public void Initialize(FileStream isoStream, long offset, bool isRawDump)
{
this.VolumeBaseOffset = offset;
this.IsRawDump = isRawDump;
this.VolumeType = VolumeDataType.Data;
this.DirectoryStructureArray = new ArrayList();
this.FormatDescription = MicrosoftExFatFileSystem.FORMAT_DESCRIPTION_STRING;
this.JumpBoot = ParseFile.ReadUint24LE(isoStream, this.VolumeBaseOffset + 0);
this.MagicBytes = ParseFile.ParseSimpleOffset(isoStream, this.VolumeBaseOffset + 3, 8);
this.ZeroChunk = ParseFile.ParseSimpleOffset(isoStream, this.VolumeBaseOffset + 11, 53);
this.PartitionOffset = ParseFile.ReadUlongLE(isoStream, this.VolumeBaseOffset + 64);
this.VolumeLength = ParseFile.ReadUlongLE(isoStream, this.VolumeBaseOffset + 72);
this.FatOffset = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 80);
this.FatLength = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 84);
this.ClusterHeapOffset = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 88);
this.ClusterCount = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 92);
this.RootDirectoryFirstCluster = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 96);
this.VolumeSerialNumber = ParseFile.ReadUintLE(isoStream, this.VolumeBaseOffset + 100);
this.VolumeIdentifier = this.VolumeSerialNumber.ToString("X2");
this.FileSystemRevision = ParseFile.ReadUshortLE(isoStream, this.VolumeBaseOffset + 104);
this.VolumeFlags = ParseFile.ReadUshortLE(isoStream, this.VolumeBaseOffset + 106);
this.BytesPerSector = ParseFile.ReadByte(isoStream, this.VolumeBaseOffset + 108);
this.SectorsPerCluster = ParseFile.ReadByte(isoStream, this.VolumeBaseOffset + 109);
this.NumberOfFats = ParseFile.ReadByte(isoStream, this.VolumeBaseOffset + 110);
// caclulate helper values
this.SectorSizeInBytes = (uint)(1 << this.BytesPerSector);
this.ClusterSizeInBytes = (uint)(1 << (this.SectorsPerCluster + this.BytesPerSector));
this.VolumeLengthInBytes = this.VolumeLength * this.SectorSizeInBytes;
this.FatAbsoluteOffset = (ulong)this.VolumeBaseOffset + (this.FatOffset * this.SectorSizeInBytes);
this.FatLengthInBytes = this.FatLength * this.SectorSizeInBytes;
this.ClusterHeapAbsoluteOffset = (ulong)this.VolumeBaseOffset + (this.ClusterHeapOffset * this.SectorSizeInBytes);
this.RootDirectoryAbsoluteOffset =
MicrosoftExFatFileSystem.GetOffsetForClusterId(this.ClusterHeapAbsoluteOffset, this.ClusterSizeInBytes, this.RootDirectoryFirstCluster); // this.ClusterHeapAbsoluteOffset + ((this.RootDirectoryFirstCluster - MicrosoftExFatFileSystem.CLUSTER_CORRECTION_OFFSET) * this.ClusterSizeInBytes);
if (this.FileSystemRevision == MicrosoftExFatFileSystem.EXFAT_VERSION_0100)
{
// initialize FAT
this.InitializeAndValidateFat(isoStream);
// process root directory entry
this.GetVolumeLabel(isoStream);
// load directories
this.LoadDirectories(isoStream);
}
else
{
MessageBox.Show(String.Format("Unsupported exFAT version: {0}", this.FileSystemRevision.ToString("X8")));
}
}
private void processDirectory(
FileStream isoStream,
long directoryOffset,
long maxDirectoryLength,
string parentDirectory,
long volumeBaseOffset,
ulong clusterHeapOffset,
uint clusterSize)
{
byte[] primaryEntry;
byte[] secondaryRecord;
byte entryType = 0xFF;
MicrosoftExFatFileStructure newFile;
MicrosoftExFatDirectoryStructure newDirectory;
ulong objectOffset;
MicrosoftExFatRootDirFileDirectoryEntry fileEntry; // = new MicrosoftExFatRootDirFileDirectoryEntry(fileDirectoryEntry);
MicrosoftExFatRootDirStreamExtensionEntry streamExtensionEntry;
MicrosoftExFatRootDirFileNameExtensionEntry fileNameExtensionEntry;
string fileName = String.Empty;
DateTime fileDate = new DateTime(); // @todo update to actually parse date
long currentOffset = directoryOffset;
long maxOffset = directoryOffset + maxDirectoryLength;
// @TODO: need to handle when in non-contiguous clusters
while ((currentOffset < maxOffset) && (entryType != MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_EMPTY))
{
// read primary entry
primaryEntry = ParseFile.ParseSimpleOffset(isoStream, currentOffset, MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE);
// process primary entry and subentries if needed
entryType = primaryEntry[0];
switch (entryType)
{
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_FILE_DIRECTORY:
fileEntry = new MicrosoftExFatRootDirFileDirectoryEntry(primaryEntry);
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE;
// check if in use and process, and skip if not
if (fileEntry.IsInUse)
{
// process Stream Extension Entry
secondaryRecord = ParseFile.ParseSimpleOffset(isoStream, currentOffset, MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE);
streamExtensionEntry = new MicrosoftExFatRootDirStreamExtensionEntry(secondaryRecord);
objectOffset = MicrosoftExFatFileSystem.GetOffsetForClusterId(clusterHeapOffset, clusterSize, streamExtensionEntry.FirstCluster);
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE;
// process File Name Extention Entry
fileName = String.Empty;
for (int i = 0; i < (fileEntry.SecondaryCount - 1); i++)
{
secondaryRecord = ParseFile.ParseSimpleOffset(isoStream, (currentOffset), MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE);
fileNameExtensionEntry = new MicrosoftExFatRootDirFileNameExtensionEntry(secondaryRecord);
// build name from chunks
fileName += fileNameExtensionEntry.FileNameChunk;
// move pointer
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE;
}
// trim any excess from name
fileName = fileName.Substring(0, streamExtensionEntry.NameLength);
// create dir or file and add to array list
if (fileEntry.IsDirectory)
{
// get new directory
newDirectory = new MicrosoftExFatDirectoryStructure(isoStream, volumeBaseOffset,
(long)objectOffset, (long)streamExtensionEntry.DataLength,
fileName, parentDirectory, clusterHeapOffset, clusterSize);
// add directory to subdirectory array
this.SubDirectoryArray.Add(newDirectory);
}
else // file
{
newFile = new MicrosoftExFatFileStructure(parentDirectory, isoStream.Name, fileName, (long)objectOffset,
volumeBaseOffset, streamExtensionEntry.FirstCluster, (long)streamExtensionEntry.DataLength, fileDate);
this.FileArray.Add(newFile);
}
}
else
{
currentOffset = (uint)(MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE * fileEntry.SecondaryCount);
}
break;
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_VOLUME_LABEL:
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_ALLOCATION_BITMAP:
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_UPCASE:
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_VOLUME_GUID:
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_TEXFAT_PADDING:
case MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_TYPE_WINDOWS_CE_ACL:
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE;
break;
default:
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE;
break;
} // switch (entryType)
}
}
