static bool TryParseReportDescriptor(IntPtr device, out ReportDescriptors.Parser.ReportDescriptorParser parser, out byte[] reportDescriptor)
{
parser = null;
reportDescriptor = null;
string devnode = NativeMethods.udev_device_get_devnode(device);
if (null == devnode)
{
return(false);
}
int handle = NativeMethods.retry(() => NativeMethods.open
(devnode, NativeMethods.oflag.NONBLOCK));
if (handle < 0)
{
return(false);
}
try {
uint descsize;
if (NativeMethods.ioctl(handle, NativeMethods.HIDIOCGRDESCSIZE, out descsize) < 0)
{
return(false);
}
if (descsize > NativeMethods.HID_MAX_DESCRIPTOR_SIZE)
{
return(false);
}
var desc = new NativeMethods.hidraw_report_descriptor()
{
size = descsize
};
if (NativeMethods.ioctl(handle, NativeMethods.HIDIOCGRDESC, ref desc) < 0)
{
return(false);
}
Array.Resize(ref desc.value, (int)descsize);
parser = new ReportDescriptors.Parser.ReportDescriptorParser();
parser.Parse(desc.value);
reportDescriptor = desc.value;
return(true);
} catch (Exception e) {
Debug.Print("{0}", e);
throw;
} finally {
NativeMethods.retry(() => NativeMethods.close(handle));
}
}
bool TryParseReportDescriptor(out Reports.ReportDescriptor parser, out byte[] reportDescriptor)
{
parser = null; reportDescriptor = null;
int handle;
try { handle = LinuxHidStream.DeviceHandleFromPath(_path, this, NativeMethods.oflag.NONBLOCK); }
catch (FileNotFoundException) { throw DeviceException.CreateIOException(this, "Failed to read report descriptor."); }
try
{
uint descsize;
if (NativeMethods.ioctl(handle, NativeMethods.HIDIOCGRDESCSIZE, out descsize) < 0)
{
return(false);
}
if (descsize > NativeMethods.HID_MAX_DESCRIPTOR_SIZE)
{
return(false);
}
var desc = new NativeMethods.hidraw_report_descriptor()
{
size = descsize
};
if (NativeMethods.ioctl(handle, NativeMethods.HIDIOCGRDESC, ref desc) < 0)
{
return(false);
}
Array.Resize(ref desc.value, (int)descsize);
parser = new Reports.ReportDescriptor(desc.value);
reportDescriptor = desc.value; return(true);
}
finally
{
NativeMethods.retry(() => NativeMethods.close(handle));
}
}
