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use std::marker::PhantomData;
use std::mem;
use libc::c_int;
use libusb::*;
use device_list::{self, DeviceList};
use device_handle::{self, DeviceHandle};
use error;
/// A `libusb` context.
pub struct Context {
context: *mut libusb_context,
}
impl Drop for Context {
/// Closes the `libusb` context.
fn drop(&mut self) {
unsafe {
libusb_exit(self.context);
}
}
}
unsafe impl Sync for Context {}
unsafe impl Send for Context {}
impl Context {
/// Opens a new `libusb` context.
pub fn new() -> ::Result<Self> {
let mut context = unsafe { mem::uninitialized() };
try_unsafe!(libusb_init(&mut context));
Ok(Context { context: context })
}
/// Sets the log level of a `libusb` context.
pub fn set_log_level(&mut self, level: LogLevel) {
unsafe {
libusb_set_debug(self.context, level.as_c_int());
}
}
pub fn has_capability(&self) -> bool {
unsafe {
libusb_has_capability(LIBUSB_CAP_HAS_CAPABILITY) != 0
}
}
/// Tests whether the running `libusb` library supports hotplug.
pub fn has_hotplug(&self) -> bool {
unsafe {
libusb_has_capability(LIBUSB_CAP_HAS_HOTPLUG) != 0
}
}
/// Tests whether the running `libusb` library has HID access.
pub fn has_hid_access(&self) -> bool {
unsafe {
libusb_has_capability(LIBUSB_CAP_HAS_HID_ACCESS) != 0
}
}
/// Tests whether the running `libusb` library supports detaching the kernel driver.
pub fn supports_detach_kernel_driver(&self) -> bool {
unsafe {
libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER) != 0
}
}
/// Returns a list of the current USB devices. The context must outlive the device list.
pub fn devices<'a>(&'a self) -> ::Result<DeviceList<'a>> {
let mut list: *const *mut libusb_device = unsafe { mem::uninitialized() };
let n = unsafe { libusb_get_device_list(self.context, &mut list) };
if n < 0 {
Err(error::from_libusb(n as c_int))
}
else {
Ok(unsafe { device_list::from_libusb(self, list, n as usize) })
}
}
/// Convenience function to open a device by its vendor ID and product ID.
///
/// This function is provided as a convenience for building prototypes without having to
/// iterate a [`DeviceList`](struct.DeviceList.html). It is not meant for production
/// applications.
///
/// Returns a device handle for the first device found matching `vendor_id` and `product_id`.
/// On error, or if the device could not be found, it returns `None`.
pub fn open_device_with_vid_pid<'a>(&'a self, vendor_id: u16, product_id: u16) -> Option<DeviceHandle<'a>> {
let handle = unsafe { libusb_open_device_with_vid_pid(self.context, vendor_id, product_id) };
if handle.is_null() {
None
}
else {
Some(unsafe { device_handle::from_libusb(PhantomData, handle) })
}
}
}
/// Library logging levels.
pub enum LogLevel {
/// No messages are printed by `libusb` (default).
None,
/// Error messages printed to `stderr`.
Error,
/// Warning and error messages are printed to `stderr`.
Warning,
/// Informational messages are printed to `stdout`. Warnings and error messages are printed to
/// `stderr`.
Info,
/// Debug and informational messages are printed to `stdout`. Warnings and error messages are
/// printed to `stderr`.
Debug,
}
impl LogLevel {
fn as_c_int(&self) -> c_int {
match *self {
LogLevel::None => LIBUSB_LOG_LEVEL_NONE,
LogLevel::Error => LIBUSB_LOG_LEVEL_ERROR,
LogLevel::Warning => LIBUSB_LOG_LEVEL_WARNING,
LogLevel::Info => LIBUSB_LOG_LEVEL_INFO,
LogLevel::Debug => LIBUSB_LOG_LEVEL_DEBUG,
}
}
}