XmlEncodedRawTextWriter.cs source code in C# .NET

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Code:

/ FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / Xml / System / Xml / Core / XmlEncodedRawTextWriter.cs / 5 / XmlEncodedRawTextWriter.cs

                            //------------------------------------------------------------------------------
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
// [....]
//----------------------------------------------------------------------------- 
 
// WARNING: This file is generated and should not be modified directly.  Instead,
// modify XmlTextWriterGenerator.cxx and run gen.bat in the same directory. 
// This batch file will execute the following commands:
//
//   cl.exe /C /EP /D _XML_UTF8_TEXT_WRITER XmlRawTextWriterGenerator.cxx > XmlUtf8RawTextWriter.cs
//   cl.exe /C /EP /D _XML_ENCODED_TEXT_WRITER XmlRawTextWriterGenerator.cxx > XmlEncodedRawTextWriter.cs 
//
// Because these two implementations of XmlTextWriter are so similar, the C++ preprocessor 
// is used to generate each implementation from one template file, using macros and ifdefs. 

 



 

 
 

 



 

 
 

 



 

 
 

 



 

 
 

 



 

 
 

 



 

 
 

 



 

using System; 
using System.IO; 
using System.Xml;
using System.Text; 
using System.Xml.Schema;
using System.Diagnostics;
using System.Globalization;
 
namespace System.Xml {
 
    // Concrete implementation of XmlWriter abstract class that serializes events as encoded XML 
    // text.  The general-purpose XmlEncodedTextWriter uses the Encoder class to output to any
    // encoding.  The XmlUtf8TextWriter class combined the encoding operation with serialization 
    // in order to achieve better performance.
    internal class XmlEncodedRawTextWriter : XmlRawWriter {
//
// Fields 
//
        // main buffer 
        protected byte[] bufBytes; 

        // output stream 
        protected Stream    stream;

        // encoding of the stream or text writer
        protected Encoding encoding; 

        // char type tables 
        protected XmlCharType xmlCharType = XmlCharType.Instance; 

        // buffer positions 
        protected int   bufPos = 1;     // buffer position starts at 1, because we need to be able to safely step back -1 in case we need to
                                        // close an empty element or in CDATA section detection of double ]; _BUFFER[0] will always be 0
        protected int   textPos = 1;    // text end position; don't indent first element, pi, or comment
        protected int   contentPos;     // element content end position 
        protected int   cdataPos;       // cdata end position
        protected int   attrEndPos;     // end of the last attribute 
        protected int   bufLen = BUFSIZE; 

        // flags 
        protected bool  writeToNull;
        protected bool  hadDoubleBracket;
        protected bool  inAttributeValue;
 

        protected int    bufBytesUsed; 
        protected char[] bufChars; 

        // encoder for encoding chars in specified encoding when writing to stream 
        protected Encoder       encoder;

        // output text writer
        protected TextWriter    writer; 

        // escaping of characters invalid in the output encoding 
        protected bool  trackTextContent; 
        protected bool  inTextContent;
        private int     lastMarkPos; 
        private int[]   textContentMarks;   // even indices contain text content start positions
                                            // odd indices contain markup start positions
        private CharEntityEncoderFallback charEntityFallback;
 

        // writer settings 
        protected NewLineHandling   newLineHandling; 
        protected bool              closeOutput;
        protected bool              omitXmlDeclaration; 
        protected bool              autoXmlDeclaration;
        protected string            newLineChars;
        protected XmlStandalone     standalone;
        protected XmlOutputMethod   outputMethod; 
        protected bool              checkCharacters;
        protected bool              mergeCDataSections; 
 
//
// Constants 
//
        private const int BUFSIZE = 2048 * 3;       // Should be greater than default FileStream size (4096), otherwise the FileStream will try to cache the data
        private const int OVERFLOW = 32;            // Allow overflow in order to reduce checks when writing out constant size markup
        private const int INIT_MARKS_COUNT = 64; 

// 
// Constructors 
//
        // Construct and initialize an instance of this class. 
        protected XmlEncodedRawTextWriter( XmlWriterSettings settings, bool closeOutput ) {
            // copy settings
            newLineHandling = settings.NewLineHandling;
            omitXmlDeclaration = settings.OmitXmlDeclaration; 
            newLineChars = settings.NewLineChars;
            standalone = settings.Standalone; 
            outputMethod = settings.OutputMethod; 
            checkCharacters = settings.CheckCharacters;
            mergeCDataSections = settings.MergeCDataSections; 
            this.closeOutput = closeOutput;

            if ( checkCharacters && newLineHandling == NewLineHandling.Replace ) {
                ValidateContentChars( newLineChars, "NewLineChars", false ); 
            }
        } 
 

        // Construct an instance of this class that outputs text to the TextWriter interface. 
        public XmlEncodedRawTextWriter( TextWriter writer, XmlWriterSettings settings ) : this( settings, settings.CloseOutput ) {
            Debug.Assert( writer != null && settings != null );

            this.writer = writer; 
            this.encoding = writer.Encoding;
            // the buffer is allocated will OVERFLOW in order to reduce checks when writing out constant size markup 
            this.bufChars = new char[BUFSIZE + OVERFLOW]; 

