inital commit (message v3)

solanaceae/message3/file_r_file.hpp

@@ -0,0 +1,53 @@
+#pragma once
+
+#include "./file.hpp"
+
+#include <fstream>
+
+struct FileRFile : public FileI {
+	std::ifstream _file;
+
+	FileRFile(std::string_view file_path) : _file(static_cast<std::string>(file_path), std::ios::binary) {
+		if (!_file.is_open()) {
+			return; // TODO: error
+		}
+
+		// figure out size
+		_file.seekg(0, _file.end);
+		_file_size = _file.tellg();
+		_file.seekg(0, _file.beg);
+	}
+
+	//FileRFile(std::ifstream&& other_file) : _file(std::move(other_file)) {}
+	//FileRFile(std::ifstream&& other_file, size_t file_size) : _file(std::move(other_file)), _file_size(file_size) {}
+
+	virtual ~FileRFile(void) {}
+
+	bool isGood(void) override {
+		return _file.is_open() && _file.good();
+	}
+
+	std::vector<uint8_t> read(uint64_t pos, uint32_t size) override {
+		if (_file_size > 0 && 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;
+	}
+
+	// read only
+	bool write(uint64_t, const std::vector<uint8_t>&) override { return false; }
+};
+