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[SETUPLIB] Add helpers to determine whether a disk is partitioned as a "super-floppy" (#7310)
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Hermès Bélusca-Maïto
parent
ad5d9aa28a
commit
d6d3d0eacd
2 changed files with 120 additions and 42 deletions
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@ -478,33 +478,29 @@ EnumerateBiosDiskEntries(
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/*
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* Detects whether a disk reports as a "super-floppy", i.e. an unpartitioned
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* disk with a valid VBR, following the criteria used by IoReadPartitionTable()
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* Detects whether a disk is a "super-floppy", i.e. an unpartitioned
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* disk with only a valid VBR, as reported by IoReadPartitionTable()
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* and IoWritePartitionTable():
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* only one single partition starting at the beginning of the disk; the reported
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* defaults are: partition number being zero and its type being FAT16 non-bootable.
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* Note also that accessing \Device\HarddiskN\Partition0 or Partition1 returns
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* the same data.
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* only one single partition starting at offset zero and spanning the
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* whole disk, without hidden sectors, whose type is FAT16 non-bootable.
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*
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* Accessing \Device\HarddiskN\Partition0 or Partition1 on such disks
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* returns the same data.
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*/
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// static
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BOOLEAN
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IsSuperFloppy(
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IN PDISKENTRY DiskEntry)
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IsDiskSuperFloppy2(
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_In_ const DISK_PARTITION_INFO* DiskInfo,
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_In_opt_ const ULONGLONG* DiskSize,
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_In_ const PARTITION_INFORMATION* PartitionInfo)
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{
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PPARTITION_INFORMATION PartitionInfo;
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ULONGLONG PartitionLengthEstimate;
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/* No layout buffer: we cannot say anything yet */
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if (DiskEntry->LayoutBuffer == NULL)
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/* Structure size must be valid */
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if (DiskInfo->SizeOfPartitionInfo < RTL_SIZEOF_THROUGH_FIELD(DISK_PARTITION_INFO, Mbr))
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return FALSE;
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/* We must have only one partition */
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if (DiskEntry->LayoutBuffer->PartitionCount != 1)
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/* The layout must be MBR */
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if (DiskInfo->PartitionStyle != PARTITION_STYLE_MBR)
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return FALSE;
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/* Get the single partition entry */
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PartitionInfo = DiskEntry->LayoutBuffer->PartitionEntry;
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/* The single partition must start at the beginning of the disk */
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if (!(PartitionInfo->StartingOffset.QuadPart == 0 &&
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PartitionInfo->HiddenSectors == 0))
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@ -512,46 +508,112 @@ IsSuperFloppy(
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return FALSE;
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}
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/* The disk signature is usually set to one; warn in case it's not */
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if (DiskEntry->LayoutBuffer->Signature != 1)
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/* The disk signature is usually set to 1; warn in case it's not */
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if (DiskInfo->Mbr.Signature != 1)
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{
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DPRINT1("Super-Floppy disk %lu signature %08x != 1!\n",
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DiskEntry->DiskNumber, DiskEntry->LayoutBuffer->Signature);
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DPRINT1("Super-Floppy signature %08x != 1\n", DiskInfo->Mbr.Signature);
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}
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/*
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* The partition number must be zero or one, be recognized,
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* have FAT16 type and report as non-bootable.
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*/
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if ((PartitionInfo->PartitionNumber != 0 &&
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PartitionInfo->PartitionNumber != 1) ||
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PartitionInfo->RecognizedPartition != TRUE ||
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PartitionInfo->PartitionType != PARTITION_FAT_16 ||
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PartitionInfo->BootIndicator != FALSE)
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/* The partition must be recognized and report as FAT16 non-bootable */
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if ((PartitionInfo->RecognizedPartition != TRUE) ||
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(PartitionInfo->PartitionType != PARTITION_FAT_16) ||
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(PartitionInfo->BootIndicator != FALSE))
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{
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DPRINT1("Super-Floppy disk %lu does not return default settings!\n"
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" PartitionNumber = %lu, expected 0\n"
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DPRINT1("Super-Floppy does not return default settings:\n"
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" RecognizedPartition = %s, expected TRUE\n"
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" PartitionType = 0x%02x, expected 0x04 (PARTITION_FAT_16)\n"
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" BootIndicator = %s, expected FALSE\n",
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DiskEntry->DiskNumber,
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PartitionInfo->PartitionNumber,
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PartitionInfo->RecognizedPartition ? "TRUE" : "FALSE",
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PartitionInfo->PartitionType,
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PartitionInfo->BootIndicator ? "TRUE" : "FALSE");
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}
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/* The partition lengths should agree */
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PartitionLengthEstimate = GetDiskSizeInBytes(DiskEntry);
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if (PartitionInfo->PartitionLength.QuadPart != PartitionLengthEstimate)
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/* The partition and disk sizes should agree */