            // Write the xml declaration 
            if ( settings.AutoXmlDeclaration ) {
                WriteXmlDeclaration( standalone );
                autoXmlDeclaration = true;
            } 
        }
 
 
        // Construct an instance of this class that serializes to a Stream interface.
        public XmlEncodedRawTextWriter( Stream stream, Encoding encoding, XmlWriterSettings settings, bool closeOutput ) : this( settings, closeOutput ) { 
            Debug.Assert( stream != null && settings != null );

            this.stream = stream;
            this.encoding = encoding; 

 
 

 



 

 
 

 

            // the buffer is allocated will OVERFLOW in order to reduce checks when writing out constant size markup
            bufChars = new char[ BUFSIZE + OVERFLOW ];
            bufBytes = new byte[ bufChars.Length ]; 
            bufBytesUsed = 0;
 
            // Init escaping of characters not fitting into the target encoding 
            trackTextContent = true;
            inTextContent = false; 
            lastMarkPos = 0;
            textContentMarks = new int[INIT_MARKS_COUNT];
            textContentMarks[0] = 1;
 
            charEntityFallback = new CharEntityEncoderFallback();
            encoding = (Encoding)encoding.Clone(); 
            encoding.EncoderFallback = charEntityFallback; 
            this.encoding = encoding;
 
            encoder = encoding.GetEncoder();

            if ( !stream.CanSeek || stream.Position == 0 ) {
                byte[] bom = encoding.GetPreamble(); 
                if ( bom.Length != 0 ) {
                    this.stream.Write( bom, 0, bom.Length ); 
                } 
            }
 

            // Write the xml declaration
            if ( settings.AutoXmlDeclaration ) {
                WriteXmlDeclaration( standalone ); 
                autoXmlDeclaration = true;
            } 
        } 

// 
// XmlWriter implementation
//
        // Returns settings the writer currently applies.
        public override XmlWriterSettings Settings { 
            get {
                XmlWriterSettings settings = new XmlWriterSettings(); 
 
                settings.Encoding = encoding;
                settings.OmitXmlDeclaration = omitXmlDeclaration; 
                settings.NewLineHandling = newLineHandling;
                settings.NewLineChars = newLineChars;
                settings.CloseOutput = closeOutput;
                settings.ConformanceLevel = ConformanceLevel.Auto; 
                settings.AutoXmlDeclaration = autoXmlDeclaration;
                settings.Standalone = standalone; 
                settings.OutputMethod = outputMethod; 
                settings.CheckCharacters = checkCharacters;
 
                settings.ReadOnly = true;

                return settings;
            } 
        }
 
        // Write the xml declaration.  This must be the first call. 
        internal override void WriteXmlDeclaration( XmlStandalone standalone ) {
            // Output xml declaration only if user allows it and it was not already output 
            if ( !omitXmlDeclaration && !autoXmlDeclaration ) {

                if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
 
                RawText( "" ); 
            } 
        }
 
        internal override void WriteXmlDeclaration( string xmldecl ) {
            // Output xml declaration only if user allows it and it was not already output
            if ( !omitXmlDeclaration && !autoXmlDeclaration ) {
                WriteProcessingInstruction( "xml", xmldecl ); 
            }
        } 
 
        // Serialize the document type declaration.
        public override void WriteDocType( string name, string pubid, string sysid, string subset ) { 
            Debug.Assert( name != null && name.Length > 0 );

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
 
            RawText( "'; 
        }
 
        // Serialize the beginning of an element start tag: " 0 ); 
            Debug.Assert( prefix != null );

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
 
            bufChars[bufPos++] = (char) '<';
            if ( prefix != null && prefix.Length != 0 ) { 
                RawText( prefix ); 
                bufChars[this.bufPos++] = (char) ':';
            } 

            RawText( localName );

            attrEndPos = bufPos; 
        }
 
        // Serialize the end of an element start tag in preparation for content serialization: ">" 
        internal override void StartElementContent() {
            bufChars[bufPos++] = (char) '>'; 

            // StartElementContent is always called; therefore, in order to allow shortcut syntax, we save the
            // position of the '>' character.  If WriteEndElement is called and no other characters have been
            // output, then the '>' character can be be overwritten with the shortcut syntax " />". 
            contentPos = bufPos;
        } 
 
        // Serialize an element end tag: "", if content was output.  Otherwise, serialize
        // the shortcut syntax: " />". 
        internal override void WriteEndElement( string prefix, string localName, string ns ) {
            Debug.Assert( localName != null && localName.Length > 0 );
            Debug.Assert( prefix != null );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
 
            if ( contentPos != bufPos ) { 
                // Content has been output, so can't use shortcut syntax
                bufChars[bufPos++] = (char) '<'; 
                bufChars[bufPos++] = (char) '/';

                if ( prefix != null && prefix.Length != 0) {
                    RawText( prefix ); 
                    bufChars[bufPos++] = (char) ':';
                } 
                RawText( localName ); 
                bufChars[bufPos++] = (char) '>';
            } 
            else {
                // Use shortcut syntax; overwrite the already output '>' character
                bufPos--;
                bufChars[bufPos++] = (char) ' '; 
                bufChars[bufPos++] = (char) '/';
                bufChars[bufPos++] = (char) '>'; 
            } 
        }
 
