Evidence.cs source code in C# .NET

                        Code:
                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / clr / src / BCL / System / Security / Policy / Evidence.cs / 3 / Evidence.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
//  Evidence.cs 
//
//  Use this class to keep a list of evidence associated with an Assembly 
//

namespace System.Security.Policy {
 
    using System;
    using System.Collections; 
    using System.IO; 
    using System.Configuration.Assemblies;
    using System.Reflection; 
    using System.Runtime.InteropServices;
    using System.Runtime.Remoting;
    using System.Runtime.Serialization;
    using System.Security.Util; 
    using System.Security.Permissions;
    using System.Runtime.Serialization.Formatters.Binary; 
 
    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)] 
    public sealed class Evidence : ICollection
    {
        private IList m_hostList;
        private IList m_assemblyList; 
        private bool m_locked;
 
        public Evidence() 
        {
            m_hostList = null; 
            m_assemblyList = null;
            m_locked = false;
        }
 
        public Evidence(Evidence evidence)
        { 
            if (evidence == null) 
                return;
 
            m_locked = false;
            Merge( evidence );
        }
 
        public Evidence( Object[] hostEvidence, Object[] assemblyEvidence )
        { 
            m_locked = false; 

            if (hostEvidence != null) 
            {
                this.m_hostList = ArrayList.Synchronized( new ArrayList( hostEvidence ) );
            }
 
            if (assemblyEvidence != null)
            { 
                this.m_assemblyList = ArrayList.Synchronized( new ArrayList( assemblyEvidence ) ); 
            }
        } 

        internal Evidence(char[] buffer)
        {
            int position = 0; 
            while (position < buffer.Length)
            { 
                switch (buffer[position++]) 
                {
                    case BuiltInEvidenceHelper.idApplicationDirectory: 
                    {
                        IBuiltInEvidence ad = new ApplicationDirectory();
                        position = ad.InitFromBuffer(buffer, position);
                        AddAssembly(ad); 
                        break;
                    } 
#if !FEATURE_PAL 
                    case BuiltInEvidenceHelper.idPublisher:
                    { 
                        IBuiltInEvidence p = new Publisher();
                        position = p.InitFromBuffer(buffer, position);
                        AddHost(p);
                        break; 
                    }
#endif // !FEATURE_PAL 
                    case BuiltInEvidenceHelper.idStrongName: 
                    {
                        IBuiltInEvidence sn = new StrongName(); 
                        position = sn.InitFromBuffer(buffer, position);
                        AddHost(sn);
                        break;
                    } 
                    case BuiltInEvidenceHelper.idZone:
                    { 
                        IBuiltInEvidence z = new Zone(); 
                        position = z.InitFromBuffer(buffer, position);
                        AddHost(z); 
                        break;
                    }
                    case BuiltInEvidenceHelper.idUrl:
                    { 
                        IBuiltInEvidence u = new Url();
                        position = u.InitFromBuffer(buffer, position); 
                        AddHost(u); 
                        break;
                    } 
                    case BuiltInEvidenceHelper.idSite:
                    {
                        IBuiltInEvidence s = new Site();
                        position = s.InitFromBuffer(buffer, position); 
                        AddHost(s);
                        break; 
                    } 
                    case BuiltInEvidenceHelper.idPermissionRequestEvidence:
                    { 
                        IBuiltInEvidence pre = new PermissionRequestEvidence();
                        position = pre.InitFromBuffer(buffer, position);
                        AddHost(pre);
                        break; 
                    }
#if !FEATURE_PAL 
                    case BuiltInEvidenceHelper.idHash: 
                    {
                        IBuiltInEvidence h = new Hash(); 
                        position = h.InitFromBuffer(buffer, position);
                        AddHost(h);
                        break;
                    } 
#endif // !FEATURE_PAL
                    case BuiltInEvidenceHelper.idGac: 
                    { 
                        IBuiltInEvidence g = new GacInstalled();
                        position = g.InitFromBuffer(buffer, position); 
                        AddHost(g);
                        break;
                    }
                    default: 
                        throw new SerializationException(Environment.GetResourceString("Serialization_UnableToFixup"));
                } // switch 
            } // while 
        }
 
