public static int ReadFrom(byte[] src, int offset, Encoding enc, out DirectoryRecord record)
{
int length = src[offset + 0];
record = new DirectoryRecord();
record.ExtendedAttributeRecordLength = src[offset + 1];
record.LocationOfExtent = IsoUtilities.ToUInt32FromBoth(src, offset + 2);
record.DataLength = IsoUtilities.ToUInt32FromBoth(src, offset + 10);
record.RecordingDateAndTime = IsoUtilities.ToUTCDateTimeFromDirectoryTime(src, offset + 18);
record.Flags = (FileFlags)src[offset + 25];
record.FileUnitSize = src[offset + 26];
record.InterleaveGapSize = src[offset + 27];
record.VolumeSequenceNumber = IsoUtilities.ToUInt16FromBoth(src, offset + 28);
byte lengthOfFileIdentifier = src[offset + 32];
record.FileIdentifier = IsoUtilities.ReadChars(src, offset + 33, lengthOfFileIdentifier, enc);
int padding = (lengthOfFileIdentifier & 1) == 0 ? 1 : 0;
int startSystemArea = lengthOfFileIdentifier + padding + 33;
int lenSystemArea = length - startSystemArea;
if (lenSystemArea > 0)
{
record.SystemUseData = new byte[lenSystemArea];
Array.Copy(src, offset + startSystemArea, record.SystemUseData, 0, lenSystemArea);
}
return(length);
}
public static int ReadFrom(byte[] src, int offset, Encoding enc, out DirectoryRecord record)
{
int length = src[offset + 0];
record = new DirectoryRecord();
record.ExtendedAttributeRecordLength = src[offset + 1];
record.LocationOfExtent = IsoUtilities.ToUInt32FromBoth(src, offset + 2);
record.DataLength = IsoUtilities.ToUInt32FromBoth(src, offset + 10);
record.RecordingDateAndTime = IsoUtilities.ToUTCDateTimeFromDirectoryTime(src, offset + 18);
record.Flags = (FileFlags)src[offset + 25];
record.FileUnitSize = src[offset + 26];
record.InterleaveGapSize = src[offset + 27];
record.VolumeSequenceNumber = IsoUtilities.ToUInt16FromBoth(src, offset + 28);
byte lengthOfFileIdentifier = src[offset + 32];
record.FileIdentifier = IsoUtilities.ReadChars(src, offset + 33, lengthOfFileIdentifier, enc);
int padding = (lengthOfFileIdentifier & 1) == 0 ? 1 : 0;
int startSystemArea = lengthOfFileIdentifier + padding + 33;
int lenSystemArea = length - startSystemArea;
if (lenSystemArea > 0)
{
record.SystemUseData = new byte[lenSystemArea];
Array.Copy(src, offset + startSystemArea, record.SystemUseData, 0, lenSystemArea);
}
return length;
}
public CommonVolumeDescriptor(byte[] src, int offset, Encoding enc)
: base(src, offset)
{
CharacterEncoding = enc;
SystemIdentifier = IsoUtilities.ReadChars(src, offset + 8, 32, CharacterEncoding);
VolumeIdentifier = IsoUtilities.ReadChars(src, offset + 40, 32, CharacterEncoding);
VolumeSpaceSize = IsoUtilities.ToUInt32FromBoth(src, offset + 80);
VolumeSetSize = IsoUtilities.ToUInt16FromBoth(src, offset + 120);
VolumeSequenceNumber = IsoUtilities.ToUInt16FromBoth(src, offset + 124);
LogicalBlockSize = IsoUtilities.ToUInt16FromBoth(src, offset + 128);
PathTableSize = IsoUtilities.ToUInt32FromBoth(src, offset + 132);
TypeLPathTableLocation = Utilities.ToUInt32LittleEndian(src, offset + 140);
OptionalTypeLPathTableLocation = Utilities.ToUInt32LittleEndian(src, offset + 144);