        // Serialize a full element end tag: ""
        internal override void WriteFullEndElement( string prefix, string localName, string ns ) {
            Debug.Assert( localName != null && localName.Length > 0 );
            Debug.Assert( prefix != null ); 

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 
 
            bufChars[bufPos++] = (char) '<';
            bufChars[bufPos++] = (char) '/'; 

            if ( prefix != null && prefix.Length != 0) {
                RawText( prefix );
                bufChars[bufPos++] = (char) ':'; 
            }
            RawText( localName ); 
            bufChars[bufPos++] = (char) '>'; 
        }
 
        // Serialize an attribute tag using double quotes around the attribute value: 'prefix:localName="'
        public override void WriteStartAttribute( string prefix, string localName, string ns ) {
            Debug.Assert( localName != null && localName.Length  > 0 );
            Debug.Assert( prefix != null ); 

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 
 
            if ( attrEndPos == bufPos ) {
                bufChars[bufPos++] = (char) ' '; 
            }

            if ( prefix != null && prefix.Length > 0 ) {
                RawText( prefix ); 
                bufChars[bufPos++] = (char) ':';
            } 
            RawText( localName ); 
            bufChars[bufPos++] = (char) '=';
            bufChars[bufPos++] = (char) '"'; 

            inAttributeValue = true;
        }
 
        // Serialize the end of an attribute value using double quotes: '"'
        public override void WriteEndAttribute() { 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 
            bufChars[bufPos++] = (char) '"';
            inAttributeValue = false; 
            attrEndPos = bufPos;
        }

        internal override void WriteNamespaceDeclaration( string prefix, string namespaceName ) { 
            Debug.Assert( prefix != null && namespaceName != null );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 

            if ( prefix.Length == 0 ) { 
                RawText( " xmlns=\"" );
            }
            else {
                RawText( " xmlns:" ); 
                RawText( prefix );
                bufChars[bufPos++] = (char)'='; 
                bufChars[bufPos++] = (char)'"'; 
            }
 
            inAttributeValue = true;
            if ( trackTextContent && inTextContent != true ) { ChangeTextContentMark( true ); }
            WriteString( namespaceName );
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 
            inAttributeValue = false;
 
            bufChars[bufPos++] = (char)'"'; 
            attrEndPos = bufPos;
        } 

        // Serialize a CData section.  If the "]]>" pattern is found within
        // the text, replace it with "]]>".
        public override void WriteCData( string text ) { 
            Debug.Assert( text != null );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 

            if ( mergeCDataSections && bufPos == cdataPos ) { 
                // Merge adjacent cdata sections - overwrite the "]]>" characters
                Debug.Assert( bufPos >= 4 );
                bufPos -= 3;
            } 
            else {
                // Start a new cdata section 
                bufChars[bufPos++] = (char) '<'; 
                bufChars[bufPos++] = (char) '!';
                bufChars[bufPos++] = (char) '['; 
                bufChars[bufPos++] = (char) 'C';
                bufChars[bufPos++] = (char) 'D';
                bufChars[bufPos++] = (char) 'A';
                bufChars[bufPos++] = (char) 'T'; 
                bufChars[bufPos++] = (char) 'A';
                bufChars[bufPos++] = (char) '['; 
            } 

            WriteCDataSection( text ); 

            bufChars[bufPos++] = (char) ']';
            bufChars[bufPos++] = (char) ']';
            bufChars[bufPos++] = (char) '>'; 

            textPos = bufPos; 
            cdataPos = bufPos; 
        }
 
        // Serialize a comment.
        public override void WriteComment( string text ) {
            Debug.Assert( text != null );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
 
            bufChars[bufPos++] = (char) '<'; 
            bufChars[bufPos++] = (char) '!';
            bufChars[bufPos++] = (char) '-'; 
            bufChars[bufPos++] = (char) '-';

            WriteCommentOrPi( text, '-' );
 
            bufChars[bufPos++] = (char) '-';
            bufChars[bufPos++] = (char) '-'; 
            bufChars[bufPos++] = (char) '>'; 
        }
 
        // Serialize a processing instruction.
        public override void WriteProcessingInstruction( string name, string text ) {
            Debug.Assert( name != null && name.Length > 0 );
            Debug.Assert( text != null ); 

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 
 
            bufChars[bufPos++] = (char) '<';
            bufChars[bufPos++] = (char) '?'; 
            RawText( name );

            if ( text.Length > 0 ) {
                bufChars[bufPos++] = (char) ' '; 
                WriteCommentOrPi( text, '?' );
            } 
 
            bufChars[bufPos++] = (char) '?';
            bufChars[bufPos++] = (char) '>'; 
        }

