+++ /dev/null
-/*
- * FreeLoader NTFS support
- * Copyright (C) 2004 Filip Navara <xnavara@volny.cz>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-/*
- * Limitations:
- * - No support for compressed files.
- * - No attribute list support.
- * - May crash on currupted filesystem.
- */
-
-#include <freeldr.h>
-#include <fs.h>
-#include <disk.h>
-#include <rtl.h>
-#include <arch.h>
-#include <mm.h>
-#include <debug.h>
-#include <cache.h>
-#include <machine.h>
-
-#include "ntfs.h"
-
-PNTFS_BOOTSECTOR NtfsBootSector;
-U32 NtfsClusterSize;
-U32 NtfsMftRecordSize;
-U32 NtfsIndexRecordSize;
-U32 NtfsDriveNumber;
-U32 NtfsSectorOfClusterZero;
-PNTFS_MFT_RECORD NtfsMasterFileTable;
-NTFS_ATTR_CONTEXT NtfsMFTContext;
-
-PUCHAR NtfsDecodeRun(PUCHAR DataRun, S64 *DataRunOffset, U64 *DataRunLength)
-{
- U8 DataRunOffsetSize;
- U8 DataRunLengthSize;
- S8 i;
-
- DataRunOffsetSize = (*DataRun >> 4) & 0xF;
- DataRunLengthSize = *DataRun & 0xF;
- *DataRunOffset = 0;
- *DataRunLength = 0;
- DataRun++;
- for (i = 0; i < DataRunLengthSize; i++)
- {
- *DataRunLength += *DataRun << (i << 3);
- DataRun++;
- }
-
- /* NTFS 3+ sparse files */
- if (DataRunOffsetSize == 0)
- {
- *DataRunOffset = -1;
- }
- else
- {
- for (i = 0; i < DataRunOffsetSize - 1; i++)
- {
- *DataRunOffset += *DataRun << (i << 3);
- DataRun++;
- }
- /* The last byte contains sign so we must process it different way. */
- *DataRunOffset = ((S8)(*(DataRun++)) << (i << 3)) + *DataRunOffset;
- }
-
- DbgPrint((DPRINT_FILESYSTEM, "DataRunOffsetSize: %x\n", DataRunOffsetSize));
- DbgPrint((DPRINT_FILESYSTEM, "DataRunLengthSize: %x\n", DataRunLengthSize));
- DbgPrint((DPRINT_FILESYSTEM, "DataRunOffset: %x\n", *DataRunOffset));
- DbgPrint((DPRINT_FILESYSTEM, "DataRunLength: %x\n", *DataRunLength));
-
- return DataRun;
-}
-
-/* FIXME: Add support for attribute lists! */
-BOOL NtfsFindAttribute(PNTFS_ATTR_CONTEXT Context, PNTFS_MFT_RECORD MftRecord, U32 Type, PWCHAR Name)
-{
- PNTFS_ATTR_RECORD AttrRecord;
- PNTFS_ATTR_RECORD AttrRecordEnd;
- U32 NameLength;
- PWCHAR AttrName;
-
- AttrRecord = (PNTFS_ATTR_RECORD)((PCHAR)MftRecord + MftRecord->AttributesOffset);
- AttrRecordEnd = (PNTFS_ATTR_RECORD)((PCHAR)MftRecord + NtfsMftRecordSize);
- for (NameLength = 0; Name[NameLength] != 0; NameLength++)
- ;
-
- while (AttrRecord < AttrRecordEnd)
- {
- if (AttrRecord->Type == NTFS_ATTR_TYPE_END)
- break;
-
- if (AttrRecord->Type == Type)
- {
- if (AttrRecord->NameLength == NameLength)
- {
- AttrName = (PWCHAR)((PCHAR)AttrRecord + AttrRecord->NameOffset);
- if (!RtlCompareMemory(AttrName, Name, NameLength << 1))
- {
- /* Found it, fill up the context and return. */
- Context->Record = AttrRecord;
- if (AttrRecord->IsNonResident)
- {
- S64 DataRunOffset;
- U64 DataRunLength;
-
- Context->CacheRun = (PUCHAR)Context->Record + Context->Record->NonResident.MappingPairsOffset;
- Context->CacheRunOffset = 0;
