private void LoadDirectories(FileStream isoStream)
{
MicrosoftExFatDirectoryStructure rootDirectory;
byte[] primaryEntry = new byte[MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE];
byte entryType = 0xFF;
long currentOffset = (long)this.RootDirectoryAbsoluteOffset;
ulong maxDirectoryLength;
bool rootDirectoryProcessed = false;
// @TODO: Updated to use max data size and to jump clusters if needed.
do
{
// 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:
// calculate max size for root directory entries
maxDirectoryLength = this.GetMaxDataSizeForFirstCluster(this.RootDirectoryFirstCluster);
// build root directory
rootDirectory = new MicrosoftExFatDirectoryStructure(isoStream, this.VolumeBaseOffset, (long)this.RootDirectoryAbsoluteOffset, (long)maxDirectoryLength,
String.Empty, String.Empty, this.ClusterHeapAbsoluteOffset, this.ClusterSizeInBytes);
// add root directory
this.DirectoryStructureArray.Add(rootDirectory);
// skip the root directory entries, primaryEntry[1] is the FileDirectoryEntry.SecondaryCount value
currentOffset += MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE +
(uint)(MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_SIZE * primaryEntry[1]);
// set flag to indicate directory was processed
rootDirectoryProcessed = true;
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)
}while ((!rootDirectoryProcessed) && (entryType != MicrosoftExFatFileSystem.ROOT_DIR_ENTRY_EMPTY)); // @todo: add max size?
}
public int CompareTo(object obj)
{
if (obj is MicrosoftExFatDirectoryStructure)
{
MicrosoftExFatDirectoryStructure o = (MicrosoftExFatDirectoryStructure)obj;
return(this.DirectoryName.CompareTo(o.DirectoryName));
}
throw new ArgumentException("object is not an MicrosoftExFatDirectoryStructure");
}
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)
}
}