RASCSI/cpp/controllers/phase_handler.h

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2022-2023 Uwe Seimet
//
//---------------------------------------------------------------------------
#pragma once
#include "shared/scsi.h"
#include "shared/piscsi_exceptions.h"
#include <unordered_map>
#include <functional>
using namespace scsi_defs;
class PhaseHandler
{
phase_t phase = phase_t::busfree;
public:
PhaseHandler() = default;
virtual ~PhaseHandler() = default;
virtual void BusFree() = 0;
virtual void Selection() = 0;
virtual void Command() = 0;
virtual void Status() = 0;
virtual void DataIn() = 0;
virtual void DataOut() = 0;
virtual void MsgIn() = 0;
virtual void MsgOut() = 0;
virtual bool Process(int) = 0;
protected:
phase_t GetPhase() const { return phase; }
void SetPhase(phase_t p) { phase = p; }
bool IsSelection() const { return phase == phase_t::selection; }
bool IsBusFree() const { return phase == phase_t::busfree; }
bool IsCommand() const { return phase == phase_t::command; }
bool IsStatus() const { return phase == phase_t::status; }
bool IsDataIn() const { return phase == phase_t::datain; }
bool IsDataOut() const { return phase == phase_t::dataout; }
bool IsMsgIn() const { return phase == phase_t::msgin; }
bool IsMsgOut() const { return phase == phase_t::msgout; }
void ProcessPhase() const
{
try {
phase_executors.at(phase)();
}
catch(const out_of_range&) {
throw scsi_exception(sense_key::aborted_command);
}
}
private:
const unordered_map<phase_t, function<void()>> phase_executors = {
{ phase_t::busfree, [this] () { BusFree(); } },
{ phase_t::selection, [this] () { Selection(); } },
{ phase_t::dataout, [this] () { DataOut(); } },
{ phase_t::datain, [this] () { DataIn(); } },
{ phase_t::command, [this] () { Command(); } },
{ phase_t::status, [this] () { Status(); } },
{ phase_t::msgout, [this] () { MsgOut(); } },
{ phase_t::msgin, [this] () { MsgIn(); } },
};
};