        public void AddHost(Object id)
        {
            if (m_hostList == null)
                m_hostList = ArrayList.Synchronized( new ArrayList() ); 

            if (m_locked) 
                new SecurityPermission( SecurityPermissionFlag.ControlEvidence ).Demand(); 

            m_hostList.Add( id ); 
        }

        public void AddAssembly(Object id)
        { 
            if (m_assemblyList == null)
                m_assemblyList = ArrayList.Synchronized( new ArrayList() ); 
 
            m_assemblyList.Add( id );
        } 

        public bool Locked
        {
            get 
            {
                return m_locked; 
            } 

            set 
            {
                if (!value)
                {
                    new SecurityPermission( SecurityPermissionFlag.ControlEvidence ).Demand(); 

                    m_locked = false; 
                } 
                else
                { 
                    m_locked = true;
                }
            }
        } 

        public void Merge( Evidence evidence ) 
        { 
            IEnumerator enumerator;
 
            if (evidence == null)
                return;

            if (evidence.m_hostList != null) 
            {
                if (m_hostList == null) 
                    m_hostList = ArrayList.Synchronized( new ArrayList() ); 

                if (evidence.m_hostList.Count != 0 && this.m_locked) 
                    new SecurityPermission( SecurityPermissionFlag.ControlEvidence ).Demand();

                enumerator = evidence.m_hostList.GetEnumerator();
                while (enumerator.MoveNext()) 
                {
                    m_hostList.Add( enumerator.Current ); 
                } 
            }
 
            if (evidence.m_assemblyList != null)
            {
                if (m_assemblyList == null)
                    m_assemblyList = ArrayList.Synchronized( new ArrayList() ); 

                enumerator = evidence.m_assemblyList.GetEnumerator(); 
                while (enumerator.MoveNext()) 
                {
                    m_assemblyList.Add( enumerator.Current ); 
                }
            }
        }
 
        // Same as merge, except only one instance of any one evidence type is
        // allowed. When duplicates are found, the evidence in the input 
        // argument will have priority. 
        internal void MergeWithNoDuplicates( Evidence evidence )
        { 
            IEnumerator oldEnumerator, newEnumerator;

            if (evidence == null)
                return; 

            if (evidence.m_hostList != null) 
            { 
                if (m_hostList == null)
                    m_hostList = ArrayList.Synchronized( new ArrayList() ); 

                newEnumerator = evidence.m_hostList.GetEnumerator();
                while (newEnumerator.MoveNext())
                { 
                    Type newItemType = newEnumerator.Current.GetType();
                    oldEnumerator = m_hostList.GetEnumerator(); 
                    while (oldEnumerator.MoveNext()) 
                    {
                        if (oldEnumerator.Current.GetType() == newItemType) 
                        {
                            m_hostList.Remove(oldEnumerator.Current);
                            break;
                        } 
                    }
                    m_hostList.Add( newEnumerator.Current ); 
                } 
            }
 
            if (evidence.m_assemblyList != null)
            {
                if (m_assemblyList == null)
                    m_assemblyList = ArrayList.Synchronized( new ArrayList() ); 

                newEnumerator = evidence.m_assemblyList.GetEnumerator(); 
                while (newEnumerator.MoveNext()) 
                {
                    Type newItemType = newEnumerator.Current.GetType(); 
                    oldEnumerator = m_assemblyList.GetEnumerator();
                    while (oldEnumerator.MoveNext())
                    {
                        if (oldEnumerator.Current.GetType() == newItemType) 
                        {
                            m_assemblyList.Remove(oldEnumerator.Current); 
                            break; 
                        }
                    } 
                    m_assemblyList.Add( newEnumerator.Current );
                }
            }
        } 