        // Serialize an entity reference.
        public override void WriteEntityRef( string name ) { 
            Debug.Assert( name != null && name.Length > 0 );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 

            bufChars[bufPos++] = (char) '&'; 
            RawText( name );
            bufChars[bufPos++] = (char) ';';

            if ( bufPos > bufLen ) { 
                FlushBuffer();
            } 
 
            textPos = bufPos;
        } 

        // Serialize a character entity reference.
        public override void WriteCharEntity( char ch ) {
            string strVal = ((int)ch).ToString( "X", NumberFormatInfo.InvariantInfo ); 

            if ( checkCharacters && !xmlCharType.IsCharData( ch ) ) { 
                throw XmlConvert.CreateInvalidCharException( ch ); 
            }
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }

            bufChars[bufPos++] = (char)'&';
            bufChars[bufPos++] = (char)'#'; 
            bufChars[bufPos++] = (char)'x';
            RawText( strVal ); 
            bufChars[bufPos++] = (char)';'; 

            if ( bufPos > bufLen ) { 
                FlushBuffer();
            }

            textPos = bufPos; 
        }
 
        // Serialize a whitespace node. 
        public override unsafe void WriteWhitespace( string ws ) {
            Debug.Assert( ws != null ); 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }

            fixed ( char * pSrc = ws ) {
                char * pSrcEnd = pSrc + ws.Length; 
                if ( inAttributeValue) {
                    WriteAttributeTextBlock( pSrc, pSrcEnd ); 
                } 
                else {
                    WriteElementTextBlock( pSrc, pSrcEnd ); 
                }
            }
        }
 
        // Serialize either attribute or element text using XML rules.
        public override unsafe void WriteString( string text ) { 
            Debug.Assert( text != null ); 
            if ( trackTextContent && inTextContent != true ) { ChangeTextContentMark( true ); }
 
            fixed ( char * pSrc = text ) {
                char * pSrcEnd = pSrc + text.Length;
                if ( inAttributeValue) {
                    WriteAttributeTextBlock( pSrc, pSrcEnd ); 
                }
                else { 
                    WriteElementTextBlock( pSrc, pSrcEnd ); 
                }
            } 
        }

        // Serialize surrogate character entity.
        public override void WriteSurrogateCharEntity( char lowChar, char highChar ) { 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); }
            int surrogateChar = ( (int)lowChar - SurLowStart ) | ( ( (int)highChar - SurHighStart ) << 10 ) + 0x10000; 
 
            bufChars[bufPos++] = (char)'&';
            bufChars[bufPos++] = (char)'#'; 
            bufChars[bufPos++] = (char)'x';
            RawText( surrogateChar.ToString( "X", NumberFormatInfo.InvariantInfo ) );
            bufChars[bufPos++] = (char)';';
            textPos = bufPos; 
        }
 
        // Serialize either attribute or element text using XML rules. 
        public override unsafe void WriteChars( char[] buffer, int index, int count ) {
            Debug.Assert( buffer != null ); 
            Debug.Assert( index >= 0 );
            Debug.Assert( count >= 0 && index + count <= buffer.Length );

            if ( trackTextContent && inTextContent != true ) { ChangeTextContentMark( true ); } 

            fixed ( char * pSrcBegin = &buffer[index] ) { 
                if ( inAttributeValue ) { 
                    WriteAttributeTextBlock( pSrcBegin, pSrcBegin + count );
                } 
                else {
                    WriteElementTextBlock( pSrcBegin, pSrcBegin + count );
                }
            } 
        }
 
        // Serialize raw data. 
        public override unsafe void WriteRaw( char[] buffer, int index, int count ) {
            Debug.Assert( buffer != null ); 
            Debug.Assert( index >= 0 );
            Debug.Assert( count >= 0 && index + count <= buffer.Length );

            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 

            fixed ( char * pSrcBegin = &buffer[index] ) { 
                WriteRawWithCharChecking( pSrcBegin, pSrcBegin + count ); 
            }
            textPos = bufPos; 
        }

        // Serialize raw data.
        public override unsafe void WriteRaw( string data ) { 
            Debug.Assert( data != null );
 
            if ( trackTextContent && inTextContent != false ) { ChangeTextContentMark( false ); } 

            fixed ( char * pSrcBegin = data ) { 
                WriteRawWithCharChecking( pSrcBegin, pSrcBegin + data.Length );
            }
            textPos = bufPos;
        } 

        // Flush all bytes in the buffer to output and close the output stream or writer. 
        public override void Close() { 
            FlushBuffer();
            FlushEncoder(); 

            // Future calls to Close or Flush shouldn't write to Stream or Writer
            writeToNull = true;
 
            if ( stream != null ) {
                stream.Flush(); 
                if ( closeOutput ) { 
                    stream.Close();
                } 
                stream = null;
            }

            else if ( writer != null ) { 
                writer.Flush();
                if ( closeOutput ) { 
                    writer.Close(); 
                }
                writer = null; 
            }

