From 9bf7f2bfeb3057ad8b49fc0361fee5036639dfe1 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Mon, 11 May 2015 13:32:30 +0300
Subject: libservice: add virtual device wrappers

---
 utils/libservice/src/device.cpp | 126 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 utils/libservice/src/device.cpp

(limited to 'utils/libservice/src/device.cpp')

diff --git a/utils/libservice/src/device.cpp b/utils/libservice/src/device.cpp
new file mode 100644
index 0000000..3cfb760
--- /dev/null
+++ b/utils/libservice/src/device.cpp
@@ -0,0 +1,126 @@
+/**
+ * \file
+ * \author Egor Tensin <Egor.Tensin@gmail.com>
+ * \date 2015
+ * \copyright This file is licensed under the terms of the MIT License.
+ *            See LICENSE.txt for details.
+ */
+
+#include "libservice/common.hpp"
+#include "libservice/device.hpp"
+#include "libservice/handle.hpp"
+#include "libservice/windows_error.hpp"
+
+#include <Windows.h>
+
+#include <string>
+#include <system_error>
+#include <utility>
+
+namespace libservice
+{
+    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 std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+
+            return Handle(raw);
+        }
+    }
+
+    Device Device::open(const std::string& path)
+    {
+        return Device(open_device(path));
+    }
+
+    DWORD Device::get_required_output_size(
+        DWORD code,
+        const void* in_buf,
+        DWORD in_buf_size) const
+    {
+        DWORD nbreq;
+
+        DWORD ret = DeviceIoControl(
+            static_cast<HANDLE>(m_handle),
+            code,
+            const_cast<void*>(in_buf),
+            in_buf_size,
+            NULL,
+            0,
+            &nbreq,
+            NULL);
+
+        if (0 == ret)
+        {
+            const auto ec = GetLastError();
+
+            switch (ec)
+            {
+                case ERROR_MORE_DATA:
+                    return nbreq;
+
+                default:
+                    throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+            }
+        }
+
+        return ret;
+    }
+
+    DWORD Device::send_control_code(
+        DWORD code,
+        const void* in_buf,
+        DWORD in_buf_size,
+        void* out_buf,
+        DWORD out_buf_size) const
+    {
+        DWORD nbreq;
+
+        DWORD ret = DeviceIoControl(
+            static_cast<HANDLE>(m_handle),
+            code,
+            const_cast<void*>(in_buf),
+            in_buf_size,
+            out_buf,
+            out_buf_size,
+            &nbreq,
+            NULL);
+
+        if (0 == ret)
+        {
+            const auto ec = GetLastError();
+            throw std::system_error(ec, WinErrorCategory::get(), LIBSERVICE_ERROR_PREFIX);
+        }
+
+        return ret;
+    }
+
+    void swap(Device& a, Device& b) LIBSERVICE_NOEXCEPT
+    {
+        a.swap(b);
+    }
+}
+
+namespace std
+{
+    template <>
+    void swap<libservice::Device>(
+        libservice::Device& a,
+        libservice::Device& b)
+    {
+        a.swap(b);
+    }
+}
-- 
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