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using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
public abstract class DerGenerator
: Asn1Generator
{
private bool _tagged = false;
private bool _isExplicit;
private int _tagNo;
protected DerGenerator(
Stream outStream)
: base(outStream)
{
}
protected DerGenerator(
Stream outStream,
int tagNo,
bool isExplicit)
: base(outStream)
{
_tagged = true;
_isExplicit = isExplicit;
_tagNo = tagNo;
}
private static void WriteLength(
Stream outStr,
int length)
{
if (length > 127)
{
int size = 1;
int val = length;
while ((val >>= 8) != 0)
{
size++;
}
outStr.WriteByte((byte)(size | 0x80));
for (int i = (size - 1) * 8; i >= 0; i -= 8)
{
outStr.WriteByte((byte)(length >> i));
}
}
else
{
outStr.WriteByte((byte)length);
}
}
internal static void WriteDerEncoded(
Stream outStream,
int tag,
byte[] bytes)
{
outStream.WriteByte((byte) tag);
WriteLength(outStream, bytes.Length);
outStream.Write(bytes, 0, bytes.Length);
}
internal void WriteDerEncoded(
int tag,
byte[] bytes)
{
if (_tagged)
{
int tagNum = _tagNo | Asn1Tags.ContextSpecific;
if (_isExplicit)
{
int newTag = _tagNo | Asn1Tags.Constructed | Asn1Tags.ContextSpecific;
MemoryStream bOut = new MemoryStream();
WriteDerEncoded(bOut, tag, bytes);
WriteDerEncoded(Out, newTag, bOut.ToArray());
}
else
{
if ((tag & Asn1Tags.Constructed) != 0)
{
tagNum |= Asn1Tags.Constructed;
}
WriteDerEncoded(Out, tagNum, bytes);
}
}
else
{
WriteDerEncoded(Out, tag, bytes);
}
}
internal static void WriteDerEncoded(
Stream outStr,
int tag,
Stream inStr)
{
WriteDerEncoded(outStr, tag, Streams.ReadAll(inStr));
}
}
}
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