405 lines
13 KiB
C++
405 lines
13 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 "MicroDrive" DiskFS is a container class for multiple ProDOS and HFS
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* volumes. It represents a partitioned disk device, such as a hard
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* drive or CF card, that has been formatted for use with ///SHH Systeme's
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* MicroDrive card for the Apple II.
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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 unsigned int kPartSizeMask = 0x00ffffff;
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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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* The layout was discovered through reverse-engineering. Additional notes:
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*
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From Joachim Lange:
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Below, this is the configuration block as it is used in all
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MicroDrive cards. Please verify that my ID shortcut can be
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found at offset 0, otherwise the partition info is not
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valid. Most of the other parms are not useful, some are
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historic and not useful anymore. As a second security
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measure, verify that the first partition starts at
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absolute block 256. This is also a fixed value used in all
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MicroDrive cards. Of course the partition size is not two
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bytes long but three (not four), the 4th byte is used for
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switching drives in a two-drive configuration. So, for
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completeness, when reading partition sizes, perform a
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partitionLength[..] & 0x00FFFFFF, or at least issue a
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warning that something may be wrong. The offset
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(partitionStart) could reach into the 4th byte.
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I have attached the config block in a zip file because
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the mailer would probably re-format the source text.
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*/
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const int kMaxNumParts = 8;
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typedef struct DiskFSMicroDrive::PartitionMap {
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unsigned short magic; // partition signature
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unsigned short cylinders; // #of cylinders
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unsigned short reserved1; // ??
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unsigned short heads; // #of heads/cylinder
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unsigned short sectors; // #of sectors/track
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unsigned short reserved2; // ??
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unsigned char numPart1; // #of partitions in first chunk
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unsigned char numPart2; // #of partitions in second chunk
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unsigned char reserved3[10]; // bytes 0x0e-0x17
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unsigned short romVersion; // IIgs ROM01 or ROM03
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unsigned char reserved4[6]; // bytes 0x1a-0x1f
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unsigned long partitionStart1[kMaxNumParts]; // bytes 0x20-0x3f
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unsigned long partitionLength1[kMaxNumParts]; // bytes 0x40-0x5f
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unsigned char reserved5[32]; // bytes 0x60-0x7f
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unsigned long partitionStart2[kMaxNumParts]; // bytes 0x80-0x9f
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unsigned long partitionLength2[kMaxNumParts]; // bytes 0xa0-0xbf
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unsigned char padding[320];
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} PartitionMap;
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/*
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* Figure out if this is a MicroDrive 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
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DiskFSMicroDrive::TestImage(DiskImg* pImg, DiskImg::SectorOrder imageOrder)
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{
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DIError dierr = kDIErrNone;
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unsigned char blkBuf[kBlkSize];
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int partCount1, partCount2;
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assert(sizeof(PartitionMap) == kBlkSize);
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/*
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* See if block 0 is a MicroDrive 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 (GetShortLE(&blkBuf[0x00]) != kPartitionSignature) {
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LOGI(" MicroDrive 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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/* might assert that partCount2 be zero unless partCount1 == 8? */
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partCount1 = blkBuf[0x0c];
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partCount2 = blkBuf[0x0d];
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if (partCount1 == 0 || partCount1 > kMaxNumParts ||
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partCount2 > kMaxNumParts)
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{
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LOGI(" MicroDrive unreasonable partCount values %d/%d",
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partCount1, partCount2);
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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/* consider testing other fields */
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// success!
