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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);
}
/// <remarks>The caller is responsible for disposing the returned <see cref="Stream"/> before disposing
/// this generator.</remarks>
public Stream GetOctetOutputStream()
{
return GetOctetOutputStream(new byte[1000]); // limit for CER encoding.
}
/// <remarks>The caller is responsible for disposing the returned <see cref="Stream"/> before disposing
/// this generator.</remarks>
public Stream GetOctetOutputStream(int bufSize)
{
return bufSize < 1
? GetOctetOutputStream()
: GetOctetOutputStream(new byte[bufSize]);
}
/// <remarks>The caller is responsible for disposing the returned <see cref="Stream"/> before disposing
/// this generator.</remarks>
public Stream GetOctetOutputStream(byte[] buf)
{
return new BufferedBerOctetStream(GetRawOutputStream(), buf);
}
private class BufferedBerOctetStream
: BaseOutputStream
{
private byte[] _buf;
private int _off;
private readonly Asn1OutputStream _derOut;
internal BufferedBerOctetStream(Stream outStream, byte[] buf)
{
_buf = buf;
_off = 0;
_derOut = Asn1OutputStream.Create(outStream, Asn1Encodable.Der);
}
public override void Write(byte[] buffer, int offset, int count)
{
Streams.ValidateBufferArguments(buffer, offset, count);
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Write(buffer.AsSpan(offset, count));
#else
int bufLen = _buf.Length;
int available = bufLen - _off;
if (count < available)
{
Array.Copy(buffer, offset, _buf, _off, count);
_off += count;
return;
}
int pos = 0;
if (_off > 0)
{
Array.Copy(buffer, offset, _buf, _off, available);
pos = available;
DerOctetString.Encode(_derOut, _buf, 0, bufLen);
//_off = 0;
}
int remaining;
while ((remaining = count - pos) >= bufLen)
{
DerOctetString.Encode(_derOut, buffer, offset + pos, bufLen);
pos += bufLen;
}
Array.Copy(buffer, offset + pos, _buf, 0, remaining);
this._off = remaining;
#endif
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override void Write(ReadOnlySpan<byte> buffer)
{
int bufLen = _buf.Length;
int available = bufLen - _off;
if (buffer.Length < available)
{
buffer.CopyTo(_buf.AsSpan(_off));
_off += buffer.Length;
return;
}
if (_off > 0)
{
DerOctetString.Encode(_derOut, _buf.AsSpan(0, _off), buffer[..available]);
buffer = buffer[available..];
//_off = 0;
}
while (buffer.Length >= bufLen)
{
DerOctetString.Encode(_derOut, buffer[..bufLen]);
buffer = buffer[bufLen..];
}
buffer.CopyTo(_buf.AsSpan());
_off = buffer.Length;
}
#endif
public override void WriteByte(byte value)
{
_buf[_off++] = value;
if (_off == _buf.Length)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
_off = 0;
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_off != 0)
{
DerOctetString.Encode(_derOut, _buf, 0, _off);
_off = 0;
}
_derOut.FlushInternal();
}
base.Dispose(disposing);
}
}
}
}
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