321 lines
9.4 KiB
C++
321 lines
9.4 KiB
C++
/*
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* CiderPress
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* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
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* See the file LICENSE for distribution terms.
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*/
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/*
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* Implementation of DiskFSOzDOS class.
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*
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* It would make life MUCH EASIER to have the DiskImg recognize this as
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* a file format and just rearrange the blocks into linear order for us,
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* but unfortunately that's not going to happen.
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*/
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#include "StdAfx.h"
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#include "DiskImgPriv.h"
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/*
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* ===========================================================================
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* DiskFSOzDOS
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* ===========================================================================
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*/
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const int kExpectedNumBlocks = 1600;
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const int kExpectedTracks = 50; // 50 tracks of 32 sectors == 400K
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const int kExpectedSectors = 32;
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const int kVTOCTrack = 17;
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const int kVTOCSector = 0;
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const int kSctSize = 256;
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const int kCatalogEntrySize = 0x23; // length in bytes of catalog entries
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const int kCatalogEntriesPerSect = 7; // #of entries per catalog sector
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const int kMaxTSPairs = 0x7a; // 122 entries for 256-byte sectors
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const int kTSOffset = 0x0c; // first T/S entry in a T/S list
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const int kMaxTSIterations = 32;
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const int kMaxCatalogIterations = 64;
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/*
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* Read a track/sector, adjusting for 32-sector disks being treated as
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* if they were 16-sector.
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*/
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static DIError ReadTrackSectorAdjusted(DiskImg* pImg, int track, int sector,
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int sectorOffset, uint8_t* buf, DiskImg::SectorOrder imageOrder)
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{
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track *= 4;
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sector = sector * 2 + sectorOffset;
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while (sector >= 16) {
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track++;
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sector -= 16;
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}
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return pImg->ReadTrackSectorSwapped(track, sector, buf, imageOrder,
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DiskImg::kSectorOrderDOS);
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}
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/*
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* Test for presence of 400K OzDOS 3.3 volumes.
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*/
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static DIError TestImageHalf(DiskImg* pImg, int sectorOffset,
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DiskImg::SectorOrder imageOrder)
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{
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DIError dierr = kDIErrNone;
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uint8_t sctBuf[kSctSize];
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int numTracks, numSectors;
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int catTrack, catSect;
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int foundGood = 0;
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int iterations = 0;
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assert(sectorOffset == 0 || sectorOffset == 1);
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dierr = ReadTrackSectorAdjusted(pImg, kVTOCTrack, kVTOCSector,
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sectorOffset, sctBuf, imageOrder);
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if (dierr != kDIErrNone)
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goto bail;
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catTrack = sctBuf[0x01];
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catSect = sctBuf[0x02];
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numTracks = sctBuf[0x34];
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numSectors = sctBuf[0x35];
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if (!(sctBuf[0x27] == kMaxTSPairs) ||
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/*!(sctBuf[0x36] == 0 && sctBuf[0x37] == 1) ||*/ // bytes per sect
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!(numTracks == kExpectedTracks) ||
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!(numSectors == 32) ||
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!(catTrack < numTracks && catSect < numSectors) ||
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0)
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{
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LOGI(" OzDOS header test %d failed", sectorOffset);
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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/*
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* Walk through the catalog track to try to figure out ordering.
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*/
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while (catTrack != 0 && catSect != 0 && iterations < kMaxCatalogIterations)
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{
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dierr = ReadTrackSectorAdjusted(pImg, catTrack, catSect,
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sectorOffset, sctBuf, imageOrder);
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if (dierr != kDIErrNone)
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goto bail_ok; /* allow it if not fully broken */
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if (sctBuf[1] == catTrack && sctBuf[2] == catSect-1)
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foundGood++;
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catTrack = sctBuf[1];
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catSect = sctBuf[2];
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iterations++; // watch for infinite loops
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}
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if (iterations >= kMaxCatalogIterations) {
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dierr = kDIErrDirectoryLoop;
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goto bail;
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}
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bail_ok:
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LOGI(" OzDOS foundGood=%d off=%d swap=%d", foundGood, sectorOffset,
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imageOrder);
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/* foundGood hits 3 even when swap is wrong */
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if (foundGood > 4)
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dierr = kDIErrNone;
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else
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dierr = kDIErrFilesystemNotFound;
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bail:
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return dierr;
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}
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/*
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* Test both of the DOS partitions.
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*/
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static DIError TestImage(DiskImg* pImg, DiskImg::SectorOrder imageOrder)
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{
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DIError dierr;
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LOGI(" OzDOS checking first half (swap=%d)", imageOrder);
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dierr = TestImageHalf(pImg, 0, imageOrder);
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if (dierr != kDIErrNone)
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return dierr;
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LOGI(" OzDOS checking second half (swap=%d)", imageOrder);
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dierr = TestImageHalf(pImg, 1, imageOrder);
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if (dierr != kDIErrNone)
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return dierr;
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return kDIErrNone;
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}
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/*
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* Test to see if the image is a OzDOS volume.