TypeMPathTableLocation = Utilities.BitSwap(Utilities.ToUInt32LittleEndian(src, offset + 148));
OptionalTypeMPathTableLocation = Utilities.BitSwap(Utilities.ToUInt32LittleEndian(src, offset + 152));
DirectoryRecord.ReadFrom(src, offset + 156, CharacterEncoding, out RootDirectory);
VolumeSetIdentifier = IsoUtilities.ReadChars(src, offset + 190, 318 - 190, CharacterEncoding);
PublisherIdentifier = IsoUtilities.ReadChars(src, offset + 318, 446 - 318, CharacterEncoding);
DataPreparerIdentifier = IsoUtilities.ReadChars(src, offset + 446, 574 - 446, CharacterEncoding);
ApplicationIdentifier = IsoUtilities.ReadChars(src, offset + 574, 702 - 574, CharacterEncoding);
CopyrightFileIdentifier = IsoUtilities.ReadChars(src, offset + 702, 739 - 702, CharacterEncoding);
AbstractFileIdentifier = IsoUtilities.ReadChars(src, offset + 739, 776 - 739, CharacterEncoding);
BibliographicFileIdentifier = IsoUtilities.ReadChars(src, offset + 776, 813 - 776, CharacterEncoding);
CreationDateAndTime = IsoUtilities.ToDateTimeFromVolumeDescriptorTime(src, offset + 813);
ModificationDateAndTime = IsoUtilities.ToDateTimeFromVolumeDescriptorTime(src, offset + 830);
ExpirationDateAndTime = IsoUtilities.ToDateTimeFromVolumeDescriptorTime(src, offset + 847);
EffectiveDateAndTime = IsoUtilities.ToDateTimeFromVolumeDescriptorTime(src, offset + 864);
FileStructureVersion = src[offset + 881];
}
private static DirectoryRecord ReadRootSelfRecord(IsoContext context)
{
context.DataStream.Position = context.VolumeDescriptor.RootDirectory.LocationOfExtent * context.VolumeDescriptor.LogicalBlockSize;
byte[] firstSector = Utilities.ReadFully(context.DataStream, context.VolumeDescriptor.LogicalBlockSize);
DirectoryRecord rootSelfRecord;
DirectoryRecord.ReadFrom(firstSector, 0, context.VolumeDescriptor.CharacterEncoding, out rootSelfRecord);
return(rootSelfRecord);
}
private static void InitializeSusp(IsoContext context, DirectoryRecord rootSelfRecord)
{
// Stage 1 - SUSP present?
List <SuspExtension> extensions = new List <SuspExtension>();
if (!SuspRecords.DetectSharingProtocol(rootSelfRecord.SystemUseData, 0))
{
context.SuspExtensions = new List <SuspExtension>();
context.SuspDetected = false;
return;
}
else
{
context.SuspDetected = true;
}
SuspRecords suspRecords = new SuspRecords(context, rootSelfRecord.SystemUseData, 0);
// Stage 2 - Init general SUSP params
SharingProtocolSystemUseEntry spEntry = (SharingProtocolSystemUseEntry)suspRecords.GetEntries(null, "SP")[0];
context.SuspSkipBytes = spEntry.SystemAreaSkip;
// Stage 3 - Init extensions
List <SystemUseEntry> extensionEntries = suspRecords.GetEntries(null, "ER");
if (extensionEntries != null)
{
foreach (ExtensionSystemUseEntry extension in extensionEntries)
{
switch (extension.ExtensionIdentifier)
{
case "RRIP_1991A":
case "IEEE_P1282":
case "IEEE_1282":
extensions.Add(new RockRidgeExtension(extension.ExtensionIdentifier));
context.RockRidgeIdentifier = extension.ExtensionIdentifier;
break;
default:
extensions.Add(new GenericSuspExtension(extension.ExtensionIdentifier));
break;
}
}
}
else if (suspRecords.GetEntries(null, "RR") != null)
{
// Some ISO creators don't add the 'ER' record for RockRidge, but write the (legacy)