- Context->CacheRun = NtfsDecodeRun(Context->CacheRun, &DataRunOffset, &DataRunLength);
- Context->CacheRunLength = DataRunLength;
- if (DataRunOffset != -1)
- {
- /* Normal run. */
- Context->CacheRunStartLCN =
- Context->CacheRunLastLCN = DataRunOffset;
- }
- else
- {
- /* Sparse run. */
- Context->CacheRunStartLCN = -1;
- Context->CacheRunLastLCN = 0;
- }
- Context->CacheRunCurrentOffset = 0;
- }
- return TRUE;
- }
- }
- }
-
- AttrRecord = (PNTFS_ATTR_RECORD)((PCHAR)AttrRecord + AttrRecord->Length);
- }
-
- return FALSE;
-}
-
-/* FIXME: Optimize for multisector reads. */
-BOOL NtfsDiskRead(U64 Offset, U64 Length, PCHAR Buffer)
-{
- U16 ReadLength;
-
- DbgPrint((DPRINT_FILESYSTEM, "NtfsDiskRead - Offset: %I64d Length: %I64d\n", Offset, Length));
- RtlZeroMemory((PCHAR)DISKREADBUFFER, 0x1000);
-
- /* I. Read partial first sector if needed */
- if (Offset % NtfsBootSector->BytesPerSector)
- {
- if (!MachDiskReadLogicalSectors(NtfsDriveNumber, NtfsSectorOfClusterZero + (Offset / NtfsBootSector->BytesPerSector), 1, (PCHAR)DISKREADBUFFER))
- return FALSE;
- ReadLength = min(Length, NtfsBootSector->BytesPerSector - (Offset % NtfsBootSector->BytesPerSector));
- RtlCopyMemory(Buffer, (PCHAR)DISKREADBUFFER + (Offset % NtfsBootSector->BytesPerSector), ReadLength);
- Buffer += ReadLength;
- Length -= ReadLength;
- Offset += ReadLength;
- }
-
- /* II. Read all complete 64-sector blocks. */
- while (Length >= 64 * NtfsBootSector->BytesPerSector)
- {
- if (!MachDiskReadLogicalSectors(NtfsDriveNumber, NtfsSectorOfClusterZero + (Offset / NtfsBootSector->BytesPerSector), 64, (PCHAR)DISKREADBUFFER))
- return FALSE;
- RtlCopyMemory(Buffer, (PCHAR)DISKREADBUFFER, 64 * NtfsBootSector->BytesPerSector);
- Buffer += 64 * NtfsBootSector->BytesPerSector;
- Length -= 64 * NtfsBootSector->BytesPerSector;
- Offset += 64 * NtfsBootSector->BytesPerSector;
- }
-
- /* III. Read the rest of data */
- if (Length)
- {
- ReadLength = ((Length + NtfsBootSector->BytesPerSector - 1) / NtfsBootSector->BytesPerSector);
- if (!MachDiskReadLogicalSectors(NtfsDriveNumber, NtfsSectorOfClusterZero + (Offset / NtfsBootSector->BytesPerSector), ReadLength, (PCHAR)DISKREADBUFFER))
- return FALSE;
- RtlCopyMemory(Buffer, (PCHAR)DISKREADBUFFER, Length);
- }
-
- return TRUE;
-}
-
-U64 NtfsReadAttribute(PNTFS_ATTR_CONTEXT Context, U64 Offset, PCHAR Buffer, U64 Length)
-{
- U64 LastLCN;
- PUCHAR DataRun;
- S64 DataRunOffset;
- U64 DataRunLength;
- S64 DataRunStartLCN;
- U64 CurrentOffset;
- U64 ReadLength;
- U64 AlreadyRead;
-
- if (!Context->Record->IsNonResident)
- {
- if (Offset > Context->Record->Resident.ValueLength)
- return 0;
- if (Offset + Length > Context->Record->Resident.ValueLength)
- Length = Context->Record->Resident.ValueLength - Offset;
- RtlCopyMemory(Buffer, (PCHAR)Context->Record + Context->Record->Resident.ValueOffset + Offset, Length);
- return Length;
- }
-
- /*
- * Non-resident attribute
- */
-
- /*
- * I. Find the corresponding start data run.
