* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/ntfs/attrib.c
* PURPOSE: NTFS filesystem driver
- * PROGRAMMER: Eric Kohl
- * Updated by Valentin Verkhovsky 2003/09/12
+ * PROGRAMMERS: Eric Kohl
+ * Valentin Verkhovsky
+ * Hervé Poussineau (hpoussin@reactos.org)
+ * Pierre Schweitzer (pierre@reactos.org)
*/
/* INCLUDES *****************************************************************/
/* FUNCTIONS ****************************************************************/
-static
-ULONG
-RunLength(PUCHAR run)
+/**
+* @name AddRun
+* @implemented
+*
+* Adds a run of allocated clusters to a non-resident attribute.
+*
+* @param Vcb
+* Pointer to an NTFS_VCB for the destination volume.
+*
+* @param AttrContext
+* Pointer to an NTFS_ATTR_CONTEXT describing the destination attribute.
+*
+* @param AttrOffset
+* Byte offset of the destination attribute relative to its file record.
+*
+* @param FileRecord
+* Pointer to a complete copy of the file record containing the destination attribute. Must be at least
+* Vcb->NtfsInfo.BytesPerFileRecord bytes long.
+*
+* @param NextAssignedCluster
+* Logical cluster number of the start of the data run being added.
+*
+* @param RunLength
+* How many clusters are in the data run being added. Can't be 0.
+*
+* @return
+* STATUS_SUCCESS on success. STATUS_INVALID_PARAMETER if AttrContext describes a resident attribute.
+* STATUS_INSUFFICIENT_RESOURCES if ConvertDataRunsToLargeMCB() fails.
+* STATUS_BUFFER_TOO_SMALL if ConvertLargeMCBToDataRuns() fails.
+* STATUS_NOT_IMPLEMENTED if we need to migrate the attribute to an attribute list (TODO).
+*
+* @remarks
+* Clusters should have been allocated previously with NtfsAllocateClusters().
+*
+*
+*/
+NTSTATUS
+AddRun(PNTFS_VCB Vcb,
+ PNTFS_ATTR_CONTEXT AttrContext,
+ ULONG AttrOffset,
+ PFILE_RECORD_HEADER FileRecord,
+ ULONGLONG NextAssignedCluster,
+ ULONG RunLength)
{
- return(*run & 0x0f) + ((*run >> 4) & 0x0f) + 1;
-}
+ NTSTATUS Status;
+ PUCHAR DataRun = (PUCHAR)&AttrContext->Record + AttrContext->Record.NonResident.MappingPairsOffset;
+ int DataRunMaxLength;
+ PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
+ LARGE_MCB DataRunsMCB;
+ ULONG NextAttributeOffset = AttrOffset + AttrContext->Record.Length;
+ ULONGLONG NextVBN = AttrContext->Record.NonResident.LowestVCN;
+
+ // Allocate some memory for the RunBuffer
+ PUCHAR RunBuffer;
+ ULONG RunBufferOffset = 0;
+
+ if (!AttrContext->Record.IsNonResident)
+ return STATUS_INVALID_PARAMETER;
+
+ RunBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+
+ // Convert the data runs to a map control block
+ Status = ConvertDataRunsToLargeMCB(DataRun, &DataRunsMCB, &NextVBN);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Unable to convert data runs to MCB (probably ran out of memory)!\n");
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return Status;
+ }
+
+ // Add newly-assigned clusters to mcb
+ _SEH2_TRY{
+ if (!FsRtlAddLargeMcbEntry(&DataRunsMCB,
+ NextVBN,
+ NextAssignedCluster,
+ RunLength))
+ {
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+ } _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ _SEH2_YIELD(return STATUS_INSUFFICIENT_RESOURCES);
+ } _SEH2_END;
-static
-LONGLONG
-RunLCN(PUCHAR run)
-{
- UCHAR n1 = *run & 0x0f;
- UCHAR n2 = (*run >> 4) & 0x0f;
- LONGLONG lcn = (n2 == 0) ? 0 : (CHAR)(run[n1 + n2]);
- LONG i = 0;
-
- for (i = n1 +n2 - 1; i > n1; i--)
- lcn = (lcn << 8) + run[i];
- return lcn;
+ // Convert the map control block back to encoded data runs
+ ConvertLargeMCBToDataRuns(&DataRunsMCB, RunBuffer, Vcb->NtfsInfo.BytesPerCluster, &RunBufferOffset);
+
+ // Get the amount of free space between the start of the of the first data run and the attribute end
+ DataRunMaxLength = AttrContext->Record.Length - AttrContext->Record.NonResident.MappingPairsOffset;
+
+ // Do we need to extend the attribute (or convert to attribute list)?
+ if (DataRunMaxLength < RunBufferOffset)
+ {
+ PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
+ DataRunMaxLength += Vcb->NtfsInfo.BytesPerFileRecord - NextAttributeOffset - (sizeof(ULONG) * 2);
+
+ // Can we move the end of the attribute?
+ if (NextAttribute->Type != AttributeEnd || DataRunMaxLength < RunBufferOffset - 1)
+ {
+ DPRINT1("FIXME: Need to create attribute list! Max Data Run Length available: %d\n", DataRunMaxLength);
+ if (NextAttribute->Type != AttributeEnd)
+ DPRINT1("There's another attribute after this one with type %0xlx\n", NextAttribute->Type);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ return STATUS_NOT_IMPLEMENTED;
+ }
+
+ // calculate position of end markers
+ NextAttributeOffset = AttrOffset + AttrContext->Record.NonResident.MappingPairsOffset + RunBufferOffset;
+ NextAttributeOffset = ALIGN_UP_BY(NextAttributeOffset, 8);
+
+ // Write the end markers
+ NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
+ NextAttribute->Type = AttributeEnd;
+ NextAttribute->Length = FILE_RECORD_END;
+
+ // Update the length
+ DestinationAttribute->Length = NextAttributeOffset - AttrOffset;
+ AttrContext->Record.Length = DestinationAttribute->Length;
+
+ // We need to increase the FileRecord size
+ FileRecord->BytesInUse = NextAttributeOffset + (sizeof(ULONG) * 2);
+ }
+
+ // NOTE: from this point on the original attribute record will contain invalid data in it's runbuffer
+ // TODO: Elegant fix? Could we free the old Record and allocate a new one without issue?
