wasefire 0.8.1

High-level Wasefire applet API
Documentation 
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Provides API for USB serial.

use sealed::sealed;
use wasefire_applet_api::usb::serial as api;

use crate::serial::Event;
use crate::{Error, convert, convert_unit};

/// Implements the [`Serial`](crate::serial::Serial) interface for the USB serial.
pub struct UsbSerial;

#[sealed]
impl crate::serial::Serial for UsbSerial {
    fn read(&self, buffer: &mut [u8]) -> Result<usize, Error> {
        let params = api::read::Params { ptr: buffer.as_mut_ptr(), len: buffer.len() };
        convert(unsafe { api::read(params) })
    }

    fn write(&self, buffer: &[u8]) -> Result<usize, Error> {
        let params = api::write::Params { ptr: buffer.as_ptr(), len: buffer.len() };
        convert(unsafe { api::write(params) })
    }

    fn flush(&self) -> Result<(), Error> {
        convert_unit(unsafe { api::flush() })
    }

    unsafe fn register(
        &self, event: Event, func: extern "C" fn(*const u8), data: *const u8,
    ) -> Result<(), Error> {
        let params = api::register::Params {
            event: convert_event(event) as usize,
            handler_func: func,
            handler_data: data,
        };
        convert_unit(unsafe { api::register(params) })
    }

    fn unregister(&self, event: Event) -> Result<(), Error> {
        let params = api::unregister::Params { event: convert_event(event) as usize };
        convert_unit(unsafe { api::unregister(params) })
    }
}

fn convert_event(event: Event) -> api::Event {
    match event {
        Event::Read => api::Event::Read,
        Event::Write => api::Event::Write,
    }
}