// RR record anyway
extensions.Add(new RockRidgeExtension("RRIP_1991A"));
context.RockRidgeIdentifier = "RRIP_1991A";
}
context.SuspExtensions = extensions;
}
private static int WriteMember(BuildDirectoryMember m, string nameOverride, Encoding nameEnc, byte[] buffer, int offset, Dictionary <BuildDirectoryMember, uint> locationTable, Encoding dataEnc)
{
DirectoryRecord dr = new DirectoryRecord();
dr.FileIdentifier = m.PickName(nameOverride, nameEnc);
dr.LocationOfExtent = locationTable[m];
dr.DataLength = (uint)m.GetDataSize(dataEnc);
dr.RecordingDateAndTime = m.CreationTime;
dr.Flags = (m is BuildDirectoryInfo) ? FileFlags.Directory : FileFlags.None;
return(dr.WriteTo(buffer, offset, nameEnc));
}
public ReaderDirectory(IsoContext context, ReaderDirEntry dirEntry)
: base(context, dirEntry)
{
byte[] buffer = new byte[IsoUtilities.SectorSize];
Stream extent = new ExtentStream(_context.DataStream, dirEntry.Record.LocationOfExtent, uint.MaxValue, 0, 0);
_records = new List <ReaderDirEntry>();
uint totalLength = dirEntry.Record.DataLength;
uint totalRead = 0;
while (totalRead < totalLength)
{
int toRead = (int)Math.Min(buffer.Length, totalLength - totalRead);
uint bytesRead = (uint)Utilities.ReadFully(extent, buffer, 0, toRead);
if (bytesRead != toRead)
{
throw new IOException("Failed to read whole directory");
}
totalRead += (uint)bytesRead;
uint pos = 0;
while (pos < bytesRead && buffer[pos] != 0)
{
DirectoryRecord dr;
uint length = (uint)DirectoryRecord.ReadFrom(buffer, (int)pos, context.VolumeDescriptor.CharacterEncoding, out dr);
if (!IsoUtilities.IsSpecialDirectory(dr))
{
ReaderDirEntry childDirEntry = new ReaderDirEntry(_context, dr);
if (context.SuspDetected && !string.IsNullOrEmpty(context.RockRidgeIdentifier))
{
if (childDirEntry.SuspRecords == null || !childDirEntry.SuspRecords.HasEntry(context.RockRidgeIdentifier, "RE"))
{
_records.Add(childDirEntry);
}
}
else
{
_records.Add(childDirEntry);
}
}
else if (dr.FileIdentifier == "\0")
{
_self = new ReaderDirEntry(_context, dr);
}
pos += length;
}
}
}
public CommonVolumeDescriptor(
VolumeDescriptorType type,
byte version,
uint volumeSpaceSize,
uint pathTableSize,
uint typeLPathTableLocation,
uint typeMPathTableLocation,
uint rootDirExtentLocation,
uint rootDirDataLength,
DateTime buildTime,
Encoding enc)
: base(type, version)
{
CharacterEncoding = enc;
SystemIdentifier = string.Empty;
VolumeIdentifier = string.Empty;
VolumeSpaceSize = volumeSpaceSize;
VolumeSetSize = 1;
VolumeSequenceNumber = 1;
LogicalBlockSize = IsoUtilities.SectorSize;
PathTableSize = pathTableSize;
TypeLPathTableLocation = typeLPathTableLocation;
////OptionalTypeLPathTableLocation = 0;
TypeMPathTableLocation = typeMPathTableLocation;
////OptionalTypeMPathTableLocation = 0;
RootDirectory = new DirectoryRecord();
RootDirectory.ExtendedAttributeRecordLength = 0;
RootDirectory.LocationOfExtent = rootDirExtentLocation;
RootDirectory.DataLength = rootDirDataLength;
RootDirectory.RecordingDateAndTime = buildTime;
RootDirectory.Flags = FileFlags.Directory;
RootDirectory.FileUnitSize = 0;
RootDirectory.InterleaveGapSize = 0;
