lxdrgen-cpp: add a Qt backend

Motivation: some Android NDKs do not have iconv.

CMakeLists.txt

@@ -2,6 +2,7 @@ cmake_minimum_required (VERSION 3.0...3.27)
 project (liberty C CXX)
 
 # Moar warnings
+set (CMAKE_CXX_STANDARD 11)
 if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUCC)
 	# -Wunused-function is pretty annoying here, as everything is static
 	set (wdisabled "-Wno-unused-function")
@@ -104,6 +105,7 @@ else ()
 	add_executable (test-lxdrgen-cpp tests/lxdrgen.cpp
 		${lxdrgen_base}.cpp tools/lxdrgen-cpp-posix.cpp)
 endif ()
+target_link_libraries (test-lxdrgen-cpp ${common_libraries})
 target_include_directories (test-lxdrgen-cpp PUBLIC ${PROJECT_BINARY_DIR})
 add_test (NAME test-lxdrgen-cpp COMMAND test-lxdrgen-cpp)
 

README.adoc

@@ -45,8 +45,9 @@ lxdrgen-c.awk::
 	LibertyXDR backend that builds on top of the C pseudolibrary.
 
 lxdrgen-cpp.awk::
-lxdrgen-cpp-win32.cpp::
 lxdrgen-cpp-posix.cpp::
+lxdrgen-cpp-qt.cpp::
+lxdrgen-cpp-win32.cpp::
 	LibertyXDR backend for C++, primarily targeting Win32 and its wide strings.
 	Link the result together with one of the accompanied source files.
 

tools/lxdrgen-cpp-qt.cpp

@@ -0,0 +1,23 @@
+// lxdrgen-cpp-qt.cpp: Qt support code for lxdrgen-cpp.awk.
+//
+// Copyright (c) 2024, Přemysl Eric Janouch <p@janouch.name>
+// SPDX-License-Identifier: 0BSD
+#include <QString>
+#include <string>
+
+namespace LibertyXDR {
+
+bool utf8_to_wstring(const uint8_t *utf8, size_t length, std::wstring &wide) {
+	QByteArrayView view(reinterpret_cast<const char *>(utf8), length);
+	if (!view.isValidUtf8())
+		return false;
+	wide = QString::fromUtf8(view).toStdWString();
+	return true;
+}
+
+bool wstring_to_utf8(const std::wstring &wide, std::string &utf8) {
+	utf8 = QString::fromStdWString(wide).toUtf8().toStdString();
+	return true;
+}
+
+} // namespace LibertyXDR