/* tftp.h - definitions for trivial file transfer protocol */

/* TFTP Packet Op codes */
#define TFTP_RRQ   1   /* Read Request    */
#define TFTP_WRQ   2   /* Write Request   */
#define TFTP_DATA  3   /* Data Packet     */
#define TFTP_ACK   4   /* Acknowledgement */
#define TFTP_ERROR 5   /* Error           */

/* TFTP Error Codes */
#define TFTP_ERROR_NOT_DEFINED         0  /* Not defined, see error message (if any). */
#define TFTP_ERROR_FILE_NOT_FOUND      1  /* File not found.                          */
#define TFTP_ERROR_ACCESS_VIOLATION    2  /* Access violation.                        */
#define TFTP_ERROR_DISK_FULL           3  /* Disk full or allocation exceeded.        */
#define TFTP_ERROR_ILLEGAL_OP          4  /* Illegal TFTP operation.                  */
#define TFTP_ERROR_UNKNOWN_TRANSFER_ID 5  /* Unknown transfer ID.                     */
#define TFTP_ERROR_FILE_EXISTS         6  /* File already exists.                     */
#define TFTP_ERROR_NO_SUCH_USER        7  /* No such user.                            */

#define TFTP_PORT       69      /* UDP Port for TFTP            */
#define TFTP_MAXNAM         64      /* Max length of a file name    */
#define TFTP_MAXDATA    512     /* Max size of a data packet    */
#define TFTP_MAXRETRIES 3       /* Number of retranmissions     */
#define TFTP_WAIT       5000    /* Time to wait for reply (ms)  */

/* Xinu Specific Flags */
#define TFTP_NON_VERBOSE 0  /* Do not use verbose output */
#define TFTP_VERBOSE     1  /* Use verbose output        */

/* Format of a TFTP message (items following opcode depend on msg type) */

#pragma pack(1)
struct  tftp_msg {
        uint16          tf_opcode;      /* One of the opcodes above     */
        union {

         /* Items in a RRQ or WRQ message */

         struct {
          char  tf_filemode[TFTP_MAXNAM+10]; /* file name and mode      */
         };

         /* Items in a Data packet */

         struct {
          uint16        tf_dblk;        /* Block number of this data    */
          char          tf_data[TFTP_MAXDATA]; /* Actual data           */
         };

         /* Items in an ACK packet */

         struct {
          uint16        tf_ablk;        /* Block number being acked     */
         };

        /* Items in an Error packet */

         struct {
          uint16        tf_ercode;      /* Integer error code           */
          char          tf_ermsg[TFTP_MAXDATA]; /* Error message        */
         };
        };
};
#pragma pack()

status tftpget(uint32 serverip, const char* filename, char* rcv_buf, uint32 rcv_buf_size, byte verbose);
status tftpget_mb(uint32 serverip, const char* filename, char** rcv_bufs, uint32* rcv_buf_sizes, uint32 rcv_buf_count, byte verbose);