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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
*/
public class DerNumericString
: DerStringBase
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerNumericString), Asn1Tags.NumericString) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
/**
* return a numeric string from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerNumericString GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is DerNumericString derNumericString)
return derNumericString;
if (obj is IAsn1Convertible asn1Convertible)
{
if (!(obj is Asn1Object) && asn1Convertible.ToAsn1Object() is DerNumericString converted)
return converted;
}
else if (obj is byte[] bytes)
{
try
{
return (DerNumericString)Meta.Instance.FromByteArray(bytes);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct numeric string from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a numeric 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 DerNumericString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerNumericString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly byte[] m_contents;
public DerNumericString(string str)
: this(str, false)
{
}
/**
* Constructor with optional validation.
*
* @param string the base string to wrap.
* @param validate whether or not to check the string.
* @throws ArgumentException if validate is true and the string
* contains characters that should not be in a NumericString.
*/
public DerNumericString(string str, bool validate)
{
if (str == null)
throw new ArgumentNullException("str");
if (validate && !IsNumericString(str))
throw new ArgumentException("string contains illegal characters", "str");
m_contents = Strings.ToAsciiByteArray(str);
}
public DerNumericString(byte[] contents)
: this(contents, true)
{
}
internal DerNumericString(byte[] contents, bool clone)
{
if (null == contents)
throw new ArgumentNullException("contents");
m_contents = clone ? Arrays.Clone(contents) : contents;
}
public override string GetString()
{
return Strings.FromAsciiByteArray(m_contents);
}
public byte[] GetOctets()
{
return Arrays.Clone(m_contents);
}
internal override IAsn1Encoding GetEncoding(int encoding)
{
return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.NumericString, 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.NumericString, m_contents);
}
internal sealed override DerEncoding GetEncodingDerImplicit(int tagClass, int tagNo)
{
return new PrimitiveDerEncoding(tagClass, tagNo, m_contents);
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
DerNumericString that = asn1Object as DerNumericString;
return null != that
&& Arrays.AreEqual(this.m_contents, that.m_contents);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(m_contents);
}
/**
* Return true if the string can be represented as a NumericString ('0'..'9', ' ')
*
* @param str string to validate.
* @return true if numeric, fale otherwise.
*/
public static bool IsNumericString(string str)
{
foreach (char ch in str)
{
if (ch > 0x007f || (ch != ' ' && !char.IsDigit(ch)))
return false;
}
return true;
}
internal static bool IsNumericString(byte[] contents)
{
for (int i = 0; i < contents.Length; ++i)
{
switch (contents[i])
{
case 0x20:
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
break;
default:
return false;
}
}
return true;
}
internal static DerNumericString CreatePrimitive(byte[] contents)
{
// TODO Validation - sort out exception types
//if (!IsNumericString(contents))
return new DerNumericString(contents, false);
}
}
}
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