/// <summary>
/// Populates the value of variable length properties
/// </summary>
private void PopulateVariableLengthProperties(PropertyStream ps, string storage)
{
var variableLengthReader = new VariableLengthStreamReader(_compoundFile);
foreach (var item in ps.Data)
{
if (!TypeMapper.IsFixedLength(item.PropertyTag.Type))
{
object obj = variableLengthReader.GetVariableLengthProperty(item, storage);
(item as VariableLengthPropertyEntry).VariableLengthData = obj;
}
}
}
/// <summary>
/// This method returns the stream names of named properties
/// </summary>
/// <returns></returns>
private List<PropertyEntry> GetNamedProperties(PropertyStream ps)
{
List<PropertyEntry> namedProperties = new List<PropertyEntry>();
foreach (var item in ps.Data)
{
if (item.PropertyTag.ID >= 0x8000 && item.PropertyTag.ID <= 0x8FFF)
{
namedProperties.Add(item);
}
}
return namedProperties;
}
/// <summary>
/// The class will read and parse a property stream.
/// See https://msdn.microsoft.com/en-us/library/ee203894(v=exchg.80).aspx for the structure.
/// </summary>
/// <param name="storage">Which storage to read from. If null, read from the top-level storage</param>
/// <returns>A populated Property Stream</returns>
internal PropertyStream ReadPropertyStream(string storage = null)
{
PropertyStream ps = new PropertyStream();
ps.Header = new Headers.TopLevelHeader();
CFStream propStream;
byte[] data;
if (storage == null) // we want the top-level property stream
{
propStream = _compoundFile.RootStorage.GetStream(PropertyStream.STREAM_NAME);
data = propStream.GetData();
ps.Header.NextRecipientId = BitConverter.ToInt32(data, 8);
ps.Header.NextAttachmentId = BitConverter.ToInt32(data, 12);
ps.Header.RecipientCount = BitConverter.ToInt32(data, 16);
ps.Header.AttachmentCount = BitConverter.ToInt32(data, 20);
ps.NumberOfProperties = (data.Length - Headers.TopLevelHeader.HEADER_SIZE_BYTES) / PropertyEntry.SIZE_BYTES;
ps.Data = new List<PropertyEntry>();
for (int i = 0; i < ps.NumberOfProperties; i++)
{
//start reading at 32
ps.Data.Add(ReadPropertyEntry(data.Skip(Headers.TopLevelHeader.HEADER_SIZE_BYTES).Skip(i * 16).Take(16).ToArray()));
}
}
else //we want the attachment/recipient property stream
{
propStream = _compoundFile.RootStorage.GetStorage(storage).GetStream(PropertyStream.STREAM_NAME);
data = propStream.GetData();
ps.NumberOfProperties = (data.Length - Headers.BaseHeader.HEADER_SIZE_BYTES) / PropertyEntry.SIZE_BYTES;
ps.Data = new List<PropertyEntry>();
for (int i = 0; i < ps.NumberOfProperties; i++)
{
//start reading at 8
ps.Data.Add(ReadPropertyEntry(data.Skip(Headers.BaseHeader.HEADER_SIZE_BYTES).Skip(i * 16).Take(16).ToArray()));
}
}
PopulateVariableLengthProperties(ps, storage);
return ps;
}
/// <summary>
/// This will get and parse named properties
/// </summary>
/// <param name="ps">A populated property stream</param>
/// <returns>A list of NamedProperty objects</returns>
private List<NamedProperty> ParseNamedProperties(PropertyStream ps)
{
NamedPropertyMapper mapper = new NamedPropertyMapper(_namedPropertyParser);
List<PropertyEntry> namedPropertyEntries = GetNamedProperties(ps);
List<NamedProperty> namedProperties = new List<NamedProperty>();
foreach (var property in namedPropertyEntries)
{
namedProperties.Add(mapper.MapProperty(property));
}
return namedProperties;
}
