/// <summary>
/// Overrides the default implementation to encrypt the data, then write it to the underlying stream
/// </summary>
/// <param name="pfo"></param>
protected override void WriteIndirectStreamData(IIndirectObject pfo)
{
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.Begin(TraceLevel.Debug, "Secure Writer", "Encrypting stream for object '" + pfo.Number + " " + pfo.Generation + "'");
}
using (var mon = this._monitor.Record(PerformanceMonitorType.Encrypting_Streams, pfo.ToString()))
{
byte[] unencrypted = pfo.Stream.GetStreamData();
IStreamFilter enc = CreateEncryptionFilter(pfo.Number, pfo.Generation);
byte[] encrypted = enc.FilterStream(unencrypted);
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.Add(TraceLevel.Debug, "Encryption", "Encrypted stream from original " + unencrypted.Length + "bytes, now writing " + encrypted.Length + " encypted data bytes");
}
this.BaseStream.Write(Constants.StartStream);
this.BaseStream.Write(encrypted);
this.BaseStream.Write(Constants.EndStream);
}
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.End(TraceLevel.Debug, "Secure Writer", "Encrypting stream for object '" + pfo.Number + " " + pfo.Generation + "'");
}
else if (this.TraceLog.ShouldLog(TraceLevel.Verbose))
{
this.TraceLog.Add(TraceLevel.Verbose, "Encryption", "Encrypted the stream data for " + pfo.ToString());
}
}
private void CompressFontFileData(byte[] orig)
{
IStreamFilter filter = PDFStreamFilters.FlateDecode;
this._filtereddata = filter.FilterStream(orig);
this._filterName = filter.FilterName;
}
private byte[] ApplyFilters(IStreamFilter[] filters, byte[] input)
{
byte[] output = null;
try
{
for (int i = 0; i < filters.Length; i++)
{
IStreamFilter filter = this.Filters[i];
output = filter.FilterStream(input);
input = output;
}
}
catch (Exception ex)
{
string msg = string.Format(CommonErrors.CouldNotApplyStreamFilters, this.IndirectObject.ToString(), ex.Message);
throw new PDFStreamException(msg, ex);
}
return(output);
}
/// <summary>
/// Overrides the default implementation to encrypt the data, then write it to the underlying stream
/// </summary>
/// <param name="pfo"></param>
protected override void WriteIndirectStreamData(IIndirectObject pfo)
{
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.Begin(TraceLevel.Debug, "Secure Writer", "Encrypting stream for object '" + pfo.Number + " " + pfo.Generation + "'");
}
byte[] unencrypted = pfo.Stream.GetStreamData();
IStreamFilter enc = CreateEncryptionFilter(pfo.Number, pfo.Generation);
byte[] encrypted = enc.FilterStream(unencrypted);
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.Add(TraceLevel.Debug, "Encryption", "Encrypted stream data, now writing");
}
this.BaseStream.Write(Constants.StartStream);
this.BaseStream.Write(encrypted);
this.BaseStream.Write(Constants.EndStream);
if (this.TraceLog.ShouldLog(TraceLevel.Debug))
{
this.TraceLog.End(TraceLevel.Debug, "Secure Writer", "Encrypting stream for object '" + pfo.Number + " " + pfo.Generation + "'");
}
}