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common: Add a generic read_data() call.

master
Solomon Peachy 2013-12-21 22:39:15 -05:00
parent 875ebd2d76
commit db65d25feb
2 changed files with 33 additions and 0 deletions
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31
backend_common.c
View File

@ -84,6 +84,37 @@ done:
return buf;
}
int read_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int buflen, int *readlen)
{
int ret;
/* Clear buffer */
memset(buf, buflen, 0);
ret = libusb_bulk_transfer(dev, endp,
buf,
buflen,
readlen,
5000);
if (ret < 0) {
ERROR("Failure to receive data from printer (libusb error %d: (%d/%d from 0x%02x))\n", ret, *readlen, buflen, endp);
goto done;
}
if (dyesub_debug) {
int i;
DEBUG("<- ");
for (i = 0 ; i < *readlen; i++) {
DEBUG2("%02x ", *(buf+i));
}
DEBUG2("\n");
}
done:
return ret;
}
int send_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int len)

2
backend_common.h
View File

@ -130,6 +130,8 @@ struct dyesub_backend {
/* Exported functions */
int send_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int len);
int read_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int buflen, int *readlen);
/* Exported data */
extern int terminate;