/// <summary>
/// Gets an entry from the stream represented by the PropertyEntry
/// </summary>
/// <param name="entry">A property entry</param>
/// <param name="storage">The storage to read from</param>
/// <returns>An object representing the variable-length property</returns>
internal object GetVariableLengthProperty(PropertyEntry entry, string storage = null)
{
object obj;
CFStream stream;
//Get the value of the property.
string name = string.Format("__substg1.0_{0:X4}{1:X4}", entry.PropertyTag.ID, (short)entry.PropertyTag.Type);
if (storage == null)
stream = _compoundFile.RootStorage.GetStream(name);
else
stream = _compoundFile.RootStorage.GetStorage(storage).GetStream(name);
switch (entry.PropertyTag.Type)
{
case PropertyType.PtypString:
obj = Encoding.Unicode.GetString(stream.GetData());
break;
case PropertyType.PtypString8:
obj = Encoding.Default.GetString(stream.GetData());
break;
case PropertyType.PtypBinary:
obj = stream.GetData(); //binary data. Just return as-is. May be in the following format: https://msdn.microsoft.com/en-us/library/dd947045(v=office.12).aspx
break;
case PropertyType.PtypGuid:
obj = new Guid(stream.GetData());
break;
case PropertyType.PtypObject:
//See https://msdn.microsoft.com/en-us/library/ee200950(v=exchg.80).aspx
//Drink lots!
default:
obj = null;
break;
}
return obj;
}
internal NamedProperty MapProperty(PropertyEntry entry)
{
int entryStreamIndex = GetEntryStreamIndex(entry.PropertyTag.ID); //find the index into the entry stream
var propEntry = _propParser.Entries[entryStreamIndex]; //grab the relevent entry
int guidIndex = GetGuidStreamIndex(propEntry.GUIDIndex); //find the index into the guid stream
Guid guid = _propParser.Guids[guidIndex];
NamedProperty namedProperty = new NamedProperty() { GUID = guid, Entry = entry, ID = propEntry.NameIdentifier };
if (propEntry.IsString)
{
string name = _propParser.ReadStringStream(propEntry.NameIdentifier);
namedProperty.Name = name;
}
return namedProperty;
}
internal static object ParseEntry(PropertyEntry entry)
{
object obj = null;
if (IsFixedLength(entry.PropertyTag.Type))
{
switch (entry.PropertyTag.Type)
{
//ints
case PropertyType.PtypInteger16:
obj = BitConverter.ToInt16(entry.Value, 0);
break;
case PropertyType.PtypInteger32:
case PropertyType.PtypErrorCode:
obj = BitConverter.ToInt32(entry.Value, 0);
break;
case PropertyType.PtypInteger64:
case PropertyType.PtypCurrency:
obj = BitConverter.ToInt64(entry.Value, 0);
break;
//floats
case PropertyType.PtypFloating32:
obj = BitConverter.ToSingle(entry.Value, 0);
break;
case PropertyType.PtypFloating64:
//case PropertyType.PtypFloatingTime:
obj = BitConverter.ToDouble(entry.Value, 0);
break;
//other
case PropertyType.PtypBoolean:
obj = BitConverter.ToBoolean(entry.Value, 0);
break;
//PtypTime - 8 bytes; a 64-bit integer representing the number of 100-nanosecond intervals since January 1, 1601
case PropertyType.PtypTime:
DateTime dt = new DateTime(1601, 1, 1, 0, 0, 0, DateTimeKind.Utc);
obj = dt.AddTicks(BitConverter.ToInt64(entry.Value, 0));
break;
default:
return null;
}
}
return obj;
}
/// <summary>
/// This will read an entry from the property stream
/// </summary>
/// <param name="entry">An array of bytes representing an entry</param>
/// <returns>A parsed PropertyEntry structure</returns>
private PropertyEntry ReadPropertyEntry(byte[] entry)
{
PropertyEntry propEntry;
PropertyTag tag = new PropertyTag();
tag.Type = (PropertyType)BitConverter.ToInt16(entry, 0);
tag.ID = BitConverter.ToUInt16(entry, 2);
if (TypeMapper.IsFixedLength(tag.Type))
{
propEntry = new PropertyEntry();
}
else
{
propEntry = new VariableLengthPropertyEntry();
}
propEntry.PropertyTag = tag;
propEntry.Flags = BitConverter.ToInt32(entry, 4);
propEntry.Value = entry.Skip(8).ToArray();
return propEntry;
}
