tftp.h

motorola 针对coldfire 5275 评估板的Dbug bootloader源程序

/*
 * File:        tftp.h
 * Purpose:     Data definitions for TFTP
 *
 * Notes:
 */

#ifndef _TFTP_H
#define _TFTP_H

/********************************************************************/

#define TFTP_RRQ            (1)
#define TFTP_WRQ            (2)
#define TFTP_DATA           (3)
#define TFTP_ACK            (4)
#define TFTP_ERROR          (5)

#define TFTP_ERR_FNF        1
#define TFTP_ERR_AV         2
#define TFTP_ERR_DF         3
#define TFTP_ERR_ILL        4
#define TFTP_ERR_TID        5
#define TFTP_FE             6
#define TFTP_NSU            7
#define TFTP_ERR_UD         0

#define OCTET               "octet"
#define NETASCII            "netascii"

/* Protocol Header information */
#define TFTP_HDR_OFFSET     (ETH_HDR_LEN + IP_HDR_SIZE + UDP_HDR_SIZE)

/* Timeout in seconds */
#define TFTP_TIMEOUT        2

/* Maximum TFTP Packet Size (payload only - no header) */
#define TFTP_PKTSIZE        512

/* Number of TFTP Data Buffers */
#define NUM_TFTPBD          6

/********************************************************************/

/* Data Buffer Pointer Structure */
typedef struct
{
    uint8   data[TFTP_PKTSIZE];
    uint16  bytes;
} DATA_BUF;

/* TFTP RRQ/WRQ Packet */
typedef struct
{
    uint16  opcode;
    char    filename_mode[TFTP_PKTSIZE - 2];
} RWRQ;

/* TFTP DATA Packet */
typedef struct 
{
    uint16  opcode;
    uint16  blocknum;
    uint8   data[TFTP_PKTSIZE - 4];
} DATA;

/* TFTP Acknowledge Packet */
typedef struct
{
    uint16  opcode;
    uint16  blocknum;
} ACK;

/* TFTP Error Packet */
typedef struct
{
    uint16  opcode;
    uint16  code;
    char    msg[TFTP_PKTSIZE - 4];
} ERROR;

/* TFTP Generic Packet */
typedef struct
{
    uint16 opcode;
} GEN;

union TFTPpacket
{
    RWRQ    rwrq;
    DATA    data;
    ACK     ack;
    ERROR   error;
    GEN     generic;
};

/* TFTP Connection Status */
typedef struct
{
    /* Pointer to next character in buffer ring */
    uint8 *next_char;

    /* Direction of current connection, read or write */
    uint8 dir;

    /* Connection established flag */
    uint8 open;

    /* Pointer to our Network InterFace */
    NIF *nif;

    /* File being transferred */
    char *file;
    
    /* Server IP address */
    IP_ADDR server_ip;

    /* Queue to hold the TFTP packets */
    QUEUE queue;

    /* Bytes received counter */
    uint32 bytes_recv;

    /* Bytes sent counter */
    uint32 bytes_sent;

    /* Bytes remaining in current Rx buffer */
    uint32 rem_bytes;

    /* Server UDP port */
    uint16  server_port;
    
    /* My UDP port */
    uint16  my_port;
    
    /* Expected TFTP block number */
    uint16 exp_blocknum;

    /* Keep track of the last packet acknowledged */
    uint16 last_ack;

    /* Error Flag */
    uint8 error;

} TFTP_Connection;


/********************************************************************/

void    tftp_handler(NIF *, NBUF *) ;
int     tftp_write (NIF *, char *, IP_ADDR_P, uint32, uint32);
int     tftp_read(NIF *, char *, IP_ADDR_P);
void    tftp_end(int);
int     tftp_in_char(void);

/********************************************************************/

#endif  /* _TFTP_H */