USBBoot C

//
//  main.c
//  usbBoot
//
//  Created by Vlad Victor Ungureanu on 6/11/13.
//  Copyright (c) 2013 Vlad Victor Ungureanu. All rights reserved.
//

#include <stdio.h>
#include <stdlib.h>
#include <libusb.h>

int main(int argc, const char * argv[]) {
    libusb_device **devs; //pointer to pointer of device, used to retrieve a list of devices
    libusb_device_handle *dev_handle; //a device handle
    libusb_context *ctx = NULL; //a libusb session
    int r; //for return values
    ssize_t cnt; //holding number of devices in list
    r = libusb_init(&ctx); //initialize the library for the session we just declared
    if(r < 0) {
        printf("Init error!\n");
        return 1;
    }
    libusb_set_debug(ctx, 3); //set verbosity level to 3, as suggested in the documentation

    cnt = libusb_get_device_list(ctx, &devs); //get the list of devices
    if(cnt < 0) {
        printf("Cannot get device list!\n");
        return 1;
    }
    printf("%zd devices in list!\n",cnt);

    dev_handle = libusb_open_device_with_vid_pid(ctx, 0x0451, 0x6141); //these are vendorID and productID I found for my usb device
    if(dev_handle == NULL) {
        printf("Cannot open device!\n");
        return 1;
    }
    else
        printf("Device opened!\n");
    libusb_free_device_list(devs, 1); //free the list, unref the devices in it

    unsigned char *data = (unsigned char*)malloc(64*sizeof(unsigned char));

    int actual; //used to find out how many bytes were written
    if(libusb_kernel_driver_active(dev_handle, 0) == 1) { //find out if kernel driver is attached
        printf("Kernel has driver!\n");
        if(libusb_detach_kernel_driver(dev_handle, 0) == 0) //detach it
            printf("Kernel deattached!\n!");
    }
    r = libusb_claim_interface(dev_handle, 0); //claim interface 0 (the first) of device (mine had jsut 1)
    if(r < 0) {
        printf("Cannot Claim Interface!\n");
        return 1;
    }
    printf("Claimed interface!\n");

    r = libusb_bulk_transfer(dev_handle, (129 | LIBUSB_ENDPOINT_IN), data, 64, &actual, 0); //my device's out endpoint was 2, found with trial- the device had 2 endpoints: 2 and 129
    while(r==0) {
        int i;
        for(i = 0; i<63; i++)printf("%c ",data[i]);
        r = libusb_bulk_transfer(dev_handle, (129 | LIBUSB_ENDPOINT_IN), data, 64, &actual, 0);
    }
    r = libusb_release_interface(dev_handle, 0); //release the claimed interface
    if(r!=0) {
        printf("Cannot release interface!\n");
        return 1;
    }

    libusb_close(dev_handle); //close the device we opened
    libusb_exit(ctx); //needs to be called to end the

    free(data); //delete the allocated memory for data
    return 0;
}