+
+ // Update HighestVCN
+ DestinationAttribute->NonResident.HighestVCN =
+ AttrContext->Record.NonResident.HighestVCN = max(NextVBN - 1 + RunLength,
+ AttrContext->Record.NonResident.HighestVCN);
+
+ // Write data runs to destination attribute
+ RtlCopyMemory((PVOID)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset),
+ RunBuffer,
+ RunBufferOffset);
+
+ // Update the file record
+ Status = UpdateFileRecord(Vcb, AttrContext->FileMFTIndex, FileRecord);
+
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+
+ NtfsDumpDataRuns((PUCHAR)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset), 0);
+
+ return Status;
}
+/**
+* @name ConvertDataRunsToLargeMCB
+* @implemented
+*
+* Converts binary data runs to a map control block.
+*
+* @param DataRun
+* Pointer to the run data
+*
+* @param DataRunsMCB
+* Pointer to an unitialized LARGE_MCB structure.
+*
+* @return
+* STATUS_SUCCESS on success, STATUS_INSUFFICIENT_RESOURCES if we fail to
+* initialize the mcb or add an entry.
+*
+* @remarks
+* Initializes the LARGE_MCB pointed to by DataRunsMCB. If this function succeeds, you
+* need to call FsRtlUninitializeLargeMcb() when you're done with DataRunsMCB. This
+* function will ensure the LargeMCB has been unitialized in case of failure.
+*
+*/
+NTSTATUS
+ConvertDataRunsToLargeMCB(PUCHAR DataRun,
+ PLARGE_MCB DataRunsMCB,
+ PULONGLONG pNextVBN)
+{
+ LONGLONG DataRunOffset;
+ ULONGLONG DataRunLength;
+ LONGLONG DataRunStartLCN;
+ ULONGLONG LastLCN = 0;
+
+ // Initialize the MCB, potentially catch an exception
+ _SEH2_TRY{
+ FsRtlInitializeLargeMcb(DataRunsMCB, NonPagedPool);
+ } _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
+ _SEH2_YIELD(return STATUS_INSUFFICIENT_RESOURCES);
+ } _SEH2_END;
+
+ while (*DataRun != 0)
+ {
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
-static
-ULONGLONG
-RunCount(PUCHAR run)
+ if (DataRunOffset != -1)
+ {
+ // Normal data run.
+ DataRunStartLCN = LastLCN + DataRunOffset;
+ LastLCN = DataRunStartLCN;
+
+ _SEH2_TRY{
+ if (!FsRtlAddLargeMcbEntry(DataRunsMCB,
+ *pNextVBN,
+ DataRunStartLCN,
+ DataRunLength))
+ {
+ FsRtlUninitializeLargeMcb(DataRunsMCB);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+ } _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
+ FsRtlUninitializeLargeMcb(DataRunsMCB);
+ _SEH2_YIELD(return STATUS_INSUFFICIENT_RESOURCES);
+ } _SEH2_END;
+
+ }
+
+ *pNextVBN += DataRunLength;
+ }
+
+ return STATUS_SUCCESS;
+}
+
+/**
+* @name ConvertLargeMCBToDataRuns
+* @implemented
+*
+* Converts a map control block to a series of encoded data runs (used by non-resident attributes).
+*
+* @param DataRunsMCB
+* Pointer to a LARGE_MCB structure describing the data runs.
+*
+* @param RunBuffer
+* Pointer to the buffer that will receive the encoded data runs.
+*
+* @param MaxBufferSize
+* Size of RunBuffer, in bytes.
+*
+* @param UsedBufferSize
+* Pointer to a ULONG that will receive the size of the data runs in bytes. Can't be NULL.
+*
+* @return
+* STATUS_SUCCESS on success, STATUS_BUFFER_TOO_SMALL if RunBuffer is too small to contain the
+* complete output.
+*
+*/
+NTSTATUS
+ConvertLargeMCBToDataRuns(PLARGE_MCB DataRunsMCB,
+ PUCHAR RunBuffer,
+ ULONG MaxBufferSize,
+ PULONG UsedBufferSize)
{
- UCHAR n = *run & 0xf;
- ULONGLONG count = 0;
- ULONG i = 0;
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG RunBufferOffset = 0;
+ LONGLONG DataRunOffset;
+ ULONGLONG LastLCN = 0;
+ LONGLONG Vbn, Lbn, Count;
+ int i;
+
- for (i = n; i > 0; i--)
- count = (count << 8) + run[i];
- return count;
+ DPRINT("\t[Vbn, Lbn, Count]\n");
+
+ // convert each mcb entry to a data run
+ for (i = 0; FsRtlGetNextLargeMcbEntry(DataRunsMCB, i, &Vbn, &Lbn, &Count); i++)
+ {
+ UCHAR DataRunOffsetSize = 0;
+ UCHAR DataRunLengthSize = 0;
+ UCHAR ControlByte = 0;
+
+ // [vbn, lbn, count]
+ DPRINT("\t[%I64d, %I64d,%I64d]\n", Vbn, Lbn, Count);
+
+ // TODO: check for holes and convert to sparse runs
+ DataRunOffset = Lbn - LastLCN;
+ LastLCN = Lbn;
+
+ // now we need to determine how to represent DataRunOffset with the minimum number of bytes
+ DPRINT("Determining how many bytes needed to represent %I64x\n", DataRunOffset);
