mirror of https://github.com/akuker/RASCSI.git
97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
//---------------------------------------------------------------------------
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//
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// X68000 EMULATOR "XM6"
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//
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// Copyright (C) 2001-2006 ＰＩ．(ytanaka@ipc-tokai.or.jp)
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// Copyright (C) 2014-2020 GIMONS
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// Copyright (C) 2022-2023 akuker
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//
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// XM6i
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// Copyright (C) 2010-2015 isaki@NetBSD.org
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//
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// Imported sava's Anex86/T98Next image and MO format support patch.
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// Comments translated to english by akuker.
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//
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// [ DiskTrack and DiskCache ]
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "disk_image/disk_image_handle.h"
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#include <string>
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using namespace std;
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class DiskTrack
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{
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private:
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struct {
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int track; // Track Number
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int size; // Sector Size (8=256, 9=512, 10=1024, 11=2048, 12=4096)
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int sectors; // Number of sectors(<0x100)
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uint32_t length; // Data buffer length
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uint8_t* buffer; // Data buffer
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bool init; // Is it initilized?
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bool changed; // Changed flag
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uint32_t maplen; // Changed map length
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bool* changemap; // Changed map
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bool raw; // RAW mode flag
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off_t imgoffset; // Offset to actual data
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} dt;
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public:
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DiskTrack();
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~DiskTrack();
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private:
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friend class DiskCache;
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void Init(int track, int size, int sectors, bool raw = false, off_t imgoff = 0);
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bool Load(const string& path);
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bool Save(const string& path);
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// Read / Write
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bool ReadSector(vector<uint8_t>& buf, int sec) const; // Sector Read
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bool WriteSector(const vector<uint8_t>& buf, int sec); // Sector Write
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// Get track
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int GetTrack() const
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{
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return dt.track;
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}
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};
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class DiskCache : public DiskImageHandle
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{
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public:
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// Internal data definition
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typedef struct {
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DiskTrack* disktrk; // Disk Track
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uint32_t serial; // Serial
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} cache_t;
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DiskCache(const string& path, int size, uint32_t blocks, off_t imgoff = 0);
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~DiskCache();
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// Access
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bool Save() override; // Save and release all
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bool ReadSector(vector<uint8_t>& buf, int block) override; // Sector Read
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bool WriteSector(const vector<uint8_t>& buf, int block) override; // Sector Write
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bool GetCache(int index, int& track, uint32_t& serial) const override; // Get cache information
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private:
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// Number of tracks to cache
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static const int CacheMax = 16;
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// Internal Management
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void Clear(); // Clear all tracks
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DiskTrack* Assign(int track); // Load track
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bool Load(int index, int track, DiskTrack* disktrk = nullptr); // Load track
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void UpdateSerialNumber(); // Update serial number
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// Internal data
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array<cache_t, CacheMax> cache; // Cache management
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uint32_t serial; // Last serial number
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}; |