mirror of https://github.com/akuker/RASCSI.git
576 lines
11 KiB
C++
576 lines
11 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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// Copyright (C) 2010 Y.Sugahara
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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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#include "os.h"
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#include "log.h"
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#include "fileio.h"
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#include "disk_track_cache.h"
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//===========================================================================
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//
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// Disk Track
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//
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//===========================================================================
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DiskTrack::DiskTrack()
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{
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// Initialization of internal information
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dt.track = 0;
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dt.size = 0;
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dt.sectors = 0;
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dt.raw = FALSE;
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dt.init = FALSE;
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dt.changed = FALSE;
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dt.length = 0;
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dt.buffer = NULL;
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dt.maplen = 0;
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dt.changemap = NULL;
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dt.imgoffset = 0;
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}
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DiskTrack::~DiskTrack()
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{
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// Release memory, but do not save automatically
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if (dt.buffer) {
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free(dt.buffer);
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dt.buffer = NULL;
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}
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if (dt.changemap) {
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free(dt.changemap);
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dt.changemap = NULL;
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}
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}
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void DiskTrack::Init(int track, int size, int sectors, BOOL raw, off_t imgoff)
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{
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ASSERT(track >= 0);
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ASSERT((sectors > 0) && (sectors <= 0x100));
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ASSERT(imgoff >= 0);
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// Set Parameters
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dt.track = track;
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dt.size = size;
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dt.sectors = sectors;
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dt.raw = raw;
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// Not initialized (needs to be loaded)
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dt.init = FALSE;
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// Not Changed
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dt.changed = FALSE;
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// Offset to actual data
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dt.imgoffset = imgoff;
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}
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bool DiskTrack::Load(const Filepath& path)
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{
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// Not needed if already loaded
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if (dt.init) {
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ASSERT(dt.buffer);
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ASSERT(dt.changemap);
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return true;
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}
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// Calculate offset (previous tracks are considered to hold 256 sectors)
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off_t offset = ((off_t)dt.track << 8);
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if (dt.raw) {
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ASSERT(dt.size == 11);
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offset *= 0x930;
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offset += 0x10;
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} else {
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offset <<= dt.size;
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}
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// Add offset to real image
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offset += dt.imgoffset;
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// Calculate length (data size of this track)
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int length = dt.sectors << dt.size;
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// Allocate buffer memory
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ASSERT((dt.sectors > 0) && (dt.sectors <= 0x100));
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if (dt.buffer == NULL) {
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if (posix_memalign((void **)&dt.buffer, 512, ((length + 511) / 512) * 512)) {
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LOGWARN("%s posix_memalign failed", __PRETTY_FUNCTION__);
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}
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dt.length = length;
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}
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if (!dt.buffer) {
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return false;
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}
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// Reallocate if the buffer length is different
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if (dt.length != (DWORD)length) {
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free(dt.buffer);
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if (posix_memalign((void **)&dt.buffer, 512, ((length + 511) / 512) * 512)) {
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LOGWARN("%s posix_memalign failed", __PRETTY_FUNCTION__);
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}
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dt.length = length;
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}
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// Reserve change map memory
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if (dt.changemap == NULL) {
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dt.changemap = (BOOL *)malloc(dt.sectors * sizeof(BOOL));
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dt.maplen = dt.sectors;
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}
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if (!dt.changemap) {
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return false;
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}
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// Reallocate if the buffer length is different
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if (dt.maplen != (DWORD)dt.sectors) {
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free(dt.changemap);
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dt.changemap = (BOOL *)malloc(dt.sectors * sizeof(BOOL));
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dt.maplen = dt.sectors;
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}
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// Clear changemap
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memset(dt.changemap, 0x00, dt.sectors * sizeof(BOOL));
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// Read from File
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Fileio fio;
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if (!fio.OpenDIO(path, Fileio::ReadOnly)) {
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return false;
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}
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if (dt.raw) {
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// Split Reading
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for (int i = 0; i < dt.sectors; i++) {
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// Seek
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if (!fio.Seek(offset)) {
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fio.Close();
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return false;
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}
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// Read
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if (!fio.Read(&dt.buffer[i << dt.size], 1 << dt.size)) {
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fio.Close();
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return false;
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}
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// Next offset
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offset += 0x930;
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}
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} else {
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// Continuous reading
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if (!fio.Seek(offset)) {
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fio.Close();
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return false;
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}
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if (!fio.Read(dt.buffer, length)) {
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fio.Close();
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return false;
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}
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}
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fio.Close();
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// Set a flag and end normally