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LOGI(" MicroDrive partition map count = %d/%d", partCount1, partCount2);
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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
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DiskFSMicroDrive::UnpackPartitionMap(const unsigned char* buf,
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PartitionMap* pMap)
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{
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pMap->magic = GetShortLE(&buf[0x00]);
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pMap->cylinders = GetShortLE(&buf[0x02]);
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pMap->reserved1 = GetShortLE(&buf[0x04]);
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pMap->heads = GetShortLE(&buf[0x06]);
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pMap->sectors = GetShortLE(&buf[0x08]);
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pMap->reserved2 = GetShortLE(&buf[0x0a]);
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pMap->numPart1 = buf[0x0c];
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pMap->numPart2 = buf[0x0d];
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memcpy(pMap->reserved3, &buf[0x0e], sizeof(pMap->reserved3));
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pMap->romVersion = GetShortLE(&buf[0x18]);
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memcpy(pMap->reserved4, &buf[0x1a], sizeof(pMap->reserved4));
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for (int i = 0; i < kMaxNumParts; i++) {
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pMap->partitionStart1[i] = GetLongLE(&buf[0x20] + i * 4);
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pMap->partitionLength1[i] = GetLongLE(&buf[0x40] + i * 4) & kPartSizeMask;
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pMap->partitionStart2[i] = GetLongLE(&buf[0x80] + i * 4);
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pMap->partitionLength2[i] = GetLongLE(&buf[0xa0] + i * 4) & kPartSizeMask;
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}
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memcpy(pMap->reserved5, &buf[0x60], sizeof(pMap->reserved5));
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memcpy(pMap->padding, &buf[0x80], sizeof(pMap->padding));
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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
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DiskFSMicroDrive::DumpPartitionMap(const PartitionMap* pMap)
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{
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LOGI(" MicroDrive partition map:");
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LOGI(" cyls=%d res1=%d heads=%d sects=%d",
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pMap->cylinders, pMap->reserved1, pMap->heads, pMap->sectors);
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LOGI(" res2=%d numPart1=%d numPart2=%d",
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pMap->reserved2, pMap->numPart1, pMap->numPart2);
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LOGI(" romVersion=ROM%02d", pMap->romVersion);
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int i, parts;
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parts = pMap->numPart1;
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assert(parts <= kMaxNumParts);
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for (i = 0; i < parts; i++) {
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LOGI(" %2d: startLBA=%8ld length=%ld",
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i, pMap->partitionStart1[i], pMap->partitionLength1[i]);
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}
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parts = pMap->numPart2;
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assert(parts <= kMaxNumParts);
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for (i = 0; i < parts; i++) {
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LOGI(" %2d: startLBA=%8ld length=%ld",
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i+8, pMap->partitionStart2[i], pMap->partitionLength2[i]);
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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
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DiskFSMicroDrive::OpenSubVolume(long startBlock, long numBlocks)
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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("MicroDrive 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("MicroDrive 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(" MicroDriveSub: 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(" MicroDriveSub: 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(" MicroDriveSub (%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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//pNewImg->AddNote(DiskImg::kNoteInfo, "Partition name='%s' type='%s'.",
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// pMap->pmPartName, pMap->pmParType);
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} else {
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/* open a DiskFS for the sub-image */
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LOGI(" MicroDriveSub (%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(" MicroDriveSub: 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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/* 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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LOGI(" MicroDriveSub: 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 MicroDrive volume.
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*/
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/*static*/ DIError
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DiskFSMicroDrive::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::kFormatMicroDrive;
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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 MicroDrive");
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return kDIErrFilesystemNotFound;
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}
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/*
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* Prep the MicroDrive "container" for use.
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*/
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DIError
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DiskFSMicroDrive::Initialize(void)
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{
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DIError dierr = kDIErrNone;
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LOGI("MicroDrive 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
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DiskFSMicroDrive::FindSubVolumes(void)
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{
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DIError dierr = kDIErrNone;
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unsigned char buf[kBlkSize];
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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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UnpackPartitionMap(buf, &map);
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DumpPartitionMap(&map);
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/* first part of the table */
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for (i = 0; i < map.numPart1; i++) {
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dierr = OpenVol(i,
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map.partitionStart1[i], map.partitionLength1[i]);
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if (dierr != kDIErrNone)
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goto bail;
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}
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/* second part of the table */
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for (i = 0; i < map.numPart2; i++) {
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dierr = OpenVol(i + kMaxNumParts,
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map.partitionStart2[i], map.partitionLength2[i]);
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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
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DiskFSMicroDrive::OpenVol(int idx, long startBlock, long numBlocks)
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{
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DIError dierr;
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dierr = OpenSubVolume(startBlock, numBlocks);
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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(" MicroDrive failed opening sub-volume %d", idx);
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dierr = CreatePlaceholder(startBlock, numBlocks, NULL, 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(" MicroDrive 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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