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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* Der PrintableString object.
*/
public class DerPrintableString
: DerStringBase
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta() : base(typeof(DerPrintableString), Asn1Tags.PrintableString) {}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
/**
* return a printable string from the passed in object.
*
* @exception ArgumentException if the object cannot be converted.
*/
public static DerPrintableString GetInstance(object obj)
{
if (obj == null || obj is DerPrintableString)
{
return (DerPrintableString)obj;
}
else if (obj is IAsn1Convertible)
{
Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
if (asn1Object is DerPrintableString)
return (DerPrintableString)asn1Object;
}
else if (obj is byte[])
{
try
{
return (DerPrintableString)Meta.Instance.FromByteArray((byte[])obj);
}
catch (IOException e)
{
throw new ArgumentException("failed to construct printable string from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
/**
* return a printable 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 DerPrintableString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (DerPrintableString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
private readonly byte[] m_contents;
public DerPrintableString(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 PrintableString.
*/
public DerPrintableString(string str, bool validate)
{
if (str == null)
throw new ArgumentNullException("str");
if (validate && !IsPrintableString(str))
throw new ArgumentException("string contains illegal characters", "str");
m_contents = Strings.ToAsciiByteArray(str);
}
public DerPrintableString(byte[] contents)
: this(contents, true)
{
}
internal DerPrintableString(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.PrintableString, m_contents);
}
internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
{
return new PrimitiveEncoding(tagClass, tagNo, m_contents);
}
protected override bool Asn1Equals(
Asn1Object asn1Object)
{
DerPrintableString that = asn1Object as DerPrintableString;
return null != that
&& Arrays.AreEqual(this.m_contents, that.m_contents);
}
protected override int Asn1GetHashCode()
{
return Arrays.GetHashCode(m_contents);
}
/**
* return true if the passed in String can be represented without
* loss as a PrintableString, false otherwise.
*
* @return true if in printable set, false otherwise.
*/
public static bool IsPrintableString(string str)
{
foreach (char ch in str)
{
if (ch > 0x007f)
return false;
if (char.IsLetterOrDigit(ch))
continue;
// if (char.IsPunctuation(ch))
// continue;
switch (ch)
{
case ' ':
case '\'':
case '(':
case ')':
case '+':
case '-':
case '.':
case ':':
case '=':
case '?':
case '/':
case ',':
continue;
}
return false;
}
return true;
}
internal static DerPrintableString CreatePrimitive(byte[] contents)
{
return new DerPrintableString(contents, false);
}
}
}
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