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dt.init = TRUE;
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dt.changed = FALSE;
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return true;
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}
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bool DiskTrack::Save(const Filepath& path)
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{
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// Not needed if not initialized
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if (!dt.init) {
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return true;
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}
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// Not needed unless changed
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if (!dt.changed) {
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return true;
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}
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// Need to write
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ASSERT(dt.buffer);
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ASSERT(dt.changemap);
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ASSERT((dt.sectors > 0) && (dt.sectors <= 0x100));
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// Writing in RAW mode is not allowed
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ASSERT(!dt.raw);
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// Calculate offset (previous tracks are considered to hold 256 sectors)
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off_t offset = ((off_t)dt.track << 8);
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offset <<= dt.size;
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// Add offset to real image
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offset += dt.imgoffset;
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// Calculate length per sector
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int length = 1 << dt.size;
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// Open file
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Fileio fio;
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if (!fio.Open(path, Fileio::ReadWrite)) {
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return false;
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}
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// Partial write loop
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int total;
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for (int i = 0; i < dt.sectors;) {
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// If changed
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if (dt.changemap[i]) {
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// Initialize write size
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total = 0;
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// Seek
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if (!fio.Seek(offset + ((off_t)i << dt.size))) {
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fio.Close();
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return false;
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}
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// Consectutive sector length
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int j;
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for (j = i; j < dt.sectors; j++) {
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// end when interrupted
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if (!dt.changemap[j]) {
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break;
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}
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// Add one sector
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total += length;
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}
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// Write
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if (!fio.Write(&dt.buffer[i << dt.size], total)) {
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fio.Close();
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return false;
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}
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// To unmodified sector
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i = j;
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} else {
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// Next Sector
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i++;
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}
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}
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// Close
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fio.Close();
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// Drop the change flag and exit
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memset(dt.changemap, 0x00, dt.sectors * sizeof(BOOL));
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dt.changed = FALSE;
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return true;
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}
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bool DiskTrack::ReadSector(BYTE *buf, int sec) const
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{
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ASSERT(buf);
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ASSERT((sec >= 0) & (sec < 0x100));
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LOGTRACE("%s reading sector: %d", __PRETTY_FUNCTION__,sec);
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// Error if not initialized
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if (!dt.init) {
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return false;
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}
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// // Error if the number of sectors exceeds the valid number
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if (sec >= dt.sectors) {
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return false;
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}
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// Copy
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ASSERT(dt.buffer);
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ASSERT((dt.sectors > 0) && (dt.sectors <= 0x100));
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memcpy(buf, &dt.buffer[(off_t)sec << dt.size], (off_t)1 << dt.size);
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// Success
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return true;
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}
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bool DiskTrack::WriteSector(const BYTE *buf, int sec)
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{
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ASSERT(buf);
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ASSERT((sec >= 0) & (sec < 0x100));
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ASSERT(!dt.raw);
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// Error if not initialized
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if (!dt.init) {
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return false;
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}
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// // Error if the number of sectors exceeds the valid number
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if (sec >= dt.sectors) {
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return false;
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}
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// Calculate offset and length
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int offset = sec << dt.size;
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int length = 1 << dt.size;
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// Compare
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ASSERT(dt.buffer);
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ASSERT((dt.sectors > 0) && (dt.sectors <= 0x100));
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if (memcmp(buf, &dt.buffer[offset], length) == 0) {
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// Exit normally since it's attempting to write the same thing
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return true;
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}
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// Copy, change
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memcpy(&dt.buffer[offset], buf, length);
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dt.changemap[sec] = TRUE;
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dt.changed = TRUE;
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// Success
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return true;
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}
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//===========================================================================
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//
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// Disk Cache
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//
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//===========================================================================
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DiskCache::DiskCache(const Filepath& path, int size, uint32_t blocks, off_t imgoff) : DiskImageHandle(path, size, blocks, imgoff)
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{
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ASSERT(blocks > 0);
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ASSERT(imgoff >= 0);
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// Cache work
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for (int i = 0; i < CacheMax; i++) {
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cache[i].disktrk = NULL;
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cache[i].serial = 0;
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}
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}
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DiskCache::~DiskCache()
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{
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// Clear the track
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Clear();
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}
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bool DiskCache::Save()
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{
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// Save track
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for (int i = 0; i < CacheMax; i++) {
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// Is it a valid track?