        // ICollection implementation 
        public void CopyTo(Array array, int index) 
        {
            int currentIndex = index; 

            if (m_hostList != null)
            {
                m_hostList.CopyTo( array, currentIndex ); 
                currentIndex += m_hostList.Count;
            } 
 
            if (m_assemblyList != null)
            { 
                m_assemblyList.CopyTo( array, currentIndex );
            }
        }
 
        public IEnumerator GetHostEnumerator()
        { 
            if  (m_hostList == null) 
                m_hostList = ArrayList.Synchronized( new ArrayList() );
 
            return m_hostList.GetEnumerator();
        }

        public IEnumerator GetAssemblyEnumerator() 
        {
            if (m_assemblyList == null) 
                m_assemblyList = ArrayList.Synchronized( new ArrayList() ); 

            return m_assemblyList.GetEnumerator(); 
        }

        public IEnumerator GetEnumerator()
        { 
            return new EvidenceEnumerator( this );
        } 
 
        public int Count
        { 
            get { return (m_hostList != null ? m_hostList.Count : 0) + (m_assemblyList != null ? m_assemblyList.Count : 0); }
        }

        public Object SyncRoot 
        {
            get { return this; } 
        } 

        public bool IsSynchronized 
        {
            get { return false; }
        }
 
        public bool IsReadOnly
        { 
            get { return false; } 
        }
 
        internal Evidence Copy()
        {

            // Try the fast way. Will only work if all evidence components implement IBuiltInEvidence 
            char[] serEvidence = PolicyManager.MakeEvidenceArray(this, true);
            if (serEvidence != null) 
            { 
                return new Evidence(serEvidence);
            } 

            // Use the general purpose formatter
            new PermissionSet( true ).Assert();
 
            MemoryStream stream = new MemoryStream();
 
            BinaryFormatter formatter = new BinaryFormatter(); 

            formatter.Serialize( stream, this ); 

            stream.Position = 0;

            return (Evidence)formatter.Deserialize( stream ); 
        }
 
        internal Evidence ShallowCopy() 
        {
            Evidence evidence = new Evidence(); 

            IEnumerator enumerator;

            enumerator = this.GetHostEnumerator(); 

            while (enumerator.MoveNext()) 
            { 
                evidence.AddHost( enumerator.Current );
            } 

            enumerator = this.GetAssemblyEnumerator();

            while (enumerator.MoveNext()) 
            {
                evidence.AddAssembly( enumerator.Current ); 
            } 

            return evidence; 
        }

        [ComVisible(false)]
        public void Clear() 
        {
            m_hostList = null; 
            m_assemblyList = null; 
        }
 
        [ComVisible(false)]
        public void RemoveType(Type t)
        {
            int i; 
            for(i = 0; i < (m_hostList == null ? 0 : m_hostList.Count); i++)
            { 
                if (m_hostList[i].GetType() == t) 
                    m_hostList.RemoveAt(i--);
            } 
            for(i = 0; i < (m_assemblyList == null ? 0 : m_assemblyList.Count); i++)
            {
                if (m_assemblyList[i].GetType() == t)
                    m_assemblyList.RemoveAt(i--); 
            }
        } 
 
        [ComVisible(false)]
        public override bool Equals( Object obj ) 
        {
            Evidence other = obj as Evidence;

            if (other == null) 
                return false;
 
            if (this.m_hostList != null && other.m_hostList != null) 
            {
                if (this.m_hostList.Count != other.m_hostList.Count) 
                    return false;

                int count = this.m_hostList.Count;
                for (int i = 0; i < count; ++i) 
                {
                    bool found = false; 
 
                    for (int j = 0; j < count; ++j)
                    { 
                        if (Object.Equals( this.m_hostList[i], other.m_hostList[j] ))
                        {
                            found = true;
                            break; 
                        }
                    } 
 
                    if (!found)
                        return false; 
                }
            }
            else if (this.m_hostList != null || other.m_hostList != null)
            { 
                return false;
            } 
 
