Move IO functions into .cpp files.

firmware/application/io_wave.cpp

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2016 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "io_wave.hpp"
+
+Optional<File::Error> WAVFileWriter::create(
+	const std::filesystem::path& filename,
+	size_t sampling_rate
+) {
+	sampling_rate = sampling_rate;
+	const auto create_error = FileWriter::create(filename);
+	if( create_error.is_valid() ) {
+		return create_error;
+	} else {
+		return update_header();
+	}
+}
+
+Optional<File::Error> WAVFileWriter::update_header() {
+	header_t header { sampling_rate, bytes_written };
+	const auto seek_0_result = file.seek(0);
+	if( seek_0_result.is_error() ) {
+		return seek_0_result.error();
+	}
+	const auto old_position = seek_0_result.value();
+	const auto write_result = file.write(&header, sizeof(header));
+	if( write_result.is_error() ) {
+		return write_result.error();
+	}
+	const auto seek_old_result = file.seek(old_position);
+	if( seek_old_result.is_error() ) {
+		return seek_old_result.error();
+	}
+	return { };
+}