592 lines
20 KiB
C++
592 lines
20 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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* The "CFFA" DiskFS is a container class for multiple ProDOS and HFS volumes.
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*
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* The CFFA card doesn't have any RAM, so the author used a fixed partitioning
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* scheme. You get 4 or 8 volumes -- depending on which firmware you jumper
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* in -- at 32MB each. CF cards usually hold less than you would expect, so
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* a 64MB card would have one 32MB volume and one less-than-32MB volume.
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*
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* With Dave's GS/OS driver, you get an extra drive or two at the end, at up
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* to 1GB each. The driver only works in 4-volume mode.
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*
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* There is no magic CFFA block at the front, so it looks like a plain
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* ProDOS or HFS volume. If the size is less than 32MB -- meaning there's
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* only one volume -- we don't need to take an interest in the file,
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* because the regular filesystem goodies will handle it just fine. If it's
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* more than 32MB, we need to create a structure in which multiple volumes
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* reside.
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*
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* The trick is finding all the volumes. The first four are easy. The
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* fifth one is either another 32MB volume (if you're in 8-volume mode)
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* or a volume whose size is somewhere between the amount of space left
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* and 1GB. Not an issue until we get to CF cards > 128MB. We have to
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* rely on the CFFA card making volumes as large as it can.
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*
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* I think it's reasonable to require that the first volume be either ProDOS
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* or HFS. That way we don't go digging through large non-CFFA files when
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* auto-probing.
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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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* Figure out if this is a CFFA volume, and if so, whether it was formatted
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* in 4-partition or 8-partition mode.
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*
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* The "imageOrder" parameter has no use here, because (in the current
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* version) embedded parent volumes are implicitly ProDOS-ordered.
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*
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* "*pFormatFound" should be either a CFFA format or "unknown" on entry.
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* If it's not "unknown", we will look for the specified format first.
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* Otherwise, we look for 4-partition then 8-partition. The first one
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* we find successfully is returned.
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*
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* Ideally we'd have some way to express ambiguity here, so that we could
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* force the "disk format verification" dialog to come up. No such
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* mechanism exists, and for now it doesn't seem worthwhile to add one.
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*/
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/*static*/ DIError DiskFSCFFA::TestImage(DiskImg* pImg,
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DiskImg::SectorOrder imageOrder, DiskImg::FSFormat* pFormatFound)
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{
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DIError dierr;
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long totalBlocks = pImg->GetNumBlocks();
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long startBlock, maxBlocks, totalBlocksLeft;
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long fsNumBlocks;
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DiskFS* pNewFS = NULL;
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DiskImg* pNewImg = NULL;
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//bool fiveIs32MB;
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assert(totalBlocks > kEarlyVolExpectedSize);
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// could be "generic" from an earlier override
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if (*pFormatFound != DiskImg::kFormatCFFA4 &&
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*pFormatFound != DiskImg::kFormatCFFA8)
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{
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*pFormatFound = DiskImg::kFormatUnknown;
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}
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LOGI("----- BEGIN CFFA SCAN (fmt=%d) -----", *pFormatFound);
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startBlock = 0;
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totalBlocksLeft = totalBlocks;
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/*
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* Look for a 32MB ProDOS or HFS volume in the first slot. If we
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* don't find this, it's probably not CFFA. It's possible they just
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* didn't format the first one, but that seems unlikely, and it's not
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* unreasonable to insist that they format the first partition.
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*/
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maxBlocks = totalBlocksLeft;
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if (maxBlocks > kEarlyVolExpectedSize)
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maxBlocks = kEarlyVolExpectedSize;
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dierr = OpenSubVolume(pImg, startBlock, maxBlocks, true,
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&pNewImg, &pNewFS);
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if (dierr != kDIErrNone) {
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LOGI(" CFFA failed opening sub-volume #1");
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goto bail;
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}
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fsNumBlocks = pNewFS->GetFSNumBlocks();
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delete pNewFS;
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delete pNewImg;
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if (fsNumBlocks != kEarlyVolExpectedSize &&
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fsNumBlocks != kEarlyVolExpectedSize-1)
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{
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LOGI(" CFFA found fsNumBlocks=%ld in slot #1", fsNumBlocks);
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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LOGI(" CFFA found good volume in slot #1");
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startBlock += maxBlocks;
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totalBlocksLeft -= maxBlocks;
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assert(totalBlocksLeft > 0);
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/*
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* Look for a ProDOS or HFS volume <= 32MB in the second slot. If
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* we don't find something here, and this is a 64MB card, then there's
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* no advantage to using CFFA (in fact, the single-volume handling may
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* be more convenient). If there's at least another 32MB, we continue
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* looking.
