From 53d70feedcfa3222340467d259dade9fca238cc0 Mon Sep 17 00:00:00 2001
From: Julles <Julles@qq.com>
Date: Thu, 18 Apr 2024 15:48:44 +0800
Subject: [PATCH] fix #79:include <experimental/filesystem> for old compilers

---
 CMakeLists.txt                    |  2 +-
 mdflib/src/at4block.cpp           | 23 +++++++++++++++--------
 mdflib/src/cryptoutil.cpp         | 16 ++++++++++++----
 mdflib/src/expatxml.cpp           |  9 ++++++++-
 mdflib/src/ichannelconversion.cpp |  2 +-
 mdflib/src/ixmlfile.cpp           | 13 ++++++++++---
 mdflib/src/mdfblock.h             |  1 +
 mdflib/src/mdffile.cpp            | 11 +++++++++--
 mdflib/src/mdfhelper.cpp          |  2 +-
 mdflib/src/mdfreader.cpp          | 17 ++++++++++++-----
 mdflib/src/mdfwriter.cpp          | 14 ++++++++++----
 mdflib/src/platform.h             | 31 +++++++++++++++++++++++++++++++
 mdflib/src/zlibutil.cpp           | 14 +++++++++++---
 mdflibrary/CMakeLists.txt         |  5 +++++
 mdflibrary_example/src/test.cpp   |  8 --------
 15 files changed, 127 insertions(+), 41 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8c367d6..a7233e5e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Copyright 2021 Ingemar Hedvall
 # SPDX-License-Identifier: MIT
-cmake_minimum_required(VERSION 3.20)
+cmake_minimum_required(VERSION 3.10)
 
 if("${CMAKE_TOOLCHAIN_FILE}" STREQUAL "")
   set(VCPKG OFF)
diff --git a/mdflib/src/at4block.cpp b/mdflib/src/at4block.cpp
index 18c4686f..d6d2ed71 100644
--- a/mdflib/src/at4block.cpp
+++ b/mdflib/src/at4block.cpp
@@ -5,7 +5,6 @@
 #include "at4block.h"
 
 #include <cerrno>
-#include <filesystem>
 #include <sstream>
 
 #include "mdf/cryptoutil.h"
@@ -14,7 +13,15 @@
 #include "mdf/zlibutil.h"
 #include "platform.h"
 
-using namespace std::filesystem;
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
+using namespace fs;
 
 namespace {
 
@@ -114,7 +121,7 @@ void At4Block::GetBlockProperty(BlockPropertyList& dest) const {
   std::string name;
   if (Link(kIndexFilename) > 0) {
     try {
-      std::filesystem::path p = std::filesystem::u8path(filename_);
+      fs::path p = fs::u8path(filename_);
       const auto& u8str = p.filename().u8string();
       name = std::string(u8str.begin(), u8str.end());
     } catch (const std::exception&) {
@@ -165,7 +172,7 @@ size_t At4Block::Write(std::FILE* file) {
   ByteArray data_buffer;
   try {
     path filename = u8path(filename_);
-    if (!std::filesystem::exists(filename)) {
+    if (!fs::exists(filename)) {
       MDF_ERROR() << "Attachment File doesn't exist. File: " << filename_;
       return 0;
     }
@@ -244,11 +251,11 @@ void At4Block::ReadData(std::FILE* file, const std::string& dest_file) const {
     }
   } else {
     // Need to copy the source file
-    std::filesystem::path s = std::filesystem::u8path(filename_);
-    std::filesystem::path d = std::filesystem::u8path(dest_file);
+    fs::path s = fs::u8path(filename_);
+    fs::path d = fs::u8path(dest_file);
     if (s != d) {
-      std::filesystem::copy_file(
-          s, d, std::filesystem::copy_options::overwrite_existing);
+      fs::copy_file(
+          s, d, fs::copy_options::overwrite_existing);
     }
   }
   if (flags_ & At4Flags::kUsingMd5) {
diff --git a/mdflib/src/cryptoutil.cpp b/mdflib/src/cryptoutil.cpp
index 191f05c2..3fd97f12 100644
--- a/mdflib/src/cryptoutil.cpp
+++ b/mdflib/src/cryptoutil.cpp
@@ -7,11 +7,19 @@
 #include <array>
 #include <cstdio>
 #include <cstring>
-#include <filesystem>
+#include <iomanip>
 
