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using System;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
public class Asn1OutputStream
: DerOutputStream
{
public static Asn1OutputStream Create(Stream output)
{
return new Asn1OutputStream(output);
}
public static Asn1OutputStream Create(Stream output, string encoding)
{
if (Asn1Encodable.Der.Equals(encoding))
{
return new DerOutputStreamNew(output);
}
else
{
return new Asn1OutputStream(output);
}
}
[Obsolete("Use static Create method(s)")]
public Asn1OutputStream(Stream os)
: base(os)
{
}
public override void WriteObject(Asn1Encodable encodable)
{
if (null == encodable)
throw new IOException("null object detected");
WritePrimitive(encodable.ToAsn1Object(), true);
FlushInternal();
}
public override void WriteObject(Asn1Object primitive)
{
if (null == primitive)
throw new IOException("null object detected");
WritePrimitive(primitive, true);
FlushInternal();
}
internal void FlushInternal()
{
// Placeholder to support future internal buffering
}
internal virtual bool IsBer
{
get { return true; }
}
internal virtual bool IsDer
{
get { return false; }
}
internal void WriteDL(int length)
{
if (length < 128)
{
WriteByte((byte)length);
}
else
{
byte[] stack = new byte[5];
int pos = stack.Length;
do
{
stack[--pos] = (byte)length;
length >>= 8;
}
while (length > 0);
int count = stack.Length - pos;
stack[--pos] = (byte)(0x80 | count);
Write(stack, pos, count + 1);
}
}
internal virtual void WriteElements(Asn1Encodable[] elements)
{
for (int i = 0, count = elements.Length; i < count; ++i)
{
elements[i].ToAsn1Object().Encode(this, true);
}
}
internal void WriteEncodingDL(bool withID, int identifier, byte contents)
{
WriteIdentifier(withID, identifier);
WriteDL(1);
WriteByte(contents);
}
internal void WriteEncodingDL(bool withID, int identifier, byte[] contents)
{
WriteIdentifier(withID, identifier);
WriteDL(contents.Length);
Write(contents, 0, contents.Length);
}
internal void WriteEncodingDL(bool withID, int identifier, byte[] contents, int contentsOff, int contentsLen)
{
WriteIdentifier(withID, identifier);
WriteDL(contentsLen);
Write(contents, contentsOff, contentsLen);
}
internal void WriteEncodingDL(bool withID, int identifier, byte contentsPrefix, byte[] contents,
int contentsOff, int contentsLen)
{
WriteIdentifier(withID, identifier);
WriteDL(1 + contentsLen);
WriteByte(contentsPrefix);
Write(contents, contentsOff, contentsLen);
}
internal void WriteEncodingDL(bool withID, int identifier, byte[] contents, int contentsOff, int contentsLen,
byte contentsSuffix)
{
WriteIdentifier(withID, identifier);
WriteDL(contentsLen + 1);
Write(contents, contentsOff, contentsLen);
WriteByte(contentsSuffix);
}
internal void WriteEncodingDL(bool withID, int flags, int tag, byte[] contents)
{
WriteIdentifier(withID, flags, tag);
WriteDL(contents.Length);
Write(contents, 0, contents.Length);
}
internal void WriteEncodingIL(bool withID, int identifier, Asn1Encodable[] elements)
{
WriteIdentifier(withID, identifier);
WriteByte(0x80);
WriteElements(elements);
WriteByte(0x00);
WriteByte(0x00);
}
internal void WriteIdentifier(bool withID, int identifier)
{
if (withID)
{
WriteByte((byte)identifier);
}
}
internal void WriteIdentifier(bool withID, int flags, int tag)
{
if (!withID)
{
// Don't write the identifier
}
else if (tag < 31)
{
WriteByte((byte)(flags | tag));
}
else
{
byte[] stack = new byte[6];
int pos = stack.Length;
stack[--pos] = (byte)(tag & 0x7F);
while (tag > 127)
{
tag >>= 7;
stack[--pos] = (byte)(tag & 0x7F | 0x80);
}
stack[--pos] = (byte)(flags | 0x1F);
Write(stack, pos, stack.Length - pos);
}
}
internal virtual void WritePrimitive(Asn1Object primitive, bool withID)
{
primitive.Encode(this, withID);
}
internal virtual void WritePrimitives(Asn1Object[] primitives)
{
for (int i = 0, count = primitives.Length; i < count; ++i)
{
WritePrimitive(primitives[i], true);
}
}
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(bool withID, int contentsLength)
{
return (withID ? 1 : 0) + GetLengthOfDL(contentsLength) + contentsLength;
}
internal static int GetLengthOfEncodingDL(bool withID, int tag, int contentsLength)
{
return (withID ? GetLengthOfIdentifier(tag) : 0) + GetLengthOfDL(contentsLength) + contentsLength;
}
internal static int GetLengthOfIdentifier(int tag)
{
if (tag < 31)
return 1;
int length = 2;
while ((tag >>= 7) > 0)
{
++length;
}
return length;
}
}
}
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