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# SPDX-FileCopyrightText: © 2020 The freestyle-hid Authors
# SPDX-License-Identifier: Apache-2.0
"""HID wrappers to access files with either hidraw or cython-hidapi."""
import abc
import pathlib
from typing import BinaryIO, Optional, Union
try:
import hid
except ImportError:
hid = None
from ._exceptions import HIDError
class HidWrapper(abc.ABC):
_handle: Union[BinaryIO, "hid.device"]
def write(self, report: bytes) -> None:
if len(report) > 65:
raise HIDError(f"Invalid report length {len(report)}.")
written = self._handle.write(report)
if written < 0:
raise HIDError(f"Invalid write ({written}).")
@abc.abstractmethod
def read(self, size: int = 64) -> bytes:
pass
@staticmethod
def open(
device_path: Optional[pathlib.Path], vendor_id: int, product_id: Optional[int]
) -> "HidWrapper":
if device_path:
return HidRaw(device_path)
else:
assert product_id is not None
return HidApi(vendor_id, product_id)
class HidRaw(HidWrapper):
def __init__(self, device_path: pathlib.Path) -> None:
if not device_path.exists():
raise ValueError(f"Path {device_path} does not exists.")
self._handle = device_path.open("w+b")
def read(self, size: int = 64) -> bytes:
return self._handle.read(size)
class HidApi(HidWrapper):
_handle: "hid.device"
def __init__(self, vendor_id: int, product_id: int) -> None:
if hid is None:
raise ValueError("cython-hidapi not found.")
self._handle = hid.device()
self._handle.open(vendor_id, product_id)
def read(self, size: int = 64) -> bytes:
return bytes(self._handle.read(size, timeout_ms=0))
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