334 lines
11 KiB
Rust
334 lines
11 KiB
Rust
use crate::builder::Config;
|
|
use crate::driver::EndpointInfo;
|
|
use crate::types::*;
|
|
use crate::CONFIGURATION_VALUE;
|
|
|
|
/// Standard descriptor types
|
|
#[allow(missing_docs)]
|
|
pub mod descriptor_type {
|
|
pub const DEVICE: u8 = 1;
|
|
pub const CONFIGURATION: u8 = 2;
|
|
pub const STRING: u8 = 3;
|
|
pub const INTERFACE: u8 = 4;
|
|
pub const ENDPOINT: u8 = 5;
|
|
pub const IAD: u8 = 11;
|
|
pub const BOS: u8 = 15;
|
|
pub const CAPABILITY: u8 = 16;
|
|
}
|
|
|
|
/// String descriptor language IDs.
|
|
pub mod lang_id {
|
|
/// English (US)
|
|
///
|
|
/// Recommended for use as the first language ID for compatibility.
|
|
pub const ENGLISH_US: u16 = 0x0409;
|
|
}
|
|
|
|
/// Standard capability descriptor types
|
|
#[allow(missing_docs)]
|
|
pub mod capability_type {
|
|
pub const WIRELESS_USB: u8 = 1;
|
|
pub const USB_2_0_EXTENSION: u8 = 2;
|
|
pub const SS_USB_DEVICE: u8 = 3;
|
|
pub const CONTAINER_ID: u8 = 4;
|
|
pub const PLATFORM: u8 = 5;
|
|
}
|
|
|
|
/// A writer for USB descriptors.
|
|
pub(crate) struct DescriptorWriter<'a> {
|
|
pub buf: &'a mut [u8],
|
|
position: usize,
|
|
num_interfaces_mark: Option<usize>,
|
|
num_endpoints_mark: Option<usize>,
|
|
}
|
|
|
|
impl<'a> DescriptorWriter<'a> {
|
|
pub(crate) fn new(buf: &'a mut [u8]) -> Self {
|
|
DescriptorWriter {
|
|
buf,
|
|
position: 0,
|
|
num_interfaces_mark: None,
|
|
num_endpoints_mark: None,
|
|
}
|
|
}
|
|
|
|
pub fn into_buf(self) -> &'a mut [u8] {
|
|
&mut self.buf[..self.position]
|
|
}
|
|
|
|
/// Gets the current position in the buffer, i.e. the number of bytes written so far.
|
|
pub fn position(&self) -> usize {
|
|
self.position
|
|
}
|
|
|
|
/// Writes an arbitrary (usually class-specific) descriptor.
|
|
pub fn write(&mut self, descriptor_type: u8, descriptor: &[u8]) {
|
|
let length = descriptor.len();
|
|
|
|
if (self.position + 2 + length) > self.buf.len() || (length + 2) > 255 {
|
|
panic!("Descriptor buffer full");
|
|
}
|
|
|
|
self.buf[self.position] = (length + 2) as u8;
|
|
self.buf[self.position + 1] = descriptor_type;
|
|
|
|
let start = self.position + 2;
|
|
|
|
self.buf[start..start + length].copy_from_slice(descriptor);
|
|
|
|
self.position = start + length;
|
|
}
|
|
|
|
pub(crate) fn device(&mut self, config: &Config) {
|
|
self.write(
|
|
descriptor_type::DEVICE,
|
|
&[
|
|
0x10,
|
|
0x02, // bcdUSB 2.1
|
|
config.device_class, // bDeviceClass
|
|
config.device_sub_class, // bDeviceSubClass
|
|
config.device_protocol, // bDeviceProtocol
|
|
config.max_packet_size_0, // bMaxPacketSize0
|
|
config.vendor_id as u8,
|
|
(config.vendor_id >> 8) as u8, // idVendor
|
|
config.product_id as u8,
|
|
(config.product_id >> 8) as u8, // idProduct
|
|
config.device_release as u8,
|
|
(config.device_release >> 8) as u8, // bcdDevice
|
|
config.manufacturer.map_or(0, |_| 1), // iManufacturer
|
|
config.product.map_or(0, |_| 2), // iProduct
|
|
config.serial_number.map_or(0, |_| 3), // iSerialNumber
|
|
1, // bNumConfigurations
|
|
],
|
|
)
|
|
}
|
|
|
|
pub(crate) fn configuration(&mut self, config: &Config) {
|
|
self.num_interfaces_mark = Some(self.position + 4);
|
|
|
|
self.write(
|
|
descriptor_type::CONFIGURATION,
|
|
&[
|
|
0,
|
|
0, // wTotalLength
|
|
0, // bNumInterfaces
|
|
CONFIGURATION_VALUE, // bConfigurationValue
|
|
0, // iConfiguration
|
|
0x80 | if config.self_powered { 0x40 } else { 0x00 }
|
|
| if config.supports_remote_wakeup { 0x20 } else { 0x00 }, // bmAttributes
