XmlByteStreamReader.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.ServiceModel.Channels / System / ServiceModel / Channels / XmlByteStreamReader.cs / 1305376 / XmlByteStreamReader.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Channels 
{
    using System; 
    using System.IO; 
    using System.Runtime;
    using System.Xml; 

    abstract class XmlByteStreamReader : XmlDictionaryReader
    {
        string base64StringValue; 
        bool closed;
        NameTable nameTable; 
 
        protected ReaderPosition position;
        protected XmlDictionaryReaderQuotas quotas; 
        bool readBase64AsString;
        protected XmlByteStreamReader(XmlDictionaryReaderQuotas quotas)
        {
            this.quotas = quotas; 
            this.position = ReaderPosition.None;
        } 
 
        public override int AttributeCount
        { 
            get { return 0; }
        }

        public override string BaseURI 
        {
            get { return string.Empty; } 
        } 

        public override bool CanCanonicalize 
        {
            get { return false; }
        }
 
        public override bool CanReadBinaryContent
        { 
            get { return true; } 
        }
 
        public override bool CanReadValueChunk
        {
            get { return false; }
        } 

        public override bool CanResolveEntity 
        { 
            get { return false; }
        } 

        public override int Depth
        {
            get { return (this.position == ReaderPosition.Content) ? 1 : 0; } 
        }
 
        public override bool EOF 
        {
            get { return (this.position == ReaderPosition.EOF); } 
        }

        public override bool HasAttributes
        { 
            get { return false; }
        } 
 
        public override bool HasValue
        { 
            get { return (this.position == ReaderPosition.Content); }
        }

        public override bool IsDefault 
        {
            get { return false; } 
        } 

        public override bool IsEmptyElement 
        {
            get { return false; }
        }
 
        public override string LocalName
        { 
            get { return (this.position == ReaderPosition.StartElement) ? ByteStreamMessageUtility.StreamElementName : null; } 
        }
 
        public override void MoveToStartElement()
        {
            base.MoveToStartElement();
            this.position = ReaderPosition.StartElement; 
        }
 
        public override XmlNameTable NameTable 
        {
            get 
            {
                if (this.nameTable == null)
                {
                    this.nameTable = new NameTable(); 
                    this.nameTable.Add(ByteStreamMessageUtility.StreamElementName);
                } 
                return this.nameTable; 
            }
        } 

        public override string NamespaceURI
        {
            get { return string.Empty; } 
        }
 
        public override XmlNodeType NodeType 
        {
            get 
            {
                switch (position)
                {
                    case ReaderPosition.StartElement: 
                        return XmlNodeType.Element;
                    case ReaderPosition.Content: 
                        return XmlNodeType.Text; 
                    case ReaderPosition.EndElement:
                        return XmlNodeType.EndElement; 
                    default:
                        // and StreamPosition.EOF
                        return XmlNodeType.None;
                } 
            }
        } 
 
        public override string Prefix
        { 
            get { return string.Empty; }
        }

        public override XmlDictionaryReaderQuotas Quotas 
        {
            get { return this.quotas; } 
        } 

        public override ReadState ReadState 
        {
            get
            {
                switch (this.position) 
                {
                    case ReaderPosition.None: 
                        return ReadState.Initial; 
                    case ReaderPosition.StartElement:
                    case ReaderPosition.Content: 
                    case ReaderPosition.EndElement:
                        return ReadState.Interactive;
                    case ReaderPosition.EOF:
                        return ReadState.Closed; 
                    default:
                        Fx.Assert("Unknown ReadState hit in XmlByteStreamReader"); 
                        return ReadState.Error; 
                }
            } 
        }

        public override string Value
        { 
            get
            { 
                switch (this.position) 
                {
                    case ReaderPosition.Content: 
                        if (!this.readBase64AsString)
                        {
                            this.base64StringValue = Convert.ToBase64String(ReadContentAsBase64());
                            this.readBase64AsString = true; 
                        }
                        return this.base64StringValue; 
 
                    default:
                        return string.Empty; 
                }
            }
        }
 
        public override void Close()
        { 
            if (!this.closed) 
            {
                try 
                {
                    this.OnClose();
                }
                finally 
                {
                    this.position = ReaderPosition.EOF; 
                    this.closed = true; 
                }
            } 
        }

        protected bool IsClosed
        { 
            get { return this.closed; }
        } 
 
        protected virtual void OnClose()
        { 
            this.quotas = null;
        }

        public override string GetAttribute(int i) 
        {
            throw FxTrace.Exception.ArgumentOutOfRange("i", i, SR.ArgumentNotInSetOfValidValues); 
        } 

        public override string GetAttribute(string name, string namespaceURI) 
        {
            return null;
        }
 
        public override string GetAttribute(string name)
        { 
            return null; 
        }
 
        public override string LookupNamespace(string prefix)
        {
            if (prefix == string.Empty)
            { 
                return string.Empty;
            } 
            else if (prefix == "xml") 
            {
                return ByteStreamMessageUtility.XmlNamespace; 
            }
            else if (prefix == "xmlns")
            {
                return ByteStreamMessageUtility.XmlNamespaceNamespace; 
            }
            else 
            { 
                return null;
            } 
        }

        public override bool MoveToAttribute(string name, string ns)
        { 
            return false;
        } 
 
        public override bool MoveToAttribute(string name)
        { 
            return false;
        }

        public override bool MoveToElement() 
        {
            if (this.position == ReaderPosition.None) 
            { 
                this.position = ReaderPosition.StartElement;
                return true; 
            }
            return false;
        }
 
        public override bool MoveToFirstAttribute()
        { 
            return false; 
        }
 
        public override bool MoveToNextAttribute()
        {
            return false;
        } 

        public override bool Read() 
        { 
            switch (this.position)
            { 
                case ReaderPosition.None:
                    position = ReaderPosition.StartElement;
                    return true;
                case ReaderPosition.StartElement: 
                    position = ReaderPosition.Content;
                    return true; 
                case ReaderPosition.Content: 
                    position = ReaderPosition.EndElement;
                    return true; 
                case ReaderPosition.EndElement:
                    position = ReaderPosition.EOF;
                    return false;
                case ReaderPosition.EOF: 
                    return false;
                default: 
                    // we should never get here 
                    // it means we managed to get into some unknown position in the stream
                    Fx.Assert(false, "Unknown read position in XmlByteStreamReader"); 
                    return false;
            }
        }
 
        public override bool ReadAttributeValue()
        { 
            return false; 
        }
 
        public override abstract int ReadContentAsBase64(byte[] buffer, int index, int count);

        public override int ReadContentAsBinHex(byte[] buffer, int index, int count)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        } 
 
        public override void ResolveEntity()
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }

        protected void EnsureInContent() 
        {
            if (this.position != ReaderPosition.Content) 
            { 
                throw FxTrace.Exception.AsError(
                    new InvalidOperationException(SR.ByteStreamReaderNotInByteStream(ByteStreamMessageUtility.StreamElementName))); 
            }
        }

        protected enum ReaderPosition 
        {
            None, 
            StartElement, 
            Content,
            EndElement, 
            EOF
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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XmlByteStreamReader.cs source code in C# .NET

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