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if (DiskSize && (PartitionInfo->PartitionLength.QuadPart != *DiskSize))
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{
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DPRINT1("PartitionLength = %I64u is different from PartitionLengthEstimate = %I64u\n",
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PartitionInfo->PartitionLength.QuadPart, PartitionLengthEstimate);
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DPRINT1("PartitionLength = %I64u is different from DiskSize = %I64u\n",
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PartitionInfo->PartitionLength.QuadPart, *DiskSize);
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}
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return TRUE;
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}
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BOOLEAN
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IsDiskSuperFloppy(
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_In_ const DRIVE_LAYOUT_INFORMATION* Layout,
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_In_opt_ const ULONGLONG* DiskSize)
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{
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DISK_PARTITION_INFO DiskInfo;
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/* The layout must contain only one partition */
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if (Layout->PartitionCount != 1)
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return FALSE;
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/* Build the disk partition info */
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DiskInfo.SizeOfPartitionInfo = RTL_SIZEOF_THROUGH_FIELD(DISK_PARTITION_INFO, Mbr);
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DiskInfo.PartitionStyle = PARTITION_STYLE_MBR;
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DiskInfo.Mbr.Signature = Layout->Signature;
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DiskInfo.Mbr.CheckSum = 0; // Dummy value
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/* Call the helper on the single partition entry */
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return IsDiskSuperFloppy2(&DiskInfo, DiskSize, Layout->PartitionEntry);
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}
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BOOLEAN
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IsDiskSuperFloppyEx(
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_In_ const DRIVE_LAYOUT_INFORMATION_EX* LayoutEx,
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_In_opt_ const ULONGLONG* DiskSize)
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{
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DISK_PARTITION_INFO DiskInfo;
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const PARTITION_INFORMATION_EX* PartitionInfoEx;
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PARTITION_INFORMATION PartitionInfo;
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/* The layout must be MBR and contain only one partition */
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if (LayoutEx->PartitionStyle != PARTITION_STYLE_MBR)
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return FALSE;
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if (LayoutEx->PartitionCount != 1)
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return FALSE;
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/* Build the disk partition info */
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DiskInfo.SizeOfPartitionInfo = RTL_SIZEOF_THROUGH_FIELD(DISK_PARTITION_INFO, Mbr);
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DiskInfo.PartitionStyle = PARTITION_STYLE_MBR; // LayoutEx->PartitionStyle;
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DiskInfo.Mbr.Signature = LayoutEx->Mbr.Signature;
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DiskInfo.Mbr.CheckSum = 0; // Dummy value
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/* Convert the single partition entry */
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PartitionInfoEx = LayoutEx->PartitionEntry;
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PartitionInfo.StartingOffset = PartitionInfoEx->StartingOffset;
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PartitionInfo.PartitionLength = PartitionInfoEx->PartitionLength;
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PartitionInfo.HiddenSectors = PartitionInfoEx->Mbr.HiddenSectors;
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PartitionInfo.PartitionNumber = PartitionInfoEx->PartitionNumber;
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PartitionInfo.PartitionType = PartitionInfoEx->Mbr.PartitionType;
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PartitionInfo.BootIndicator = PartitionInfoEx->Mbr.BootIndicator;
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PartitionInfo.RecognizedPartition = PartitionInfoEx->Mbr.RecognizedPartition;
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PartitionInfo.RewritePartition = PartitionInfoEx->RewritePartition;
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/* Call the helper on the single partition entry */
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return IsDiskSuperFloppy2(&DiskInfo, DiskSize, &PartitionInfo);
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}
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BOOLEAN
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IsSuperFloppy(
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_In_ PDISKENTRY DiskEntry)
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{
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ULONGLONG DiskSize;
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/* No layout buffer: we cannot say anything yet */
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if (!DiskEntry->LayoutBuffer)
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return FALSE;
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/* The disk must be MBR */
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if (DiskEntry->DiskStyle != PARTITION_STYLE_MBR)
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return FALSE;
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DiskSize = GetDiskSizeInBytes(DiskEntry);
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return IsDiskSuperFloppy(DiskEntry->LayoutBuffer, &DiskSize);
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}
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/*
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* Inserts the disk region represented by PartEntry into either
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@ -258,9 +258,25 @@ RoundingDivide(
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((DiskEntry)->SectorCount.QuadPart * (DiskEntry)->BytesPerSector)
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BOOLEAN
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IsDiskSuperFloppy2(
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_In_ const DISK_PARTITION_INFO* DiskInfo,
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_In_opt_ const ULONGLONG* DiskSize,
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_In_ const PARTITION_INFORMATION* PartitionInfo);
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BOOLEAN
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IsDiskSuperFloppy(
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_In_ const DRIVE_LAYOUT_INFORMATION* Layout,
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_In_opt_ const ULONGLONG* DiskSize);
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BOOLEAN
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IsDiskSuperFloppyEx(
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_In_ const DRIVE_LAYOUT_INFORMATION_EX* LayoutEx,
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_In_opt_ const ULONGLONG* DiskSize);
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BOOLEAN
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IsSuperFloppy(
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IN PDISKENTRY DiskEntry);
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_In_ PDISKENTRY DiskEntry);
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BOOLEAN
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IsPartitionActive(
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