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*/
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maxBlocks = totalBlocksLeft;
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if (maxBlocks > kEarlyVolExpectedSize)
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maxBlocks = kEarlyVolExpectedSize;
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dierr = OpenSubVolume(pImg, startBlock, maxBlocks, true,
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&pNewImg, &pNewFS);
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if (dierr != kDIErrNone) {
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LOGI(" CFFA failed opening sub-volume #2");
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if (maxBlocks < kEarlyVolExpectedSize)
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goto bail;
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// otherwise, assume they just didn't format #2, and keep going
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} else {
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fsNumBlocks = pNewFS->GetFSNumBlocks();
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delete pNewFS;
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delete pNewImg;
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#if 0
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if (fsNumBlocks != kEarlyVolExpectedSize &&
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fsNumBlocks != kEarlyVolExpectedSize-1)
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{
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LOGI(" CFFA found fsNumBlocks=%ld in slot #2", fsNumBlocks);
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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#endif
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LOGI(" CFFA found good volume in slot #2");
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}
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startBlock += maxBlocks;
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totalBlocksLeft -= maxBlocks;
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if (totalBlocksLeft == 0) {
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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/*
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* Skip #3 and #4.
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*/
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LOGI(" CFFA skipping over slot #3");
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maxBlocks = kEarlyVolExpectedSize*2;
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if (maxBlocks > totalBlocksLeft)
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maxBlocks = totalBlocksLeft;
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startBlock += maxBlocks;
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totalBlocksLeft -= maxBlocks;
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if (totalBlocksLeft == 0) {
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// no more partitions to find; we're done
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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LOGI(" CFFA skipping over slot #4");
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/*
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* Partition #5. We know where it starts, but not how large it is.
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* Could be 32MB, could be 1GB, could be anything between.
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*
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* CF cards come in power-of-two sizes -- 128MB, 256MB, etc. -- but
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* we don't want to make assumptions here. It's possible we're
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* looking at an odd-sized image file that some clever person is
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* expecting to access with CiderPress.
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*/
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maxBlocks = totalBlocksLeft;
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if (maxBlocks > kOneGB)
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maxBlocks = kOneGB;
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if (maxBlocks <= kEarlyVolExpectedSize) {
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/*
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* Only enough room for one <= 32MB volume. Not expected for a
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* real CFFA card, unless they come in 160MB sizes.
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*
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* Treat it like 4-partition; it'll look like somebody slapped a
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* 32MB volume into the first 1GB area.
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*/
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LOGI(" CFFA assuming odd-sized slot #5");
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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/*
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* We could be looking at a 32MB ProDOS partition, 32MB HFS partition,
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* or an up to 1GB HFS partition. We have to specify the size in
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* the OpenSubVolume request, which means trying it both ways and
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* finding a match from GetFSNumBlocks(). Complicating matters is
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* truncation (ProDOS max 65535, not 65536) and round-off (not sure
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* how HFS deals with left-over blocks).
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*
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* Start with <= 1GB.
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*/
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dierr = OpenSubVolume(pImg, startBlock, maxBlocks, true,
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&pNewImg, &pNewFS);
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if (dierr != kDIErrNone) {
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if (dierr == kDIErrCancelled)
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goto bail;
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LOGI(" CFFA failed opening large sub-volume #5");
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// if we can't get #5, don't bother looking for #6
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// (we could try anyway, but it's easier to just skip it)
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dierr = kDIErrNone;
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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fsNumBlocks = pNewFS->GetFSNumBlocks();
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delete pNewFS;
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delete pNewImg;
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if (fsNumBlocks < 2 || fsNumBlocks > maxBlocks) {
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LOGI(" CFFA WARNING: FSNumBlocks #5 reported blocks=%ld",
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fsNumBlocks);
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}
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if (fsNumBlocks == kEarlyVolExpectedSize-1 ||
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fsNumBlocks == kEarlyVolExpectedSize)
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{
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LOGI(" CFFA #5 is a 32MB volume");
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// tells us nothing -- could still be 4 or 8, so we keep going
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maxBlocks = kEarlyVolExpectedSize;
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} else if (fsNumBlocks > kEarlyVolExpectedSize) {
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// must be a GS/OS 1GB area
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LOGI(" CFFA #5 is larger than 32MB");
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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} else {
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LOGI(" CFFA #5 was unexpectedly small (%ld blocks)", fsNumBlocks);
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// just stop now
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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startBlock += maxBlocks;
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totalBlocksLeft -= maxBlocks;
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if (!totalBlocksLeft) {
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LOGI(" CFFA got 5 volumes");
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*pFormatFound = DiskImg::kFormatCFFA4;
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goto bail;
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}
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/*
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* Various possibilities for slots 5 and up:
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* A. Card in 4-partition mode. 5th partition isn't formatted. Don't
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* bother looking for 6th. [already handled]
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* B. Card in 4-partition mode. 5th partition is >32MB HFS. 6th
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* partition will be at +1GB. [already handled]
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* C. Card in 4-partition mode. 5th partition is 32MB ProDOS. 6th
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* partition will be at +1GB.