- */
-
- if (Context->CacheRunOffset == Offset)
- {
- DataRun = Context->CacheRun;
- LastLCN = Context->CacheRunLastLCN;
- DataRunStartLCN = Context->CacheRunStartLCN;
- DataRunLength = Context->CacheRunLength;
- CurrentOffset = Context->CacheRunCurrentOffset;
- }
- else
- {
- LastLCN = 0;
- DataRun = (PUCHAR)Context->Record + Context->Record->NonResident.MappingPairsOffset;
- CurrentOffset = 0;
-
- while (1)
- {
- DataRun = NtfsDecodeRun(DataRun, &DataRunOffset, &DataRunLength);
- if (DataRunOffset != -1)
- {
- /* Normal data run. */
- DataRunStartLCN = LastLCN + DataRunOffset;
- LastLCN = DataRunStartLCN;
- }
- else
- {
- /* Sparse data run. */
- DataRunStartLCN = -1;
- }
-
- if (Offset >= CurrentOffset &&
- Offset < CurrentOffset + (DataRunLength * NtfsClusterSize))
- {
- break;
- }
-
- if (*DataRun == 0)
- {
- return 0;
- }
-
- CurrentOffset += DataRunLength * NtfsClusterSize;
- }
- }
-
- /*
- * II. Go through the run list and read the data
- */
-
- AlreadyRead = 0;
- while (Length > 0)
- {
- ReadLength = min(DataRunLength * NtfsClusterSize, Length);
- if (DataRunStartLCN == -1)
- RtlZeroMemory(Buffer, ReadLength);
- else if (!NtfsDiskRead(DataRunStartLCN * NtfsClusterSize + Offset - CurrentOffset, ReadLength, Buffer))
- break;
- Length -= ReadLength;
- Buffer += ReadLength;
- AlreadyRead += ReadLength;
-
- /* We finished this request, but there still data in this data run. */
- if (Length == 0 && ReadLength != DataRunLength * NtfsClusterSize)
- break;
-
- /*
- * Go to next run in the list.
- */
-
- if (*DataRun == 0)
- break;
- DataRun = NtfsDecodeRun(DataRun, &DataRunOffset, &DataRunLength);
- if (DataRunOffset != -1)
- {
- /* Normal data run. */
- DataRunStartLCN = LastLCN + DataRunOffset;
- LastLCN = DataRunStartLCN;
- }
- else
- {
- /* Sparse data run. */
- DataRunStartLCN = -1;
- }
- CurrentOffset += DataRunLength * NtfsClusterSize;
- }
-
- Context->CacheRun = DataRun;
- Context->CacheRunOffset = Offset + AlreadyRead;
- Context->CacheRunStartLCN = DataRunStartLCN;
- Context->CacheRunLength = DataRunLength;
- Context->CacheRunLastLCN = LastLCN;
- Context->CacheRunCurrentOffset = CurrentOffset;
-
- return AlreadyRead;
-}
-
-BOOL NtfsFixupRecord(PNTFS_RECORD Record)
-{
- U16 *USA;
- U16 USANumber;
- U16 USACount;
- U16 *Block;
-
- USA = (U16*)((PCHAR)Record + Record->USAOffset);
- USANumber = *(USA++);
- USACount = Record->USACount - 1; /* Exclude the USA Number. */
- Block = (U16*)((PCHAR)Record + NtfsBootSector->BytesPerSector - 2);
-
- while (USACount)
- {
- if (*Block != USANumber)
- return FALSE;
- *Block = *(USA++);
- Block = (U16*)((PCHAR)Block + NtfsBootSector->BytesPerSector);
- USACount--;
- }
-
- return TRUE;
-}
-
-BOOL NtfsReadMftRecord(U32 MFTIndex, PNTFS_MFT_RECORD Buffer)
-{
- U64 BytesRead;
-
- BytesRead = NtfsReadAttribute(&NtfsMFTContext, MFTIndex * NtfsMftRecordSize, (PCHAR)Buffer, NtfsMftRecordSize);
