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ciderpress/diskimg/MacPart.cpp

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/*
* CiderPress
* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
* See the file LICENSE for distribution terms.
*/
/*
* The "MacPart" DiskFS is a container class for multiple ProDOS and HFS
* volumes. It represents a partitioned disk device, such as a hard
* drive or CD-ROM.
*/
#include "StdAfx.h"
#include "DiskImgPriv.h"
const int kBlkSize = 512;
const int kDDRBlock = 0; // Driver Descriptor Record block
const int kPartMapStart = 1; // start of partition map
/*
* Format of DDR (block 0).
*/
typedef struct DiskFSMacPart::DriverDescriptorRecord {
uint16_t sbSig; // {device signature}
uint16_t sbBlkSize; // {block size of the device}
uint32_t sbBlkCount; // {number of blocks on the device}
uint16_t sbDevType; // {reserved}
uint16_t sbDevId; // {reserved}
uint32_t sbData; // {reserved}
uint16_t sbDrvrCount; // {number of driver descriptor entries}
uint16_t hiddenPad; // implicit in specification
uint32_t ddBlock; // {first driver's starting block}
uint16_t ddSize; // {size of the driver, in 512-byte blocks}
uint16_t ddType; // {operating system type (MacOS = 1)}
uint16_t ddPad[242]; // {additional drivers, if any}
} DriverDescriptorRecord;
/*
* Format of partition map blocks. The partition map is an array of these.
*/
typedef struct DiskFSMacPart::PartitionMap {
uint16_t pmSig; // {partition signature}
uint16_t pmSigPad; // {reserved}
uint32_t pmMapBlkCnt; // {number of blocks in partition map}
uint32_t pmPyPartStart; // {first physical block of partition}
uint32_t pmPartBlkCnt; // {number of blocks in partition}
uint8_t pmPartName[32]; // {partition name}
uint8_t pmParType[32]; // {partition type}
uint32_t pmLgDataStart; // {first logical block of data area}
uint32_t pmDataCnt; // {number of blocks in data area}
uint32_t pmPartStatus; // {partition status information}
uint32_t pmLgBootStart; // {first logical block of boot code}
uint32_t pmBootSize; // {size of boot code, in bytes}
uint32_t pmBootAddr; // {boot code load address}
uint32_t pmBootAddr2; // {reserved}
uint32_t pmBootEntry; // {boot code entry point}
uint32_t pmBootEntry2; // {reserved}
uint32_t pmBootCksum; // {boot code checksum}
uint8_t pmProcessor[16]; // {processor type}
uint16_t pmPad[188]; // {reserved}
} PartitionMap;
/*
* Figure out if this is a Macintosh-style partition.
*
* The "imageOrder" parameter has no use here, because (in the current
* version) embedded parent volumes are implicitly ProDOS-ordered.
*
* It would be difficult to guess the block order based on the partition
* structure, because the partition map entries can appear in any order.
*/
/*static*/ DIError DiskFSMacPart::TestImage(DiskImg* pImg,
DiskImg::SectorOrder imageOrder)
{
DIError dierr = kDIErrNone;
uint8_t blkBuf[kBlkSize];
DriverDescriptorRecord ddr;
long pmMapBlkCnt;
assert(sizeof(PartitionMap) == kBlkSize);
assert(sizeof(DriverDescriptorRecord) == kBlkSize);
/* check the DDR block */
dierr = pImg->ReadBlockSwapped(kDDRBlock, blkBuf, imageOrder,
DiskImg::kSectorOrderProDOS);
if (dierr != kDIErrNone)
goto bail;
UnpackDDR(blkBuf, &ddr);
if (ddr.sbSig != kDDRSignature) {
dierr = kDIErrFilesystemNotFound;
goto bail;
}
if (ddr.sbBlkSize != kBlkSize || ddr.sbBlkCount == 0) {
if (ddr.sbBlkSize == 0 && ddr.sbBlkCount == 0) {
/*
* This is invalid, but it's the way floptical images formatted
* by the C.V.Tech format utilities look.
