Initial commit

Common/FileRead.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include <filesystem>
+#include <fstream>
+
+namespace LXC::Util
+{
+	struct FileReadError
+	{
+		enum Reason
+		{
+			FileNotFound,
+			PermissionDenied,
+			NotAFile
+		};
+
+		FileReadError(const std::filesystem::path& _path, Reason _reason)
+			: path(_path), reason(_reason)
+		{}
+
+		std::filesystem::path path;
+		Reason reason;
+	};
+
+	inline ReturnVal<std::string, FileReadError> ReadFile(const std::filesystem::path& filepath)
+	{
+		// Checks the file exists //
+		if (!std::filesystem::exists(filepath))
+			return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::FileNotFound));
+
+		// Checks it is a regular file //
+		if (!std::filesystem::is_regular_file(filepath))
+			return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::NotAFile));
+
+		// Checks it can open the file //
+		std::ifstream file(filepath, std::ios::binary | std::ios::ate);
+		if (!file)
+			return FunctionFail(FileReadError(std::filesystem::absolute(filepath), FileReadError::PermissionDenied));
+
+		// Copies the file to the output string //
+		const std::streamsize len = file.tellg();
+		file.seekg(0, std::ios::beg);
+
+		std::string contents(len, '\0');
+		file.read(&contents[0], len);
+
+		return contents;
+	}
+}