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*/
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/*static*/ DIError DiskFSOzDOS::TestFS(DiskImg* pImg, DiskImg::SectorOrder* pOrder,
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DiskImg::FSFormat* pFormat, FSLeniency leniency)
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{
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/* only on 800K disks (at the least, insist on numTracks being even) */
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if (pImg->GetNumBlocks() != kExpectedNumBlocks)
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return kDIErrFilesystemNotFound;
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/* if a value is specified, try that first -- useful for OverrideFormat */
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if (*pOrder != DiskImg::kSectorOrderUnknown) {
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if (TestImage(pImg, *pOrder) == kDIErrNone) {
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LOGI(" OzDOS accepted FirstTry value");
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return kDIErrNone;
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}
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}
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DiskImg::SectorOrder ordering[DiskImg::kSectorOrderMax];
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DiskImg::GetSectorOrderArray(ordering, *pOrder);
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for (int i = 0; i < DiskImg::kSectorOrderMax; i++) {
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if (ordering[i] == DiskImg::kSectorOrderUnknown)
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continue;
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if (TestImage(pImg, ordering[i]) == kDIErrNone) {
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*pOrder = ordering[i];
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*pFormat = DiskImg::kFormatOzDOS;
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return kDIErrNone;
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}
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}
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LOGI(" OzDOS didn't find valid FS");
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return kDIErrFilesystemNotFound;
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}
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#if 0
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/*
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* Test to see if the image is a 'wide' (32-sector) DOS3.3 volume, i.e.
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* half of a OzDOS volume.
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*/
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/*static*/ DIError DiskFS::TestOzWideDOS33(const DiskImg* pImg,
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DiskImg::SectorOrder* pOrder)
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{
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DIError dierr = kDIErrNone;
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/* only on 400K disks (at the least, insist on numTracks being even) */
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if (pImg->GetNumBlocks() != kExpectedNumBlocks/2)
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return kDIErrFilesystemNotFound;
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/* if a value is specified, try that first -- useful for OverrideFormat */
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if (*pOrder != DiskImg::kSectorOrderUnknown) {
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if (TestImageHalf(pImg, 0, *pOrder) == kDIErrNone) {
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LOGI(" WideDOS accepted FirstTry value");
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return kDIErrNone;
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}
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}
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if (TestImageHalf(pImg, 0, DiskImg::kSectorOrderDOS) == kDIErrNone) {
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*pOrder = DiskImg::kSectorOrderDOS;
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} else if (TestImageHalf(pImg, 0, DiskImg::kSectorOrderProDOS) == kDIErrNone) {
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*pOrder = DiskImg::kSectorOrderProDOS;
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} else if (TestImageHalf(pImg, 0, DiskImg::kSectorOrderPhysical) == kDIErrNone) {
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*pOrder = DiskImg::kSectorOrderPhysical;
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} else {
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LOGI(" FS didn't find valid 'wide' DOS3.3");
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return kDIErrFilesystemNotFound;
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}
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return kDIErrNone;
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}
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#endif
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/*
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* Set up our sub-volumes.
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*/
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DIError DiskFSOzDOS::Initialize(void)
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{
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DIError dierr = kDIErrNone;
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if (fScanForSubVolumes != kScanSubDisabled) {
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dierr = OpenSubVolume(0);
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if (dierr != kDIErrNone)
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return dierr;
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dierr = OpenSubVolume(1);
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if (dierr != kDIErrNone)
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return dierr;
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} else {
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LOGI(" OzDOS not scanning for sub-volumes");
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}
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SetVolumeUsageMap();
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return kDIErrNone;
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}
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/*
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* Open up one of the DOS 3.3 sub-volumes.
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*/
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DIError DiskFSOzDOS::OpenSubVolume(int idx)
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{
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DIError dierr = kDIErrNone;
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DiskFS* pNewFS = NULL;
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DiskImg* pNewImg = NULL;
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pNewImg = new DiskImg;
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if (pNewImg == NULL) {
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dierr = kDIErrMalloc;
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goto bail;
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}
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// open the full 800K; SetPairedSectors cuts it in half
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dierr = pNewImg->OpenImage(fpImg, 0, 0,
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2 * kExpectedTracks * kExpectedSectors);
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if (dierr != kDIErrNone) {
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LOGI(" OzSub: OpenImage(%d,0,%d) failed (err=%d)",
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0, 2 * kExpectedTracks * kExpectedSectors, dierr);
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goto bail;
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}
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assert(idx == 0 || idx == 1);
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pNewImg->SetPairedSectors(true, 1-idx);
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LOGI(" OzSub: testing for recognizable volume in idx=%d", idx);
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dierr = pNewImg->AnalyzeImage();
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if (dierr != kDIErrNone) {
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LOGI(" OzSub: analysis failed (err=%d)", dierr);
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goto bail;
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}
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if (pNewImg->GetFSFormat() == DiskImg::kFormatUnknown ||
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pNewImg->GetSectorOrder() == DiskImg::kSectorOrderUnknown)
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{
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LOGI(" OzSub: unable to identify filesystem");
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dierr = kDIErrUnsupportedFSFmt;
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goto bail;
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}
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/* open a DiskFS for the sub-image */
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LOGI(" UNISub %d succeeded!", idx);
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pNewFS = pNewImg->OpenAppropriateDiskFS();
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if (pNewFS == NULL) {
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LOGI(" OzSub: OpenAppropriateDiskFS failed");
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dierr = kDIErrUnsupportedFSFmt;
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goto bail;
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}
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/* load the files from the sub-image */
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dierr = pNewFS->Initialize(pNewImg, kInitFull);
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if (dierr != kDIErrNone) {
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LOGE(" OzSub: error %d reading list of files from disk", dierr);
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goto bail;
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}
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/* if this really is DOS 3.3, override the "volume name" */
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if (pNewImg->GetFSFormat() == DiskImg::kFormatDOS33) {
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DiskFSDOS33* pDOS = (DiskFSDOS33*) pNewFS; /* eek, a downcast */
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pDOS->SetDiskVolumeNum(idx+1);
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}
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/*
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* Success, add it to the sub-volume list.
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*/
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AddSubVolumeToList(pNewImg, pNewFS);
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bail:
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if (dierr != kDIErrNone) {
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delete pNewFS;
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delete pNewImg;
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}
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return dierr;
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}
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