RootDirectory.VolumeSequenceNumber = 1;
RootDirectory.FileIdentifier = "\0";
VolumeSetIdentifier = string.Empty;
PublisherIdentifier = string.Empty;
DataPreparerIdentifier = string.Empty;
ApplicationIdentifier = string.Empty;
CopyrightFileIdentifier = string.Empty;
AbstractFileIdentifier = string.Empty;
BibliographicFileIdentifier = string.Empty;
CreationDateAndTime = buildTime;
ModificationDateAndTime = buildTime;
ExpirationDateAndTime = DateTime.MinValue;
EffectiveDateAndTime = buildTime;
FileStructureVersion = 1; // V1
}
internal uint GetDirectoryRecordSize(Encoding enc)
{
return(DirectoryRecord.CalcLength(PickName(null, enc), enc));
}
public CommonVolumeDescriptor(
VolumeDescriptorType type,
byte version,
uint volumeSpaceSize,
uint pathTableSize,
uint typeLPathTableLocation,
uint typeMPathTableLocation,
uint rootDirExtentLocation,
uint rootDirDataLength,
DateTime buildTime,
Encoding enc)
: base(type, version)
{
CharacterEncoding = enc;
SystemIdentifier = string.Empty;
VolumeIdentifier = string.Empty;
VolumeSpaceSize = volumeSpaceSize;
VolumeSetSize = 1;
VolumeSequenceNumber = 1;
LogicalBlockSize = IsoUtilities.SectorSize;
PathTableSize = pathTableSize;
TypeLPathTableLocation = typeLPathTableLocation;
////OptionalTypeLPathTableLocation = 0;
TypeMPathTableLocation = typeMPathTableLocation;
////OptionalTypeMPathTableLocation = 0;
RootDirectory = new DirectoryRecord();
RootDirectory.ExtendedAttributeRecordLength = 0;
RootDirectory.LocationOfExtent = rootDirExtentLocation;
RootDirectory.DataLength = rootDirDataLength;
RootDirectory.RecordingDateAndTime = buildTime;
RootDirectory.Flags = FileFlags.Directory;
RootDirectory.FileUnitSize = 0;
RootDirectory.InterleaveGapSize = 0;
RootDirectory.VolumeSequenceNumber = 1;
RootDirectory.FileIdentifier = "\0";
VolumeSetIdentifier = string.Empty;
PublisherIdentifier = string.Empty;
DataPreparerIdentifier = string.Empty;
ApplicationIdentifier = string.Empty;
CopyrightFileIdentifier = string.Empty;
AbstractFileIdentifier = string.Empty;
BibliographicFileIdentifier = string.Empty;
CreationDateAndTime = buildTime;
ModificationDateAndTime = buildTime;
ExpirationDateAndTime = DateTime.MinValue;
EffectiveDateAndTime = buildTime;
FileStructureVersion = 1; // V1
}
public ReaderDirEntry(IsoContext context, DirectoryRecord dirRecord)
{
_context = context;
_record = dirRecord;
_fileName = _record.FileIdentifier;
if (context.SuspDetected && _record.SystemUseData != null)
{
_suspRecords = new SuspRecords(_context, _record.SystemUseData, 0);
}
if (!string.IsNullOrEmpty(_context.RockRidgeIdentifier))
{
// The full name is taken from this record, even if it's a child-link record
List<SystemUseEntry> nameEntries = _suspRecords.GetEntries(_context.RockRidgeIdentifier, "NM");
StringBuilder rrName = new StringBuilder();
if (nameEntries != null && nameEntries.Count > 0)
{
foreach (PosixNameSystemUseEntry nameEntry in nameEntries)
{
rrName.Append(nameEntry.NameData);
}
_fileName = rrName.ToString();
}
// If this is a Rock Ridge child link, replace the dir record with that from the 'self' record
// in the child directory.