+ DataRunOffsetSize = GetPackedByteCount(DataRunOffset, TRUE);
+ DPRINT("%d bytes needed.\n", DataRunOffsetSize);
+
+ // determine how to represent DataRunLengthSize with the minimum number of bytes
+ DPRINT("Determining how many bytes needed to represent %I64x\n", Count);
+ DataRunLengthSize = GetPackedByteCount(Count, TRUE);
+ DPRINT("%d bytes needed.\n", DataRunLengthSize);
+
+ // ensure the next data run + end marker would be > Max buffer size
+ if (RunBufferOffset + 2 + DataRunLengthSize + DataRunOffsetSize > MaxBufferSize)
+ {
+ Status = STATUS_BUFFER_TOO_SMALL;
+ DPRINT1("FIXME: Ran out of room in buffer for data runs!\n");
+ break;
+ }
+
+ // pack and copy the control byte
+ ControlByte = (DataRunOffsetSize << 4) + DataRunLengthSize;
+ RunBuffer[RunBufferOffset++] = ControlByte;
+
+ // copy DataRunLength
+ RtlCopyMemory(RunBuffer + RunBufferOffset, &Count, DataRunLengthSize);
+ RunBufferOffset += DataRunLengthSize;
+
+ // copy DataRunOffset
+ RtlCopyMemory(RunBuffer + RunBufferOffset, &DataRunOffset, DataRunOffsetSize);
+ RunBufferOffset += DataRunOffsetSize;
+ }
+
+ // End of data runs
+ RunBuffer[RunBufferOffset++] = 0;
+
+ *UsedBufferSize = RunBufferOffset;
+ DPRINT("New Size of DataRuns: %ld\n", *UsedBufferSize);
+
+ return Status;
}
+PUCHAR
+DecodeRun(PUCHAR DataRun,
+ LONGLONG *DataRunOffset,
+ ULONGLONG *DataRunLength)
+{
+ UCHAR DataRunOffsetSize;
+ UCHAR DataRunLengthSize;
+ CHAR i;
+
+ DataRunOffsetSize = (*DataRun >> 4) & 0xF;
+ DataRunLengthSize = *DataRun & 0xF;
+ *DataRunOffset = 0;
+ *DataRunLength = 0;
+ DataRun++;
+ for (i = 0; i < DataRunLengthSize; i++)
+ {
+ *DataRunLength += ((ULONG64)*DataRun) << (i * 8);
+ DataRun++;
+ }
+
+ /* NTFS 3+ sparse files */
+ if (DataRunOffsetSize == 0)
+ {
+ *DataRunOffset = -1;
+ }
+ else
+ {
+ for (i = 0; i < DataRunOffsetSize - 1; i++)
+ {
+ *DataRunOffset += ((ULONG64)*DataRun) << (i * 8);
+ DataRun++;
+ }
+ /* The last byte contains sign so we must process it different way. */
+ *DataRunOffset = ((LONG64)(CHAR)(*(DataRun++)) << (i * 8)) + *DataRunOffset;
+ }
+
+ DPRINT("DataRunOffsetSize: %x\n", DataRunOffsetSize);
+ DPRINT("DataRunLengthSize: %x\n", DataRunLengthSize);
+ DPRINT("DataRunOffset: %x\n", *DataRunOffset);
+ DPRINT("DataRunLength: %x\n", *DataRunLength);
+
+ return DataRun;
+}
BOOLEAN
-FindRun(PNONRESIDENT_ATTRIBUTE NresAttr,
+FindRun(PNTFS_ATTR_RECORD NresAttr,
ULONGLONG vcn,
PULONGLONG lcn,
PULONGLONG count)
{
- PUCHAR run;
- ULONGLONG base = NresAttr->StartVcn;
-
- if (vcn < NresAttr->StartVcn || vcn > NresAttr->LastVcn)
+ if (vcn < NresAttr->NonResident.LowestVCN || vcn > NresAttr->NonResident.HighestVCN)
return FALSE;
- *lcn = 0;
+ DecodeRun((PUCHAR)((ULONG_PTR)NresAttr + NresAttr->NonResident.MappingPairsOffset), (PLONGLONG)lcn, count);
+
+ return TRUE;
+}
- for (run = (PUCHAR)((ULONG_PTR)NresAttr + NresAttr->RunArrayOffset);
- *run != 0; run += RunLength(run))
+/**
+* @name FreeClusters
+* @implemented
+*
+* Shrinks the allocation size of a non-resident attribute by a given number of clusters.
+* Frees the clusters from the volume's $BITMAP file as well as the attribute's data runs.
+*
+* @param Vcb
+* Pointer to an NTFS_VCB for the destination volume.
+*
+* @param AttrContext
+* Pointer to an NTFS_ATTR_CONTEXT describing the attribute from which the clusters will be freed.
+*
+* @param AttrOffset
+* Byte offset of the destination attribute relative to its file record.
+*
+* @param FileRecord
+* Pointer to a complete copy of the file record containing the attribute. Must be at least
+* Vcb->NtfsInfo.BytesPerFileRecord bytes long.
+*
+* @param ClustersToFree
+* Number of clusters that should be freed from the end of the data stream. Must be no more
+* Than the number of clusters assigned to the attribute (HighestVCN + 1).
+*
+* @return
+* STATUS_SUCCESS on success. STATUS_INVALID_PARAMETER if AttrContext describes a resident attribute,
+* or if the caller requested more clusters be freed than the attribute has been allocated.
+* STATUS_INSUFFICIENT_RESOURCES if ConvertDataRunsToLargeMCB() fails.
+* STATUS_BUFFER_TOO_SMALL if ConvertLargeMCBToDataRuns() fails.