        }
 
        // Flush all characters in the buffer to output and call Flush() on the output object.
        public override void Flush() { 
            FlushBuffer(); 
            FlushEncoder();
 



 
            if ( stream != null ) {
                stream.Flush(); 
            } 
            else if ( writer != null ) {
                writer.Flush(); 
            }

        }
 
//
// Implementation methods 
// 
        // Flush all characters in the buffer to output.  Do not flush the output object.
        protected virtual void FlushBuffer() { 
            try {
                // Output all characters (except for previous characters stored at beginning of buffer)
                if ( !writeToNull ) {
 

 
 
                    Debug.Assert( stream != null || writer != null );
 
                    if ( stream != null ) {
                        if ( trackTextContent ) {
                            charEntityFallback.Reset( textContentMarks, lastMarkPos );
                            // reset text content tracking 

                            if ((lastMarkPos & 1) != 0) { 
                                // If the previous buffer ended inside a text content we need to preserve that info 
                                //   which means the next index to which we write has to be even
                                textContentMarks[1] = 1; 
                                lastMarkPos = 1;
                            }
                            else {
                                lastMarkPos = 0; 
                            }
                            Debug.Assert( textContentMarks[0] == 1 ); 
                        } 
                        EncodeChars( 1, bufPos, true );
                    } 
                    else {
                        // Write text to TextWriter
                        writer.Write( bufChars, 1, bufPos - 1 );
                    } 

                } 
            } 
            catch {
                // Future calls to flush (i.e. when Close() is called) don't attempt to write to stream 
                writeToNull = true;
                throw;
            }
            finally { 
                // Move last buffer character to the beginning of the buffer (so that previous character can always be determined)
                bufChars[0] = bufChars[bufPos - 1]; 
 

 



 

 
 

                // Reset buffer position 
                textPos = (textPos == bufPos) ? 1 : 0;
                attrEndPos = (attrEndPos == bufPos) ? 1 : 0;
                contentPos = 0;    // Needs to be zero, since overwriting '>' character is no longer possible
                cdataPos = 0;      // Needs to be zero, since overwriting ']]>' characters is no longer possible 
                bufPos = 1;        // Buffer position starts at 1, because we need to be able to safely step back -1 in case we need to
                                   // close an empty element or in CDATA section detection of double ]; _BUFFER[0] will always be 0 
            } 
        }
 



 

        private void EncodeChars( int startOffset, int endOffset, bool writeAllToStream ) { 
            // Write encoded text to stream 
            int chEnc;
            int bEnc; 
            bool completed;
            while ( startOffset < endOffset ) {
                if ( charEntityFallback != null ) {
                    charEntityFallback.StartOffset = startOffset; 
                }
                encoder.Convert( bufChars, startOffset, endOffset - startOffset, bufBytes, bufBytesUsed, bufBytes.Length - bufBytesUsed, false, out chEnc, out bEnc, out completed ); 
                startOffset += chEnc; 
                bufBytesUsed += bEnc;
                if ( bufBytesUsed >= ( bufBytes.Length - 16 ) ) { 
                    stream.Write( bufBytes, 0, bufBytesUsed );
                    bufBytesUsed = 0;
                }
            } 
            if ( writeAllToStream && bufBytesUsed > 0 ) {
                stream.Write( bufBytes, 0, bufBytesUsed ); 
                bufBytesUsed = 0; 
            }
        } 

        private void FlushEncoder() {
            Debug.Assert( bufPos == 1 );
            if ( stream != null ) { 
                int chEnc;
                int bEnc; 
                bool completed; 
                // decode no chars, just flush
                encoder.Convert( bufChars, 1, 0, bufBytes, 0, bufBytes.Length, true, out chEnc, out bEnc, out completed ); 
                if ( bEnc != 0 ) {
                    stream.Write( bufBytes, 0, bEnc );
                }
            } 
        }
 
 
        // Serialize text that is part of an attribute value.  The '&', '<', '>', and '"' characters
        // are entitized. 
        protected unsafe void WriteAttributeTextBlock( char *pSrc, char *pSrcEnd ) {
            fixed ( char * pDstBegin = bufChars ) {
                char * pDst = pDstBegin + this.bufPos;
 
                int ch = 0;
                for (;;) { 
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc ); 
                    if ( pDstEnd > pDstBegin + bufLen ) {
                        pDstEnd = pDstBegin + bufLen; 
                    }


 

                    while ( pDst < pDstEnd && ( ( ( xmlCharType.charProperties[( ch = *pSrc )] & XmlCharType.fAttrValue ) != 0 ) ) ) { 
 
                        *pDst = (char)ch;
                        pDst++; 
                        pSrc++;
                    }
                    Debug.Assert( pSrc <= pSrcEnd );
 
                    // end of value
                    if ( pSrc >= pSrcEnd ) { 
                        break; 
                    }
 