*/
LOGI(" MacPart NOTE: found zeroed-out DDR, continuing anyway");
} else if (ddr.sbBlkSize == kBlkSize && ddr.sbBlkCount == 0) {
/*
* This showed up on a disc, so handle it too.
*/
LOGI(" MacPart NOTE: found partially-zeroed-out DDR, continuing");
} else {
LOGI(" MacPart found 'ER' signature but blkSize=%d blkCount=%d",
ddr.sbBlkSize, ddr.sbBlkCount);
dierr = kDIErrFilesystemNotFound;
goto bail;
}
}
DumpDDR(&ddr);
/* make sure block 1 is a partition */
dierr = pImg->ReadBlockSwapped(kPartMapStart, blkBuf, imageOrder,
DiskImg::kSectorOrderProDOS);
if (dierr != kDIErrNone)
goto bail;
if (GetShortBE(&blkBuf[0x00]) != kPartitionSignature) {
LOGI(" MacPart partition signature not found in first part block");
dierr = kDIErrFilesystemNotFound;
goto bail;
}
pmMapBlkCnt = GetLongBE(&blkBuf[0x04]);
if (pmMapBlkCnt <= 0 || pmMapBlkCnt > 256) {
LOGI(" MacPart unreasonable pmMapBlkCnt value %ld",
pmMapBlkCnt);
dierr = kDIErrFilesystemNotFound;
goto bail;
}
/* could test the rest -- might fix "imageOrder", might not -- but
the format is pretty unambiguous, and we don't care about the order */
// success!
LOGI(" MacPart partition map block count = %ld", pmMapBlkCnt);
bail:
return dierr;
}
/*
* Unpack a DDR disk block into a DDR data structure.
*/
/*static*/ void DiskFSMacPart::UnpackDDR(const uint8_t* buf,
DriverDescriptorRecord* pDDR)
{
pDDR->sbSig = GetShortBE(&buf[0x00]);
pDDR->sbBlkSize = GetShortBE(&buf[0x02]);
pDDR->sbBlkCount = GetLongBE(&buf[0x04]);
pDDR->sbDevType = GetShortBE(&buf[0x08]);
pDDR->sbDevId = GetShortBE(&buf[0x0a]);
pDDR->sbData = GetLongBE(&buf[0x0c]);
pDDR->sbDrvrCount = GetShortBE(&buf[0x10]);
pDDR->hiddenPad = GetShortBE(&buf[0x12]);
pDDR->ddBlock = GetLongBE(&buf[0x14]);
pDDR->ddSize = GetShortBE(&buf[0x18]);
pDDR->ddType = GetShortBE(&buf[0x1a]);
int i;
for (i = 0; i < (int) NELEM(pDDR->ddPad); i++) {
pDDR->ddPad[i] = GetShortBE(&buf[0x1c] + i * sizeof(pDDR->ddPad[0]));
}
assert(0x1c + i * sizeof(pDDR->ddPad[0]) == (unsigned int) kBlkSize);
}
/*
* Debug: dump the contents of the DDR.
*/
/*static*/ void DiskFSMacPart::DumpDDR(const DriverDescriptorRecord* pDDR)
{
LOGI(" MacPart driver descriptor record");
LOGI(" sbSig=0x%04x sbBlkSize=%d sbBlkCount=%d",
pDDR->sbSig, pDDR->sbBlkSize, pDDR->sbBlkCount);
LOGI(" sbDevType=%d sbDevId=%d sbData=%d sbDrvrCount=%d",
pDDR->sbDevType, pDDR->sbDevId, pDDR->sbData, pDDR->sbDrvrCount);
LOGI(" (pad=%d) ddBlock=%d ddSize=%d ddType=%d",
pDDR->hiddenPad, pDDR->ddBlock, pDDR->ddSize, pDDR->ddType);
}
/*
* Unpack a partition map disk block into a partition map data structure.
