/**
* Return the uncompressed content, throwing an exception if the data size
* is greater than the passed in limit. If the content is exceeded getCause()
* on the CMSException will contain a StreamOverflowException
*
* @param limit maximum number of bytes to read
* @return the content read
* @throws CMSException if there is an exception uncompressing the data.
*/
public byte[] GetContent(int limit)
{
CompressedData comData = CompressedData.GetInstance(contentInfo.Content);
ContentInfo content = comData.EncapContentInfo;
Asn1OctetString bytes = (Asn1OctetString)content.Content;
ZInputStream zIn = new ZInputStream(new MemoryStream(bytes.GetOctets(), false));
try
{
return CmsUtilities.StreamToByteArray(zIn, limit);
}
catch (IOException e)
{
throw new CmsException("exception reading compressed stream.", e);
}
}
/**
* Return the uncompressed content.
*
* @return the uncompressed content
* @throws CmsException if there is an exception uncompressing the data.
*/
public byte[] GetContent()
{
CompressedData comData = CompressedData.GetInstance(contentInfo.Content);
ContentInfo content = comData.EncapContentInfo;
Asn1OctetString bytes = (Asn1OctetString) content.Content;
ZInputStream zIn = new ZInputStream(bytes.GetOctetStream());
try
{
return CmsUtilities.StreamToByteArray(zIn);
}
catch (IOException e)
{
throw new CmsException("exception reading compressed stream.", e);
}
finally
{
zIn.Close();
}
}
private void DecryptEncryptedDataStream(Stream outputPlaintextStream, ICryptoTransform decryptor, AxCryptDataStream encryptedDataStream, ProgressContext progress)
{
Exception savedExceptionIfCloseCausesCryptographicException = null;
try
{
if (DocumentHeaders.IsCompressed)
{
using (CryptoStream deflatedPlaintextStream = new CryptoStream(encryptedDataStream, decryptor, CryptoStreamMode.Read))
{
using (ZInputStream inflatedPlaintextStream = new ZInputStream(deflatedPlaintextStream))
{
try
{
CopyToWithCount(inflatedPlaintextStream, outputPlaintextStream, encryptedDataStream, progress);
}
catch (Exception ex)
{
savedExceptionIfCloseCausesCryptographicException = ex;
throw;
}
}
}
}
else
{
using (Stream plainStream = new CryptoStream(encryptedDataStream, decryptor, CryptoStreamMode.Read))
{
try
{
CopyToWithCount(plainStream, outputPlaintextStream, encryptedDataStream, progress);
}
catch (Exception ex)
{
savedExceptionIfCloseCausesCryptographicException = ex;
throw;
}
}
}
}
catch (CryptographicException)
{
throw savedExceptionIfCloseCausesCryptographicException;
}
}