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using System;
using System.IO;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
public class BerOctetStringGenerator
: BerGenerator
{
public BerOctetStringGenerator(Stream outStream)
: base(outStream)
{
WriteBerHeader(Asn1Tags.Constructed | Asn1Tags.OctetString);
}
public BerOctetStringGenerator(
Stream outStream,
int tagNo,
bool isExplicit)
: base(outStream, tagNo, isExplicit)
{
WriteBerHeader(Asn1Tags.Constructed | Asn1Tags.OctetString);
}
public Stream GetOctetOutputStream()
{
return GetOctetOutputStream(new byte[1000]); // limit for CER encoding.
}
public Stream GetOctetOutputStream(
int bufSize)
{
return bufSize < 1
? GetOctetOutputStream()
: GetOctetOutputStream(new byte[bufSize]);
}
public Stream GetOctetOutputStream(
byte[] buf)
{
return new BufferedBerOctetStream(this, buf);
}
private class BufferedBerOctetStream
: BaseOutputStream
{
private byte[] _buf;
private int _off;
private readonly BerOctetStringGenerator _gen;
private readonly DerOutputStream _derOut;
internal BufferedBerOctetStream(
BerOctetStringGenerator gen,
byte[] buf)
{
_gen = gen;
_buf = buf;
_off = 0;
_derOut = new DerOutputStream(_gen.Out);
}
public override void WriteByte(
byte b)
{
_buf[_off++] = b;
if (_off == _buf.Length)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
_off = 0;
}
}
public override void Write(
byte[] buf,
int offset,
int len)
{
while (len > 0)
{
int numToCopy = System.Math.Min(len, _buf.Length - _off);
if (numToCopy == _buf.Length)
{
DerOctetString.Encode(_derOut, buf, offset, numToCopy);
}
else
{
Array.Copy(buf, offset, _buf, _off, numToCopy);
_off += numToCopy;
if (_off < _buf.Length)
break;
DerOctetString.Encode(_derOut, _buf, 0, _off);
_off = 0;
}
offset += numToCopy;
len -= numToCopy;
}
}
public override void Close()
{
if (_off != 0)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
}
_gen.WriteBerEnd();
base.Close();
}
}
}
}
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