 #include "mdf/mdflogstream.h"
-
 #include "platform.h"
+
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 namespace {
 
 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
@@ -240,8 +248,8 @@ bool CreateMd5FileChecksum(const std::string &file, std::vector<uint8_t> &md5) {
   }
 
   try {
-    std::filesystem::path p = std::filesystem::u8path(file);
-    if (std::filesystem::exists(p)) {
+    fs::path p = fs::u8path(file);
+    if (fs::exists(p)) {
       std::FILE *f = nullptr;
       Platform::fileopen(&f, file.c_str(), "rb");
       if (f != nullptr) {
diff --git a/mdflib/src/expatxml.cpp b/mdflib/src/expatxml.cpp
index 62bb5ff0..6af11913 100644
--- a/mdflib/src/expatxml.cpp
+++ b/mdflib/src/expatxml.cpp
@@ -5,11 +5,18 @@
 #include "expatxml.h"
 
 #include <array>
-#include <filesystem>
 
 #include "mdf/mdflogstream.h"
 #include "platform.h"
 
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 namespace {
 void StartElementHandler(void *userData, const XML_Char *name,
                          const XML_Char **attributes) {
diff --git a/mdflib/src/ichannelconversion.cpp b/mdflib/src/ichannelconversion.cpp
index 57df3991..c10e796a 100644
--- a/mdflib/src/ichannelconversion.cpp
+++ b/mdflib/src/ichannelconversion.cpp
@@ -348,7 +348,7 @@ void IChannelConversion::ParameterUint(uint16_t index, uint64_t parameter) {
       return;
   }
   while (index >= value_list_.size()) {
-    value_list_.emplace_back(0ULL);
+    value_list_.emplace_back(static_cast<uint64_t>(0));
   }
   value_list_[index] = parameter;
 }
diff --git a/mdflib/src/ixmlfile.cpp b/mdflib/src/ixmlfile.cpp
index 52542a9d..65af35f5 100644
--- a/mdflib/src/ixmlfile.cpp
+++ b/mdflib/src/ixmlfile.cpp
@@ -4,7 +4,6 @@
  */
 #include "ixmlfile.h"
 
-#include <filesystem>
 #include <fstream>
 
 #include "expatxml.h"
@@ -12,11 +11,19 @@
 #include "writexml.h"
 #include "xmlnode.h"
 
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 namespace mdf {
 
 std::string IXmlFile::FileNameWithoutPath() const {
   try {
-    auto filename = std::filesystem::u8path(filename_).stem().u8string();
+    auto filename = fs::u8path(filename_).stem().u8string();
     return std::string(filename.begin(), filename.end());
   } catch (const std::exception &error) {
     MDF_ERROR() << "Invalid path. File: " << filename_
@@ -65,7 +72,7 @@ bool IXmlFile::WriteFile() {
     return false;
   }
   try {
-    std::ofstream file(std::filesystem::u8path(filename_),
+    std::ofstream file(fs::u8path(filename_),
                        std::ofstream::out | std::ofstream::trunc);
     if (!file.is_open()) {
       MDF_ERROR() << "Couldn't open file for writing. File: " << filename_;
diff --git a/mdflib/src/mdfblock.h b/mdflib/src/mdfblock.h
index c9c0cf76..f6abfe0c 100644
--- a/mdflib/src/mdfblock.h
+++ b/mdflib/src/mdfblock.h
@@ -15,6 +15,7 @@
 #include "blockproperty.h"
 #include "littlebuffer.h"
 #include "mdf/imetadata.h"
+#include "platform.h"
 
 namespace mdf::detail {
 
diff --git a/mdflib/src/mdffile.cpp b/mdflib/src/mdffile.cpp
index 35d6a5ee..26ca18e7 100644
--- a/mdflib/src/mdffile.cpp
+++ b/mdflib/src/mdffile.cpp
@@ -4,12 +4,19 @@
  */
 #include "mdf/mdffile.h"
 
-#include <filesystem>
 #include <string>
 
 #include "at4block.h"
 #include "mdf/mdflogstream.h"
 
