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// license:BSD-3-Clause
// copyright-holders:Manuel Abadia
#ifndef MAME_MACHINE_GAELCRPT_H
#define MAME_MACHINE_GAELCRPT_H
#pragma once
DECLARE_DEVICE_TYPE(GAELCO_VRAM_ENCRYPTION, gaelco_vram_encryption_device)
class gaelco_vram_encryption_device : public device_t
{
public:
// construction/destruction
gaelco_vram_encryption_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
void set_params(uint8_t param1, uint16_t param2) { m_param1 = param1; m_param2 = param2; }
uint16_t gaelco_decrypt(cpu_device &cpu, int offset, int data);
protected:
virtual void device_start() override;
virtual void device_reset() override;
private:
int decrypt(int const enc_prev_word, int const dec_prev_word, int const enc_word);
int32_t m_lastpc = 0, m_lastoffset = 0, m_lastencword = 0, m_lastdecword = 0;
// config
uint8_t m_param1;
uint16_t m_param2;
};
#endif // MAME_MACHINE_GAELCRPT_H
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