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using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* UniversalString object.
*/
public class DerUniversalString
: DerStringBase
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerUniversalString), Asn1Tags.UniversalString) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
private static readonly char[] table = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
/**
* return a universal string from the passed in object.
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerUniversalString GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is DerUniversalString derUniversalString)
return derUniversalString;
if (obj is IAsn1Convertible asn1Convertible && !(obj is Asn1Object))
{
Asn1Object asn1Object = asn1Convertible.ToAsn1Object();
if (asn1Object is DerUniversalString converted)
return converted;
}
else if (obj is byte[] bytes)
{
try
{
return (DerUniversalString)Meta.Instance.FromByteArray(bytes);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct universal string from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a universal string from a tagged object.
*
* @param taggedObject the tagged object holding the object we want
* @param declaredExplicit true if the object is meant to be explicitly tagged false otherwise.
* @exception ArgumentException if the tagged object cannot be converted.
*/
public static DerUniversalString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerUniversalString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly byte[] m_contents;
public DerUniversalString(byte[] contents)
: this(contents, true)
{
}
internal DerUniversalString(byte[] contents, bool clone)
{
if (null == contents)
throw new ArgumentNullException("contents");
m_contents = clone ? Arrays.Clone(contents) : contents;
}
public override string GetString()
{
int dl = m_contents.Length;
int capacity = 3 + 2 * (Asn1OutputStream.GetLengthOfDL(dl) + dl);
StringBuilder buf = new StringBuilder("#1C", capacity);
EncodeHexDL(buf, dl);
for (int i = 0; i < dl; ++i)
{
EncodeHexByte(buf, m_contents[i]);
}
Debug.Assert(buf.Length == capacity);
return buf.ToString();
}
public byte[] GetOctets()
{
return Arrays.Clone(m_contents);
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.UniversalString, m_contents);
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, m_contents);
}
internal sealed override DerEncoding GetEncodingDer()
{
return new PrimitiveDerEncoding(Asn1Tags.Universal, Asn1Tags.UniversalString, m_contents);
}
internal sealed override DerEncoding GetEncodingDerImplicit(int tagClass, int tagNo)
{
return new PrimitiveDerEncoding(tagClass, tagNo, m_contents);
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
DerUniversalString that = asn1Object as DerUniversalString;
return null != that
&& Arrays.AreEqual(this.m_contents, that.m_contents);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(m_contents);
}
internal static DerUniversalString CreatePrimitive(byte[] contents)
{
return new DerUniversalString(contents, false);
}
private static void EncodeHexByte(StringBuilder buf, int i)
{
buf.Append(table[(i >> 4) & 0xF]);
buf.Append(table[i & 0xF]);
}
private static void EncodeHexDL(StringBuilder buf, int dl)
{
if (dl < 128)
{
EncodeHexByte(buf, dl);
return;
}
byte[] stack = new byte[5];
int pos = 5;
do
{
stack[--pos] = (byte)dl;
dl >>= 8;
}
while (dl != 0);
int count = stack.Length - pos;
stack[--pos] = (byte)(0x80 | count);
do
{
EncodeHexByte(buf, stack[pos++]);
}
while (pos < stack.Length);
}
}
}
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