JMM I can't imagine how someone made that mistake :)
#define SIA_FN_REJECT              0x39
#define SIA_FN_ALT_REJECT          0x09
#define SIA_FN_REMOTE_LOGIN        0x3f
#define SIA_FN_CONFIGURATION       0x40
#define SIA_FN_ASCII               0x41
#define SIA_FN_CONTROL             0x43
#define SIA_FN_ENVIRONMENTAL       0x45
#define SIA_FN_VIDEO               0x49
#define SIA_FN_LISTEN_IN           0x4c
#define SIA_FN_NEW_EVENT           0x4e
#define SIA_FN_OLD_EVENT           0x4f
#define SIA_FN_PROGRAM             0x50
#define SIA_FN_VCHN_REQUEST        0x56
#define SIA_FN_EXTENDED            0x58
#define SIA_FN_VCHN_FRAME          0x76


#define SIA_MAX_DATA_LENGTH 0x3f
#define SIA_MAX_BLOCK_LENGTH  (2 + SIA_MAX_DATA_LENGTH + 1)

typedef union {
  unsigned char block[SIA_MAX_BLOCK_LENGTH];
  struct {
    unsigned char length : 6;
    unsigned char request_ack: 1;
    unsigned char reverse_channel: 1;
    unsigned char function;
    unsigned char data[];
  };
} SIA_Block;


/* sia.c */
extern int sia_fn_valid (SIA_Block *s);
extern int sia_fn_permits_ack (unsigned char fn);
extern unsigned int sia_data_length (SIA_Block *s);
extern unsigned int sia_length (SIA_Block *s);
extern int sia_parity_valid (SIA_Block *s);
extern void sia_set_parity (SIA_Block *s);
extern ssize_t sia_write (int fd, SIA_Block *s);
extern ssize_t sia_acknoledge (int fd);
extern int sia_ack_if_needed (int fd, SIA_Block *s);
extern int sia_parse (unsigned char *buf, unsigned len, SIA_Block *b);
extern int sia_rx_with_timeout (int fd, SIA_Block *b, int timeout);
extern int sia_rx_with_timeout_ignore_log (int fd, SIA_Block *b, int timeout);
extern int sia_login (int fd, SIA_Block *b);


#endif  /* _sia_h_ */