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 namespace mdf {
 
 int MdfFile::MainVersion() const {
@@ -44,7 +51,7 @@ void MdfFile::FileName(const std::string& filename) {
   filename_ = filename;
   if (name_.empty()) {
     try {
-      auto name = std::filesystem::u8path(filename).stem().u8string();
+      auto name = fs::u8path(filename).stem().u8string();
       name_ = std::string(name.begin(), name.end());
     } catch (const std::exception& err) {
       MDF_ERROR() << "Invalid file name detected. Error: " << err.what()
diff --git a/mdflib/src/mdfhelper.cpp b/mdflib/src/mdfhelper.cpp
index 801e8c5b..b4131174 100644
--- a/mdflib/src/mdfhelper.cpp
+++ b/mdflib/src/mdfhelper.cpp
@@ -10,9 +10,9 @@
 #include <codecvt>
 #include <cstring>
 #include <ctime>
-#include <filesystem>
 #include <iomanip>
 #include <sstream>
+#include <chrono>
 
 #include "littlebuffer.h"
 
diff --git a/mdflib/src/mdfreader.cpp b/mdflib/src/mdfreader.cpp
index bc460c73..ac2ac128 100644
--- a/mdflib/src/mdfreader.cpp
+++ b/mdflib/src/mdfreader.cpp
@@ -4,9 +4,7 @@
  */
 #include "mdf/mdfreader.h"
 
-
 #include <cstdio>
-#include <filesystem>
 #include <string>
 #include <thread>
 #include <vector>
@@ -21,6 +19,15 @@
 #include "cn4block.h"
 #include "sr4block.h"
 #include "sr3block.h"
+
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 using namespace std::chrono_literals;
 
 namespace mdf {
@@ -201,8 +208,8 @@ MdfReader::MdfReader(const std::string &filename) : filename_(filename) {
   // Need to create MDF3 of MDF4 file
   bool bExist = false;
   try {
-    std::filesystem::path p = std::filesystem::u8path(filename_);
-    if (std::filesystem::exists(p)) {
+    fs::path p = fs::u8path(filename_);
+    if (fs::exists(p)) {
       bExist = true;
     }
   } catch (const std::exception &error) {
@@ -251,7 +258,7 @@ MdfReader::~MdfReader() { Close(); }
 
 std::string MdfReader::ShortName() const {
   try {
-    auto filename = std::filesystem::u8path(filename_).stem().u8string();
+    auto filename = fs::u8path(filename_).stem().u8string();
     return std::string(filename.begin(), filename.end());
   } catch (const std::exception &) {
   }
diff --git a/mdflib/src/mdfwriter.cpp b/mdflib/src/mdfwriter.cpp
index 8ebdec95..27aa02e2 100644
--- a/mdflib/src/mdfwriter.cpp
+++ b/mdflib/src/mdfwriter.cpp
@@ -12,14 +12,20 @@
 #include <algorithm>
 #include <chrono>
 #include <cstdio>
-#include <filesystem>
-
 
 #include "dg3block.h"
 #include "mdfblock.h"
 #include "platform.h"
 
-using namespace std::filesystem;
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
+using namespace fs;
 using namespace std::chrono_literals;
 
 namespace {
@@ -111,7 +117,7 @@ bool MdfWriter::Init(const std::string& filename) {
   }
   std::FILE* file = nullptr;
   try {
-    if (std::filesystem::exists(filename_)) {
+    if (fs::exists(filename_)) {
       // Read in existing file so we can append to it
 
       detail::OpenMdfFile(file, filename_, "rb");
diff --git a/mdflib/src/platform.h b/mdflib/src/platform.h
index 00312f34..4f941b28 100644
--- a/mdflib/src/platform.h
+++ b/mdflib/src/platform.h
@@ -7,6 +7,37 @@
 #include <cstdint>
 #include <cstdio>
 
