SecurityDocument.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / SecurityDocument.cs / 1 / SecurityDocument.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
//----------------------------------------------------------------------------
// 
// CLASS:    SecurityDocument.cs 
//
// PURPOSE:  Represent an XML document 
//
//
//---------------------------------------------------------------------------
 
namespace System.Security
{ 
    using System; 
    using System.Collections;
    using System.Security.Util; 
    using System.Text;
    using System.Globalization;
    using System.IO;
    using StringMaker = System.Security.Util.Tokenizer.StringMaker; 

    [Serializable] 
    sealed internal class SecurityDocumentElement : ISecurityElementFactory 
    {
        private int m_position; 
        private SecurityDocument m_document;

        internal SecurityDocumentElement( SecurityDocument document, int position )
        { 
            m_document = document;
            m_position = position; 
        } 

        SecurityElement ISecurityElementFactory.CreateSecurityElement() 
        {
            return m_document.GetElement( m_position, true );
        }
 
        Object ISecurityElementFactory.Copy()
        { 
            return new SecurityDocumentElement( m_document, m_position ); 
        }
 
        String ISecurityElementFactory.GetTag()
        {
            return m_document.GetTagForElement( m_position );
        } 

        String ISecurityElementFactory.Attribute( String attributeName ) 
        { 
            return m_document.GetAttributeForElement( m_position, attributeName );
        } 

    }

 
    [Serializable]
    sealed internal class SecurityDocument 
    { 
        internal byte[] m_data;
 
        internal const byte c_element = 1;
        internal const byte c_attribute = 2;
        internal const byte c_text = 3;
        internal const byte c_children = 4; 
        internal const int c_growthSize = 32;
 
        public SecurityDocument( int numData ) 
        {
            m_data = new byte[numData]; 
        }

        public SecurityDocument( byte[] data )
        { 
            this.m_data = data;
        } 
 
        public SecurityDocument( SecurityElement elRoot )
        { 
            m_data = new byte[c_growthSize];

            int position = 0;
            ConvertElement( elRoot, ref position ); 
        }
 
        public void GuaranteeSize( int size ) 
        {
            if (m_data.Length < size) 
            {
                byte[] m_newData = new byte[((size / c_growthSize) + 1) * c_growthSize];
                Array.Copy( m_data, 0, m_newData, 0, m_data.Length );
                m_data = m_newData; 
            }
        } 
 
        public void AddString( String str, ref int position )
        { 
            // @

            GuaranteeSize( position + str.Length * 2 + 2 );
 
            for (int i = 0; i < str.Length; ++i)
            { 
                m_data[position+(2*i)] = (byte)(str[i] >> 8); 
                m_data[position+(2*i)+1] = (byte)(str[i] & 0x00FF);
            } 
            m_data[position + str.Length * 2] = 0;
            m_data[position + str.Length * 2 + 1] = 0;

            position += str.Length * 2 + 2; 
        }
 
        public void AppendString( String str, ref int position ) 
        {
            if (position <= 1 || 
                m_data[position - 1] != 0 ||
                m_data[position - 2] != 0 )
                throw new XmlSyntaxException();
 
            position -= 2;
 
            AddString( str, ref position ); 
        }
 
        public static int EncodedStringSize( String str )
        {
            return str.Length * 2 + 2;
        } 

        public String GetString( ref int position ) 
        { 
            return GetString( ref position, true );
        } 

        public String GetString( ref int position, bool bCreate )
        {
            int stringEnd; 
            bool bFoundEnd = false;
            for (stringEnd = position; stringEnd < m_data.Length-1; stringEnd += 2) 
            { 
                if (m_data[stringEnd] == 0 && m_data[stringEnd + 1] == 0)
                { 
                    bFoundEnd = true;
                    break;
                }
            } 

            BCLDebug.Assert(bFoundEnd, "Malformed string in parse data"); 
 
            StringMaker m = System.SharedStatics.GetSharedStringMaker();
 
            try
            {

                if (bCreate) 
                {
                    m._outStringBuilder = null; 
                    m._outIndex = 0; 

                    for (int i = position; i < stringEnd; i += 2) 
                    {
                        char c = (char)(m_data[i] << 8 | m_data[i+1]);

                        // add character  to the string 
                        if (m._outIndex < StringMaker.outMaxSize)
                        { 
                            // easy case 
                            m._outChars[m._outIndex++] = c;
                        } 
                        else
                        {
                            if (m._outStringBuilder == null)
                            { 
                                // OK, first check if we have to init the StringBuilder
                                m._outStringBuilder = new StringBuilder(); 
                            } 

                            // OK, copy from _outChars to _outStringBuilder 
                            m._outStringBuilder.Append(m._outChars, 0, StringMaker.outMaxSize);