- if (BytesRead != NtfsMftRecordSize)
- return FALSE;
-
- /* Apply update sequence array fixups. */
- return NtfsFixupRecord((PNTFS_RECORD)Buffer);
-}
-
-#ifdef DEBUG
-VOID NtfsPrintFile(PNTFS_INDEX_ENTRY IndexEntry)
-{
- PWCHAR FileName;
- U8 FileNameLength;
- CHAR AnsiFileName[256];
- U8 i;
-
- FileName = IndexEntry->FileName.FileName;
- FileNameLength = IndexEntry->FileName.FileNameLength;
-
- for (i = 0; i < FileNameLength; i++)
- AnsiFileName[i] = FileName[i];
- AnsiFileName[i] = 0;
-
- DbgPrint((DPRINT_FILESYSTEM, "- %s (%x)\n", AnsiFileName, IndexEntry->Data.Directory.IndexedFile));
-}
-#endif
-
-BOOL NtfsCompareFileName(PCHAR FileName, PNTFS_INDEX_ENTRY IndexEntry)
-{
- PWCHAR EntryFileName;
- U8 EntryFileNameLength;
- U8 i;
-
- EntryFileName = IndexEntry->FileName.FileName;
- EntryFileNameLength = IndexEntry->FileName.FileNameLength;
-
-#ifdef DEBUG
- NtfsPrintFile(IndexEntry);
-#endif
-
- if (strlen(FileName) != EntryFileNameLength)
- return FALSE;
-
- /* Do case-sensitive compares for Posix file names. */
- if (IndexEntry->FileName.FileNameType == NTFS_FILE_NAME_POSIX)
- {
- for (i = 0; i < EntryFileNameLength; i++)
- if (EntryFileName[i] != FileName[i])
- return FALSE;
- }
- else
- {
- for (i = 0; i < EntryFileNameLength; i++)
- if (tolower(EntryFileName[i]) != tolower(FileName[i]))
- return FALSE;
- }
-
- return TRUE;
-}
-
-BOOL NtfsFindMftRecord(U32 MFTIndex, PCHAR FileName, U32 *OutMFTIndex)
-{
- PNTFS_MFT_RECORD MftRecord;
- U32 Magic;
- NTFS_ATTR_CONTEXT IndexRootCtx;
- NTFS_ATTR_CONTEXT IndexBitmapCtx;
- NTFS_ATTR_CONTEXT IndexAllocationCtx;
- PNTFS_INDEX_ROOT IndexRoot;
- U64 BitmapDataSize;
- U64 IndexAllocationSize;
- PCHAR BitmapData;
- PCHAR IndexRecord;
- PNTFS_INDEX_ENTRY IndexEntry, IndexEntryEnd;
- U32 RecordOffset;
- U32 IndexBlockSize;
-
- MftRecord = MmAllocateMemory(NtfsMftRecordSize);
- if (MftRecord == NULL)
- {
- return FALSE;
- }
-
- if (NtfsReadMftRecord(MFTIndex, MftRecord))
- {
- Magic = MftRecord->Magic;
-
- if (!NtfsFindAttribute(&IndexRootCtx, MftRecord, NTFS_ATTR_TYPE_INDEX_ROOT, L"$I30"))
- {
- MmFreeMemory(MftRecord);
- return FALSE;
- }
-
- IndexRecord = MmAllocateMemory(NtfsIndexRecordSize);
- if (IndexRecord == NULL)
- {
- MmFreeMemory(MftRecord);
- return FALSE;
- }
-
- NtfsReadAttribute(&IndexRootCtx, 0, IndexRecord, NtfsIndexRecordSize);
- IndexRoot = (PNTFS_INDEX_ROOT)IndexRecord;
- IndexEntry = (PNTFS_INDEX_ENTRY)((PCHAR)&IndexRoot->IndexHeader + IndexRoot->IndexHeader.EntriesOffset);
- /* Index root is always resident. */
- IndexEntryEnd = (PNTFS_INDEX_ENTRY)(IndexRecord + IndexRootCtx.Record->Resident.ValueLength);
-
- DbgPrint((DPRINT_FILESYSTEM, "NtfsIndexRecordSize: %x IndexBlockSize: %x\n", NtfsIndexRecordSize, IndexRoot->IndexBlockSize));
-
- while (IndexEntry < IndexEntryEnd &&
