eusb 0.4.2

Rust library for accessing USB devices.
Documentation 
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use libusb_src::*;
use std::{result};
use std::ffi::c_int;

pub type Result<T> = result::Result<T, Error>;

#[derive(thiserror::Error, Debug)]
pub enum Error {
    #[error("Input/output error: {0}")]
    Io(String),

    #[error("Invalid parameter")]
    InvalidParam,

    #[error("Access denied (insufficient permissions)")]
    Access,

    #[error("No such device (it may have been disconnected)")]
    NoDevice,

    #[error("Entity not found")]
    NotFound,

    #[error("Resource busy ")]
    Busy,

    #[error("Operation timed out")]
    Timeout,

    #[error("Overflow")]
    Overflow,

    #[error("Pipe error")]
    Pipe,

    #[error("System call interrupted (perhaps due to signal)")]
    Interrupted,

    #[error("Insufficient memory")]
    NoMem,

    #[error("Operation not supported or unimplemented on this platform")]
    NotSupported,

    #[error("Cancelled")]
    Cancelled,

    #[error("[USB] Something wrong: {0}")]
    Other(String),
}

pub(crate) fn check_err(r: c_int) -> Result<i32> {
    if r >= 0 { Ok(r as _) } else {
        let e = match r {
            LIBUSB_ERROR_IO            =>Error::Io("Usb".to_string()),
            LIBUSB_ERROR_INVALID_PARAM =>Error::InvalidParam,
            LIBUSB_ERROR_ACCESS        =>Error::Access,
            LIBUSB_ERROR_NO_DEVICE     =>Error::NoDevice,
            LIBUSB_ERROR_NOT_FOUND     =>Error::NotFound,
            LIBUSB_ERROR_BUSY          =>Error::Busy,
            LIBUSB_ERROR_TIMEOUT       =>Error::Timeout,
            LIBUSB_ERROR_OVERFLOW      =>Error::Overflow,
            LIBUSB_ERROR_PIPE          =>Error::Pipe,
            LIBUSB_ERROR_INTERRUPTED   =>Error::Interrupted,
            LIBUSB_ERROR_NO_MEM        =>Error::NoMem,
            LIBUSB_ERROR_NOT_SUPPORTED =>Error::NotSupported,
            _ => Error::Other("Libusb Unknown".to_string())
        };

        Err(e)
    }
}