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* D. Card in 8-partition mode. 5th partition is 32MB HFS. 6th
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* partition will be at +32MB.
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* E. Card in 8-partition mode. 5th partition is 32MB ProDOS. 6th
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* partition will be at +32MB.
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*
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* I'm ignoring D on the off chance somebody could create a 32MB HFS
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* partition in the 1GB space. D and E are handled alike.
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*
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* The difference between C and D/E can *usually* be determined by
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* opening up a 6th partition in the two expected locations.
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*/
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LOGI(" CFFA probing 6th slot for 4-vs-8");
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/*
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* Look in two different places. If we find something at the
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* +32MB mark, assume it's in "8 mode". If we find something at
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* the +1GB mark, assume it's in "4 + GS/OS mode". If both exist
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* we have a problem.
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*/
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bool foundSmall, foundGig;
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foundSmall = false;
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maxBlocks = totalBlocksLeft;
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if (maxBlocks > kEarlyVolExpectedSize)
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maxBlocks = kEarlyVolExpectedSize;
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dierr = OpenSubVolume(pImg, startBlock + kEarlyVolExpectedSize,
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maxBlocks, true, &pNewImg, &pNewFS);
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if (dierr != kDIErrNone) {
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if (dierr == kDIErrCancelled)
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goto bail;
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LOGI(" CFFA no vol #6 found at +32MB");
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} else {
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foundSmall = true;
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delete pNewFS;
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delete pNewImg;
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}
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foundGig = false;
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// no need to look if we don't have at least 1GB left!
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if (totalBlocksLeft >= kOneGB) {
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maxBlocks = totalBlocksLeft;
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if (maxBlocks > kOneGB)
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maxBlocks = kOneGB;
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dierr = OpenSubVolume(pImg, startBlock + kOneGB,
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maxBlocks, true, &pNewImg, &pNewFS);
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if (dierr != kDIErrNone) {
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if (dierr == kDIErrCancelled)
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goto bail;
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LOGI(" CFFA no vol #6 found at +1GB");
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} else {
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foundGig = true;
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delete pNewFS;
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delete pNewImg;
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}
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}
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dierr = kDIErrNone;
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if (!foundSmall && !foundGig) {
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LOGI(" CFFA no valid filesystem found in 6th position");
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*pFormatFound = DiskImg::kFormatCFFA4;
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// don't bother looking for 7 and 8
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} else if (foundSmall && foundGig) {
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LOGI(" CFFA WARNING: found valid volumes at +32MB *and* +1GB");
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// default to 4-partition mode
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if (*pFormatFound == DiskImg::kFormatUnknown)
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*pFormatFound = DiskImg::kFormatCFFA4;
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} else if (foundGig) {
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LOGI(" CFFA found 6th volume at +1GB, assuming 4-mode w/GSOS");
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if (fsNumBlocks < 2 || fsNumBlocks > kOneGB) {
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LOGI(" CFFA WARNING: FSNumBlocks #6 reported as %ld",
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fsNumBlocks);
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}
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*pFormatFound = DiskImg::kFormatCFFA4;
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} else if (foundSmall) {
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LOGI(" CFFA found 6th volume at +32MB, assuming 8-mode");
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if (fsNumBlocks < 2 || fsNumBlocks > kEarlyVolExpectedSize) {
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LOGI(" CFFA WARNING: FSNumBlocks #6 reported as %ld",
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fsNumBlocks);
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}
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*pFormatFound = DiskImg::kFormatCFFA8;
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} else {
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assert(false); // how'd we get here??
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}
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// done!
