354 lines
11 KiB
C++
354 lines
11 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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* This is a container for the Parsons Engineering FocusDrive.
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*
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* The format was reverse-engineered by Ranger Harke.
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*/
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#include "StdAfx.h"
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#include "DiskImgPriv.h"
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const int kBlkSize = 512;
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const int kPartMapBlock = 0; // partition map lives here
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const int kMaxPartitions = 30; // max allowed partitions on a drive
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const int kPartNameStart = 1; // partition names start here (2 blocks)
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const int kPartNameLen = 32; // max length of partition name
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static const char* kSignature = "Parsons Engin.";
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const int kSignatureLen = 14;
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/*
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* Format of partition map. It resides in the first 256 bytes of block 0.
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* All values are in little-endian order.
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*
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* We also make space here for the partition names, which live on blocks 1+2.
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*/
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typedef struct DiskFSFocusDrive::PartitionMap {
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uint8_t signature[kSignatureLen];
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uint8_t unknown1;
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uint8_t partCount; // could be ushort, combined w/unknown1
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uint8_t unknown2[16];
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struct Entry {
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uint32_t startBlock;
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uint32_t blockCount;
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uint32_t unknown1;
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uint32_t unknown2;
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uint8_t name[kPartNameLen+1];
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} entry[kMaxPartitions];
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} PartitionMap;
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/*
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* Figure out if this is a FocusDrive partition.
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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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/*static*/ DIError DiskFSFocusDrive::TestImage(DiskImg* pImg,
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DiskImg::SectorOrder imageOrder)
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{
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DIError dierr = kDIErrNone;
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uint8_t blkBuf[kBlkSize];
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int partCount;
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/*
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* See if block 0 is a FocusDrive partition map.
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*/
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dierr = pImg->ReadBlockSwapped(kPartMapBlock, blkBuf, imageOrder,
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DiskImg::kSectorOrderProDOS);
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if (dierr != kDIErrNone)
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goto bail;
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if (memcmp(blkBuf, kSignature, kSignatureLen) != 0) {
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LOGI(" FocusDrive partition signature not found in first part block");
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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partCount = blkBuf[0x0f];
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if (partCount == 0 || partCount > kMaxPartitions) {
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LOGI(" FocusDrive partition count looks bad (%d)", partCount);
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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// success!
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LOGI(" Looks like FocusDrive with %d partitions", partCount);
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bail:
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return dierr;
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}
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/*
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* Unpack a partition map block into a partition map data structure.
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*/
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/*static*/ void DiskFSFocusDrive::UnpackPartitionMap(const uint8_t* buf,
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const uint8_t* nameBuf, PartitionMap* pMap)
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{
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const uint8_t* ptr;
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const uint8_t* namePtr;
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int i;
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memcpy(pMap->signature, &buf[0x00], kSignatureLen);
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pMap->unknown1 = buf[0x0e];
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pMap->partCount = buf[0x0f];
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memcpy(pMap->unknown2, &buf[0x10], 16);
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ptr = &buf[0x20];
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namePtr = &nameBuf[kPartNameLen]; // not sure what first 32 bytes are
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for (i = 0; i < kMaxPartitions; i++) {
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pMap->entry[i].startBlock = GetLongLE(ptr);
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pMap->entry[i].blockCount = GetLongLE(ptr+4);
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pMap->entry[i].unknown1 = GetLongLE(ptr+8);
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pMap->entry[i].unknown2 = GetLongLE(ptr+12);
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memcpy(pMap->entry[i].name, namePtr, kPartNameLen);
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pMap->entry[i].name[kPartNameLen] = '\0';
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ptr += 0x10;
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namePtr += kPartNameLen;
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}
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assert(ptr == buf + kBlkSize);
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}
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/*
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* Debug: dump the contents of the partition map.