+*
+*
+*/
+NTSTATUS
+FreeClusters(PNTFS_VCB Vcb,
+ PNTFS_ATTR_CONTEXT AttrContext,
+ ULONG AttrOffset,
+ PFILE_RECORD_HEADER FileRecord,
+ ULONG ClustersToFree)
+{
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG ClustersLeftToFree = ClustersToFree;
+
+ // convert data runs to mcb
+ PUCHAR DataRun = (PUCHAR)&AttrContext->Record + AttrContext->Record.NonResident.MappingPairsOffset;
+ PNTFS_ATTR_RECORD DestinationAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + AttrOffset);
+ LARGE_MCB DataRunsMCB;
+ ULONG NextAttributeOffset = AttrOffset + AttrContext->Record.Length;
+ PNTFS_ATTR_RECORD NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + NextAttributeOffset);
+ ULONGLONG NextVBN = AttrContext->Record.NonResident.LowestVCN;
+
+ // Allocate some memory for the RunBuffer
+ PUCHAR RunBuffer = ExAllocatePoolWithTag(NonPagedPool, Vcb->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+ ULONG RunBufferOffset = 0;
+
+ PFILE_RECORD_HEADER BitmapRecord;
+ PNTFS_ATTR_CONTEXT DataContext;
+ ULONGLONG BitmapDataSize;
+ PUCHAR BitmapData;
+ RTL_BITMAP Bitmap;
+ ULONG LengthWritten;
+
+ if (!AttrContext->Record.IsNonResident)
{
- *lcn += RunLCN(run);
- *count = RunCount(run);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return STATUS_INVALID_PARAMETER;
+ }
- if (base <= vcn && vcn < base + *count)
+ // Convert the data runs to a map control block
+ Status = ConvertDataRunsToLargeMCB(DataRun, &DataRunsMCB, &NextVBN);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Unable to convert data runs to MCB (probably ran out of memory)!\n");
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return Status;
+ }
+
+ BitmapRecord = ExAllocatePoolWithTag(NonPagedPool,
+ Vcb->NtfsInfo.BytesPerFileRecord,
+ TAG_NTFS);
+ if (BitmapRecord == NULL)
+ {
+ DPRINT1("Error: Unable to allocate memory for bitmap file record!\n");
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return STATUS_NO_MEMORY;
+ }
+
+ Status = ReadFileRecord(Vcb, NTFS_FILE_BITMAP, BitmapRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Error: Unable to read file record for bitmap!\n");
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return 0;
+ }
+
+ Status = FindAttribute(Vcb, BitmapRecord, AttributeData, L"", 0, &DataContext, NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Error: Unable to find data attribute for bitmap file!\n");
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return 0;
+ }
+
+ BitmapDataSize = AttributeDataLength(&DataContext->Record);
+ BitmapDataSize = min(BitmapDataSize, 0xffffffff);
+ ASSERT((BitmapDataSize * 8) >= Vcb->NtfsInfo.ClusterCount);
+ BitmapData = ExAllocatePoolWithTag(NonPagedPool, ROUND_UP(BitmapDataSize, Vcb->NtfsInfo.BytesPerSector), TAG_NTFS);
+ if (BitmapData == NULL)
+ {
+ DPRINT1("Error: Unable to allocate memory for bitmap file data!\n");
+ ReleaseAttributeContext(DataContext);
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return 0;
+ }
+
+ ReadAttribute(Vcb, DataContext, 0, (PCHAR)BitmapData, (ULONG)BitmapDataSize);
+
+ RtlInitializeBitMap(&Bitmap, (PULONG)BitmapData, Vcb->NtfsInfo.ClusterCount);
+
+ // free clusters in $BITMAP file
+ while (ClustersLeftToFree > 0)
+ {
+ LONGLONG LargeVbn, LargeLbn;
+
+ if (!FsRtlLookupLastLargeMcbEntry(&DataRunsMCB, &LargeVbn, &LargeLbn))
{
- *lcn = (RunLCN(run) == 0) ? 0 : *lcn + vcn - base;
- *count -= (ULONG)(vcn - base);
+ Status = STATUS_INVALID_PARAMETER;
+ DPRINT1("DRIVER ERROR: FreeClusters called to free %lu clusters, which is %lu more clusters than are assigned to attribute!",
+ ClustersToFree,
+ ClustersLeftToFree);
+ break;
+ }
- return TRUE;
+ if( LargeLbn != -1)
+ {
+ // deallocate this cluster
+ RtlClearBits(&Bitmap, LargeLbn, 1);
}
- else
+ FsRtlTruncateLargeMcb(&DataRunsMCB, AttrContext->Record.NonResident.HighestVCN);
+ AttrContext->Record.NonResident.HighestVCN = min(AttrContext->Record.NonResident.HighestVCN, AttrContext->Record.NonResident.HighestVCN - 1);
+ ClustersLeftToFree--;
+ }
+
+ // update $BITMAP file on disk
+ Status = WriteAttribute(Vcb, DataContext, 0, BitmapData, (ULONG)BitmapDataSize, &LengthWritten);
+ if (!NT_SUCCESS(Status))
+ {
+ ReleaseAttributeContext(DataContext);
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(BitmapData, TAG_NTFS);
+ ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+ return Status;
+ }
+
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(BitmapData, TAG_NTFS);
+ ExFreePoolWithTag(BitmapRecord, TAG_NTFS);
+
+ // Convert the map control block back to encoded data runs
+ ConvertLargeMCBToDataRuns(&DataRunsMCB, RunBuffer, Vcb->NtfsInfo.BytesPerCluster, &RunBufferOffset);
+
+ // Update HighestVCN
+ DestinationAttribute->NonResident.HighestVCN = AttrContext->Record.NonResident.HighestVCN;
+
+ // Write data runs to destination attribute
+ RtlCopyMemory((PVOID)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset),
+ RunBuffer,
+ RunBufferOffset);
+
+ if (NextAttribute->Type == AttributeEnd)
+ {
