BERGenerator.cs
2.19 KB
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using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
public class BerGenerator
: Asn1Generator
{
private bool _tagged = false;
private bool _isExplicit;
private int _tagNo;
protected BerGenerator(
Stream outStream)
: base(outStream)
{
}
public BerGenerator(
Stream outStream,
int tagNo,
bool isExplicit)
: base(outStream)
{
_tagged = true;
_isExplicit = isExplicit;
_tagNo = tagNo;
}
public override void AddObject(
Asn1Encodable obj)
{
new BerOutputStream(Out).WriteObject(obj);
}
public override Stream GetRawOutputStream()
{
return Out;
}
public override void Close()
{
WriteBerEnd();
}
private void WriteHdr(
int tag)
{
Out.WriteByte((byte) tag);
Out.WriteByte(0x80);
}
protected void WriteBerHeader(
int tag)
{
if (_tagged)
{
int tagNum = _tagNo | Asn1Tags.Tagged;
if (_isExplicit)
{
WriteHdr(tagNum | Asn1Tags.Constructed);
WriteHdr(tag);
}
else
{
if ((tag & Asn1Tags.Constructed) != 0)
{
WriteHdr(tagNum | Asn1Tags.Constructed);
}
else
{
WriteHdr(tagNum);
}
}
}
else
{
WriteHdr(tag);
}
}
protected void WriteBerBody(
Stream contentStream)
{
Streams.PipeAll(contentStream, Out);
}
protected void WriteBerEnd()
{
Out.WriteByte(0x00);
Out.WriteByte(0x00);
if (_tagged && _isExplicit) // write extra end for tag header
{
Out.WriteByte(0x00);
Out.WriteByte(0x00);
}
}
}
}