/**
* 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);
}
/**
* 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;
}