                    // end of buffer
                    if ( pDst >= pDstEnd ) {
                        bufPos = (int)(pDst - pDstBegin);
                        FlushBuffer(); 
                        pDst = pDstBegin + 1;
                        continue; 
                    } 

                    // some character needs to be escaped 
                    switch ( ch ) {
                        case '&':
                            pDst = AmpEntity( pDst );
                            break; 
                        case '<':
                            pDst = LtEntity( pDst ); 
                            break; 
                        case '>':
                            pDst = GtEntity( pDst ); 
                            break;
                        case '"':
                            pDst = QuoteEntity( pDst );
                            break; 
                        case '\'':
                            *pDst = (char)ch; 
                            pDst++; 
                            break;
                        case (char)0x9: 
                            if ( newLineHandling == NewLineHandling.None ) {
                                *pDst = (char)ch;
                                pDst++;
                            } 
                            else {
                                // escape tab in attributes 
                                pDst = TabEntity( pDst ); 
                            }
                            break; 
                        case (char)0xD:
                            if ( newLineHandling == NewLineHandling.None ) {
                                *pDst = (char)ch;
                                pDst++; 
                            }
                            else { 
                                // escape new lines in attributes 
                                pDst = CarriageReturnEntity( pDst );
                            } 
                            break;
                        case (char)0xA:
                            if ( newLineHandling == NewLineHandling.None ) {
                                *pDst = (char)ch; 
                                pDst++;
                            } 
                            else { 
                                // escape new lines in attributes
                                pDst = LineFeedEntity( pDst ); 
                            }
                            break;
                        default:
                           if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, true ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; }; 
                            continue;
                    } 
                    pSrc++; 
                }
                bufPos = (int)(pDst - pDstBegin); 
            }
        }

        // Serialize text that is part of element content.  The '&', '<', and '>' characters 
        // are entitized.
        protected unsafe void WriteElementTextBlock( char *pSrc, char *pSrcEnd ) { 
            fixed ( char * pDstBegin = bufChars ) { 
                char * pDst = pDstBegin + this.bufPos;
 
                int ch = 0;
                for (;;) {
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc );
                    if ( pDstEnd > pDstBegin + bufLen ) { 
                        pDstEnd = pDstBegin + bufLen;
                    } 
 

 

                    while ( pDst < pDstEnd && ( ( ( xmlCharType.charProperties[( ch = *pSrc )] & XmlCharType.fAttrValue ) != 0 ) ) ) {

                        *pDst = (char)ch; 
                        pDst++;
                        pSrc++; 
                    } 
                    Debug.Assert( pSrc <= pSrcEnd );
 
                    // end of value
                    if ( pSrc >= pSrcEnd ) {
                        break;
                    } 

                    // end of buffer 
                    if ( pDst >= pDstEnd ) { 
                        bufPos = (int)(pDst - pDstBegin);
                        FlushBuffer(); 
                        pDst = pDstBegin + 1;
                        continue;
                    }
 
                    // some character needs to be escaped
                    switch ( ch ) { 
                        case '&': 
                            pDst = AmpEntity( pDst );
                            break; 
                        case '<':
                            pDst = LtEntity( pDst );
                            break;
                        case '>': 
                            pDst = GtEntity( pDst );
                            break; 
                        case '"': 
                        case '\'':
                        case (char)0x9: 
                            *pDst = (char)ch;
                            pDst++;
                            break;
                        case (char)0xA: 
                            if ( newLineHandling == NewLineHandling.Replace ) {
                                pDst = WriteNewLine( pDst ); 
                            } 
                            else {
                                *pDst = (char)ch; 
                                pDst++;
                            }
                            break;
                        case (char)0xD: 
                            switch ( newLineHandling ) {
                                case NewLineHandling.Replace: 
                                    // Replace "\r\n", or "\r" with NewLineChars 
                                    if ( pSrc[1] == '\n' ) {
                                        pSrc++; 
                                    }
                                    pDst = WriteNewLine( pDst );
                                    break;
                                case NewLineHandling.Entitize: 
                                    // Entitize 0xD
                                    pDst = CarriageReturnEntity( pDst ); 
                                    break; 
                                case NewLineHandling.None:
                                    *pDst = (char)ch; 
                                    pDst++;
                                    break;
                            }
                            break; 
                        default:
                            if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, true ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; }; 
                            continue; 
                    }
                    pSrc++; 
                }
                bufPos = (int)(pDst - pDstBegin);
                textPos = bufPos;
                contentPos = 0; 
            }
        } 
 
        protected unsafe void RawText( string s ) {
            Debug.Assert( s != null ); 
            fixed ( char * pSrcBegin = s ) {
                RawText( pSrcBegin, pSrcBegin + s.Length );
            }
        } 

        protected unsafe void RawText( char * pSrcBegin, char * pSrcEnd ) { 
            fixed ( char * pDstBegin = bufChars ) { 
                char * pDst = pDstBegin + this.bufPos;
                char * pSrc = pSrcBegin; 

                int ch = 0;
                for (;;) {
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc ); 
                    if ( pDstEnd > pDstBegin + this.bufLen ) {
                        pDstEnd = pDstBegin + this.bufLen; 
                    } 

