/**
* Generate an object that contains an CMS Compressed Data
*/
public CmsCompressedData Generate(
CmsProcessable content,
string compressionOid)
{
AlgorithmIdentifier comAlgId;
Asn1OctetString comOcts;
try
{
MemoryStream bOut = new MemoryStream();
ZDeflaterOutputStream zOut = new ZDeflaterOutputStream(bOut);
content.Write(zOut);
zOut.Close();
comAlgId = new AlgorithmIdentifier(
new DerObjectIdentifier(compressionOid),
null);
comOcts = new BerOctetString(bOut.ToArray());
}
catch (IOException e)
{
throw new CmsException("exception encoding data.", e);
}
ContentInfo comContent = new ContentInfo(CmsObjectIdentifiers.Data, comOcts);
ContentInfo contentInfo = new ContentInfo(
CmsObjectIdentifiers.CompressedData,
new CompressedData(comAlgId, comContent));
return new CmsCompressedData(contentInfo);
}
internal CmsCompressedOutputStream(
ZDeflaterOutputStream outStream,
BerSequenceGenerator sGen,
BerSequenceGenerator cGen,
BerSequenceGenerator eiGen)
{
_out = outStream;
_sGen = sGen;
_cGen = cGen;
_eiGen = eiGen;
}
public override void ToPdf(PdfWriter writer, Stream os)
{
if (inputStream != null && compressed)
Put(PdfName.FILTER, PdfName.FLATEDECODE);
PdfEncryption crypto = null;
if (writer != null)
crypto = writer.Encryption;
if (crypto != null) {
PdfObject filter = Get(PdfName.FILTER);
if (filter != null) {
if (PdfName.CRYPT.Equals(filter))
crypto = null;
else if (filter.IsArray()) {
PdfArray a = ((PdfArray)filter);
if (a.Size > 0 && PdfName.CRYPT.Equals(a[0]))
crypto = null;
}
}
}
PdfObject nn = Get(PdfName.LENGTH);
if (crypto != null && nn != null && nn.IsNumber()) {
int sz = ((PdfNumber)nn).IntValue;
Put(PdfName.LENGTH, new PdfNumber(crypto.CalculateStreamSize(sz)));
SuperToPdf(writer, os);
Put(PdfName.LENGTH, nn);
}
else
SuperToPdf(writer, os);
os.Write(STARTSTREAM, 0, STARTSTREAM.Length);
if (inputStream != null) {
rawLength = 0;
ZDeflaterOutputStream def = null;
OutputStreamCounter osc = new OutputStreamCounter(os);
OutputStreamEncryption ose = null;
Stream fout = osc;
if (crypto != null && !crypto.IsEmbeddedFilesOnly())
fout = ose = crypto.GetEncryptionStream(fout);
if (compressed)
fout = def = new ZDeflaterOutputStream(fout, compressionLevel);
byte[] buf = new byte[4192];
while (true) {
int n = inputStream.Read(buf, 0, buf.Length);
if (n <= 0)
break;
fout.Write(buf, 0, n);
rawLength += n;
}
if (def != null)
def.Finish();
if (ose != null)
ose.Finish();
inputStreamLength = osc.Counter;
}
else {
if (crypto != null && !crypto.IsEmbeddedFilesOnly()) {
byte[] b;
if (streamBytes != null) {
b = crypto.EncryptByteArray(streamBytes.ToArray());
}
else {
b = crypto.EncryptByteArray(bytes);
}
os.Write(b, 0, b.Length);
}
else {
if (streamBytes != null)
streamBytes.WriteTo(os);
else
os.Write(bytes, 0, bytes.Length);
}
}
os.Write(ENDSTREAM, 0, ENDSTREAM.Length);
}
/**
* Sets the data associated with the stream, either compressed or
* uncompressed. Note that the data will never be compressed if
* Document.compress is set to false.
*
* @param data raw data, decrypted and uncompressed.
* @param compress true if you want the stream to be compresssed.
* @param compressionLevel a value between -1 and 9 (ignored if compress == false)
* @since iText 2.1.3
*/
public void SetData(byte[] data, bool compress, int compressionLevel)
{
Remove(PdfName.FILTER);
this.offset = -1;
if (Document.Compress && compress) {
MemoryStream stream = new MemoryStream();
ZDeflaterOutputStream zip = new ZDeflaterOutputStream(stream, compressionLevel);
zip.Write(data, 0, data.Length);
zip.Close();
bytes = stream.ToArray();
this.compressionLevel = compressionLevel;
Put(PdfName.FILTER, PdfName.FLATEDECODE);
}
else
bytes = data;
Length = bytes.Length;
}