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using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1
{
public class DerObjectIdentifier
: Asn1Object
{
private static readonly Regex OidRegex = new Regex(@"\A[0-2](\.[0-9]+)+\z");
private readonly string identifier;
/**
* return an Oid from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerObjectIdentifier GetInstance(
object obj)
{
if (obj == null || obj is DerObjectIdentifier)
{
return (DerObjectIdentifier) obj;
}
throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name, "obj");
}
/**
* return an object Identifier from a tagged object.
*
* @param obj the tagged object holding the object we want
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the tagged object cannot
* be converted.
*/
public static DerObjectIdentifier GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(obj.GetObject());
}
public DerObjectIdentifier(
string identifier)
{
if (identifier == null)
throw new ArgumentNullException("identifier");
if (!OidRegex.IsMatch(identifier))
throw new FormatException("string " + identifier + " not an OID");
this.identifier = identifier;
}
// TODO Change to ID?
public string Id
{
get { return identifier; }
}
public virtual DerObjectIdentifier Branch(string branchID)
{
return new DerObjectIdentifier(identifier + "." + branchID);
}
/**
* Return true if this oid is an extension of the passed in branch, stem.
* @param stem the arc or branch that is a possible parent.
* @return true if the branch is on the passed in stem, false otherwise.
*/
public virtual bool On(DerObjectIdentifier stem)
{
string id = Id, stemId = stem.Id;
return id.Length > stemId.Length && id[stemId.Length] == '.' && id.StartsWith(stemId);
}
internal DerObjectIdentifier(
byte[] bytes)
: this(MakeOidStringFromBytes(bytes))
{
}
private void WriteField(
Stream outputStream,
long fieldValue)
{
byte[] result = new byte[9];
int pos = 8;
result[pos] = (byte)(fieldValue & 0x7f);
while (fieldValue >= (1L << 7))
{
fieldValue >>= 7;
result[--pos] = (byte)((fieldValue & 0x7f) | 0x80);
}
outputStream.Write(result, pos, 9 - pos);
}
private void WriteField(
Stream outputStream,
BigInteger fieldValue)
{
int byteCount = (fieldValue.BitLength + 6) / 7;
if (byteCount == 0)
{
outputStream.WriteByte(0);
}
else
{
BigInteger tmpValue = fieldValue;
byte[] tmp = new byte[byteCount];
for (int i = byteCount-1; i >= 0; i--)
{
tmp[i] = (byte) ((tmpValue.IntValue & 0x7f) | 0x80);
tmpValue = tmpValue.ShiftRight(7);
}
tmp[byteCount-1] &= 0x7f;
outputStream.Write(tmp, 0, tmp.Length);
}
}
internal override void Encode(
DerOutputStream derOut)
{
OidTokenizer tok = new OidTokenizer(identifier);
MemoryStream bOut = new MemoryStream();
DerOutputStream dOut = new DerOutputStream(bOut);
string token = tok.NextToken();
int first = int.Parse(token);
token = tok.NextToken();
int second = int.Parse(token);
WriteField(bOut, first * 40 + second);
while (tok.HasMoreTokens)
{
token = tok.NextToken();
if (token.Length < 18)
{
WriteField(bOut, Int64.Parse(token));
}
else
{
WriteField(bOut, new BigInteger(token));
}
}
dOut.Dispose();
derOut.WriteEncoded(Asn1Tags.ObjectIdentifier, bOut.ToArray());
}
protected override int Asn1GetHashCode()
{
return identifier.GetHashCode();
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerObjectIdentifier other = asn1Object as DerObjectIdentifier;
if (other == null)
return false;
return this.identifier.Equals(other.identifier);
}
public override string ToString()
{
return identifier;
}
private static string MakeOidStringFromBytes(
byte[] bytes)
{
StringBuilder objId = new StringBuilder();
long value = 0;
BigInteger bigValue = null;
bool first = true;
for (int i = 0; i != bytes.Length; i++)
{
int b = bytes[i];
if (value < 0x80000000000000L)
{
value = value * 128 + (b & 0x7f);
if ((b & 0x80) == 0) // end of number reached
{
if (first)
{
switch ((int)value / 40)
{
case 0:
objId.Append('0');
break;
case 1:
objId.Append('1');
value -= 40;
break;
default:
objId.Append('2');
value -= 80;
break;
}
first = false;
}
objId.Append('.');
objId.Append(value);
value = 0;
}
}
else
{
if (bigValue == null)
{
bigValue = BigInteger.ValueOf(value);
}
bigValue = bigValue.ShiftLeft(7);
bigValue = bigValue.Or(BigInteger.ValueOf(b & 0x7f));
if ((b & 0x80) == 0)
{
objId.Append('.');
objId.Append(bigValue);
bigValue = null;
value = 0;
}
}
}
return objId.ToString();
}
}
}
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