kopia lustrzana https://github.com/dl2alf/AirScout
192 wiersze
5.7 KiB
C#
192 wiersze
5.7 KiB
C#
using System;
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using System.IO;
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using Org.BouncyCastle.Utilities;
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namespace Org.BouncyCastle.Asn1
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{
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/**
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* Der NumericString object - this is an ascii string of characters {0,1,2,3,4,5,6,7,8,9, }.
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*/
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public class DerNumericString
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: DerStringBase
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{
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internal class Meta : Asn1UniversalType
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{
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internal static readonly Asn1UniversalType Instance = new Meta();
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private Meta() : base(typeof(DerNumericString), Asn1Tags.NumericString) {}
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internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
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{
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return CreatePrimitive(octetString.GetOctets());
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}
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}
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/**
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* return a numeric string from the passed in object
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*
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* @exception ArgumentException if the object cannot be converted.
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*/
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public static DerNumericString GetInstance(object obj)
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{
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if (obj == null || obj is DerNumericString)
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{
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return (DerNumericString)obj;
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}
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else if (obj is IAsn1Convertible)
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{
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Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
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if (asn1Object is DerNumericString)
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return (DerNumericString)asn1Object;
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}
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else if (obj is byte[])
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{
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try
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{
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return (DerNumericString)Meta.Instance.FromByteArray((byte[])obj);
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}
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catch (IOException e)
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{
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throw new ArgumentException("failed to construct numeric string from byte[]: " + e.Message);
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}
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}
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throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
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}
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/**
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* return a numeric string from a tagged object.
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*
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* @param taggedObject the tagged object holding the object we want
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* @param declaredExplicit true if the object is meant to be explicitly tagged false otherwise.
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* @exception ArgumentException if the tagged object cannot be converted.
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*/
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public static DerNumericString GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
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{
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return (DerNumericString)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
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}
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private readonly byte[] m_contents;
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public DerNumericString(string str)
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: this(str, false)
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{
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}
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/**
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* Constructor with optional validation.
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*
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* @param string the base string to wrap.
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* @param validate whether or not to check the string.
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* @throws ArgumentException if validate is true and the string
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* contains characters that should not be in a NumericString.
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*/
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public DerNumericString(string str, bool validate)
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{
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if (str == null)
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throw new ArgumentNullException("str");
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if (validate && !IsNumericString(str))
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throw new ArgumentException("string contains illegal characters", "str");
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m_contents = Strings.ToAsciiByteArray(str);
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}
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public DerNumericString(byte[] contents)
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: this(contents, true)
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{
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}
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internal DerNumericString(byte[] contents, bool clone)
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{
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if (null == contents)
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throw new ArgumentNullException("contents");
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m_contents = clone ? Arrays.Clone(contents) : contents;
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}
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public override string GetString()
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{
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return Strings.FromAsciiByteArray(m_contents);
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}
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public byte[] GetOctets()
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{
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return Arrays.Clone(m_contents);
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}
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internal override IAsn1Encoding GetEncoding(int encoding)
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{
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return new PrimitiveEncoding(Asn1Tags.Universal, Asn1Tags.NumericString, m_contents);
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}
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internal override IAsn1Encoding GetEncodingImplicit(int encoding, int tagClass, int tagNo)
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{
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return new PrimitiveEncoding(tagClass, tagNo, m_contents);
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}
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protected override bool Asn1Equals(Asn1Object asn1Object)
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{
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DerNumericString that = asn1Object as DerNumericString;
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return null != that
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&& Arrays.AreEqual(this.m_contents, that.m_contents);
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}
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protected override int Asn1GetHashCode()
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{
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return Arrays.GetHashCode(m_contents);
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}
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/**
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* Return true if the string can be represented as a NumericString ('0'..'9', ' ')
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*
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* @param str string to validate.
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* @return true if numeric, fale otherwise.
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*/
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public static bool IsNumericString(string str)
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{
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foreach (char ch in str)
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{
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if (ch > 0x007f || (ch != ' ' && !char.IsDigit(ch)))
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return false;
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}
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return true;
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}
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internal static bool IsNumericString(byte[] contents)
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{
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for (int i = 0; i < contents.Length; ++i)
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{
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switch (contents[i])
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{
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case 0x20:
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case 0x30:
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case 0x31:
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case 0x32:
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case 0x33:
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case 0x34:
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case 0x35:
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case 0x36:
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case 0x37:
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case 0x38:
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case 0x39:
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break;
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default:
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return false;
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}
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}
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return true;
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}
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internal static DerNumericString CreatePrimitive(byte[] contents)
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{
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// TODO Validation - sort out exception types
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//if (!IsNumericString(contents))
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return new DerNumericString(contents, false);
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}
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}
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}
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