+ // update attribute length
+ AttrContext->Record.Length = ALIGN_UP_BY(AttrContext->Record.NonResident.MappingPairsOffset + RunBufferOffset, 8);
+ DestinationAttribute->Length = AttrContext->Record.Length;
+
+ // write end markers
+ NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)DestinationAttribute + DestinationAttribute->Length);
+ NextAttribute->Type = AttributeEnd;
+ NextAttribute->Length = FILE_RECORD_END;
+
+ // update file record length
+ FileRecord->BytesInUse = AttrOffset + DestinationAttribute->Length + (sizeof(ULONG) * 2);
+ }
+
+ // Update the file record
+ Status = UpdateFileRecord(Vcb, AttrContext->FileMFTIndex, FileRecord);
+
+ FsRtlUninitializeLargeMcb(&DataRunsMCB);
+ ExFreePoolWithTag(RunBuffer, TAG_NTFS);
+
+ NtfsDumpDataRuns((PUCHAR)((ULONG_PTR)DestinationAttribute + DestinationAttribute->NonResident.MappingPairsOffset), 0);
+
+ return Status;
+}
+
+static
+NTSTATUS
+InternalReadNonResidentAttributes(PFIND_ATTR_CONTXT Context)
+{
+ ULONGLONG ListSize;
+ PNTFS_ATTR_RECORD Attribute;
+ PNTFS_ATTR_CONTEXT ListContext;
+
+ DPRINT("InternalReadNonResidentAttributes(%p)\n", Context);
+
+ Attribute = Context->CurrAttr;
+ ASSERT(Attribute->Type == AttributeAttributeList);
+
+ if (Context->OnlyResident)
+ {
+ Context->NonResidentStart = NULL;
+ Context->NonResidentEnd = NULL;
+ return STATUS_SUCCESS;
+ }
+
+ if (Context->NonResidentStart != NULL)
+ {
+ return STATUS_FILE_CORRUPT_ERROR;
+ }
+
+ ListContext = PrepareAttributeContext(Attribute);
+ ListSize = AttributeDataLength(&ListContext->Record);
+ if (ListSize > 0xFFFFFFFF)
+ {
+ ReleaseAttributeContext(ListContext);
+ return STATUS_BUFFER_OVERFLOW;
+ }
+
+ Context->NonResidentStart = ExAllocatePoolWithTag(NonPagedPool, (ULONG)ListSize, TAG_NTFS);
+ if (Context->NonResidentStart == NULL)
+ {
+ ReleaseAttributeContext(ListContext);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+
+ if (ReadAttribute(Context->Vcb, ListContext, 0, (PCHAR)Context->NonResidentStart, (ULONG)ListSize) != ListSize)
+ {
+ ExFreePoolWithTag(Context->NonResidentStart, TAG_NTFS);
+ Context->NonResidentStart = NULL;
+ ReleaseAttributeContext(ListContext);
+ return STATUS_FILE_CORRUPT_ERROR;
+ }
+
+ ReleaseAttributeContext(ListContext);
+ Context->NonResidentEnd = (PNTFS_ATTR_RECORD)((PCHAR)Context->NonResidentStart + ListSize);
+ return STATUS_SUCCESS;
+}
+
+static
+PNTFS_ATTR_RECORD
+InternalGetNextAttribute(PFIND_ATTR_CONTXT Context)
+{
+ PNTFS_ATTR_RECORD NextAttribute;
+
+ if (Context->CurrAttr == (PVOID)-1)
+ {
+ return NULL;
+ }
+
+ if (Context->CurrAttr >= Context->FirstAttr &&
+ Context->CurrAttr < Context->LastAttr)
+ {
+ if (Context->CurrAttr->Length == 0)
{
- base += *count;
+ DPRINT1("Broken length!\n");
+ Context->CurrAttr = (PVOID)-1;
+ return NULL;
+ }
+
+ NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)Context->CurrAttr + Context->CurrAttr->Length);
+
+ if (NextAttribute > Context->LastAttr || NextAttribute < Context->FirstAttr)
+ {
+ DPRINT1("Broken length: 0x%lx!\n", Context->CurrAttr->Length);
+ Context->CurrAttr = (PVOID)-1;
+ return NULL;
+ }
+
+ Context->Offset += ((ULONG_PTR)NextAttribute - (ULONG_PTR)Context->CurrAttr);
+ Context->CurrAttr = NextAttribute;
+
+ if (Context->CurrAttr < Context->LastAttr &&
+ Context->CurrAttr->Type != AttributeEnd)
+ {
+ return Context->CurrAttr;
}
}
- return FALSE;
+ if (Context->NonResidentStart == NULL)
+ {
+ Context->CurrAttr = (PVOID)-1;
+ return NULL;
+ }
+
+ if (Context->CurrAttr < Context->NonResidentStart ||
+ Context->CurrAttr >= Context->NonResidentEnd)
+ {
+ Context->CurrAttr = Context->NonResidentStart;
+ }
+ else if (Context->CurrAttr->Length != 0)
+ {
+ NextAttribute = (PNTFS_ATTR_RECORD)((ULONG_PTR)Context->CurrAttr + Context->CurrAttr->Length);
+ Context->Offset += ((ULONG_PTR)NextAttribute - (ULONG_PTR)Context->CurrAttr);
+ Context->CurrAttr = NextAttribute;
+ }
+ else
+ {
+ DPRINT1("Broken length!\n");
+ Context->CurrAttr = (PVOID)-1;
+ return NULL;
+ }
+
+ if (Context->CurrAttr < Context->NonResidentEnd &&
+ Context->CurrAttr->Type != AttributeEnd)
+ {
+ return Context->CurrAttr;
+ }
+
+ Context->CurrAttr = (PVOID)-1;
+ return NULL;
}
+NTSTATUS
+FindFirstAttribute(PFIND_ATTR_CONTXT Context,
+ PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER FileRecord,
+ BOOLEAN OnlyResident,
+ PNTFS_ATTR_RECORD * Attribute)
+{
+ NTSTATUS Status;
+
+ DPRINT("FindFistAttribute(%p, %p, %p, %p, %u, %p)\n", Context, Vcb, FileRecord, OnlyResident, Attribute);
+
+ Context->Vcb = Vcb;
+ Context->OnlyResident = OnlyResident;
+ Context->FirstAttr = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + FileRecord->AttributeOffset);
+ Context->CurrAttr = Context->FirstAttr;
+ Context->LastAttr = (PNTFS_ATTR_RECORD)((ULONG_PTR)FileRecord + FileRecord->BytesInUse);
+ Context->NonResidentStart = NULL;
+ Context->NonResidentEnd = NULL;
+ Context->Offset = FileRecord->AttributeOffset;
+
+ if (Context->FirstAttr->Type == AttributeEnd)
+ {