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*/
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/*static*/ void DiskFSFocusDrive::DumpPartitionMap(const PartitionMap* pMap)
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{
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int i;
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LOGI(" FocusDrive partition map (%d partitions):", pMap->partCount);
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for (i = 0; i < pMap->partCount; i++) {
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LOGI(" %2d: %8d %8d '%s'", i, pMap->entry[i].startBlock,
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pMap->entry[i].blockCount, pMap->entry[i].name);
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}
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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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DIError DiskFSFocusDrive::OpenSubVolume(long startBlock, long numBlocks,
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const char* name)
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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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//bool tweaked = false;
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LOGI("Adding %ld +%ld", startBlock, numBlocks);
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if (startBlock > fpImg->GetNumBlocks()) {
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LOGI("FocusDrive start block out of range (%ld vs %ld)",
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startBlock, fpImg->GetNumBlocks());
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return kDIErrBadPartition;
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}
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if (startBlock + numBlocks > fpImg->GetNumBlocks()) {
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LOGI("FocusDrive partition too large (%ld vs %ld avail)",
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numBlocks, fpImg->GetNumBlocks() - startBlock);
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fpImg->AddNote(DiskImg::kNoteInfo,
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"Reduced partition from %ld blocks to %ld.\n",
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numBlocks, fpImg->GetNumBlocks() - startBlock);
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numBlocks = fpImg->GetNumBlocks() - startBlock;
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//tweaked = true;
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}
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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(fpImg, startBlock, numBlocks);
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if (dierr != kDIErrNone) {
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LOGI(" FocusDriveSub: 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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/* figure out what the format is */
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dierr = pNewImg->AnalyzeImage();
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if (dierr != kDIErrNone) {
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LOGI(" FocusDriveSub: analysis failed (err=%d)", dierr);
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goto bail;
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}
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/* we allow unrecognized partitions */
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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(" FocusDriveSub (%ld,%ld): unable to identify filesystem",
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startBlock, numBlocks);
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DiskFSUnknown* pUnknownFS = new DiskFSUnknown;
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if (pUnknownFS == NULL) {
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dierr = kDIErrInternal;
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goto bail;
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}
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//pUnknownFS->SetVolumeInfo((const char*)pMap->pmParType);
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pNewFS = pUnknownFS;
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} else {
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/* open a DiskFS for the sub-image */
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LOGI(" FocusDriveSub (%ld,%ld) analyze succeeded!", startBlock, numBlocks);
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pNewFS = pNewImg->OpenAppropriateDiskFS(true);
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if (pNewFS == NULL) {
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LOGI(" FocusDriveSub: OpenAppropriateDiskFS failed");
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dierr = kDIErrUnsupportedFSFmt;
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goto bail;
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}
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}
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pNewImg->AddNote(DiskImg::kNoteInfo, "Partition name='%s'.", name);
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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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* If "initialize" fails, the sub-volume won't get added to the list.
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* It's important that a failure at this stage doesn't cause the whole
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* thing to fall over.
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*/
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InitMode initMode;
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if (GetScanForSubVolumes() == kScanSubContainerOnly)
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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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LOGE(" FocusDriveSub: error %d reading list of files from disk", dierr);
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goto bail;
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}
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/* add it to the list */
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AddSubVolumeToList(pNewImg, pNewFS);
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pNewImg = NULL;
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pNewFS = NULL;
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bail:
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delete pNewFS;
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delete pNewImg;
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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 FocusDrive volume.
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*/
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/*static*/ DIError DiskFSFocusDrive::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 partitions inside
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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) == kDIErrNone) {
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*pFormat = DiskImg::kFormatFocusDrive;
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*pOrder = DiskImg::kSectorOrderProDOS;
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return kDIErrNone;
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}
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LOGI(" FS didn't find valid FocusDrive");
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return kDIErrFilesystemNotFound;
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}
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/*
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* Prep the FocusDrive "container" for use.
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*/
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DIError DiskFSFocusDrive::Initialize(void)
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{
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DIError dierr = kDIErrNone;
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LOGI("FocusDrive 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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DIError DiskFSFocusDrive::FindSubVolumes(void)
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{
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DIError dierr = kDIErrNone;
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uint8_t buf[kBlkSize];
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uint8_t nameBuf[kBlkSize*2];
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PartitionMap map;
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int i;
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dierr = fpImg->ReadBlock(kPartMapBlock, buf);
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if (dierr != kDIErrNone)
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goto bail;
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dierr = fpImg->ReadBlock(kPartNameStart, nameBuf);
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if (dierr != kDIErrNone)
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goto bail;
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dierr = fpImg->ReadBlock(kPartNameStart+1, nameBuf+kBlkSize);
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if (dierr != kDIErrNone)
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goto bail;
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UnpackPartitionMap(buf, nameBuf, &map);
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DumpPartitionMap(&map);
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for (i = 0; i < map.partCount; i++) {
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dierr = OpenVol(i, map.entry[i].startBlock, map.entry[i].blockCount,
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(const char*)map.entry[i].name);
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if (dierr != kDIErrNone)
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goto bail;
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}
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bail:
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return dierr;
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}
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/*
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* Open the volume. If it fails, open a placeholder instead. (If *that*
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* fails, return with an error.)
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*/
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DIError DiskFSFocusDrive::OpenVol(int idx, long startBlock, long numBlocks,
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const char* name)
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{
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DIError dierr;
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dierr = OpenSubVolume(startBlock, numBlocks, name);
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if (dierr != kDIErrNone) {
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if (dierr == kDIErrCancelled)
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goto bail;
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DiskFS* pNewFS = NULL;
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DiskImg* pNewImg = NULL;
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LOGI(" FocusDrive failed opening sub-volume %d", idx);
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dierr = CreatePlaceholder(startBlock, numBlocks, name, NULL,
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&pNewImg, &pNewFS);
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if (dierr == kDIErrNone) {
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AddSubVolumeToList(pNewImg, pNewFS);
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} else {
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LOGI(" FocusDrive unable to create placeholder (err=%d)",
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dierr);
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// fall out with error
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}
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}
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bail:
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return dierr;
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}
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