- !(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
- {
- if (NtfsCompareFileName(FileName, IndexEntry))
- {
- *OutMFTIndex = IndexEntry->Data.Directory.IndexedFile;
- MmFreeMemory(IndexRecord);
- MmFreeMemory(MftRecord);
- return TRUE;
- }
- IndexEntry = (PNTFS_INDEX_ENTRY)((PCHAR)IndexEntry + IndexEntry->Length);
- }
-
- if (IndexRoot->IndexHeader.Flags & NTFS_LARGE_INDEX)
- {
- DbgPrint((DPRINT_FILESYSTEM, "Large Index!\n"));
-
- IndexBlockSize = IndexRoot->IndexBlockSize;
-
- if (!NtfsFindAttribute(&IndexBitmapCtx, MftRecord, NTFS_ATTR_TYPE_BITMAP, L"$I30"))
- {
- DbgPrint((DPRINT_FILESYSTEM, "Corrupted filesystem!\n"));
- MmFreeMemory(MftRecord);
- return FALSE;
- }
- if (IndexBitmapCtx.Record->IsNonResident)
- BitmapDataSize = IndexBitmapCtx.Record->NonResident.DataSize;
- else
- BitmapDataSize = IndexBitmapCtx.Record->Resident.ValueLength;
- DbgPrint((DPRINT_FILESYSTEM, "BitmapDataSize: %x\n", BitmapDataSize));
- BitmapData = MmAllocateMemory(BitmapDataSize);
- if (BitmapData == NULL)
- {
- MmFreeMemory(IndexRecord);
- MmFreeMemory(MftRecord);
- return FALSE;
- }
- NtfsReadAttribute(&IndexBitmapCtx, 0, BitmapData, BitmapDataSize);
-
- if (!NtfsFindAttribute(&IndexAllocationCtx, MftRecord, NTFS_ATTR_TYPE_INDEX_ALLOCATION, L"$I30"))
- {
- DbgPrint((DPRINT_FILESYSTEM, "Corrupted filesystem!\n"));
- MmFreeMemory(BitmapData);
- MmFreeMemory(IndexRecord);
- MmFreeMemory(MftRecord);
- return FALSE;
- }
- if (IndexAllocationCtx.Record->IsNonResident)
- IndexAllocationSize = IndexAllocationCtx.Record->NonResident.DataSize;
- else
- IndexAllocationSize = IndexAllocationCtx.Record->Resident.ValueLength;
-
- RecordOffset = 0;
-
- for (;;)
- {
- DbgPrint((DPRINT_FILESYSTEM, "RecordOffset: %x IndexAllocationSize: %x\n", RecordOffset, IndexAllocationSize));
- for (; RecordOffset < IndexAllocationSize;)
- {
- U8 Bit = 1 << ((RecordOffset / IndexBlockSize) & 7);
- U32 Byte = (RecordOffset / IndexBlockSize) >> 3;
- if ((BitmapData[Byte] & Bit))
- break;
- RecordOffset += IndexBlockSize;
- }
-
- if (RecordOffset >= IndexAllocationSize)
- {
- break;
- }
-
- NtfsReadAttribute(&IndexAllocationCtx, RecordOffset, IndexRecord, IndexBlockSize);
-
- if (!NtfsFixupRecord((PNTFS_RECORD)IndexRecord))
- {
- break;
- }
-
- /* FIXME */
- IndexEntry = (PNTFS_INDEX_ENTRY)(IndexRecord + 0x18 + *(U16 *)(IndexRecord + 0x18));
- IndexEntryEnd = (PNTFS_INDEX_ENTRY)(IndexRecord + IndexBlockSize);
-
- while (IndexEntry < IndexEntryEnd &&
- !(IndexEntry->Flags & NTFS_INDEX_ENTRY_END))
- {
- if (NtfsCompareFileName(FileName, IndexEntry))
- {
- DbgPrint((DPRINT_FILESYSTEM, "File found\n"));
- *OutMFTIndex = IndexEntry->Data.Directory.IndexedFile;
- MmFreeMemory(BitmapData);
- MmFreeMemory(IndexRecord);
- MmFreeMemory(MftRecord);
- return TRUE;
- }
- IndexEntry = (PNTFS_INDEX_ENTRY)((PCHAR)IndexEntry + IndexEntry->Length);