 


                    while ( pDst < pDstEnd && ( ( ch = *pSrc ) < SurHighStart ) ) {
 
                        pSrc++;
                        *pDst = (char)ch; 
                        pDst++; 
                    }
                    Debug.Assert( pSrc <= pSrcEnd ); 

                    // end of value
                    if ( pSrc >= pSrcEnd ) {
                        break; 
                    }
 
                    // end of buffer 
                    if ( pDst >= pDstEnd ) {
                        bufPos = (int)(pDst - pDstBegin); 
                        FlushBuffer();
                        pDst = pDstBegin + 1;
                        continue;
                    } 

                    if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, false ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; }; 
                } 

                bufPos = (int)(pDst - pDstBegin); 
            }
        }

        protected unsafe void WriteRawWithCharChecking( char * pSrcBegin, char * pSrcEnd ) { 
            fixed ( char * pDstBegin = bufChars ) {
                char * pSrc = pSrcBegin; 
                char * pDst = pDstBegin + bufPos; 

                int ch = 0; 
                for (;;) {
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc );
                    if ( pDstEnd > pDstBegin + bufLen ) {
                        pDstEnd = pDstBegin + bufLen; 
                    }
 
 

 
                    while ( pDst < pDstEnd && ( ( ( xmlCharType.charProperties[( ch = *pSrc )] & XmlCharType.fText ) != 0 ) ) ) {

                        *pDst = (char)ch;
                        pDst++; 
                        pSrc++;
                    } 
 
                    Debug.Assert( pSrc <= pSrcEnd );
 
                    // end of value
                    if ( pSrc >= pSrcEnd ) {
                        break;
                    } 

                    // end of buffer 
                    if ( pDst >= pDstEnd ) { 
                        bufPos = (int)(pDst - pDstBegin);
                        FlushBuffer(); 
                        pDst = pDstBegin + 1;
                        continue;
                    }
 
                    // handle special characters
                    switch ( ch ) { 
                        case ']': 
                        case '<':
                        case '&': 
                        case (char)0x9:
                            *pDst = (char)ch;
                            pDst++;
                            break; 
                        case (char)0xD:
                            if ( newLineHandling == NewLineHandling.Replace ) { 
                                // Normalize "\r\n", or "\r" to NewLineChars 
                                if ( pSrc[1] == '\n' ) {
                                    pSrc++; 
                                }
                                pDst = WriteNewLine( pDst );
                            }
                            else { 
                                *pDst = (char)ch;
                                pDst++; 
                            } 
                            break;
                        case (char)0xA: 
                            if ( newLineHandling == NewLineHandling.Replace ) {
                                pDst = WriteNewLine( pDst );
                            }
                            else { 
                                *pDst = (char)ch;
                                pDst++; 
                            } 
                            break;
                        default: 
                            if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, false ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; };
                            continue;
                    }
                    pSrc++; 
                }
                bufPos = (int)(pDst - pDstBegin); 
            } 
        }
 
        protected unsafe void WriteCommentOrPi( string text, int stopChar ) {
            // write text
            fixed ( char * pSrcBegin = text )
            fixed ( char * pDstBegin = bufChars ) { 
                char * pSrc = pSrcBegin;
                char * pSrcEnd = pSrcBegin + text.Length; 
                char * pDst = pDstBegin + bufPos; 

                int ch = 0; 
                for (;;) {
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc );
                    if ( pDstEnd > pDstBegin + bufLen ) {
                        pDstEnd = pDstBegin + bufLen; 
                    }
 
 

 
                    while ( pDst < pDstEnd && ( ( ( xmlCharType.charProperties[( ch = *pSrc )] & XmlCharType.fText ) != 0 ) && ch != stopChar ) ) {

                        *pDst = (char)ch;
                        pDst++; 
                        pSrc++;
                    } 
 
                    Debug.Assert( pSrc <= pSrcEnd );
 
                    // end of value
                    if ( pSrc >= pSrcEnd ) {
                        break;
                    } 

                    // end of buffer 
                    if ( pDst >= pDstEnd ) { 
                        bufPos = (int)(pDst - pDstBegin);
                        FlushBuffer(); 
                        pDst = pDstBegin + 1;
                        continue;
                    }
 
