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tftp.c: use symbolic constants for protocol opcodes

This commit is contained in:
Werner Almesberger 2013-04-16 13:55:21 -03:00 committed by Sebastien Bourdeauducq
parent 65b807b63f
commit 36613c7955
1 changed files with 14 additions and 5 deletions
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19
software/bios/tftp.c
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@ -6,10 +6,18 @@
#define PORT_OUT 69
#define PORT_IN 7642
enum {
TFTP_RRQ = 1, /* Read request */
TFTP_WRQ = 2, /* Write request */
TFTP_DATA = 3, /* Data */
TFTP_ACK = 4, /* Acknowledgment */
TFTP_ERROR = 5, /* Error */
};
static int format_request(char *buf, const char *filename)
{
*buf++ = 0x00; /* Opcode: Request */
*buf++ = 0x01;
*buf++ = TFTP_RRQ;
strcpy(buf, filename);
buf += strlen(filename);
*buf++ = 0x00;
@ -25,7 +33,7 @@ static int format_request(char *buf, const char *filename)
static int format_ack(char *buf, unsigned short block)
{
*buf++ = 0x00; /* Opcode: Ack */
*buf++ = 0x04;
*buf++ = TFTP_ACK;
*buf++ = (block & 0xff00) >> 8;
*buf++ = (block & 0x00ff);
return 4;
@ -36,7 +44,8 @@ static int total_length;
static int transfer_finished;
static char *dst_buffer;
static void rx_callback(unsigned int src_ip, unsigned short src_port, unsigned short dst_port, void *_data, unsigned int length)
static void rx_callback(unsigned int src_ip, unsigned short src_port,
unsigned short dst_port, void *_data, unsigned int length)
{
unsigned char *data = (unsigned char *)_data;
unsigned short opcode;
@ -49,7 +58,7 @@ static void rx_callback(unsigned int src_ip, unsigned short src_port, unsigned s
opcode = ((unsigned short)(data[0]) << 8)|((unsigned short)(data[1]));
block = ((unsigned short)(data[2]) << 8)|((unsigned short)(data[3]));
if(block < 1) return;
if(opcode == 3) { /* Data */
if(opcode == TFTP_DATA) { /* Data */
length -= 4;
offset = (block-1)*512;
for(i=0;i<length;i++)
@ -61,7 +70,7 @@ static void rx_callback(unsigned int src_ip, unsigned short src_port, unsigned s
length = format_ack(packet_data, block);
microudp_send(PORT_IN, src_port, length);
}
if(opcode == 5) { /* Error */
if(opcode == TFTP_ERROR) { /* Error */
total_length = -1;
transfer_finished = 1;
}