mirror of https://github.com/akuker/RASCSI.git
91 lines
2.4 KiB
C++
91 lines
2.4 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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//
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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 "filepath.h"
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#include "disk_image/disk_image_handle.h"
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// Number of tracks to cache
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#define CacheMax 16
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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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DWORD length; // Data buffer length
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BYTE *buffer; // Data buffer
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BOOL init; // Is it initilized?
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BOOL changed; // Changed flag
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DWORD 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 Filepath& path);
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bool Save(const Filepath& path);
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// Read / Write
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bool ReadSector(BYTE *buf, int sec) const; // Sector Read
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bool WriteSector(const BYTE *buf, int sec); // Sector Write
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int GetTrack() const { return dt.track; } // Get track
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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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DWORD serial; // Serial
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} cache_t;
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public:
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DiskCache(const Filepath& 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(BYTE *buf, int block) override; // Sector Read
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bool WriteSector(const BYTE *buf, int block) override; // Sector Write
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bool GetCache(int index, int& track, DWORD& serial) const override; // Get cache information
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private:
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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 = NULL); // Load track
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void UpdateSerialNumber(); // Update serial number
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// Internal data
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cache_t cache[CacheMax]; // Cache management
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};
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