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// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "Windows 7 drivers" project.
// For details, see https://github.com/egor-tensin/windows7-drivers.
// Distributed under the MIT License.
#include "service/all.hpp"
#include <Windows.h>
#include <cstddef>
#include <limits>
#include <stdexcept>
#include <string>
namespace service {
namespace {
Handle open_device(const std::string& path) {
const auto raw = CreateFileA(
path.c_str(),
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (INVALID_HANDLE_VALUE == raw) {
const auto ec = GetLastError();
throw windows_error::make(ec, __FILE__, __LINE__, __FUNCTION__);
}
return Handle(raw);
}
} // namespace
Device Device::open(const std::string& path) {
return Device(open_device(path));
}
std::size_t Device::get_required_output_size(
Code code,
const void* in_buf,
std::size_t in_buf_size
) const {
DWORD nbreq;
if (in_buf_size > std::numeric_limits<DWORD>::max())
throw std::range_error("input buffer size is too large");
std::size_t nbwritten = DeviceIoControl(
handle,
code,
const_cast<void*>(in_buf),
static_cast<DWORD>(in_buf_size),
NULL,
0,
&nbreq,
NULL
);
if (0 == nbwritten) {
const auto ec = GetLastError();
switch (ec) {
case ERROR_MORE_DATA:
return nbreq;
default:
throw windows_error::make(ec, __FILE__, __LINE__, __FUNCTION__);
}
}
return nbwritten;
}
std::size_t Device::send_control_code(
Code code,
const void* in_buf,
std::size_t in_buf_size,
void* out_buf,
std::size_t out_buf_size
) const {
DWORD nbreq;
if (in_buf_size > std::numeric_limits<DWORD>::max())
throw std::range_error("input buffer size is too large");
if (out_buf_size > std::numeric_limits<DWORD>::max())
throw std::range_error("output buffer size is too large");
std::size_t nbwritten = DeviceIoControl(
handle,
code,
const_cast<void*>(in_buf),
static_cast<DWORD>(in_buf_size),
out_buf,
static_cast<DWORD>(out_buf_size),
&nbreq,
NULL
);
if (0 == nbwritten) {
const auto ec = GetLastError();
throw windows_error::make(ec, __FILE__, __LINE__, __FUNCTION__);
}
return nbwritten;
}
} // namespace service
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