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#include "xmodem.h"
#include <termios.h>
#include <sys/mman.h>
#define X_STX 0x02
#define X_ACK 0x06
#define X_NAK 0x15
#define X_EOF 0x04
#define min(a, b) ((a) < (b) ? (a) : (b))
struct xmodem_chunk {
uint8_t start;
uint8_t block;
uint8_t block_neg;
uint8_t payload[1024];
uint16_t crc;
} __attribute__((packed));
#define CRC_POLY 0x1021
int outputFd;
int writeAndIntercept(int fd, const void* buf, size_t count) {
return write(fd, buf, count);
}
static uint16_t crc_update(uint16_t crc_in, int incr) {
uint16_t xor = crc_in >> 15;
uint16_t out = crc_in << 1;
if (incr)
out++;
if (xor)
out ^= CRC_POLY;
return out;
}
static uint16_t crc16(const uint8_t* data, uint16_t size) {
uint16_t crc, i;
for (crc = 0; size > 0; size--, data++)
for (i = 0x80; i; i >>= 1)
crc = crc_update(crc, *data & i);
for (i = 0; i < 16; i++)
crc = crc_update(crc, 0);
return crc;
}
static uint16_t swap16(uint16_t in) {
return (in >> 8) | ((in & 0xff) << 8);
}
int xymodem_send(int serial_fd, const char* filename, int protocol, int wait) {
size_t len;
int ret, fd;
uint8_t answer;
struct stat stat;
const uint8_t* buf;
uint8_t eof = X_EOF;
struct xmodem_chunk chunk;
int skip_payload = 0;
fd = open(filename, O_RDONLY);
if (fd < 0) {
perror("open");
return -errno;
}
fstat(fd, &stat);
len = stat.st_size;
buf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (!buf) {
perror("mmap");
return -errno;
}
if (wait) {
printf("Waiting for receiver ping ...");
fflush(stdout);
do {
ret = read(serial_fd, &answer, sizeof(answer));
if (ret != sizeof(answer)) {
perror("read");
return -errno;
}
} while (answer != 'C');
printf("done.\n");
}
printf("Sending %s ", filename);
if (protocol == PROTOCOL_YMODEM) {
strncpy((char*)chunk.payload, filename, sizeof(chunk.payload));
chunk.block = 0;
skip_payload = 1;
} else {
chunk.block = 1;
}
chunk.start = X_STX;
while (len) {
printf("block block: %d", chunk.block);
size_t z = 0;
int next = 0;
char status;
if (!skip_payload) {
z = min(len, sizeof(chunk.payload));
memcpy(chunk.payload, buf, z);
memset(chunk.payload + z, 0x1a, sizeof(chunk.payload) - z);
} else {
skip_payload = 0;
}
chunk.crc = swap16(crc16(chunk.payload, sizeof(chunk.payload)));
chunk.block_neg = 0xff - chunk.block;
ret = writeAndIntercept(serial_fd, &chunk, sizeof(chunk));
if (ret != sizeof(chunk))
return -errno;
ret = read(serial_fd, &answer, sizeof(answer));
if (ret != sizeof(answer))
return -errno;
switch (answer) {
case X_NAK:
status = 'N';
break;
case X_ACK:
status = '.';
next = 1;
break;
default:
status = answer;
break;
}
printf("%c", status);
fflush(stdout);
if (next) {
chunk.block++;
len -= z;
buf += z;
}
}
ret = writeAndIntercept(serial_fd, &eof, sizeof(eof));
if (ret != sizeof(eof))
return -errno;
/* send EOT again for YMODEM */
if (protocol == PROTOCOL_YMODEM) {
ret = writeAndIntercept(serial_fd, &eof, sizeof(eof));
if (ret != sizeof(eof))
return -errno;
}
printf("done.\n");
return 0;
}
int open_serial(const char* path, int baud) {
struct termios tty;
int fd = open(path, O_RDWR | O_SYNC);
if (fd < 0) {
perror("open");
return -errno;
}
memset(&tty, 0, sizeof(tty));
if (tcgetattr(fd, &tty) != 0) {
perror("tcgetattr");
return -errno;
}
cfsetospeed(&tty, baud);
cfsetispeed(&tty, baud);
tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
tty.c_iflag &= ~IGNBRK; // disable break processing
tty.c_lflag = 0; // no signaling chars, no echo,
// no canonical processing
tty.c_oflag = 0; // no remapping, no delays
tty.c_cc[VMIN] = 1; // read doesn't block
tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
tty.c_cflag |= (CLOCAL | CREAD); // ignore modem controls,
// enable reading
tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
tty.c_cflag &= ~CSTOPB;
tty.c_cflag &= ~CRTSCTS;
if (tcsetattr(fd, TCSANOW, &tty) != 0) {
perror("tcsetattr");
return -errno;
}
return fd;
}
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