win: Make reading NT_IMAGE_HEADERS work cross-bitness

test/win/child_launcher.h

+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_TEST_WIN_CHILD_LAUNCHER_H_
+#define CRASHPAD_TEST_WIN_CHILD_LAUNCHER_H_
+
+#include <windows.h>
+
+#include <string>
+
+#include "util/win/scoped_handle.h"
+
+namespace crashpad {
+namespace test {
+
+//! \brief Creates a child process for testing. Uses gtest `ASSERT_*` to
+//!     indicate failure. The child's output is passed through a pipe and is
+//!     available via stdout_read_handle().
+class ChildLauncher {
+ public:
+  //! \brief Creates the object. \a executable will be escaped and prepended to
+  //!     \a command_line to build the command line of the child.
+  ChildLauncher(const std::wstring& executable,
+                const std::wstring& command_line);
+
+  ~ChildLauncher();
+
+  //! \brief Starts the child process, after which the handle functions below
+  //!     will be valid.
+  void Start();
+
+  //! \brief The child process's `HANDLE`.
+  HANDLE process_handle() const { return process_handle_.get(); }
+
+  //! \brief The child process's main thread's `HANDLE`.
+  HANDLE main_thread_handle() const { return main_thread_handle_.get(); }
+
+  //! \brief The read end of a pipe attached to the child's stdout.
+  HANDLE stdout_read_handle() const { return stdout_read_handle_.get(); }
+
+ private:
+  std::wstring executable_;
+  std::wstring command_line_;
+  ScopedKernelHANDLE process_handle_;
+  ScopedKernelHANDLE main_thread_handle_;
+  ScopedFileHANDLE stdout_read_handle_;
+};
+
+//! \brief Utility function for building escaped command lines.
+//!
+//! \param[in] argument Appended to \a command_line surrounded by properly
+//!     escaped quotation marks, if necessary.
+//! \param[inout] command_line The command line being constructed.
+void AppendCommandLineArgument(const std::wstring& argument,
+                               std::wstring* command_line);
+
+}  // namespace test
+}  // namespace crashpad
+
+#endif  // CRASHPAD_TEST_WIN_CHILD_LAUNCHER_H_