+ Context->CurrAttr = (PVOID)-1;
+ return STATUS_END_OF_FILE;
+ }
+ else if (Context->FirstAttr->Type == AttributeAttributeList)
+ {
+ Status = InternalReadNonResidentAttributes(Context);
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+
+ *Attribute = InternalGetNextAttribute(Context);
+ if (*Attribute == NULL)
+ {
+ return STATUS_END_OF_FILE;
+ }
+ }
+ else
+ {
+ *Attribute = Context->CurrAttr;
+ Context->Offset = (UCHAR*)Context->CurrAttr - (UCHAR*)FileRecord;
+ }
+
+ return STATUS_SUCCESS;
+}
+
+NTSTATUS
+FindNextAttribute(PFIND_ATTR_CONTXT Context,
+ PNTFS_ATTR_RECORD * Attribute)
+{
+ NTSTATUS Status;
+
+ DPRINT("FindNextAttribute(%p, %p)\n", Context, Attribute);
+
+ *Attribute = InternalGetNextAttribute(Context);
+ if (*Attribute == NULL)
+ {
+ return STATUS_END_OF_FILE;
+ }
+
+ if (Context->CurrAttr->Type != AttributeAttributeList)
+ {
+ return STATUS_SUCCESS;
+ }
+
+ Status = InternalReadNonResidentAttributes(Context);
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+
+ *Attribute = InternalGetNextAttribute(Context);
+ if (*Attribute == NULL)
+ {
+ return STATUS_END_OF_FILE;
+ }
+
+ return STATUS_SUCCESS;
+}
+
+VOID
+FindCloseAttribute(PFIND_ATTR_CONTXT Context)
+{
+ if (Context->NonResidentStart != NULL)
+ {
+ ExFreePoolWithTag(Context->NonResidentStart, TAG_NTFS);
+ Context->NonResidentStart = NULL;
+ }
+}
static
VOID
-NtfsDumpFileNameAttribute(PATTRIBUTE Attribute)
+NtfsDumpFileNameAttribute(PNTFS_ATTR_RECORD Attribute)
{
- PRESIDENT_ATTRIBUTE ResAttr;
PFILENAME_ATTRIBUTE FileNameAttr;
DbgPrint(" $FILE_NAME ");
- ResAttr = (PRESIDENT_ATTRIBUTE)Attribute;
-// DbgPrint(" Length %lu Offset %hu ", ResAttr->ValueLength, ResAttr->ValueOffset);
+// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
+
+ FileNameAttr = (PFILENAME_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+ DbgPrint(" (%x) '%.*S' ", FileNameAttr->NameType, FileNameAttr->NameLength, FileNameAttr->Name);
+ DbgPrint(" '%x' \n", FileNameAttr->FileAttributes);
+ DbgPrint(" AllocatedSize: %I64u\nDataSize: %I64u\n", FileNameAttr->AllocatedSize, FileNameAttr->DataSize);
+}
+
+
+static
+VOID
+NtfsDumpStandardInformationAttribute(PNTFS_ATTR_RECORD Attribute)
+{
+ PSTANDARD_INFORMATION StandardInfoAttr;
+
+ DbgPrint(" $STANDARD_INFORMATION ");
+
+// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
- FileNameAttr = (PFILENAME_ATTRIBUTE)((ULONG_PTR)ResAttr + ResAttr->ValueOffset);
- DbgPrint(" '%.*S' ", FileNameAttr->NameLength, FileNameAttr->Name);
+ StandardInfoAttr = (PSTANDARD_INFORMATION)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+ DbgPrint(" '%x' ", StandardInfoAttr->FileAttribute);
}
static
VOID
-NtfsDumpVolumeNameAttribute(PATTRIBUTE Attribute)
+NtfsDumpVolumeNameAttribute(PNTFS_ATTR_RECORD Attribute)
{
- PRESIDENT_ATTRIBUTE ResAttr;
PWCHAR VolumeName;
DbgPrint(" $VOLUME_NAME ");
- ResAttr = (PRESIDENT_ATTRIBUTE)Attribute;
-// DbgPrint(" Length %lu Offset %hu ", ResAttr->ValueLength, ResAttr->ValueOffset);
+// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
- VolumeName = (PWCHAR)((ULONG_PTR)ResAttr + ResAttr->ValueOffset);
- DbgPrint(" '%.*S' ", ResAttr->ValueLength / sizeof(WCHAR), VolumeName);
+ VolumeName = (PWCHAR)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+ DbgPrint(" '%.*S' ", Attribute->Resident.ValueLength / sizeof(WCHAR), VolumeName);
}
static
VOID
-NtfsDumpVolumeInformationAttribute(PATTRIBUTE Attribute)
+NtfsDumpVolumeInformationAttribute(PNTFS_ATTR_RECORD Attribute)
{
- PRESIDENT_ATTRIBUTE ResAttr;
PVOLINFO_ATTRIBUTE VolInfoAttr;
DbgPrint(" $VOLUME_INFORMATION ");
- ResAttr = (PRESIDENT_ATTRIBUTE)Attribute;
-// DbgPrint(" Length %lu Offset %hu ", ResAttr->ValueLength, ResAttr->ValueOffset);
+// DbgPrint(" Length %lu Offset %hu ", Attribute->Resident.ValueLength, Attribute->Resident.ValueOffset);
- VolInfoAttr = (PVOLINFO_ATTRIBUTE)((ULONG_PTR)ResAttr + ResAttr->ValueOffset);
+ VolInfoAttr = (PVOLINFO_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
DbgPrint(" NTFS Version %u.%u Flags 0x%04hx ",
VolInfoAttr->MajorVersion,
VolInfoAttr->MinorVersion,
static
VOID
-NtfsDumpAttribute (PATTRIBUTE Attribute)
+NtfsDumpIndexRootAttribute(PNTFS_ATTR_RECORD Attribute)
+{
+ PINDEX_ROOT_ATTRIBUTE IndexRootAttr;
+
+ IndexRootAttr = (PINDEX_ROOT_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+
+ if (IndexRootAttr->AttributeType == AttributeFileName)
+ ASSERT(IndexRootAttr->CollationRule == COLLATION_FILE_NAME);
+
+ DbgPrint(" $INDEX_ROOT (%uB, %u) ", IndexRootAttr->SizeOfEntry, IndexRootAttr->ClustersPerIndexRecord);
+
+ if (IndexRootAttr->Header.Flags == INDEX_ROOT_SMALL)
+ {
+ DbgPrint(" (small) ");
+ }
+ else
+ {
+ ASSERT(IndexRootAttr->Header.Flags == INDEX_ROOT_LARGE);
+ DbgPrint(" (large) ");
+ }
+}
+
+
+static
+VOID
+NtfsDumpAttribute(PDEVICE_EXTENSION Vcb,
+ PNTFS_ATTR_RECORD Attribute)
{
- PNONRESIDENT_ATTRIBUTE NresAttr;
UNICODE_STRING Name;
ULONGLONG lcn = 0;
ULONGLONG runcount = 0;
- switch (Attribute->AttributeType)
