feat(*): rewritten the project with C/C++ (#1172)

src/fsutils.cpp

@@ -0,0 +1,94 @@
+#include <filesystem>
+
+#if _WIN32
+#include <windows.h>
+#include <cwchar>
+#else
+#include <unistd.h>
+#include <cstring>
+#endif
+
+#include "fsutils.h"
+
+#if _WIN32
+std::filesystem::path get_executable_directory() {
+    std::vector<wchar_t> filepath(MAX_PATH);
+
+    // Get the executable path, expanding the buffer if necessary
+    DWORD size = GetModuleFileNameW(NULL, filepath.data(), static_cast<DWORD>(filepath.size()));
+    if (size == 0) {
+        fprintf(stderr, "Error getting executable path: %lu\n", GetLastError());
+        return std::filesystem::path();
+    }
+
+    // Resize the buffer if necessary
+    while (size >= filepath.size()) {
+        filepath.resize(filepath.size() * 2);
+        size = GetModuleFileNameW(NULL, filepath.data(), static_cast<DWORD>(filepath.size()));
+        if (size == 0) {
+            fprintf(stderr, "Error getting executable path: %lu\n", GetLastError());
+            return std::filesystem::path();
+        }
+    }
+
+    // Create a std::filesystem::path from the filepath and return its parent path
+    std::filesystem::path execpath(filepath.data());
+    return execpath.parent_path();
+}
+#else   // _WIN32
+std::filesystem::path get_executable_directory() {
+    std::error_code ec;
+    std::filesystem::path filepath = std::filesystem::read_symlink("/proc/self/exe", ec);
+
+    if (ec) {
+        fprintf(stderr, "Error reading /proc/self/exe: %s\n", ec.message().c_str());
+        return std::filesystem::path();
+    }
+
+    return filepath.parent_path();
+}
+#endif  // _WIN32
+
+bool filepath_is_readable(const std::filesystem::path &path) {
+#if _WIN32
+    FILE *fp = _wfopen(path.c_str(), L"rb");
+#else   // _WIN32
+    FILE *fp = fopen(path.c_str(), "rb");
+#endif  // _WIN32
+    if (!fp) {
+        return false;
+    }
+
+    fclose(fp);
+    return true;
+}
+
+std::filesystem::path find_resource_file(const std::filesystem::path &path) {
+    if (filepath_is_readable(path)) {
+        return path;
+    }
+
+    if (filepath_is_readable(std::filesystem::path("/usr/share/video2x/") / path)) {
+        return std::filesystem::path("/usr/share/video2x/") / path;
+    }
+
+    return get_executable_directory() / path;
+}
+
+std::string path_to_string(const std::filesystem::path &path) {
+#if _WIN32
+    std::wstring wide_path = path.wstring();
+    int buffer_size =
+        WideCharToMultiByte(CP_UTF8, 0, wide_path.c_str(), -1, nullptr, 0, nullptr, nullptr);
+    if (buffer_size == 0) {
+        return std::string();
+    }
+    std::vector<char> buffer(buffer_size);
+    WideCharToMultiByte(
+        CP_UTF8, 0, wide_path.c_str(), -1, buffer.data(), buffer_size, nullptr, nullptr
+    );
+    return std::string(buffer.data());
+#else
+    return path.string();
+#endif
+}