- }
-
- RecordOffset += IndexBlockSize;
- }
-
- MmFreeMemory(BitmapData);
- }
-
- MmFreeMemory(IndexRecord);
- }
- else
- {
- DbgPrint((DPRINT_FILESYSTEM, "Can't read MFT record\n"));
- }
- MmFreeMemory(MftRecord);
-
- return FALSE;
-}
-
-BOOL NtfsLookupFile(PUCHAR FileName, PNTFS_MFT_RECORD MftRecord, PNTFS_ATTR_CONTEXT DataContext)
-{
- U32 NumberOfPathParts;
- UCHAR PathPart[261];
- U32 CurrentMFTIndex;
- U8 i;
-
- DbgPrint((DPRINT_FILESYSTEM, "NtfsLookupFile() FileName = %s\n", FileName));
-
- CurrentMFTIndex = NTFS_FILE_ROOT;
- NumberOfPathParts = FsGetNumPathParts(FileName);
- for (i = 0; i < NumberOfPathParts; i++)
- {
- FsGetFirstNameFromPath(PathPart, FileName);
-
- for (; (*FileName != '\\') && (*FileName != '/') && (*FileName != '\0'); FileName++)
- ;
- FileName++;
-
- DbgPrint((DPRINT_FILESYSTEM, "- Lookup: %s\n", PathPart));
- if (!NtfsFindMftRecord(CurrentMFTIndex, PathPart, &CurrentMFTIndex))
- {
- DbgPrint((DPRINT_FILESYSTEM, "- Failed\n"));
- return FALSE;
- }
- DbgPrint((DPRINT_FILESYSTEM, "- Lookup: %x\n", CurrentMFTIndex));
- }
-
- if (!NtfsReadMftRecord(CurrentMFTIndex, MftRecord))
- {
- DbgPrint((DPRINT_FILESYSTEM, "NtfsLookupFile: Can't read MFT record\n"));
- return FALSE;
- }
-
- if (!NtfsFindAttribute(DataContext, MftRecord, NTFS_ATTR_TYPE_DATA, L""))
- {
- DbgPrint((DPRINT_FILESYSTEM, "NtfsLookupFile: Can't find data attribute\n"));
- return FALSE;
- }
-
- return TRUE;
-}
-
-BOOL NtfsOpenVolume(U32 DriveNumber, U32 VolumeStartSector)
-{
- NtfsBootSector = (PNTFS_BOOTSECTOR)DISKREADBUFFER;
-
- DbgPrint((DPRINT_FILESYSTEM, "NtfsOpenVolume() DriveNumber = 0x%x VolumeStartSector = 0x%x\n", DriveNumber, VolumeStartSector));
-
- if (!MachDiskReadLogicalSectors(DriveNumber, VolumeStartSector, 1, (PCHAR)DISKREADBUFFER))
- {
- FileSystemError("Failed to read the boot sector.");
- return FALSE;
- }
-
- if (RtlCompareMemory(NtfsBootSector->SystemId, "NTFS", 4))
- {
- FileSystemError("Invalid NTFS signature.");
- return FALSE;
- }
-
- NtfsBootSector = MmAllocateMemory(NtfsBootSector->BytesPerSector);
- if (NtfsBootSector == NULL)
- {
- return FALSE;
- }
-
- RtlCopyMemory(NtfsBootSector, (PCHAR)DISKREADBUFFER, ((PNTFS_BOOTSECTOR)DISKREADBUFFER)->BytesPerSector);
-
- NtfsClusterSize = NtfsBootSector->SectorsPerCluster * NtfsBootSector->BytesPerSector;
- if (NtfsBootSector->ClustersPerMftRecord > 0)
- NtfsMftRecordSize = NtfsBootSector->ClustersPerMftRecord * NtfsClusterSize;
- else
- NtfsMftRecordSize = 1 << (-NtfsBootSector->ClustersPerMftRecord);
- if (NtfsBootSector->ClustersPerIndexRecord > 0)
- NtfsIndexRecordSize = NtfsBootSector->ClustersPerIndexRecord * NtfsClusterSize;
- else
- NtfsIndexRecordSize = 1 << (-NtfsBootSector->ClustersPerIndexRecord);
-
- DbgPrint((DPRINT_FILESYSTEM, "NtfsClusterSize: 0x%x\n", NtfsClusterSize));