+ switch (Attribute->Type)
{
case AttributeFileName:
NtfsDumpFileNameAttribute(Attribute);
break;
case AttributeStandardInformation:
- DbgPrint(" $STANDARD_INFORMATION ");
- break;
-
- case AttributeAttributeList:
- DbgPrint(" $ATTRIBUTE_LIST ");
+ NtfsDumpStandardInformationAttribute(Attribute);
break;
case AttributeObjectId:
break;
case AttributeIndexRoot:
- DbgPrint(" $INDEX_ROOT ");
+ NtfsDumpIndexRootAttribute(Attribute);
break;
case AttributeIndexAllocation:
default:
DbgPrint(" Attribute %lx ",
- Attribute->AttributeType);
+ Attribute->Type);
break;
}
- if (Attribute->NameLength != 0)
+ if (Attribute->Type != AttributeAttributeList)
{
- Name.Length = Attribute->NameLength * sizeof(WCHAR);
- Name.MaximumLength = Name.Length;
- Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
+ if (Attribute->NameLength != 0)
+ {
+ Name.Length = Attribute->NameLength * sizeof(WCHAR);
+ Name.MaximumLength = Name.Length;
+ Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
+
+ DbgPrint("'%wZ' ", &Name);
+ }
- DbgPrint("'%wZ' ", &Name);
+ DbgPrint("(%s)\n",
+ Attribute->IsNonResident ? "non-resident" : "resident");
+
+ if (Attribute->IsNonResident)
+ {
+ FindRun(Attribute,0,&lcn, &runcount);
+
+ DbgPrint(" AllocatedSize %I64u DataSize %I64u InitilizedSize %I64u\n",
+ Attribute->NonResident.AllocatedSize, Attribute->NonResident.DataSize, Attribute->NonResident.InitializedSize);
+ DbgPrint(" logical clusters: %I64u - %I64u\n",
+ lcn, lcn + runcount - 1);
+ }
+ else
+ DbgPrint(" %u bytes of data\n", Attribute->Resident.ValueLength);
}
+}
+
+
+VOID NtfsDumpDataRunData(PUCHAR DataRun)
+{
+ UCHAR DataRunOffsetSize;
+ UCHAR DataRunLengthSize;
+ CHAR i;
+
+ DbgPrint("%02x ", *DataRun);
- DbgPrint("(%s)\n",
- Attribute->Nonresident ? "non-resident" : "resident");
+ if (*DataRun == 0)
+ return;
- if (Attribute->Nonresident)
+ DataRunOffsetSize = (*DataRun >> 4) & 0xF;
+ DataRunLengthSize = *DataRun & 0xF;
+
+ DataRun++;
+ for (i = 0; i < DataRunLengthSize; i++)
{
- NresAttr = (PNONRESIDENT_ATTRIBUTE)Attribute;
+ DbgPrint("%02x ", *DataRun);
+ DataRun++;
+ }
+
+ for (i = 0; i < DataRunOffsetSize; i++)
+ {
+ DbgPrint("%02x ", *DataRun);
+ DataRun++;
+ }
- FindRun(NresAttr,0,&lcn, &runcount);
+ NtfsDumpDataRunData(DataRun);
+}
+
+
+VOID
+NtfsDumpDataRuns(PVOID StartOfRun,
+ ULONGLONG CurrentLCN)
+{
+ PUCHAR DataRun = StartOfRun;
+ LONGLONG DataRunOffset;
+ ULONGLONG DataRunLength;
- DbgPrint(" AllocatedSize %I64u DataSize %I64u\n",
- NresAttr->AllocatedSize, NresAttr->DataSize);
- DbgPrint(" logical clusters: %I64u - %I64u\n",
- lcn, lcn + runcount - 1);
+ if (CurrentLCN == 0)
+ {
+ DPRINT1("Dumping data runs.\n\tData:\n\t\t");
+ NtfsDumpDataRunData(StartOfRun);
+ DbgPrint("\n\tRuns:\n\t\tOff\t\tLCN\t\tLength\n");
}
+
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
+
+ if (DataRunOffset != -1)
+ CurrentLCN += DataRunOffset;
+
+ DbgPrint("\t\t%I64d\t", DataRunOffset);
+ if (DataRunOffset < 99999)
+ DbgPrint("\t");
+ DbgPrint("%I64u\t", CurrentLCN);
+ if (CurrentLCN < 99999)
+ DbgPrint("\t");
+ DbgPrint("%I64u\n", DataRunLength);
+
+ if (*DataRun == 0)
+ DbgPrint("\t\t00\n");
+ else
+ NtfsDumpDataRuns(DataRun, CurrentLCN);
}
VOID
-NtfsDumpFileAttributes(PFILE_RECORD_HEADER FileRecord)
+NtfsDumpFileAttributes(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER FileRecord)
{
- PATTRIBUTE Attribute;
+ NTSTATUS Status;
+ FIND_ATTR_CONTXT Context;
+ PNTFS_ATTR_RECORD Attribute;
- Attribute = (PATTRIBUTE)((ULONG_PTR)FileRecord + FileRecord->AttributeOffset);
- while (Attribute < (PATTRIBUTE)((ULONG_PTR)FileRecord + FileRecord->BytesInUse) &&
- Attribute->AttributeType != (ATTRIBUTE_TYPE)-1)
+ Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
+ while (NT_SUCCESS(Status))
{
- NtfsDumpAttribute(Attribute);
+ NtfsDumpAttribute(Vcb, Attribute);
- Attribute = (PATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Length);
+ Status = FindNextAttribute(&Context, &Attribute);
}
+
+ FindCloseAttribute(&Context);
+}
+
+PFILENAME_ATTRIBUTE
+GetFileNameFromRecord(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER FileRecord,
+ UCHAR NameType)
+{
+ FIND_ATTR_CONTXT Context;
+ PNTFS_ATTR_RECORD Attribute;
+ PFILENAME_ATTRIBUTE Name;
+ NTSTATUS Status;
+
+ Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
+ while (NT_SUCCESS(Status))
+ {
+ if (Attribute->Type == AttributeFileName)
+ {
+ Name = (PFILENAME_ATTRIBUTE)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+ if (Name->NameType == NameType ||
+ (Name->NameType == NTFS_FILE_NAME_WIN32_AND_DOS && NameType == NTFS_FILE_NAME_WIN32) ||
+ (Name->NameType == NTFS_FILE_NAME_WIN32_AND_DOS && NameType == NTFS_FILE_NAME_DOS))
+ {
+ FindCloseAttribute(&Context);
+ return Name;
+ }
+ }
+
+ Status = FindNextAttribute(&Context, &Attribute);
+ }
+
+ FindCloseAttribute(&Context);
+ return NULL;
+}
+
+/**
+* GetPackedByteCount
+* Returns the minimum number of bytes needed to represent the value of a
+* 64-bit number. Used to encode data runs.