                            // reset _outChars pointer
                            m._outChars[0] = c; 
                            m._outIndex = 1;
                        } 
                    } 
                }
 
                position = stringEnd + 2;

                if (bCreate)
                    return m.MakeString(); 
                else
                    return null; 
            } 
            finally
            { 
                System.SharedStatics.ReleaseSharedStringMaker(ref m);
            }
        }
 

        public void AddToken( byte b, ref int position ) 
        { 
            GuaranteeSize( position + 1 );
            m_data[position++] = b; 
        }

        public void ConvertElement( SecurityElement elCurrent, ref int position )
        { 
            AddToken( c_element, ref position );
            AddString( elCurrent.m_strTag, ref position ); 
 
            if (elCurrent.m_lAttributes != null)
            { 
                for (int i = 0; i < elCurrent.m_lAttributes.Count; i+=2)
                {
                    AddToken( c_attribute, ref position );
                    AddString( (String)elCurrent.m_lAttributes[i], ref position ); 
                    AddString( (String)elCurrent.m_lAttributes[i+1], ref position );
                } 
            } 

            if (elCurrent.m_strText != null) 
            {
                AddToken( c_text, ref position );
                AddString( elCurrent.m_strText, ref position );
            } 

            if (elCurrent.InternalChildren != null) 
            { 
                for (int i = 0; i < elCurrent.InternalChildren.Count; ++i)
                { 
                    ConvertElement( (SecurityElement)elCurrent.Children[i], ref position );
                }
            }
            AddToken( c_children, ref position ); 
        }
 
        public SecurityElement GetRootElement() 
        {
            return GetElement( 0, true ); 
        }

        public SecurityElement GetElement( int position, bool bCreate )
        { 
            SecurityElement elRoot = InternalGetElement( ref position, bCreate );
            return elRoot; 
        } 

        internal SecurityElement InternalGetElement( ref int position, bool bCreate ) 
        {
            if (m_data.Length <= position)
                throw new XmlSyntaxException();
 
            if (m_data[position++] != c_element)
                throw new XmlSyntaxException(); 
 
            SecurityElement elCurrent = null;
            String strTag = GetString( ref position, bCreate ); 
            if (bCreate)
                elCurrent = new SecurityElement( strTag );

            while (m_data[position] == c_attribute) 
            {
                position++; 
                String strName = GetString( ref position, bCreate ); 
                String strValue = GetString( ref position, bCreate );
                if (bCreate) 
                    elCurrent.AddAttribute( strName, strValue );
            }

            if (m_data[position] == c_text) 
            {
                position++; 
                String strText = GetString( ref position, bCreate ); 
                if (bCreate)
                    elCurrent.m_strText = strText; 
            }

            while (m_data[position] != c_children)
            { 
                SecurityElement elChild = InternalGetElement( ref position, bCreate );
                if (bCreate) 
                    elCurrent.AddChild( elChild ); 
            }
            position++; 

            return elCurrent;
        }
 
        public String GetTagForElement( int position )
        { 
            if (m_data.Length <= position) 
                throw new XmlSyntaxException();
 
            if (m_data[position++] != c_element)
                throw new XmlSyntaxException();

            String strTag = GetString( ref position ); 
            return strTag;
        } 
 
        public ArrayList GetChildrenPositionForElement( int position )
        { 
            if (m_data.Length <= position)
                throw new XmlSyntaxException();

            if (m_data[position++] != c_element) 
                throw new XmlSyntaxException();
 
            ArrayList children = new ArrayList(); 

            // This is to move past the tag string 
            GetString( ref position );

            while (m_data[position] == c_attribute)
            { 
                position++;
                // Read name and value, then throw them away 
                GetString( ref position, false ); 
                GetString( ref position, false );
            } 

            if (m_data[position] == c_text)
            {
                position++; 
                // Read text, then throw it away.
                GetString( ref position, false ); 
            } 

            while (m_data[position] != c_children) 
            {
                children.Add( position );
                InternalGetElement( ref position, false );
            } 
            position++;
 
            return children; 
        }
 
        public String GetAttributeForElement( int position, String attributeName )
        {
            if (m_data.Length <= position)
                throw new XmlSyntaxException(); 

            if (m_data[position++] != c_element) 
                throw new XmlSyntaxException(); 

            String strRetValue = null; 
            // This is to move past the tag string.
            GetString( ref position, false );

 
            while (m_data[position] == c_attribute)
            { 
                position++; 
                String strName = GetString( ref position );
                String strValue = GetString( ref position ); 

                if (String.Equals( strName, attributeName ))
                {
                    strRetValue = strValue; 
                    break;
                } 
            } 

 
            return strRetValue;
        }
    }
}

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