*/
/*static*/ void DiskFSMacPart::UnpackPartitionMap(const uint8_t* buf,
PartitionMap* pMap)
{
pMap->pmSig = GetShortBE(&buf[0x00]);
pMap->pmSigPad = GetShortBE(&buf[0x02]);
pMap->pmMapBlkCnt = GetLongBE(&buf[0x04]);
pMap->pmPyPartStart = GetLongBE(&buf[0x08]);
pMap->pmPartBlkCnt = GetLongBE(&buf[0x0c]);
memcpy(pMap->pmPartName, &buf[0x10], sizeof(pMap->pmPartName));
pMap->pmPartName[sizeof(pMap->pmPartName)-1] = '\0';
memcpy(pMap->pmParType, &buf[0x30], sizeof(pMap->pmParType));
pMap->pmParType[sizeof(pMap->pmParType)-1] = '\0';
pMap->pmLgDataStart = GetLongBE(&buf[0x50]);
pMap->pmDataCnt = GetLongBE(&buf[0x54]);
pMap->pmPartStatus = GetLongBE(&buf[0x58]);
pMap->pmLgBootStart = GetLongBE(&buf[0x5c]);
pMap->pmBootSize = GetLongBE(&buf[0x60]);
pMap->pmBootAddr = GetLongBE(&buf[0x64]);
pMap->pmBootAddr2 = GetLongBE(&buf[0x68]);
pMap->pmBootEntry = GetLongBE(&buf[0x6c]);
pMap->pmBootEntry2 = GetLongBE(&buf[0x70]);
pMap->pmBootCksum = GetLongBE(&buf[0x74]);
memcpy((char*) pMap->pmProcessor, &buf[0x78], sizeof(pMap->pmProcessor));
pMap->pmProcessor[sizeof(pMap->pmProcessor)-1] = '\0';
int i;
for (i = 0; i < (int) NELEM(pMap->pmPad); i++) {
pMap->pmPad[i] = GetShortBE(&buf[0x88] + i * sizeof(pMap->pmPad[0]));
}
assert(0x88 + i * sizeof(pMap->pmPad[0]) == (unsigned int) kBlkSize);
}
/*
* Debug: dump the contents of the partition map.
*/
/*static*/ void DiskFSMacPart::DumpPartitionMap(long block, const PartitionMap* pMap)
{
LOGI(" MacPart partition map: block=%ld", block);
LOGI(" pmSig=0x%04x (pad=0x%04x) pmMapBlkCnt=%d",
pMap->pmSig, pMap->pmSigPad, pMap->pmMapBlkCnt);
LOGI(" pmPartName='%s' pmParType='%s'",
pMap->pmPartName, pMap->pmParType);
LOGI(" pmPyPartStart=%d pmPartBlkCnt=%d",
pMap->pmPyPartStart, pMap->pmPartBlkCnt);
LOGI(" pmLgDataStart=%d pmDataCnt=%d",
pMap->pmLgDataStart, pMap->pmDataCnt);
LOGI(" pmPartStatus=%d",
pMap->pmPartStatus);
LOGI(" pmLgBootStart=%d pmBootSize=%d",
pMap->pmLgBootStart, pMap->pmBootSize);
LOGI(" pmBootAddr=%d pmBootAddr2=%d pmBootEntry=%d pmBootEntry2=%d",
pMap->pmBootAddr, pMap->pmBootAddr2,
pMap->pmBootEntry, pMap->pmBootEntry2);
LOGI(" pmBootCksum=%d pmProcessor='%s'",
pMap->pmBootCksum, pMap->pmProcessor);
}
/*
* Open up a sub-volume.
