XmlByteStreamWriter.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 / XmlByteStreamWriter.cs / 1305376 / XmlByteStreamWriter.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

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

    sealed class XmlByteStreamWriter : XmlDictionaryWriter
    {
        bool ownsStream; 
        ByteStreamWriterState state;
        Stream stream; 
 
        public XmlByteStreamWriter(Stream stream, bool ownsStream)
        { 
            Fx.Assert(stream != null, "stream is null");

            this.stream = stream;
            this.ownsStream = ownsStream; 
            this.state = ByteStreamWriterState.Start;
        } 
 
        public override WriteState WriteState
        { 
            get { return ByteStreamWriterStateToWriteState(this.state); }
        }

        public override void Close() 
        {
            if (this.state != ByteStreamWriterState.Closed) 
            { 
                try
                { 
                    if (ownsStream)
                    {
                        this.stream.Close();
                    } 
                    this.stream = null;
                } 
                finally 
                {
                    this.state = ByteStreamWriterState.Closed; 
                }
            }
        }
 
        public override void Flush()
        { 
            ThrowIfClosed(); 
            this.stream.Flush();
        } 

        void InternalWriteEndElement()
        {
            ThrowIfClosed(); 
            if (this.state != ByteStreamWriterState.StartElement && this.state != ByteStreamWriterState.Content)
            { 
                throw FxTrace.Exception.AsError( 
                    new InvalidOperationException(SR.XmlUnexpectedEndElement));
            } 
            this.state = ByteStreamWriterState.EndElement;
        }

        public override string LookupPrefix(string ns) 
        {
            if (ns == string.Empty) 
            { 
                return string.Empty;
            } 
            else if (ns == ByteStreamMessageUtility.XmlNamespace)
            {
                return "xml";
            } 
            else if (ns == ByteStreamMessageUtility.XmlNamespaceNamespace)
            { 
                return "xmlns"; 
            }
            else 
            {
                return null;
            }
        } 

        public override void WriteBase64(byte[] buffer, int index, int count) 
        { 
            ThrowIfClosed();
            ByteStreamMessageUtility.EnsureByteBoundaries(buffer, index, count); 

            if (this.state != ByteStreamWriterState.Content && this.state != ByteStreamWriterState.StartElement)
            {
                throw FxTrace.Exception.AsError( 
                    new InvalidOperationException(SR.XmlWriterMustBeInElement(ByteStreamWriterStateToWriteState(this.state))));
            } 
 
            this.stream.Write(buffer, index, count);
            this.state = ByteStreamWriterState.Content; 
        }

        public override void WriteCData(string text)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        } 
 
        public override void WriteCharEntity(char ch)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }

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

        public override void WriteComment(string text) 
        {
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }
 
        public override void WriteDocType(string name, string pubid, string sysid, string subset)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        }
 
        public override void WriteEndAttribute()
        {
            throw FxTrace.Exception.AsError(new NotSupportedException());
        } 

        public override void WriteEndDocument() 
        { 
            return;
        } 

        public override void WriteEndElement()
        {
            this.InternalWriteEndElement(); 
        }
 
        public override void WriteEntityRef(string name) 
        {
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        }

        public override void WriteFullEndElement()
        { 
            this.InternalWriteEndElement();
        } 
 
        public override void WriteProcessingInstruction(string name, string text)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }

        public override void WriteRaw(string data) 
        {
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        } 

        public override void WriteRaw(char[] buffer, int index, int count) 
        {
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }
 
        public override void WriteStartAttribute(string prefix, string localName, string ns)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        }
 
        public override void WriteStartDocument(bool standalone)
        {
            ThrowIfClosed();
        } 

        public override void WriteStartDocument() 
        { 
            ThrowIfClosed();
        } 

        public override void WriteStartElement(string prefix, string localName, string ns)
        {
            ThrowIfClosed(); 
            if (this.state != ByteStreamWriterState.Start)
            { 
                throw FxTrace.Exception.AsError( 
                    new InvalidOperationException(SR.ByteStreamWriteStartElementAlreadyCalled));
            } 

            if (!string.IsNullOrEmpty(prefix) || !string.IsNullOrEmpty(ns) || localName != ByteStreamMessageUtility.StreamElementName)
            {
                throw FxTrace.Exception.AsError( 
                    new XmlException(SR.XmlStartElementNameExpected(ByteStreamMessageUtility.StreamElementName, localName)));
            } 
            this.state = ByteStreamWriterState.StartElement; 
        }
 
        public override void WriteString(string text)
        {
            // no state checks here - WriteBase64 will take care of this.
            byte[] buffer = Convert.FromBase64String(text); 
            WriteBase64(buffer, 0, buffer.Length);
        } 
 
        public override void WriteSurrogateCharEntity(char lowChar, char highChar)
        { 
            throw FxTrace.Exception.AsError(new NotSupportedException());
        }

        public override void WriteWhitespace(string ws) 
        {
            throw FxTrace.Exception.AsError(new NotSupportedException()); 
        } 

        void ThrowIfClosed() 
        {
            if (this.state == ByteStreamWriterState.Closed)
            {
                throw FxTrace.Exception.AsError( 
                    new InvalidOperationException(SR.XmlWriterClosed));
            } 
        } 

        WriteState ByteStreamWriterStateToWriteState(ByteStreamWriterState byteStreamWriterState) 
        {
            // Converts the internal ByteStreamWriterState to an Xml WriteState
            switch (byteStreamWriterState)
            { 
                case ByteStreamWriterState.Start:
                    return WriteState.Start; 
                case ByteStreamWriterState.StartElement: 
                    return WriteState.Element;
                case ByteStreamWriterState.Content: 
                    return WriteState.Content;
                case ByteStreamWriterState.EndElement:
                    return WriteState.Element;
                case ByteStreamWriterState.Closed: 
                    return WriteState.Closed;
                default: 
                    return WriteState.Error; 
            }
        } 

        enum ByteStreamWriterState
        {
            Start, 
            StartElement,
            Content, 
            EndElement, 
            Closed
        } 
    }
}

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

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