private void ReadDirRecord(IsoRecord record)
{
byte len = ReadByte();
// Some CDs can have incorrect value len = 48 ('0') in VolumeDescriptor.
// But maybe we must use real "len" for other records.
len = 34;
ReadDirRecord(record, len);
}
private void ReadDirRecord(IsoRecord record, byte length)
{
record.ExtendedAttributeRecordLen = ReadByte();
if (record.ExtendedAttributeRecordLen != 0)
throw new InvalidDataException();
record._location = ReadInt64();
record.DataLength = ReadInt64();
ReadRecordingDateTime(record._DateTime);
record.Flags = ReadByte();
record.FileUnitSize = ReadByte();
record.InterleaveGapSize = ReadByte();
record.VolSequenceNumber = ReadInt32();
byte idLen = ReadByte();
record.FileId = new byte[idLen];
ReadBytes(record.FileId, idLen);
int padSize = 1 - (idLen & 1);
Skeep(1 - ((int)idLen & 1)); // it's bug in some cd's. Must be zeros
int curPos = 33 + idLen + padSize;
if (curPos > length)
throw new InvalidDataException();
int rem = length - curPos;
record.SystemUse = new byte[rem];
ReadBytes(record.SystemUse, rem);
}
private IsoReader()
{
_rootDirectory = new IsoRecord();
_volumeDescriptor = new List<VolumeDescriptor>();
}
private void ReadDir(IsoRecord record, int level)
{
record.IsJoliet = IsJoliet;
if (!record.IsDirectory)
return;
SeekToBlock(record.Location);
long startPos = _currentPosition;
bool firstItem = true;
for (; ; )
{
long offset = _currentPosition - startPos;
if (offset >= record.DataLength)
break;
byte len = ReadByte();
if (len == 0)
continue;
IsoRecord subItem = new IsoRecord();
subItem._Parent = record;
ReadDirRecord(subItem, len);
if (firstItem && level == 0)
IsSusp = subItem.CheckSusp(SuspSkipSize);
if (!subItem.IsSystemItem)
{
record.SubItems.Add(subItem);
}
firstItem = false;
}
for (int i = 0; i < record.SubItems.Count; i++)
ReadDir(record.SubItems[i] as IsoRecord, level + 1);
}