*/
DIError DiskFSMacPart::OpenSubVolume(const PartitionMap* pMap)
{
DIError dierr = kDIErrNone;
DiskFS* pNewFS = NULL;
DiskImg* pNewImg = NULL;
long startBlock, numBlocks;
bool tweaked = false;
assert(pMap != NULL);
startBlock = pMap->pmPyPartStart;
numBlocks = pMap->pmPartBlkCnt;
LOGI("Adding '%s' (%s) %ld +%ld",
pMap->pmPartName, pMap->pmParType, startBlock, numBlocks);
if (startBlock > fpImg->GetNumBlocks()) {
LOGI("MacPart start block out of range (%ld vs %ld)",
startBlock, fpImg->GetNumBlocks());
return kDIErrBadPartition;
}
if (startBlock + numBlocks > fpImg->GetNumBlocks()) {
LOGI("MacPart partition too large (%ld vs %ld avail)",
numBlocks, fpImg->GetNumBlocks() - startBlock);
fpImg->AddNote(DiskImg::kNoteInfo,
"Reduced partition '%s' (%s) from %ld blocks to %ld.\n",
pMap->pmPartName, pMap->pmParType, numBlocks,
fpImg->GetNumBlocks() - startBlock);
numBlocks = fpImg->GetNumBlocks() - startBlock;
tweaked = true;
}
pNewImg = new DiskImg;
if (pNewImg == NULL) {
dierr = kDIErrMalloc;
goto bail;
}
/*
* If "tweaked" is true, we want to make the volume read-only, so that the
* volume copier doesn't stomp on it (on the off chance we've got it
* wrong). However, that won't stop the volume copier from stomping on
* the entire thing, so we really need to change *all* members of the
* diskimg tree to be read-only. This seems counter-productive though.
*
* So far the only actual occurrence of tweakedness was from the first
* Apple "develop" CD-ROM, which had a bad Apple_Extra partition on the
* end.
*/
(void) tweaked;
dierr = pNewImg->OpenImage(fpImg, startBlock, numBlocks);
if (dierr != kDIErrNone) {
LOGI(" MacPartSub: OpenImage(%ld,%ld) failed (err=%d)",
startBlock, numBlocks, dierr);
goto bail;
}
//LOGI(" +++ CFFASub: new image has ro=%d (parent=%d)",
// pNewImg->GetReadOnly(), pImg->GetReadOnly());
/* the partition is typed; currently no way to give hints to analyzer */
dierr = pNewImg->AnalyzeImage();
if (dierr != kDIErrNone) {
LOGI(" MacPartSub: analysis failed (err=%d)", dierr);
goto bail;
}
/* we allow unrecognized partitions */
if (pNewImg->GetFSFormat() == DiskImg::kFormatUnknown ||
pNewImg->GetSectorOrder() == DiskImg::kSectorOrderUnknown)
{
LOGI(" MacPartSub (%ld,%ld): unable to identify filesystem",
startBlock, numBlocks);
DiskFSUnknown* pUnknownFS = new DiskFSUnknown;
if (pUnknownFS == NULL) {
dierr = kDIErrInternal;
goto bail;
}
pUnknownFS->SetVolumeInfo((const char*)pMap->pmParType);
pNewFS = pUnknownFS;
pNewImg->AddNote(DiskImg::kNoteInfo, "Partition name='%s' type='%s'.",
pMap->pmPartName, pMap->pmParType);
} else {
/* open a DiskFS for the sub-image */
LOGI(" MacPartSub (%ld,%ld) analyze succeeded!", startBlock, numBlocks);
pNewFS = pNewImg->OpenAppropriateDiskFS(true);
if (pNewFS == NULL) {
LOGI(" MacPartSub: OpenAppropriateDiskFS failed");
dierr = kDIErrUnsupportedFSFmt;
goto bail;
}
}
/* we encapsulate arbitrary stuff, so encourage child to scan */
pNewFS->SetScanForSubVolumes(kScanSubEnabled);
/*
* Load the files from the sub-image. When doing our initial tests,
* or when loading data for the volume copier, we don't want to dig
* into our sub-volumes, just figure out what they are and where.
