1 files changed, 75 insertions, 0 deletions
diff --git a/src/file.cpp b/src/file.cpp
new file mode 100644
index 0000000..cb9be81
--- /dev/null
+++ b/src/file.cpp
@@ -0,0 +1,75 @@
+// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "winapi-common" project.
+// For details, see https://github.com/egor-tensin/winapi-common.
+// Distributed under the MIT License.
+
+#include <winapi/error.hpp>
+#include <winapi/file.hpp>
+#include <winapi/handle.hpp>
+#include <winapi/utf8.hpp>
+
+#include <cstring>
+#include <string>
+
+namespace winapi {
+namespace {
+
+struct CreateFileParams {
+    static CreateFileParams read() {
+        CreateFileParams params;
+        params.dwDesiredAccess = GENERIC_READ;
+        params.dwShareMode = FILE_SHARE_READ;
+        params.dwCreationDisposition = OPEN_EXISTING;
+        return params;
+    }
+
+    static CreateFileParams write() {
+        CreateFileParams params;
+        params.dwDesiredAccess = GENERIC_WRITE;
+        params.dwShareMode = FILE_SHARE_READ;
+        params.dwCreationDisposition = OPEN_ALWAYS;
+        return params;
+    }
+
+    DWORD dwDesiredAccess = 0;
+    DWORD dwShareMode = 0;
+    DWORD dwCreationDisposition = 0;
+
+private:
+    CreateFileParams() = default;
+};
+
+Handle open_file(const std::string& path, const CreateFileParams& params) {
+    const auto unicode_path = LR"(\\?\)" + widen(path);
+
+    SECURITY_ATTRIBUTES attributes;
+    std::memset(&attributes, 0, sizeof(attributes));
+    attributes.nLength = sizeof(attributes);
+    attributes.bInheritHandle = TRUE;
+
+    const auto handle = ::CreateFileW(unicode_path.c_str(),
+                                      params.dwDesiredAccess,
+                                      params.dwShareMode,
+                                      &attributes,
+                                      params.dwCreationDisposition,
+                                      FILE_ATTRIBUTE_NORMAL,
+                                      NULL);
+
+    if (handle == INVALID_HANDLE_VALUE) {
+        throw error::windows(GetLastError(), "CreateFileW");
+    }
+
+    return Handle{handle};
+}
+
+} // namespace
+
+Handle File::open_for_reading(const std::string& path) {
+    return open_file(path, CreateFileParams::read());
+}
+
+Handle File::open_for_writing(const std::string& path) {
+    return open_file(path, CreateFileParams::write());
+}
+
+} // namespace winapi