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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Cms
{
/**
* General class for generating a compressed CMS message.
* <p>
* A simple example of usage.</p>
* <p>
* <pre>
* CMSCompressedDataGenerator fact = new CMSCompressedDataGenerator();
* CMSCompressedData data = fact.Generate(content, algorithm);
* </pre>
* </p>
*/
public class CmsCompressedDataGenerator
{
public static readonly string ZLib = CmsObjectIdentifiers.ZlibCompress.Id;
public CmsCompressedDataGenerator()
{
}
/**
* Generate an object that contains an CMS Compressed Data
*/
public CmsCompressedData Generate(CmsProcessable content, string compressionOid)
{
if (ZLib != compressionOid)
throw new ArgumentException("Unsupported compression algorithm: " + compressionOid,
nameof(compressionOid));
AlgorithmIdentifier comAlgId;
Asn1OctetString comOcts;
try
{
MemoryStream bOut = new MemoryStream();
using (var zOut = Utilities.IO.Compression.ZLib.CompressOutput(bOut, -1))
{
content.Write(zOut);
}
comAlgId = new AlgorithmIdentifier(CmsObjectIdentifiers.ZlibCompress);
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);
}
}
}
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