- DbgPrint((DPRINT_FILESYSTEM, "ClustersPerMftRecord: %d\n", NtfsBootSector->ClustersPerMftRecord));
- DbgPrint((DPRINT_FILESYSTEM, "ClustersPerIndexRecord: %d\n", NtfsBootSector->ClustersPerIndexRecord));
- DbgPrint((DPRINT_FILESYSTEM, "NtfsMftRecordSize: 0x%x\n", NtfsMftRecordSize));
- DbgPrint((DPRINT_FILESYSTEM, "NtfsIndexRecordSize: 0x%x\n", NtfsIndexRecordSize));
-
- NtfsDriveNumber = DriveNumber;
- NtfsSectorOfClusterZero = VolumeStartSector;
-
- DbgPrint((DPRINT_FILESYSTEM, "Reading MFT index...\n"));
- if (!MachDiskReadLogicalSectors(DriveNumber,
- NtfsSectorOfClusterZero +
- (NtfsBootSector->MftLocation * NtfsBootSector->SectorsPerCluster),
- NtfsMftRecordSize / NtfsBootSector->BytesPerSector, (PCHAR)DISKREADBUFFER))
- {
- FileSystemError("Failed to read the Master File Table record.");
- return FALSE;
- }
-
- NtfsMasterFileTable = MmAllocateMemory(NtfsMftRecordSize);
- if (NtfsMasterFileTable == NULL)
- {
- MmFreeMemory(NtfsBootSector);
- return FALSE;
- }
-
- RtlCopyMemory(NtfsMasterFileTable, (PCHAR)DISKREADBUFFER, NtfsMftRecordSize);
-
- DbgPrint((DPRINT_FILESYSTEM, "Searching for DATA attribute...\n"));
- if (!NtfsFindAttribute(&NtfsMFTContext, NtfsMasterFileTable, NTFS_ATTR_TYPE_DATA, L""))
- {
- FileSystemError("Can't find data attribute for Master File Table.");
- return FALSE;
- }
-
- return TRUE;
-}
-
-FILE* NtfsOpenFile(PUCHAR FileName)
-{
- PNTFS_FILE_HANDLE FileHandle;
- PNTFS_MFT_RECORD MftRecord;
-
- FileHandle = MmAllocateMemory(sizeof(NTFS_FILE_HANDLE) + NtfsMftRecordSize);
- if (FileHandle == NULL)
- {
- return NULL;
- }
-
- MftRecord = (PNTFS_MFT_RECORD)(FileHandle + 1);
- if (!NtfsLookupFile(FileName, MftRecord, &FileHandle->DataContext))
- {
- MmFreeMemory(FileHandle);
- return NULL;
- }
-
- FileHandle->Offset = 0;
-
- return (FILE*)FileHandle;
-}
-
-BOOL NtfsReadFile(FILE *File, U32 BytesToRead, U32* BytesRead, PVOID Buffer)
-{
- PNTFS_FILE_HANDLE FileHandle = (PNTFS_FILE_HANDLE)File;
- U64 BytesRead64;
- BytesRead64 = NtfsReadAttribute(&FileHandle->DataContext, FileHandle->Offset, Buffer, BytesToRead);
- if (BytesRead64)
- {
- *BytesRead = (U32)BytesRead64;
- FileHandle->Offset += BytesRead64;
- return TRUE;
- }
- return FALSE;
-}
-
-U32 NtfsGetFileSize(FILE *File)
-{
- PNTFS_FILE_HANDLE FileHandle = (PNTFS_FILE_HANDLE)File;
- if (FileHandle->DataContext.Record->IsNonResident)
- return (U32)FileHandle->DataContext.Record->NonResident.DataSize;
- else
- return (U32)FileHandle->DataContext.Record->Resident.ValueLength;
-}
-
-VOID NtfsSetFilePointer(FILE *File, U32 NewFilePointer)
-{
- PNTFS_FILE_HANDLE FileHandle = (PNTFS_FILE_HANDLE)File;
- FileHandle->Offset = NewFilePointer;
-}
-
-U32 NtfsGetFilePointer(FILE *File)
-{
- PNTFS_FILE_HANDLE FileHandle = (PNTFS_FILE_HANDLE)File;
- return FileHandle->Offset;
-}
projects / reactos.git / blobdiff