private void Write(PdfStream pdfStream)
{
try {
bool userDefinedCompression = pdfStream.GetCompressionLevel() != CompressionConstants.UNDEFINED_COMPRESSION;
if (!userDefinedCompression)
{
int defaultCompressionLevel = document != null?document.GetWriter().GetCompressionLevel() : CompressionConstants
.DEFAULT_COMPRESSION;
pdfStream.SetCompressionLevel(defaultCompressionLevel);
}
bool toCompress = pdfStream.GetCompressionLevel() != CompressionConstants.NO_COMPRESSION;
bool allowCompression = !pdfStream.ContainsKey(PdfName.Filter) && IsNotMetadataPdfStream(pdfStream);
if (pdfStream.GetInputStream() != null)
{
Stream fout = this;
DeflaterOutputStream def = null;
OutputStreamEncryption ose = null;
if (crypto != null && !crypto.IsEmbeddedFilesOnly())
{
fout = ose = crypto.GetEncryptionStream(fout);
}
if (toCompress && (allowCompression || userDefinedCompression))
{
UpdateCompressionFilter(pdfStream);
fout = def = new DeflaterOutputStream(fout, pdfStream.GetCompressionLevel(), 0x8000);
}
this.Write((PdfDictionary)pdfStream);
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.stream);
long beginStreamContent = GetCurrentPos();
byte[] buf = new byte[4192];
while (true)
{
int n = pdfStream.GetInputStream().Read(buf);
if (n <= 0)
{
break;
}
fout.Write(buf, 0, n);
}
if (def != null)
{
def.Finish();
}
if (ose != null)
{
ose.Finish();
}
PdfNumber length = pdfStream.GetAsNumber(PdfName.Length);
length.SetValue((int)(GetCurrentPos() - beginStreamContent));
pdfStream.UpdateLength(length.IntValue());
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.endstream);
}
else
{
//When document is opened in stamping mode the output stream can be uninitialized.
//We have to initialize it and write all data from streams input to streams output.
if (pdfStream.GetOutputStream() == null && pdfStream.GetIndirectReference().GetReader() != null)
{
// If new specific compression is set for stream,
// then compressed stream should be decoded and written with new compression settings
byte[] bytes = pdfStream.GetIndirectReference().GetReader().ReadStreamBytes(pdfStream, false);
if (userDefinedCompression)
{
bytes = DecodeFlateBytes(pdfStream, bytes);
}
pdfStream.InitOutputStream(new ByteArrayOutputStream(bytes.Length));
pdfStream.GetOutputStream().Write(bytes);
}
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "PdfStream lost OutputStream");
ByteArrayOutputStream byteArrayStream;
try {
if (toCompress && !ContainsFlateFilter(pdfStream) && (allowCompression || userDefinedCompression))
{
// compress
UpdateCompressionFilter(pdfStream);
byteArrayStream = new ByteArrayOutputStream();
DeflaterOutputStream zip = new DeflaterOutputStream(byteArrayStream, pdfStream.GetCompressionLevel());
if (pdfStream is PdfObjectStream)
{
PdfObjectStream objectStream = (PdfObjectStream)pdfStream;
((ByteArrayOutputStream)objectStream.GetIndexStream().GetOutputStream()).WriteTo(zip);
((ByteArrayOutputStream)objectStream.GetOutputStream().GetOutputStream()).WriteTo(zip);
}
else
{
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "Error in outputStream");
((ByteArrayOutputStream)pdfStream.GetOutputStream().GetOutputStream()).WriteTo(zip);
}
zip.Finish();
}
else
{
if (pdfStream is PdfObjectStream)
{
PdfObjectStream objectStream = (PdfObjectStream)pdfStream;
byteArrayStream = new ByteArrayOutputStream();
((ByteArrayOutputStream)objectStream.GetIndexStream().GetOutputStream()).WriteTo(byteArrayStream);
((ByteArrayOutputStream)objectStream.GetOutputStream().GetOutputStream()).WriteTo(byteArrayStream);
}
else
{
System.Diagnostics.Debug.Assert(pdfStream.GetOutputStream() != null, "Error in outputStream");
byteArrayStream = (ByteArrayOutputStream)pdfStream.GetOutputStream().GetOutputStream();
}
}
if (CheckEncryption(pdfStream))
{
ByteArrayOutputStream encodedStream = new ByteArrayOutputStream();
OutputStreamEncryption ose = crypto.GetEncryptionStream(encodedStream);
byteArrayStream.WriteTo(ose);
ose.Finish();
byteArrayStream = encodedStream;
}
}
catch (System.IO.IOException ioe) {
throw new PdfException(PdfException.IoException, ioe);
}
pdfStream.Put(PdfName.Length, new PdfNumber(byteArrayStream.Length));
pdfStream.UpdateLength((int)byteArrayStream.Length);
this.Write((PdfDictionary)pdfStream);
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.stream);
byteArrayStream.WriteTo(this);
byteArrayStream.Dispose();
WriteBytes(iText.Kernel.Pdf.PdfOutputStream.endstream);
}
}
catch (System.IO.IOException e) {
throw new PdfException(PdfException.CannotWriteToPdfStream, e, pdfStream);
}
}