*
* If "initialize" fails, the sub-volume won't get added to the list.
* It's important that a failure at this stage doesn't cause the whole
* thing to fall over.
*/
InitMode initMode;
if (GetScanForSubVolumes() == kScanSubContainerOnly)
initMode = kInitHeaderOnly;
else
initMode = kInitFull;
dierr = pNewFS->Initialize(pNewImg, initMode);
if (dierr != kDIErrNone) {
LOGI(" MacPartSub: error %d reading list of files from disk", dierr);
goto bail;
}
/* add it to the list */
AddSubVolumeToList(pNewImg, pNewFS);
pNewImg = NULL;
pNewFS = NULL;
bail:
delete pNewFS;
delete pNewImg;
return dierr;
}
/*
* Check to see if this is a MacPart volume.
*/
/*static*/ DIError DiskFSMacPart::TestFS(DiskImg* pImg, DiskImg::SectorOrder* pOrder,
DiskImg::FSFormat* pFormat, FSLeniency leniency)
{
if (pImg->GetNumBlocks() < kMinInterestingBlocks)
return kDIErrFilesystemNotFound;
if (pImg->GetIsEmbedded()) // don't look for partitions inside
return kDIErrFilesystemNotFound;
/* assume ProDOS -- shouldn't matter, since it's embedded */
if (TestImage(pImg, DiskImg::kSectorOrderProDOS) == kDIErrNone) {
*pFormat = DiskImg::kFormatMacPart;
*pOrder = DiskImg::kSectorOrderProDOS;
return kDIErrNone;
}
LOGI(" FS didn't find valid MacPart");
return kDIErrFilesystemNotFound;
}
/*
* Prep the MacPart "container" for use.
*/
DIError DiskFSMacPart::Initialize(void)
{
DIError dierr = kDIErrNone;
LOGI("MacPart initializing (scanForSub=%d)", fScanForSubVolumes);
/* seems pointless *not* to, but we just do what we're told */
if (fScanForSubVolumes != kScanSubDisabled) {
dierr = FindSubVolumes();
if (dierr != kDIErrNone)
return dierr;
}
/* blank out the volume usage map */
SetVolumeUsageMap();
return dierr;
}
/*
* Find the various sub-volumes and open them.
*
* Because the partitions are explicitly typed, we don't need to probe
* their contents. But we do anyway.
*/
DIError DiskFSMacPart::FindSubVolumes(void)
{
DIError dierr = kDIErrNone;
uint8_t buf[kBlkSize];
PartitionMap map;
int i, numMapBlocks;
dierr = fpImg->ReadBlock(kPartMapStart, buf);
if (dierr != kDIErrNone)
goto bail;
UnpackPartitionMap(buf, &map);
numMapBlocks = map.pmMapBlkCnt;
for (i = 0; i < numMapBlocks; i++) {
if (i != 0) {
dierr = fpImg->ReadBlock(kPartMapStart+i, buf);
if (dierr != kDIErrNone)
goto bail;
UnpackPartitionMap(buf, &map);
}
DumpPartitionMap(kPartMapStart+i, &map);
dierr = OpenSubVolume(&map);
if (dierr != kDIErrNone) {
if (dierr == kDIErrCancelled)
goto bail;
DiskFS* pNewFS = NULL;
DiskImg* pNewImg = NULL;
LOGI(" MacPart failed opening sub-volume %d", i);
dierr = CreatePlaceholder(map.pmPyPartStart, map.pmPartBlkCnt,
(const char*)map.pmPartName, (const char*)map.pmParType,
&pNewImg, &pNewFS);
if (dierr == kDIErrNone) {
AddSubVolumeToList(pNewImg, pNewFS);
} else {
LOGI(" MacPart unable to create placeholder (err=%d)",
dierr);
break; // something's wrong -- bail out with error
}
}
}
bail:
return dierr;
}
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