Starts pushing towards figuring out a proper infrastructure for mass storage.

Storage/MassStorage/SCSI/Target.cpp

@@ -0,0 +1,41 @@
+//
+//  Target.cpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 17/08/2019.
+//  Copyright © 2019 Thomas Harte. All rights reserved.
+//
+
+#include "Target.hpp"
+
+using namespace SCSI::Target;
+
+CommandState::CommandState(const std::vector<uint8_t> &data) : data_(data) {}
+
+uint32_t CommandState::address() {
+	switch(data_.size()) {
+		default:	return 0;
+		case 6:
+			return
+				(uint32_t(data_[1]) << 16) |
+				(uint32_t(data_[2]) << 8) |
+				uint32_t(data_[3]);
+		case 10:
+		case 12:
+			return
+				(uint32_t(data_[1]) << 24) |
+				(uint32_t(data_[2]) << 16) |
+				(uint32_t(data_[3]) << 8) |
+				uint32_t(data_[4]);
+	}
+}
+
+uint16_t CommandState::number_of_blocks() {
+	switch(data_.size()) {
+		default:	return 0;
+		case 6:
+			return uint16_t(data_[4]);
+		case 10:
+			return uint16_t((data_[7] << 8) | data_[8]);
+	}
+}