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bail:
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LOGI("----- END CFFA SCAN (err=%d format=%d) -----",
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dierr, *pFormatFound);
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if (dierr == kDIErrNone) {
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assert(*pFormatFound != DiskImg::kFormatUnknown);
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} else {
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*pFormatFound = DiskImg::kFormatUnknown;
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}
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return dierr;
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}
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/*
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* Open up a sub-volume.
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*
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* If "scanOnly" is set, the full DiskFS initialization isn't performed.
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* We just do enough to get the volume size info.
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*/
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/*static*/ DIError DiskFSCFFA::OpenSubVolume(DiskImg* pImg, long startBlock,
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long numBlocks, bool scanOnly, DiskImg** ppNewImg, DiskFS** ppNewFS)
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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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dierr = pNewImg->OpenImage(pImg, startBlock, numBlocks);
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if (dierr != kDIErrNone) {
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LOGI(" CFFASub: OpenImage(%ld,%ld) failed (err=%d)",
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startBlock, numBlocks, dierr);
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goto bail;
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}
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//LOGI(" +++ CFFASub: new image has ro=%d (parent=%d)",
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// pNewImg->GetReadOnly(), pImg->GetReadOnly());
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dierr = pNewImg->AnalyzeImage();
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if (dierr != kDIErrNone) {
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LOGI(" CFFASub: 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(" CFFASub: unable to identify filesystem at %ld",
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startBlock);
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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(" CFFASub (%ld,%ld) analyze succeeded!", startBlock, numBlocks);
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pNewFS = pNewImg->OpenAppropriateDiskFS();
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if (pNewFS == NULL) {
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LOGI(" CFFASub: OpenAppropriateDiskFS failed");
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dierr = kDIErrUnsupportedFSFmt;
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goto bail;
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}
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/* we encapsulate arbitrary stuff, so encourage child to scan */
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pNewFS->SetScanForSubVolumes(kScanSubEnabled);
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/*
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* Load the files from the sub-image. When doing our initial tests,
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* or when loading data for the volume copier, we don't want to dig
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* into our sub-volumes, just figure out what they are and where.
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*/
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InitMode initMode;
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if (scanOnly)
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initMode = kInitHeaderOnly;
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else
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initMode = kInitFull;
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dierr = pNewFS->Initialize(pNewImg, initMode);
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if (dierr != kDIErrNone) {
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LOGI(" CFFASub: error %d reading list of files from disk", dierr);
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goto bail;
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}
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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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} else {
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*ppNewImg = pNewImg;
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*ppNewFS = pNewFS;
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}
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return dierr;
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}
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/*
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* Check to see if this is a CFFA volume.
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*/
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/*static*/ DIError DiskFSCFFA::TestFS(DiskImg* pImg, DiskImg::SectorOrder* pOrder,
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DiskImg::FSFormat* pFormat, FSLeniency leniency)
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{
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if (pImg->GetNumBlocks() < kMinInterestingBlocks)
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return kDIErrFilesystemNotFound;
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if (pImg->GetIsEmbedded()) // don't look for CFFA inside CFFA!
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return kDIErrFilesystemNotFound;
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/* assume ProDOS -- shouldn't matter, since it's embedded */
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if (TestImage(pImg, DiskImg::kSectorOrderProDOS, pFormat) == kDIErrNone) {
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assert(*pFormat == DiskImg::kFormatCFFA4 ||
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*pFormat == DiskImg::kFormatCFFA8);
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*pOrder = DiskImg::kSectorOrderProDOS;
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return kDIErrNone;
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}
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// make sure we didn't tamper with it
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assert(*pFormat == DiskImg::kFormatUnknown);
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LOGI(" FS didn't find valid CFFA");
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return kDIErrFilesystemNotFound;
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}
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/*
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* Prep the CFFA "container" for use.
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*/
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DIError DiskFSCFFA::Initialize(void)
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{
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DIError dierr = kDIErrNone;
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LOGI("CFFA initializing (scanForSub=%d)", fScanForSubVolumes);
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/* seems pointless *not* to, but we just do what we're told */
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if (fScanForSubVolumes != kScanSubDisabled) {
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dierr = FindSubVolumes();
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if (dierr != kDIErrNone)
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return dierr;
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}
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/* blank out the volume usage map */
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SetVolumeUsageMap();
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return dierr;
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}
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/*
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* Find the various sub-volumes and open them.
