void WriteToPOIFS()
{
int oleStreamSize = (int)(fileOut.Length + LittleEndianConsts.LONG_SIZE);
dir.CreateDocument(DEFAULT_POIFS_ENTRY, oleStreamSize, this);
// TODO: any properties???
}
/**
* Encrypt the Document-/SummaryInformation and other optionally streams.
* Opposed to other crypto modes, cryptoapi is record based and can't be used
* to stream-encrypt a whole file
*
* @see <a href="http://msdn.microsoft.com/en-us/library/dd943321(v=office.12).aspx">2.3.5.4 RC4 CryptoAPI Encrypted Summary Stream</a>
*/
public override OutputStream GetDataStream(DirectoryNode dir)
{
CipherByteArrayOutputStream bos = new CipherByteArrayOutputStream(this);
byte[] buf = new byte[8];
bos.Write(buf, 0, 8); // skip header
String[] entryNames =
{
SummaryInformation.DEFAULT_STREAM_NAME,
DocumentSummaryInformation.DEFAULT_STREAM_NAME
};
List <CryptoAPIDecryptor.StreamDescriptorEntry> descList = new List <CryptoAPIDecryptor.StreamDescriptorEntry>();
int block = 0;
foreach (String entryName in entryNames)
{
if (!dir.HasEntry(entryName))
{
continue;
}
CryptoAPIDecryptor.StreamDescriptorEntry descEntry = new CryptoAPIDecryptor.StreamDescriptorEntry();
descEntry.block = block;
descEntry.streamOffset = (int)bos.Length;
descEntry.streamName = entryName;
descEntry.flags = CryptoAPIDecryptor.StreamDescriptorEntry.flagStream.SetValue(0, 1);
descEntry.reserved2 = 0;
bos.SetBlock(block);
DocumentInputStream dis = dir.CreateDocumentInputStream(entryName);
IOUtils.Copy(dis, bos);
dis.Close();
descEntry.streamSize = (int)(bos.Length - descEntry.streamOffset);
descList.Add(descEntry);
dir.GetEntry(entryName).Delete();
block++;
}
int streamDescriptorArrayOffset = (int)bos.Length;
bos.SetBlock(0);
LittleEndian.PutUInt(buf, 0, descList.Count);
bos.Write(buf, 0, 4);
foreach (CryptoAPIDecryptor.StreamDescriptorEntry sde in descList)
{
LittleEndian.PutUInt(buf, 0, sde.streamOffset);
bos.Write(buf, 0, 4);
LittleEndian.PutUInt(buf, 0, sde.streamSize);
bos.Write(buf, 0, 4);
LittleEndian.PutUShort(buf, 0, sde.block);
bos.Write(buf, 0, 2);
LittleEndian.PutUByte(buf, 0, (short)sde.streamName.Length);
bos.Write(buf, 0, 1);
LittleEndian.PutUByte(buf, 0, (short)sde.flags);
bos.Write(buf, 0, 1);
LittleEndian.PutUInt(buf, 0, sde.reserved2);
bos.Write(buf, 0, 4);
byte[] nameBytes = StringUtil.GetToUnicodeLE(sde.streamName);
bos.Write(nameBytes, 0, nameBytes.Length);
LittleEndian.PutShort(buf, 0, (short)0); // null-termination
bos.Write(buf, 0, 2);
}
int savedSize = (int)bos.Length;
int streamDescriptorArraySize = savedSize - streamDescriptorArrayOffset;
LittleEndian.PutUInt(buf, 0, streamDescriptorArrayOffset);
LittleEndian.PutUInt(buf, 4, streamDescriptorArraySize);
bos.Reset();
bos.SetBlock(0);
bos.Write(buf, 0, 8);
bos.SetSize(savedSize);
dir.CreateDocument("EncryptedSummary", new MemoryStream(bos.GetBuf(), 0, savedSize));
DocumentSummaryInformation dsi = PropertySetFactory.NewDocumentSummaryInformation();
try
{
dsi.Write(dir, DocumentSummaryInformation.DEFAULT_STREAM_NAME);
}
catch (WritingNotSupportedException e)
{
throw new IOException(e.Message);
}
//return bos;
throw new NotImplementedException("CipherByteArrayOutputStream should be derived from OutputStream");
}