ChildLinkSystemUseEntry clEntry = _suspRecords.GetEntry<ChildLinkSystemUseEntry>(_context.RockRidgeIdentifier, "CL");
if (clEntry != null)
{
_context.DataStream.Position = clEntry.ChildDirLocation * _context.VolumeDescriptor.LogicalBlockSize;
byte[] firstSector = Utilities.ReadFully(_context.DataStream, _context.VolumeDescriptor.LogicalBlockSize);
DirectoryRecord.ReadFrom(firstSector, 0, _context.VolumeDescriptor.CharacterEncoding, out _record);
if (_record.SystemUseData != null)
{
_suspRecords = new SuspRecords(_context, _record.SystemUseData, 0);
}
}
}
_lastAccessTimeUtc = _record.RecordingDateAndTime;
_lastWriteTimeUtc = _record.RecordingDateAndTime;
_creationTimeUtc = _record.RecordingDateAndTime;
if (!string.IsNullOrEmpty(_context.RockRidgeIdentifier))
{
FileTimeSystemUseEntry tfEntry = _suspRecords.GetEntry<FileTimeSystemUseEntry>(_context.RockRidgeIdentifier, "TF");
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Access) != 0)
{
_lastAccessTimeUtc = tfEntry.AccessTime;
}
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Modify) != 0)
{
_lastWriteTimeUtc = tfEntry.ModifyTime;
}
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Creation) != 0)
{
_creationTimeUtc = tfEntry.CreationTime;
}
}
}
internal static bool IsSpecialDirectory(DirectoryRecord r)
{
return(r.FileIdentifier == "\0" || r.FileIdentifier == "\x01");
}
public ReaderDirEntry(IsoContext context, DirectoryRecord dirRecord)
{
_context = context;
_record = dirRecord;
_fileName = _record.FileIdentifier;
if (context.SuspDetected && _record.SystemUseData != null)
{
_suspRecords = new SuspRecords(_context, _record.SystemUseData, 0);
}
if (!string.IsNullOrEmpty(_context.RockRidgeIdentifier))
{
// The full name is taken from this record, even if it's a child-link record
List <SystemUseEntry> nameEntries = _suspRecords.GetEntries(_context.RockRidgeIdentifier, "NM");
StringBuilder rrName = new StringBuilder();
if (nameEntries != null && nameEntries.Count > 0)
{
foreach (PosixNameSystemUseEntry nameEntry in nameEntries)
{
rrName.Append(nameEntry.NameData);
}
_fileName = rrName.ToString();
}
// If this is a Rock Ridge child link, replace the dir record with that from the 'self' record
// in the child directory.
ChildLinkSystemUseEntry clEntry = _suspRecords.GetEntry <ChildLinkSystemUseEntry>(_context.RockRidgeIdentifier, "CL");
if (clEntry != null)
{
_context.DataStream.Position = clEntry.ChildDirLocation * _context.VolumeDescriptor.LogicalBlockSize;
byte[] firstSector = Utilities.ReadFully(_context.DataStream, _context.VolumeDescriptor.LogicalBlockSize);
DirectoryRecord.ReadFrom(firstSector, 0, _context.VolumeDescriptor.CharacterEncoding, out _record);
if (_record.SystemUseData != null)
{
_suspRecords = new SuspRecords(_context, _record.SystemUseData, 0);
}
}
}
_lastAccessTimeUtc = _record.RecordingDateAndTime;
_lastWriteTimeUtc = _record.RecordingDateAndTime;
_creationTimeUtc = _record.RecordingDateAndTime;
if (!string.IsNullOrEmpty(_context.RockRidgeIdentifier))
{
FileTimeSystemUseEntry tfEntry = _suspRecords.GetEntry <FileTimeSystemUseEntry>(_context.RockRidgeIdentifier, "TF");
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Access) != 0)
{
_lastAccessTimeUtc = tfEntry.AccessTime;
}
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Modify) != 0)
{
_lastWriteTimeUtc = tfEntry.ModifyTime;
}
if ((tfEntry.TimestampsPresent & FileTimeSystemUseEntry.Timestamps.Creation) != 0)
{
_creationTimeUtc = tfEntry.CreationTime;
}
}
}
internal static bool IsSpecialDirectory(DirectoryRecord r)
{
return r.FileIdentifier == "\0" || r.FileIdentifier == "\x01";
}
/// <summary>
/// Initializes a new instance of the VfsCDReader class.