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*
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* We don't handle the volume specially unless it's at least 32MB, which
|
|
* means there are at least 2 partitions.
|
|
*/
|
|
DIError DiskFSCFFA::FindSubVolumes(void)
|
|
{
|
|
DIError dierr;
|
|
long startBlock, blocksLeft;
|
|
|
|
startBlock = 0;
|
|
blocksLeft = fpImg->GetNumBlocks();
|
|
|
|
if (fpImg->GetFSFormat() == DiskImg::kFormatCFFA4) {
|
|
LOGI(" CFFA opening 4+2 volumes");
|
|
dierr = AddVolumeSeries(0, 4, kEarlyVolExpectedSize, /*ref*/startBlock,
|
|
/*ref*/blocksLeft);
|
|
if (dierr != kDIErrNone)
|
|
goto bail;
|
|
|
|
LOGI(" CFFA after first 4, startBlock=%ld blocksLeft=%ld",
|
|
startBlock, blocksLeft);
|
|
if (blocksLeft > 0) {
|
|
dierr = AddVolumeSeries(4, 2, kOneGB, /*ref*/startBlock,
|
|
/*ref*/blocksLeft);
|
|
if (dierr != kDIErrNone)
|
|
goto bail;
|
|
}
|
|
} else if (fpImg->GetFSFormat() == DiskImg::kFormatCFFA8) {
|
|
LOGI(" CFFA opening 8 volumes");
|
|
dierr = AddVolumeSeries(0, 8, kEarlyVolExpectedSize, /*ref*/startBlock,
|
|
/*ref*/blocksLeft);
|
|
if (dierr != kDIErrNone)
|
|
goto bail;
|
|
} else {
|
|
assert(false);
|
|
return kDIErrInternal;
|
|
}
|
|
|
|
if (blocksLeft != 0) {
|
|
LOGI(" CFFA ignoring leftover %ld blocks", blocksLeft);
|
|
}
|
|
|
|
bail:
|
|
return dierr;
|
|
}
|
|
|
|
/*
|
|
* Add a series of equal-sized volumes.
|
|
*
|
|
* Updates "startBlock" and "totalBlocksLeft".
|
|
*/
|
|
DIError DiskFSCFFA::AddVolumeSeries(int start, int count, long blocksPerVolume,
|
|
long& startBlock, long& totalBlocksLeft)
|
|
{
|
|
DIError dierr = kDIErrNone;
|
|
DiskFS* pNewFS = NULL;
|
|
DiskImg* pNewImg = NULL;
|
|
long maxBlocks, fsNumBlocks;
|
|
bool scanOnly = false;
|
|
|
|
/* used by volume copier, to avoid deep scan */
|
|
if (GetScanForSubVolumes() == kScanSubContainerOnly)
|
|
scanOnly = true;
|
|
|
|
for (int i = start; i < start+count; i++) {
|
|
maxBlocks = blocksPerVolume;
|
|
if (maxBlocks > totalBlocksLeft)
|
|
maxBlocks = totalBlocksLeft;
|
|
|
|
dierr = OpenSubVolume(fpImg, startBlock, maxBlocks, scanOnly,
|
|
&pNewImg, &pNewFS);
|
|
if (dierr != kDIErrNone) {
|
|
if (dierr == kDIErrCancelled)
|
|
goto bail;
|
|
LOGI(" CFFA failed opening sub-volume %d (not formatted?)", i);
|
|
/* create a fake one to represent the partition */
|
|
dierr = CreatePlaceholder(startBlock, maxBlocks, NULL, NULL,
|
|
&pNewImg, &pNewFS);
|
|
if (dierr == kDIErrNone) {
|
|
AddSubVolumeToList(pNewImg, pNewFS);
|
|
} else {
|
|
LOGI(" CFFA unable to create placeholder (%ld, %ld) (err=%d)",
|
|
startBlock, maxBlocks, dierr);
|
|
goto bail;
|
|
}
|
|
} else {
|
|
fsNumBlocks = pNewFS->GetFSNumBlocks();
|
|
if (fsNumBlocks < 2 || fsNumBlocks > blocksPerVolume) {
|
|
LOGI(" CFFA WARNING: FSNumBlocks #%d reported as %ld",
|
|
i, fsNumBlocks);
|
|
}
|
|
AddSubVolumeToList(pNewImg, pNewFS);
|
|
}
|
|
|
|
startBlock += maxBlocks;
|
|
totalBlocksLeft -= maxBlocks;
|
|
if (!totalBlocksLeft)
|
|
break; // all done
|
|
}
|
|
|
|
bail:
|
|
return dierr;
|
|
}
|