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if (cache[i].disktrk) {
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// Save
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if (!cache[i].disktrk->Save(sec_path)) {
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return false;
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}
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}
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}
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return true;
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}
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//---------------------------------------------------------------------------
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//
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// Get disk cache information
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//
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//---------------------------------------------------------------------------
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bool DiskCache::GetCache(int index, int& track, DWORD& aserial) const
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{
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ASSERT((index >= 0) && (index < CacheMax));
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// false if unused
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if (!cache[index].disktrk) {
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return false;
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}
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// Set track and serial
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track = cache[index].disktrk->GetTrack();
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aserial = cache[index].serial;
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return true;
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}
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void DiskCache::Clear()
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{
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// Free the cache
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for (int i = 0; i < CacheMax; i++) {
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if (cache[i].disktrk) {
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delete cache[i].disktrk;
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cache[i].disktrk = NULL;
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}
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}
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}
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bool DiskCache::ReadSector(BYTE *buf, int block)
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{
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ASSERT(sec_size != 0);
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// Update first
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UpdateSerialNumber();
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// Calculate track (fixed to 256 sectors/track)
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int track = block >> 8;
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// Get the track data
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DiskTrack *disktrk = Assign(track);
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if (!disktrk) {
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return false;
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}
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// Read the track data to the cache
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return disktrk->ReadSector(buf, block & 0xff);
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}
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bool DiskCache::WriteSector(const BYTE *buf, int block)
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{
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ASSERT(sec_size != 0);
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// Update first
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UpdateSerialNumber();
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// Calculate track (fixed to 256 sectors/track)
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int track = block >> 8;
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// Get that track data
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DiskTrack *disktrk = Assign(track);
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if (!disktrk) {
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return false;
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}
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// Write the data to the cache
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return disktrk->WriteSector(buf, block & 0xff);
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}
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//---------------------------------------------------------------------------
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//
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// Track Assignment
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//
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//---------------------------------------------------------------------------
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DiskTrack* DiskCache::Assign(int track)
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{
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ASSERT(sec_size != 0);
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ASSERT(track >= 0);
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// First, check if it is already assigned
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for (int i = 0; i < CacheMax; i++) {
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if (cache[i].disktrk) {
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if (cache[i].disktrk->GetTrack() == track) {
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// Track match
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cache[i].serial = serial;
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return cache[i].disktrk;
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}
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}
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}
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// Next, check for empty
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for (int i = 0; i < CacheMax; i++) {
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if (!cache[i].disktrk) {
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// Try loading
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if (Load(i, track)) {
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// Success loading
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cache[i].serial = serial;
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return cache[i].disktrk;
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}
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// Load failed
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return NULL;
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}
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}
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// Finally, find the youngest serial number and delete it
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// Set index 0 as candidate c
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DWORD s = cache[0].serial;
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int c = 0;
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// Compare candidate with serial and update to smaller one
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for (int i = 0; i < CacheMax; i++) {
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ASSERT(cache[i].disktrk);
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// Compare and update the existing serial
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if (cache[i].serial < s) {
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s = cache[i].serial;
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c = i;
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}
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}
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// Save this track
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if (!cache[c].disktrk->Save(sec_path)) {
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return NULL;
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}
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// Delete this track
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DiskTrack *disktrk = cache[c].disktrk;
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cache[c].disktrk = NULL;
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if (Load(c, track, disktrk)) {
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// Successful loading
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cache[c].serial = serial;
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return cache[c].disktrk;
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}
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// Load failed
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return NULL;
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}
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//---------------------------------------------------------------------------
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//
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// Load cache
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//
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//---------------------------------------------------------------------------
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bool DiskCache::Load(int index, int track, DiskTrack *disktrk)
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{
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ASSERT((index >= 0) && (index < CacheMax));
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ASSERT(track >= 0);
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ASSERT(!cache[index].disktrk);
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// Get the number of sectors on this track
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int sectors = sec_blocks - (track << 8);
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ASSERT(sectors > 0);
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if (sectors > 0x100) {
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sectors = 0x100;
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}
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// Create a disk track
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if (disktrk == NULL) {
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disktrk = new DiskTrack();
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}
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// Initialize disk track
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disktrk->Init(track, sec_size, sectors, cd_raw, imgoffset);
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// Try loading
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if (!disktrk->Load(sec_path)) {
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// Failure
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delete disktrk;
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return false;
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}
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// Allocation successful, work set
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cache[index].disktrk = disktrk;
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return true;
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}
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void DiskCache::UpdateSerialNumber()
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{
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// Update and do nothing except 0
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serial++;
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if (serial != 0) {
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return;
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}
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// Clear serial of all caches (loop in 32bit)
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for (int i = 0; i < CacheMax; i++) {
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cache[i].serial = 0;
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}
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}
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