+*/
+UCHAR
+GetPackedByteCount(LONGLONG NumberToPack,
+ BOOLEAN IsSigned)
+{
+ int bytes = 0;
+ if (!IsSigned)
+ {
+ if (NumberToPack >= 0x0100000000000000)
+ return 8;
+ if (NumberToPack >= 0x0001000000000000)
+ return 7;
+ if (NumberToPack >= 0x0000010000000000)
+ return 6;
+ if (NumberToPack >= 0x0000000100000000)
+ return 5;
+ if (NumberToPack >= 0x0000000001000000)
+ return 4;
+ if (NumberToPack >= 0x0000000000010000)
+ return 3;
+ if (NumberToPack >= 0x0000000000000100)
+ return 2;
+ return 1;
+ }
+
+ if (NumberToPack > 0)
+ {
+ // we have to make sure the number that gets encoded won't be interpreted as negative
+ if (NumberToPack >= 0x0080000000000000)
+ return 8;
+ if (NumberToPack >= 0x0000800000000000)
+ return 7;
+ if (NumberToPack >= 0x0000008000000000)
+ return 6;
+ if (NumberToPack >= 0x0000000080000000)
+ return 5;
+ if (NumberToPack >= 0x0000000000800000)
+ return 4;
+ if (NumberToPack >= 0x0000000000008000)
+ return 3;
+ if (NumberToPack >= 0x0000000000000080)
+ return 2;
+ return 1;
+ }
+ else
+ {
+ // negative number
+ if (NumberToPack <= 0xff80000000000000)
+ return 8;
+ if (NumberToPack <= 0xffff800000000000)
+ return 7;
+ if (NumberToPack <= 0xffffff8000000000)
+ return 6;
+ if (NumberToPack <= 0xffffffff80000000)
+ return 5;
+ if (NumberToPack <= 0xffffffffff800000)
+ return 4;
+ if (NumberToPack <= 0xffffffffffff8000)
+ return 3;
+ if (NumberToPack <= 0xffffffffffffff80)
+ return 2;
+ return 1;
+ }
+ return bytes;
+}
+
+NTSTATUS
+GetLastClusterInDataRun(PDEVICE_EXTENSION Vcb, PNTFS_ATTR_RECORD Attribute, PULONGLONG LastCluster)
+{
+ LONGLONG DataRunOffset;
+ ULONGLONG DataRunLength;
+ LONGLONG DataRunStartLCN;
+
+ ULONGLONG LastLCN = 0;
+ PUCHAR DataRun = (PUCHAR)Attribute + Attribute->NonResident.MappingPairsOffset;
+
+ if (!Attribute->IsNonResident)
+ return STATUS_INVALID_PARAMETER;
+
+ while (1)
+ {
+ DataRun = DecodeRun(DataRun, &DataRunOffset, &DataRunLength);
+
+ if (DataRunOffset != -1)
+ {
+ // Normal data run.
+ DataRunStartLCN = LastLCN + DataRunOffset;
+ LastLCN = DataRunStartLCN;
+ *LastCluster = LastLCN + DataRunLength - 1;
+ }
+
+ if (*DataRun == 0)
+ break;
+ }
+
+ return STATUS_SUCCESS;
+}
+
+PSTANDARD_INFORMATION
+GetStandardInformationFromRecord(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER FileRecord)
+{
+ NTSTATUS Status;
+ FIND_ATTR_CONTXT Context;
+ PNTFS_ATTR_RECORD Attribute;
+ PSTANDARD_INFORMATION StdInfo;
+
+ Status = FindFirstAttribute(&Context, Vcb, FileRecord, FALSE, &Attribute);
+ while (NT_SUCCESS(Status))
+ {
+ if (Attribute->Type == AttributeStandardInformation)
+ {
+ StdInfo = (PSTANDARD_INFORMATION)((ULONG_PTR)Attribute + Attribute->Resident.ValueOffset);
+ FindCloseAttribute(&Context);
+ return StdInfo;
+ }
+
+ Status = FindNextAttribute(&Context, &Attribute);
+ }
+
+ FindCloseAttribute(&Context);
+ return NULL;
+}
+
+PFILENAME_ATTRIBUTE
+GetBestFileNameFromRecord(PDEVICE_EXTENSION Vcb,
+ PFILE_RECORD_HEADER FileRecord)
+{
+ PFILENAME_ATTRIBUTE FileName;
+
+ FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_POSIX);
+ if (FileName == NULL)
+ {
+ FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_WIN32);
+ if (FileName == NULL)
+ {
+ FileName = GetFileNameFromRecord(Vcb, FileRecord, NTFS_FILE_NAME_DOS);
+ }
+ }
+
+ return FileName;
}
/* EOF */
projects / reactos.git / blobdiff