protocol.h


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#include <stdint.h>  // Provides uint8_t, int8_t, etc.

// client to server messages (commands)

struct Hello {
    uint8_t commandType; // 0
    uint16_t udpPort;
} __attribute__((packed));
struct SetStation {
    uint8_t commandType; // 1
    uint16_t stationNumber;
} __attribute__((packed));

struct ListStations {
    uint8_t commandType; // 5
} __attribute__((packed));

// server to client message (replies)
struct Welcome {
    uint8_t replyType; // 2
    uint16_t numStations;
} __attribute__((packed));

struct Announce {
    uint8_t replyType; // 3
    uint8_t songnameSize;
    char *songname;
} __attribute__((packed));

struct InvalidCommand {
    uint8_t replyType; // 4
    uint8_t replyStringSize;
    char *replyString;
} __attribute__((packed));

struct StationInfo {
    uint8_t replyType; // 6
    uint8_t infoStringSize;
    char *infoString;
} __attribute__((packed));


int send_all(int sock, char *buf, int *len);
int recv_all(int sock, char *buf, int *len);