+#ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+
+#if defined(__cpp_lib_filesystem)
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
+#elif defined(__cpp_lib_experimental_filesystem)
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
+#elif !defined(__has_include)
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
+#elif __has_include(<filesystem>)
+
+#ifdef _MSC_VER
+#if __has_include(<yvals_core.h>)
+#include <yvals_core.h>
+#if defined(_HAS_CXX17) && _HAS_CXX17
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
+#endif
+#endif
+#ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
+#endif
+#else  // #ifdef _MSC_VER
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 0
+#endif
+
+#elif __has_include(<experimental/filesystem>)
+#define INCLUDE_STD_FILESYSTEM_EXPERIMENTAL 1
+#else
+#error Could not find system header "<filesystem>" or "<experimental/filesystem>"
+#endif
+#endif  // #ifndef INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+
 namespace Platform {
 int stricmp(const char *__s1, const char *__s2);
 int strnicmp(const char *__s1, const char *__s2, size_t __n);
diff --git a/mdflib/src/zlibutil.cpp b/mdflib/src/zlibutil.cpp
index 387680b4..e57f163a 100644
--- a/mdflib/src/zlibutil.cpp
+++ b/mdflib/src/zlibutil.cpp
@@ -8,10 +8,18 @@
 
 #include <cstdint>
 #include <cstring>
-#include <filesystem>
 #include <string>
 
 #include "platform.h"
+
+#if INCLUDE_STD_FILESYSTEM_EXPERIMENTAL
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
+#include <filesystem>
+namespace fs = std::filesystem;
+#endif
+
 namespace {
 constexpr size_t kZlibChunk = 16384;
 }
@@ -76,8 +84,8 @@ bool Deflate(FILE* in, FILE* out) {
 
 bool Deflate(const std::string& filename, ByteArray& buf_out) {
   try {
-    std::filesystem::path name = std::filesystem::u8path(filename);
-    auto size = std::filesystem::file_size(name);
+    fs::path name = fs::u8path(filename);
+    auto size = fs::file_size(name);
 
     std::FILE* file = nullptr;
     Platform::fileopen(&file, filename.c_str(), "rb");
diff --git a/mdflibrary/CMakeLists.txt b/mdflibrary/CMakeLists.txt
index 92f6b505..14eda5d5 100644
--- a/mdflibrary/CMakeLists.txt
+++ b/mdflibrary/CMakeLists.txt
@@ -44,6 +44,11 @@ endif()
 
 target_link_libraries(mdflibrary PRIVATE mdf)
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 7.3 AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0 AND NOT MINGW)
+  # fix for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90050
+  target_link_libraries(mdflibrary PRIVATE pthread stdc++fs)
+endif()
+
 target_include_directories(
   mdflibrary PUBLIC $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>)
 
diff --git a/mdflibrary_example/src/test.cpp b/mdflibrary_example/src/test.cpp
index 321d4fd5..f9453c9c 100644
--- a/mdflibrary_example/src/test.cpp
+++ b/mdflibrary_example/src/test.cpp
@@ -2,7 +2,6 @@
  * Copyright 2023 Simplxs
  * SPDX-License-Identifier: MIT
  */
-#include <filesystem>
 #include <iostream>
 #include <sstream>
 
@@ -13,9 +12,6 @@ using namespace MdfLibrary::ExportFunctions;
 void c_example() {
   std::cout << "C example" << std::endl;
 
-  if (std::filesystem::exists("test_c.mf4"))
-    std::filesystem::remove("test_c.mf4");
-
   {
     std::cout << "Write" << std::endl;
     auto* Writer = MdfWriterInit(MdfWriterType::Mdf4Basic, "test_c.mf4");
@@ -195,8 +191,6 @@ void c_example() {
 void cpp_example() {
   std::cout << "C++ example" << std::endl;
   {
-    if (std::filesystem::exists("test_cpp.mf4"))
-      std::filesystem::remove("test_cpp.mf4");
 
     std::cout << "Write Basic" << std::endl;
     MdfWriter Writer(MdfWriterType::Mdf4Basic, "test_cpp.mf4");
@@ -310,8 +304,6 @@ void cpp_example() {
   }
 
   {
-    if (std::filesystem::exists("test_can_cpp.mf4"))
-      std::filesystem::remove("test_can_cpp.mf4");
 
     std::cout << "Write Can" << std::endl;
     MdfWriter Writer(MdfWriterType::MdfBusLogger, "test_can_cpp.mf4");