inital commit (message v3)

solanaceae/message3/file_rw_file.hpp

@@ -0,0 +1,60 @@
+#pragma once
+
+#include "./file.hpp"
+
+#include <fstream>
+
+struct FileRWFile : public FileI {
+	std::fstream _file;
+
+	//FileWFile(std::string_view file_path, uint64_t file_size) : _file(static_cast<std::string>(file_path), std::ios::binary) {
+		//_file_size = file_size;
+
+		//if (!_file.is_open()) {
+			//return; // TODO: error
+		//}
+	//}
+
+	virtual ~FileRWFile(void) {}
+
+	bool isGood(void) override {
+		return _file.is_open() && _file.good();
+	}
+
+	std::vector<uint8_t> read(uint64_t pos, uint32_t size) override {
+		if (pos >= _file_size) {
+			return {};
+		}
+
+		// TODO: error check
+		_file.seekg(pos);
+
+		// TODO: optimize
+		std::vector<uint8_t> chunk;
+		int read_char;
+		for (size_t i = 0; i < size && (_file_size == 0 || i+pos < _file_size) && (read_char = _file.get()) != std::ifstream::traits_type::eof(); i++) {
+			chunk.push_back(read_char);
+		}
+
+		_bytes_read += chunk.size();
+
+		return chunk;
+	}
+
+	bool write(uint64_t pos, const std::vector<uint8_t>& data) override {
+		if (pos >= _file_size) {
+			return false;
+		}
+
+		// if out-of-order, seek
+		if (_file.tellp() != int64_t(pos)) {
+			// TODO: error check
+			_file.seekp(pos);
+		}
+
+		_file.write(reinterpret_cast<const char*>(data.data()), data.size());
+
+		return _file.good();
+	}
+};
+