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using System;
using System.Text;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der IA5String object - this is an ascii string.
*/
public class DerIA5String
: DerStringBase
{
private readonly string str;
/**
* return a IA5 string from the passed in object
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerIA5String GetInstance(
object obj)
{
if (obj == null || obj is DerIA5String)
{
return (DerIA5String)obj;
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return an IA5 string 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 DerIA5String GetInstance(
Asn1TaggedObject obj,
bool isExplicit)
{
Asn1Object o = obj.GetObject();
if (isExplicit || o is DerIA5String)
{
return GetInstance(o);
}
return new DerIA5String(((Asn1OctetString)o).GetOctets());
}
/**
* basic constructor - with bytes.
*/
public DerIA5String(
byte[] str)
: this(Strings.FromAsciiByteArray(str), false)
{
}
/**
* basic constructor - without validation.
*/
public DerIA5String(
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 an IA5String.
*/
public DerIA5String(
string str,
bool validate)
{
if (str == null)
throw new ArgumentNullException("str");
if (validate && !IsIA5String(str))
throw new ArgumentException("string contains illegal characters", "str");
this.str = str;
}
public override string GetString()
{
return str;
}
public byte[] GetOctets()
{
return Strings.ToAsciiByteArray(str);
}
internal override int EncodedLength(bool withID)
{
return Asn1OutputStream.GetLengthOfEncodingDL(withID, str.Length);
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
asn1Out.WriteEncodingDL(withID, Asn1Tags.IA5String, GetOctets());
}
protected override int Asn1GetHashCode()
{
return this.str.GetHashCode();
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerIA5String other = asn1Object as DerIA5String;
if (other == null)
return false;
return this.str.Equals(other.str);
}
/**
* return true if the passed in String can be represented without
* loss as an IA5String, false otherwise.
*
* @return true if in printable set, false otherwise.
*/
public static bool IsIA5String(
string str)
{
foreach (char ch in str)
{
if (ch > 0x007f)
{
return false;
}
}
return true;
}
}
}
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