|
|
(config.max_power / 2) as u8, // bMaxPower
|
|
],
|
|
)
|
|
}
|
|
|
|
#[allow(unused)]
|
|
pub(crate) fn end_class(&mut self) {
|
|
self.num_endpoints_mark = None;
|
|
}
|
|
|
|
pub(crate) fn end_configuration(&mut self) {
|
|
let position = self.position as u16;
|
|
self.buf[2..4].copy_from_slice(&position.to_le_bytes());
|
|
}
|
|
|
|
/// Writes a interface association descriptor. Call from `UsbClass::get_configuration_descriptors`
|
|
/// before writing the USB class or function's interface descriptors if your class has more than
|
|
/// one interface and wants to play nicely with composite devices on Windows. If the USB device
|
|
/// hosting the class was not configured as composite with IADs enabled, calling this function
|
|
/// does nothing, so it is safe to call from libraries.
|
|
///
|
|
/// # Arguments
|
|
///
|
|
/// * `first_interface` - Number of the function's first interface, previously allocated with
|
|
/// [`UsbDeviceBuilder::interface`](crate::bus::UsbDeviceBuilder::interface).
|
|
/// * `interface_count` - Number of interfaces in the function.
|
|
/// * `function_class` - Class code assigned by USB.org. Use `0xff` for vendor-specific devices
|
|
/// that do not conform to any class.
|
|
/// * `function_sub_class` - Sub-class code. Depends on class.
|
|
/// * `function_protocol` - Protocol code. Depends on class and sub-class.
|
|
pub fn iad(
|
|
&mut self,
|
|
first_interface: InterfaceNumber,
|
|
interface_count: u8,
|
|
function_class: u8,
|
|
function_sub_class: u8,
|
|
function_protocol: u8,
|
|
) {
|
|
self.write(
|
|
descriptor_type::IAD,
|
|
&[
|
|
first_interface.into(), // bFirstInterface
|
|
interface_count, // bInterfaceCount
|
|
function_class,
|
|
function_sub_class,
|
|
function_protocol,
|
|
0,
|
|
],
|
|
);
|
|
}
|
|
|
|
/// Writes a interface descriptor with a specific alternate setting and
|
|
/// interface string identifier.
|
|
///
|
|
/// # Arguments
|
|
///
|
|
/// * `number` - Interface number previously allocated with
|
|
/// [`UsbDeviceBuilder::interface`](crate::bus::UsbDeviceBuilder::interface).
|
|
/// * `alternate_setting` - Number of the alternate setting
|
|
/// * `interface_class` - Class code assigned by USB.org. Use `0xff` for vendor-specific devices
|
|
/// that do not conform to any class.
|
|
/// * `interface_sub_class` - Sub-class code. Depends on class.
|
|
/// * `interface_protocol` - Protocol code. Depends on class and sub-class.
|
|
/// * `interface_string` - Index of string descriptor describing this interface
|
|
|
|
pub fn interface_alt(
|
|
&mut self,
|
|
number: InterfaceNumber,
|
|
alternate_setting: u8,
|
|
interface_class: u8,
|
|
interface_sub_class: u8,
|
|
interface_protocol: u8,
|
|
interface_string: Option<StringIndex>,
|
|
) {
|
|
if alternate_setting == 0 {
|
|
match self.num_interfaces_mark {
|
|
Some(mark) => self.buf[mark] += 1,
|
|
None => {
|
|
panic!("you can only call `interface/interface_alt` after `configuration`.")
|
|
}
|
|
};
|
|
}
|
|
|
|
let str_index = interface_string.map_or(0, Into::into);
|
|
|
|
self.num_endpoints_mark = Some(self.position + 4);
|
|
|
|
self.write(
|
|
descriptor_type::INTERFACE,
|
|
&[
|
|
number.into(), // bInterfaceNumber
|
|
alternate_setting, // bAlternateSetting
|
|
0, // bNumEndpoints
|
|
interface_class, // bInterfaceClass
|
|
interface_sub_class, // bInterfaceSubClass
|
|
interface_protocol, // bInterfaceProtocol
|
|
str_index, // iInterface
|
|
],
|
|
);
|
|
}
|
|
|
|
/// Writes an endpoint descriptor.
