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using System;
using System.Diagnostics;
using System.IO;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System.Buffers.Binary;
using System.Numerics;
#endif
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Asn1
{
public class Asn1OutputStream
: FilterStream
{
internal const int EncodingBer = 1;
internal const int EncodingDL = 2;
internal const int EncodingDer = 3;
public static Asn1OutputStream Create(Stream output)
{
return new Asn1OutputStream(output, false);
}
public static Asn1OutputStream Create(Stream output, string encoding)
{
return Create(output, encoding, false);
}
public static Asn1OutputStream Create(Stream output, string encoding, bool leaveOpen)
{
if (Asn1Encodable.Der.Equals(encoding))
return new DerOutputStream(output, leaveOpen);
if (Asn1Encodable.DL.Equals(encoding))
return new DLOutputStream(output, leaveOpen);
return new Asn1OutputStream(output, leaveOpen);
}
internal static int GetEncodingType(string encoding)
{
if (Asn1Encodable.Der.Equals(encoding))
return EncodingDer;
if (Asn1Encodable.DL.Equals(encoding))
return EncodingDL;
return EncodingBer;
}
private readonly bool m_leaveOpen;
protected internal Asn1OutputStream(Stream output, bool leaveOpen)
: base(output)
{
if (!output.CanWrite)
throw new ArgumentException("Expected stream to be writable", nameof(output));
m_leaveOpen = leaveOpen;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
FlushInternal();
}
if (m_leaveOpen)
{
base.Detach(disposing);
}
else
{
base.Dispose(disposing);
}
}
public virtual void WriteObject(Asn1Encodable asn1Encodable)
{
if (null == asn1Encodable)
throw new ArgumentNullException("asn1Encodable");
asn1Encodable.ToAsn1Object().GetEncoding(this.Encoding).Encode(this);
FlushInternal();
}
public virtual void WriteObject(Asn1Object asn1Object)
{
if (null == asn1Object)
throw new ArgumentNullException("asn1Object");
asn1Object.GetEncoding(this.Encoding).Encode(this);
FlushInternal();
}
internal void EncodeContents(IAsn1Encoding[] contentsEncodings)
{
for (int i = 0, count = contentsEncodings.Length; i < count; ++i)
{
contentsEncodings[i].Encode(this);
}
}
internal virtual int Encoding
{
get { return EncodingBer; }
}
private void FlushInternal()
{
// Placeholder to support future internal buffering
}
internal void WriteDL(int dl)
{
if (dl < 128)
{
Debug.Assert(dl >= 0);
WriteByte((byte)dl);
return;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Span<byte> encoding = stackalloc byte[5];
BinaryPrimitives.WriteUInt32BigEndian(encoding[1..], (uint)dl);
int leadingZeroBytes = BitOperations.LeadingZeroCount((uint)dl) / 8;
encoding[leadingZeroBytes] = (byte)(0x84 - leadingZeroBytes);
Write(encoding[leadingZeroBytes..]);
#else
byte[] stack = new byte[5];
int pos = stack.Length;
do
{
stack[--pos] = (byte)dl;
dl >>= 8;
}
while (dl > 0);
int count = stack.Length - pos;
stack[--pos] = (byte)(0x80 | count);
Write(stack, pos, count + 1);
#endif
}
internal void WriteIdentifier(int flags, int tagNo)
{
if (tagNo < 31)
{
WriteByte((byte)(flags | tagNo));
return;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Span<byte> stack = stackalloc byte[6];
#else
byte[] stack = new byte[6];
#endif
int pos = stack.Length;
stack[--pos] = (byte)(tagNo & 0x7F);
while (tagNo > 127)
{
tagNo >>= 7;
stack[--pos] = (byte)(tagNo & 0x7F | 0x80);
}
stack[--pos] = (byte)(flags | 0x1F);
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Write(stack[pos..]);
#else
Write(stack, pos, stack.Length - pos);
#endif
}
internal static IAsn1Encoding[] GetContentsEncodings(int encoding, Asn1Encodable[] elements)
{
int count = elements.Length;
IAsn1Encoding[] contentsEncodings = new IAsn1Encoding[count];
for (int i = 0; i < count; ++i)
{
contentsEncodings[i] = elements[i].ToAsn1Object().GetEncoding(encoding);
}
return contentsEncodings;
}
internal static DerEncoding[] GetContentsEncodingsDer(Asn1Encodable[] elements)
{
int count = elements.Length;
DerEncoding[] contentsEncodings = new DerEncoding[count];
for (int i = 0; i < count; ++i)
{
contentsEncodings[i] = elements[i].ToAsn1Object().GetEncodingDer();
}
return contentsEncodings;
}
internal static int GetLengthOfContents(IAsn1Encoding[] contentsEncodings)
{
int contentsLength = 0;
for (int i = 0, count = contentsEncodings.Length; i < count; ++i)
{
contentsLength += contentsEncodings[i].GetLength();
}
return contentsLength;
}
internal static int GetLengthOfDL(int dl)
{
if (dl < 128)
return 1;
int length = 2;
while ((dl >>= 8) > 0)
{
++length;
}
return length;
}
internal static int GetLengthOfEncodingDL(int tagNo, int contentsLength)
{
return GetLengthOfIdentifier(tagNo) + GetLengthOfDL(contentsLength) + contentsLength;
}
internal static int GetLengthOfEncodingIL(int tagNo, IAsn1Encoding contentsEncoding)
{
return GetLengthOfIdentifier(tagNo) + 3 + contentsEncoding.GetLength();
}
internal static int GetLengthOfEncodingIL(int tagNo, IAsn1Encoding[] contentsEncodings)
{
return GetLengthOfIdentifier(tagNo) + 3 + GetLengthOfContents(contentsEncodings);
}
internal static int GetLengthOfIdentifier(int tagNo)
{
if (tagNo < 31)
return 1;
int length = 2;
while ((tagNo >>= 7) > 0)
{
++length;
}
return length;
}
}
}
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