            if (this.m_assemblyList != null && other.m_assemblyList != null)
            { 
                if (this.m_assemblyList.Count != other.m_assemblyList.Count)
                    return false;

                int count = this.m_assemblyList.Count; 
                for (int i = 0; i < count; ++i)
                { 
                    bool found = false; 

                    for (int j = 0; j < count; ++j) 
                    {
                        if (Object.Equals( m_assemblyList[i], other.m_assemblyList[j] ))
                        {
                            found = true; 
                            break;
                        } 
                    } 

                    if (!found) 
                        return false;
                }
            }
            else if (this.m_assemblyList != null || other.m_assemblyList != null) 
            {
                return false; 
            } 

            return true; 
        }

        [ComVisible(false)]
        public override int GetHashCode() 
        {
            int accumulator = 0; 
 
            if (this.m_hostList != null)
            { 
                int count = this.m_hostList.Count;
                for (int i = 0; i < count; ++i)
                {
                    accumulator = accumulator ^ this.m_hostList[i].GetHashCode(); 
                }
            } 
 
            if (this.m_assemblyList != null)
            { 
                int count = this.m_assemblyList.Count;
                for (int i = 0; i < count; ++i)
                {
                    accumulator = accumulator ^ this.m_assemblyList[i].GetHashCode(); 
                }
            } 
 
            return accumulator;
        } 

        internal Object FindType(Type t)
        {
            int i; 
            for(i = 0; i < (m_hostList == null ? 0 : m_hostList.Count); i++)
            { 
                if (m_hostList[i].GetType() == t) 
                    return m_hostList[i];
            } 
            for(i = 0; i < (m_assemblyList == null ? 0 : m_assemblyList.Count); i++)
            {
                if (m_assemblyList[i].GetType() == t)
                    return m_hostList[i]; 
            }
            return null; 
        } 

        ///  
        ///     Mark all of the evidence in the collection as having been used
        /// 
        internal void MarkAllEvidenceAsUsed()
        { 
            foreach (object o in this)
            { 
                IDelayEvaluatedEvidence delayEvidence = o as IDelayEvaluatedEvidence; 
                if (delayEvidence != null)
                { 
                    delayEvidence.MarkUsed();
                }
            }
        } 

        ///  
        ///     Determine if delay evaluated strong name evidence is contained in this collection, and if so 
        ///     if it was used during policy evaluation.
        /// 
        ///     This method is called from the VM in SecurityPolicy::WasStrongNameEvidenceUsed
        /// 
        private bool WasStrongNameEvidenceUsed()
        { 
            IDelayEvaluatedEvidence snEvidence = FindType(typeof(StrongName)) as IDelayEvaluatedEvidence;
 
            return snEvidence != null && snEvidence.WasUsed; 
        }
    } 

    sealed class EvidenceEnumerator : IEnumerator
    {
        private bool m_first; 
        private Evidence m_evidence;
        private IEnumerator m_enumerator; 
 
        public EvidenceEnumerator( Evidence evidence )
        { 
            this.m_evidence = evidence;
            Reset();
        }
 
        public bool MoveNext()
        { 
            if (m_enumerator == null) 
            {
                return false; 
            }

            if (!m_enumerator.MoveNext())
            { 
                if (m_first)
                { 
                    m_enumerator = m_evidence.GetAssemblyEnumerator(); 
                    m_first = false;
                    if (m_enumerator != null) 
                        return m_enumerator.MoveNext();
                    else
                        return false;
                } 
                else
                { 
                    return false; 
                }
            } 
            return true;
        }

        public Object Current 
        {
            get { 
                if (m_enumerator == null) 
                    return null;
                else 
                    return m_enumerator.Current;
            }
        }
 
        public void Reset() {
            this.m_first = true; 
 
            if (m_evidence != null)
            { 
                m_enumerator = m_evidence.GetHostEnumerator();
            }
            else
            { 
                m_enumerator = null;
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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Evidence.cs source code in C# .NET

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