|
|
///
|
|
/// # Arguments
|
|
///
|
|
/// * `endpoint` - Endpoint previously allocated with
|
|
/// [`UsbDeviceBuilder`](crate::bus::UsbDeviceBuilder).
|
|
pub fn endpoint(&mut self, endpoint: &EndpointInfo) {
|
|
match self.num_endpoints_mark {
|
|
Some(mark) => self.buf[mark] += 1,
|
|
None => panic!("you can only call `endpoint` after `interface/interface_alt`."),
|
|
};
|
|
|
|
self.write(
|
|
descriptor_type::ENDPOINT,
|
|
&[
|
|
endpoint.addr.into(), // bEndpointAddress
|
|
endpoint.ep_type as u8, // bmAttributes
|
|
endpoint.max_packet_size as u8,
|
|
(endpoint.max_packet_size >> 8) as u8, // wMaxPacketSize
|
|
endpoint.interval, // bInterval
|
|
],
|
|
);
|
|
}
|
|
|
|
/// Writes a string descriptor.
|
|
#[allow(unused)]
|
|
pub(crate) fn string(&mut self, string: &str) {
|
|
let mut pos = self.position;
|
|
|
|
if pos + 2 > self.buf.len() {
|
|
panic!("Descriptor buffer full");
|
|
}
|
|
|
|
self.buf[pos] = 0; // length placeholder
|
|
self.buf[pos + 1] = descriptor_type::STRING;
|
|
|
|
pos += 2;
|
|
|
|
for c in string.encode_utf16() {
|
|
if pos >= self.buf.len() {
|
|
panic!("Descriptor buffer full");
|
|
}
|
|
|
|
self.buf[pos..pos + 2].copy_from_slice(&c.to_le_bytes());
|
|
pos += 2;
|
|
}
|
|
|
|
self.buf[self.position] = (pos - self.position) as u8;
|
|
|
|
self.position = pos;
|
|
}
|
|
}
|
|
|
|
/// A writer for Binary Object Store descriptor.
|
|
pub struct BosWriter<'a> {
|
|
pub(crate) writer: DescriptorWriter<'a>,
|
|
num_caps_mark: Option<usize>,
|
|
}
|
|
|
|
impl<'a> BosWriter<'a> {
|
|
pub(crate) fn new(writer: DescriptorWriter<'a>) -> Self {
|
|
Self {
|
|
writer: writer,
|
|
num_caps_mark: None,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn bos(&mut self) {
|
|
self.num_caps_mark = Some(self.writer.position + 4);
|
|
self.writer.write(
|
|
descriptor_type::BOS,
|
|
&[
|
|
0x00, 0x00, // wTotalLength
|
|
0x00, // bNumDeviceCaps
|
|
],
|
|
);
|
|
|
|
self.capability(capability_type::USB_2_0_EXTENSION, &[0; 4]);
|
|
}
|
|
|
|
/// Writes capability descriptor to a BOS
|
|
///
|
|
/// # Arguments
|
|
///
|
|
/// * `capability_type` - Type of a capability
|
|
/// * `data` - Binary data of the descriptor
|
|
pub fn capability(&mut self, capability_type: u8, data: &[u8]) {
|
|
match self.num_caps_mark {
|
|
Some(mark) => self.writer.buf[mark] += 1,
|
|
None => panic!("called `capability` not between `bos` and `end_bos`."),
|
|
}
|
|
|
|
let mut start = self.writer.position;
|
|
let blen = data.len();
|
|
|
|
if (start + blen + 3) > self.writer.buf.len() || (blen + 3) > 255 {
|
|
panic!("Descriptor buffer full");
|
|
}
|
|
|
|
self.writer.buf[start] = (blen + 3) as u8;
|
|
self.writer.buf[start + 1] = descriptor_type::CAPABILITY;
|
|
self.writer.buf[start + 2] = capability_type;
|
|
|
|
start += 3;
|
|
self.writer.buf[start..start + blen].copy_from_slice(data);
|
|
self.writer.position = start + blen;
|
|
}
|
|
|
|
pub(crate) fn end_bos(&mut self) {
|
|
self.num_caps_mark = None;
|
|
let position = self.writer.position as u16;
|
|
self.writer.buf[2..4].copy_from_slice(&position.to_le_bytes());
|
|
}
|
|
}
|