internal static CFDirectoryEntry ReadDirectoryEntry(Stream s, long streamOffset, bool isVersion3)
{
byte[] data = ReadFragment(s, streamOffset, DirectoryEntrySize);
CFDirectoryEntry entry = new CFDirectoryEntry();
entry.NameLength = BitConverter.ToUInt16(data, 64);
int nameLength = Math.Min(32, (int)entry.NameLength / 2);
entry.Name = new char[nameLength];
for (int i = 0; i < nameLength; i++)
{
entry.Name[i] = (char)BitConverter.ToChar(data, 2 * i);
}
entry.ObjectType = data[66];
entry.ColorFlag = data[67];
entry.LeftSiblingID = BitConverter.ToUInt32(data, 68);
entry.RightSiblingID = BitConverter.ToUInt32(data, 72);
entry.ChildID = BitConverter.ToUInt32(data, 76);
entry.CLSID = new Guid(GetByteArrayPortion(data, 80, 16)); ;
entry.StateBits = BitConverter.ToUInt32(data, 96);
entry.CreationTime = BitConverter.ToUInt64(data, 100);
entry.ModifiedTime = BitConverter.ToUInt64(data, 108);
entry.StartingSectorLocation = BitConverter.ToUInt32(data, 116);
entry.StreamSize = BitConverter.ToUInt64(data, 120);
if (isVersion3)
entry.StreamSize &= 0xFFFFFFFF;
return entry;
}
private void Initialize()
{
entry = ReaderUtils.ReadDirectoryEntry(System.BaseStream,
GetStreamOffset(), System.IsVersion3);
ReaderUtils.ValidateDirectoryEntry(entry);
}
internal static void ValidateDirectoryEntry(CFDirectoryEntry entry)
{
if(entry.Name.Length * 2 != entry.NameLength || entry.NameLength == 0)
throw new CompoundFileException("Invalid directory entry: name length");
if(entry.Name[entry.Name.Length - 1] != 0)
throw new CompoundFileException("Invalid directory entry: name null termination");
foreach (char ch in entry.Name)
{
if(ch == '/' || ch == '\\' || ch == ':' || ch == '!')
throw new CompoundFileException("Invalid directory entry: illegal char in name");
}
if (entry.ObjectType != DirectoryObjectTypes.Unknown && entry.ObjectType != DirectoryObjectTypes.Storage &&
entry.ObjectType != DirectoryObjectTypes.Stream && entry.ObjectType != DirectoryObjectTypes.RootStorage)
throw new CompoundFileException("Invalid directory entry: object type");
if(entry.ColorFlag != TreeColors.Red && entry.ColorFlag != TreeColors.Black)
throw new CompoundFileException("Invalid directory entry: color flag");
if(entry.LeftSiblingID > DirectoryStreamIds.MAXREGSID && entry.LeftSiblingID != DirectoryStreamIds.NOSTREAM)
throw new CompoundFileException("Invalid directory entry: left sibling");
if (entry.RightSiblingID > DirectoryStreamIds.MAXREGSID && entry.RightSiblingID != DirectoryStreamIds.NOSTREAM)
throw new CompoundFileException("Invalid directory entry: right sibling");
if (entry.ChildID > DirectoryStreamIds.MAXREGSID && entry.ChildID != DirectoryStreamIds.NOSTREAM)
throw new CompoundFileException("Invalid directory entry: child");
}