/// </summary>
/// <param name="data">The stream to read the ISO image from.</param>
/// <param name="variantPriorities">Which possible file system variants to use, and with which priority</param>
/// <param name="hideVersions">Hides version numbers (e.g. ";1") from the end of files</param>
/// <remarks>
/// <para>
/// The implementation considers each of the file system variants in <c>variantProperties</c> and selects
/// the first which is determined to be present. In this example Joliet, then Rock Ridge, then vanilla
/// Iso9660 will be considered:
/// </para>
/// <code lang="cs">
/// VfsCDReader(stream, new Iso9660Variant[] {Joliet, RockRidge, Iso9660}, true);
/// </code>
/// <para>The Iso9660 variant should normally be specified as the final entry in the list. Placing it earlier
/// in the list will effectively mask later items and not including it may prevent some ISOs from being read.</para>
/// </remarks>
public VfsCDReader(Stream data, Iso9660Variant[] variantPriorities, bool hideVersions)
: base(new DiscFileSystemOptions())
{
_data = data;
_hideVersions = hideVersions;
long vdpos = 0x8000; // Skip lead-in
byte[] buffer = new byte[IsoUtilities.SectorSize];
long pvdPos = 0;
long svdPos = 0;
BaseVolumeDescriptor bvd;
do
{
data.Position = vdpos;
int numRead = data.Read(buffer, 0, IsoUtilities.SectorSize);
if (numRead != IsoUtilities.SectorSize)
{
break;
}
bvd = new BaseVolumeDescriptor(buffer, 0);
switch (bvd.VolumeDescriptorType)
{
case VolumeDescriptorType.Boot:
_bootVolDesc = new BootVolumeDescriptor(buffer, 0);
if (_bootVolDesc.SystemId != BootVolumeDescriptor.ElToritoSystemIdentifier)
{
_bootVolDesc = null;
}
break;
case VolumeDescriptorType.Primary: // Primary Vol Descriptor
pvdPos = vdpos;
break;
case VolumeDescriptorType.Supplementary: // Supplementary Vol Descriptor
svdPos = vdpos;
break;
case VolumeDescriptorType.Partition: // Volume Partition Descriptor
break;
case VolumeDescriptorType.SetTerminator: // Volume Descriptor Set Terminator
break;
}
vdpos += IsoUtilities.SectorSize;
}while (bvd.VolumeDescriptorType != VolumeDescriptorType.SetTerminator);
_activeVariant = Iso9660Variant.None;
foreach (var variant in variantPriorities)
{
switch (variant)
{
case Iso9660Variant.Joliet:
if (svdPos != 0)
{
data.Position = svdPos;
data.Read(buffer, 0, IsoUtilities.SectorSize);
var volDesc = new SupplementaryVolumeDescriptor(buffer, 0);
Context = new IsoContext {
VolumeDescriptor = volDesc, DataStream = _data
};
RootDirectory = new ReaderDirectory(Context, new ReaderDirEntry(Context, volDesc.RootDirectory));
_activeVariant = Iso9660Variant.Iso9660;
}
break;
case Iso9660Variant.RockRidge:
case Iso9660Variant.Iso9660:
if (pvdPos != 0)
{
data.Position = pvdPos;
data.Read(buffer, 0, IsoUtilities.SectorSize);
var volDesc = new PrimaryVolumeDescriptor(buffer, 0);
IsoContext context = new IsoContext {
VolumeDescriptor = volDesc, DataStream = _data
};
DirectoryRecord rootSelfRecord = ReadRootSelfRecord(context);
InitializeSusp(context, rootSelfRecord);
if (variant == Iso9660Variant.Iso9660 ||
(variant == Iso9660Variant.RockRidge && !string.IsNullOrEmpty(context.RockRidgeIdentifier)))
{
Context = context;
RootDirectory = new ReaderDirectory(context, new ReaderDirEntry(context, rootSelfRecord));
_activeVariant = variant;
}
}
break;
}
if (_activeVariant != Iso9660Variant.None)
{
break;
}
}
if (_activeVariant == Iso9660Variant.None)
{
throw new IOException("None of the permitted ISO9660 file system variants was detected");
}
}