7 files changed, 162 insertions, 0 deletions
diff --git a/um/libsimple/CMakeLists.txt b/um/libsimple/CMakeLists.txt
new file mode 100644
index 0000000..ff61bd7
--- /dev/null
+++ b/um/libsimple/CMakeLists.txt
@@ -0,0 +1,9 @@
+file(GLOB_RECURSE libsimple_headers "include/*.hpp")
+file(GLOB libsimple_sources "src/*.cpp")
+add_library(libsimple
+    ${libsimple_sources}
+    ${libsimple_headers})
+target_link_libraries(libsimple libservice)
+target_include_directories(libsimple PUBLIC include/)
+
+add_subdirectory(utils)
diff --git a/um/libsimple/README.md b/um/libsimple/README.md
new file mode 100644
index 0000000..ac00d63
--- /dev/null
+++ b/um/libsimple/README.md
@@ -0,0 +1,43 @@
+simple driver utilities
+=======================
+
+[simple] driver usage examples.
+
+[simple]: ../../km/src/simple
+
+Usage
+-----
+
+### exchange_ints.exe
+
+```
+Usage: exchange_ints.exe N
+```
+
+Parses its argument as an `unsigned int` and exchanges it with the one stored
+in [simple] driver's memory.
+For example:
+
+```
+> exchange_ints.exe 1
+42
+```
+
+```
+> exchange_ints.exe 32
+1
+```
+
+```
+> exchange_ints.exe 100500
+32
+```
+
+See also
+--------
+
+* [Building the utilities]
+* [License]
+
+[Building the utilities]: ../README.md#building-the-utilities
+[License]: ../../README.md#license
diff --git a/um/libsimple/include/libsimple/all.hpp b/um/libsimple/include/libsimple/all.hpp
new file mode 100644
index 0000000..474b802
--- /dev/null
+++ b/um/libsimple/include/libsimple/all.hpp
@@ -0,0 +1,8 @@
+// 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.
+
+#pragma once
+
+#include "device.hpp"
diff --git a/um/libsimple/include/libsimple/device.hpp b/um/libsimple/include/libsimple/device.hpp
new file mode 100644
index 0000000..3318818
--- /dev/null
+++ b/um/libsimple/include/libsimple/device.hpp
@@ -0,0 +1,19 @@
+// 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.
+
+#pragma once
+
+#include "libservice/all.hpp"
+
+namespace libsimple
+{
+    class Device : libservice::Device
+    {
+    public:
+        Device();
+
+        unsigned int exchange_ints(unsigned int) const;
+    };
+}
diff --git a/um/libsimple/src/device.cpp b/um/libsimple/src/device.cpp
new file mode 100644
index 0000000..57e6963
--- /dev/null
+++ b/um/libsimple/src/device.cpp
@@ -0,0 +1,37 @@
+// 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 "libsimple/all.hpp"
+
+#include "libservice/all.hpp"
+
+#include <Windows.h>
+
+namespace libsimple
+{
+    namespace
+    {
+        const char* const device_path = "\\\\.\\simple_device1";
+        const auto exchange_ints_ctl_code = CTL_CODE(0x8001, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS);
+    }
+
+    Device::Device()
+        : libservice::Device(libservice::Device::open(device_path))
+    { }
+
+    unsigned int Device::exchange_ints(unsigned int src) const
+    {
+        unsigned int dest;
+
+        send_control_code(
+            exchange_ints_ctl_code,
+            &src,
+            sizeof(src),
+            &dest,
+            sizeof(dest));
+
+        return dest;
+    }
+}
diff --git a/um/libsimple/utils/CMakeLists.txt b/um/libsimple/utils/CMakeLists.txt
new file mode 100644
index 0000000..8824e3e
--- /dev/null
+++ b/um/libsimple/utils/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_executable(exchange_ints exchange_ints.cpp)
+target_link_libraries(exchange_ints libsimple)
diff --git a/um/libsimple/utils/exchange_ints.cpp b/um/libsimple/utils/exchange_ints.cpp
new file mode 100644
index 0000000..2935b2f
--- /dev/null
+++ b/um/libsimple/utils/exchange_ints.cpp
@@ -0,0 +1,44 @@
+// 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 "libsimple/all.hpp"
+
+#include <exception>
+#include <iostream>
+#include <sstream>
+#include <string>
+
+namespace
+{
+    bool parse_int(unsigned int& dest, const std::string& src)
+    {
+        std::istringstream iss(src);
+        char c;
+        return iss >> dest && !iss.get(c);
+    }
+}
+
+int main(int argc, char* argv[])
+{
+    try
+    {
+        unsigned int src;
+
+        if (argc != 2 || !parse_int(src, argv[1]))
+        {
+            std::cout << "Usage: " << argv[0] << " N\n";
+            return 1;
+        }
+
+        std::cout << libsimple::Device().exchange_ints(src) << "\n";
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+
+    return 0;
+}