/**
* 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();
ZOutputStream zOut = new ZOutputStream(bOut, JZlib.Z_DEFAULT_COMPRESSION);
content.Write(zOut);
zOut.Close();
comAlgId = new AlgorithmIdentifier(new DerObjectIdentifier(compressionOid));
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);
}
/**
* Creates a new PDF stream object that will replace a stream
* in a existing PDF file.
* @param reader the reader that holds the existing PDF
* @param conts the new content
* @param compressionLevel the compression level for the content
* @since 2.1.3 (replacing the existing constructor without param compressionLevel)
*/
public PRStream(PdfReader reader, byte[] conts, int compressionLevel)
{
this.reader = reader;
this.offset = -1;
if (Document.Compress) {
MemoryStream stream = new MemoryStream();
var zip = new ZOutputStream(stream, compressionLevel);
zip.Write(conts, 0, conts.Length);
zip.Close();
bytes = stream.ToArray();
Put(PdfName.FILTER, PdfName.FLATEDECODE);
}
else
bytes = conts;
Length = bytes.Length;
}
