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use std::{fmt, slice};
use libusb1_sys::*;
use crate::interface_descriptor::{self, Interface};
pub struct ConfigDescriptor {
descriptor: *const libusb_config_descriptor,
}
impl Drop for ConfigDescriptor {
fn drop(&mut self) {
unsafe {
libusb_free_config_descriptor(self.descriptor);
}
}
}
unsafe impl Sync for ConfigDescriptor {}
unsafe impl Send for ConfigDescriptor {}
impl ConfigDescriptor {
pub fn number(&self) -> u8 {
unsafe { (*self.descriptor).bConfigurationValue }
}
pub fn max_power(&self) -> u16 {
unsafe { u16::from((*self.descriptor).bMaxPower) * 2 }
}
pub fn self_powered(&self) -> bool {
unsafe { (*self.descriptor).bmAttributes & 0x40 != 0 }
}
pub fn remote_wakeup(&self) -> bool {
unsafe { (*self.descriptor).bmAttributes & 0x20 != 0 }
}
pub fn description_string_index(&self) -> Option<u8> {
unsafe {
match (*self.descriptor).iConfiguration {
0 => None,
n => Some(n),
}
}
}
pub fn num_interfaces(&self) -> u8 {
unsafe { (*self.descriptor).bNumInterfaces }
}
pub fn interfaces(&self) -> Interfaces {
let interfaces = unsafe {
slice::from_raw_parts(
(*self.descriptor).interface,
(*self.descriptor).bNumInterfaces as usize,
)
};
Interfaces {
iter: interfaces.iter(),
}
}
pub fn extra(&self) -> Option<&[u8]> {
unsafe {
match (*self.descriptor).extra_length {
len if len > 0 => Some(slice::from_raw_parts(
(*self.descriptor).extra,
len as usize,
)),
_ => None,
}
}
}
}
impl fmt::Debug for ConfigDescriptor {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
let mut debug = fmt.debug_struct("ConfigDescriptor");
let descriptor: &libusb_config_descriptor = unsafe { &*self.descriptor };
debug.field("bLength", &descriptor.bLength);
debug.field("bDescriptorType", &descriptor.bDescriptorType);
debug.field("wTotalLength", &descriptor.wTotalLength);
debug.field("bNumInterfaces", &descriptor.bNumInterfaces);
debug.field("bConfigurationValue", &descriptor.bConfigurationValue);
debug.field("iConfiguration", &descriptor.iConfiguration);
debug.field("bmAttributes", &descriptor.bmAttributes);
debug.field("bMaxPower", &descriptor.bMaxPower);
debug.field("extra", &self.extra());
debug.finish()
}
}
pub struct Interfaces<'a> {
iter: slice::Iter<'a, libusb_interface>,
}
impl<'a> Iterator for Interfaces<'a> {
type Item = Interface<'a>;
fn next(&mut self) -> Option<Interface<'a>> {
self.iter
.next()
.map(|interface| unsafe { interface_descriptor::from_libusb(interface) })
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}
#[doc(hidden)]
pub(crate) unsafe fn from_libusb(config: *const libusb_config_descriptor) -> ConfigDescriptor {
ConfigDescriptor { descriptor: config }
}
#[cfg(test)]
mod test {
use std::mem;
macro_rules! with_config {
($name:ident : $config:expr => $body:block) => {{
let $name = unsafe { super::from_libusb(&$config) };
$body;
mem::forget($name);
}};
}
#[test]
fn it_has_number() {
with_config!(config: config_descriptor!(bConfigurationValue: 42) => {
assert_eq!(42, config.number());
});
}
#[test]
fn it_has_max_power() {
with_config!(config: config_descriptor!(bMaxPower: 21) => {
assert_eq!(42, config.max_power());
});
}
#[test]
fn it_interprets_self_powered_bit_in_attributes() {
with_config!(config: config_descriptor!(bmAttributes: 0b0000_0000) => {
assert_eq!(false, config.self_powered());
});
with_config!(config: config_descriptor!(bmAttributes: 0b0100_0000) => {
assert_eq!(true, config.self_powered());
});
}
#[test]
fn it_interprets_remote_wakeup_bit_in_attributes() {
with_config!(config: config_descriptor!(bmAttributes: 0b0000_0000) => {
assert_eq!(false, config.remote_wakeup());
});
with_config!(config: config_descriptor!(bmAttributes: 0b0010_0000) => {
assert_eq!(true, config.remote_wakeup());
});
}
#[test]
fn it_has_description_string_index() {
with_config!(config: config_descriptor!(iConfiguration: 42) => {
assert_eq!(Some(42), config.description_string_index());
});
}
#[test]
fn it_handles_missing_description_string_index() {
with_config!(config: config_descriptor!(iConfiguration: 0) => {
assert_eq!(None, config.description_string_index());
});
}
#[test]
fn it_has_num_interfaces() {
let interface1 = interface!(interface_descriptor!(bInterfaceNumber: 1));
let interface2 = interface!(interface_descriptor!(bInterfaceNumber: 2));
with_config!(config: config_descriptor!(interface1, interface2) => {
assert_eq!(2, config.num_interfaces());
});
}
#[test]
fn it_has_interfaces() {
let interface = interface!(interface_descriptor!(bInterfaceNumber: 1));
with_config!(config: config_descriptor!(interface) => {
let interface_numbers = config.interfaces().map(|interface| {
interface.number()
}).collect::<Vec<_>>();
assert_eq!(vec![1], interface_numbers);
});
}
}