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#pragma once
#include "rawaccel-io-def.h"
#include "rawaccel-version.h"
#include "rawaccel-error.hpp"
#include "rawaccel.hpp"
#pragma warning(push)
#pragma warning(disable:4245) // int -> DWORD conversion while passing CTL_CODE
namespace rawaccel {
inline void io_control(DWORD code, void* in, DWORD in_size, void* out, DWORD out_size)
{
HANDLE ra_handle = INVALID_HANDLE_VALUE;
ra_handle = CreateFileW(L"\\\\.\\rawaccel", 0, 0, 0, OPEN_EXISTING, 0, 0);
if (ra_handle == INVALID_HANDLE_VALUE) {
throw install_error();
}
DWORD dummy;
BOOL success = DeviceIoControl(
ra_handle,
code,
in,
in_size,
out,
out_size,
&dummy, // bytes returned
NULL // overlapped structure
);
CloseHandle(ra_handle);
if (!success) {
throw sys_error("DeviceIoControl failed");
}
}
inline void read(io_t& args)
{
io_control(RA_READ, NULL, 0, &args, sizeof(io_t));
}
inline void write(const io_t& args)
{
io_control(RA_WRITE, const_cast<io_t*>(&args), sizeof(io_t), NULL, 0);
}
inline version_t get_version()
{
version_t v;
try {
io_control(RA_GET_VERSION, NULL, 0, &v, sizeof(version_t));
}
catch (const sys_error&) {
// assume request is not implemented (< 1.3)
v = { 0 };
}
return v;
}
inline version_t valid_version_or_throw()
{
auto v = get_version();
if (v < min_driver_version) {
throw error("reinstallation required");
}
if (version < v) {
throw error("newer driver is installed");
}
return v;
}
}
#pragma warning(pop)
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