                    // handle special characters
                    switch ( ch ) { 
                        case '-': 
                            *pDst = (char) '-';
                            pDst++; 
                            if ( ch == stopChar ) {
                                // Insert space between adjacent dashes or before comment's end dashes
                                if ( pSrc + 1 == pSrcEnd || *(pSrc + 1)== '-' ) {
                                    *pDst = (char) ' '; 
                                    pDst++;
                                } 
                            } 
                            break;
                        case '?': 
                            *pDst = (char) '?';
                            pDst++;
                            if ( ch == stopChar ) {
                                // Processing instruction: insert space between adjacent '?' and '>' 
                                if ( pSrc + 1 < pSrcEnd && *(pSrc + 1)== '>' ) {
                                    *pDst = (char) ' '; 
                                    pDst++; 
                                }
                            } 
                            break;
                        case ']':
                            *pDst = (char) ']';
                            pDst++; 
                            break;
                        case (char)0xD: 
                            if ( newLineHandling == NewLineHandling.Replace ) { 
                                // Normalize "\r\n", or "\r" to NewLineChars
                                if ( pSrc[1] == '\n' ) { 
                                    pSrc++;
                                }
                                pDst = WriteNewLine( pDst );
                            } 
                            else {
                                *pDst = (char)ch; 
                                pDst++; 
                            }
                            break; 
                        case (char)0xA:
                            if ( newLineHandling == NewLineHandling.Replace ) {
                                pDst = WriteNewLine( pDst );
                            } 
                            else {
                                *pDst = (char)ch; 
                                pDst++; 
                            }
                            break; 
                        case '<':
                        case '&':
                        case (char)0x9:
                            *pDst = (char)ch; 
                            pDst++;
                            break; 
                        default: 
                            if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, false ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; };
                            continue; 
                    }
                    pSrc++;
                }
                bufPos = (int)(pDst - pDstBegin); 
            }
        } 
 
        protected unsafe void WriteCDataSection( string text ) {
            // write text 
            fixed ( char * pSrcBegin = text )
            fixed ( char * pDstBegin = bufChars ) {
                char * pSrc = pSrcBegin;
                char * pSrcEnd = pSrcBegin + text.Length; 
                char * pDst = pDstBegin + bufPos;
 
                int ch = 0; 
                for (;;) {
                    char * pDstEnd = pDst + ( pSrcEnd - pSrc ); 
                    if ( pDstEnd > pDstBegin + bufLen ) {
                        pDstEnd = pDstBegin + bufLen;
                    }
 

 
 
                    while ( pDst < pDstEnd && ( ( ( xmlCharType.charProperties[( ch = *pSrc )] & XmlCharType.fAttrValue ) != 0 ) && ch != ']' ) ) {
 
                        *pDst = (char)ch;
                        pDst++;
                        pSrc++;
                    } 

                    Debug.Assert( pSrc <= pSrcEnd ); 
 
                    // end of value
                    if ( pSrc >= pSrcEnd ) { 
                        break;
                    }

                    // end of buffer 
                    if ( pDst >= pDstEnd ) {
                        bufPos = (int)(pDst - pDstBegin); 
                        FlushBuffer(); 
                        pDst = pDstBegin + 1;
                        continue; 
                    }

                    // handle special characters
                    switch ( ch ) { 
                        case '>':
                            if ( hadDoubleBracket && pDst[-1] == (char) ']') {   // pDst[-1] will always correct - there is a padding character at _BUFFER[0] 
                                // The characters "]]>" were found within the CData text 
                                pDst = RawEndCData( pDst );
                                pDst = RawStartCData( pDst ); 
                            }
                            *pDst = (char) '>';
                            pDst++;
                            break; 
                        case ']':
                            if ( pDst[-1] == (char)']' ) {   // pDst[-1] will always correct - there is a padding character at _BUFFER[0] 
                                hadDoubleBracket = true; 
                            }
                            else { 
                                hadDoubleBracket = false;
                            }
                            *pDst = (char)']';
                            pDst++; 
                            break;
                        case (char)0xD: 
                            if ( newLineHandling == NewLineHandling.Replace ) { 
                                // Normalize "\r\n", or "\r" to NewLineChars
                                if ( pSrc[1] == '\n' ) { 
                                    pSrc++;
                                }
                                pDst = WriteNewLine( pDst );
                            } 
                            else {
                                *pDst = (char)ch; 
                                pDst++; 
                            }
                            break; 
                        case (char)0xA:
                            if ( newLineHandling == NewLineHandling.Replace ) {
                                pDst = WriteNewLine( pDst );
                            } 
                            else {
                                *pDst = (char)ch; 
                                pDst++; 
                            }
                            break; 
                        case '&':
                        case '<':
                        case '"':
                        case '\'': 
                        case (char)0x9:
                            *pDst = (char)ch; 
                            pDst++; 
                            break;
                        default: 
                            if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, false ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; };
                            continue;
                    }
                    pSrc++; 
                }
                bufPos = (int)(pDst - pDstBegin); 
            } 
        }
 



 

 
 

        private static unsafe char* EncodeSurrogate( char* pSrc, char* pSrcEnd, char* pDst ) { 
            Debug.Assert( InRange( *pSrc, SurHighStart, SurLowEnd ) );

            int ch = *pSrc;
            if ( ch <= SurHighEnd ) { 
                if ( pSrc + 1 < pSrcEnd ) {
                    int lowChar = pSrc[1]; 
                    if ( lowChar >= SurLowStart ) { 

 



 

 
 

 

                        pDst[0] = (char)ch;
                        pDst[1] = (char)lowChar;
                        pDst += 2; 

                        return pDst; 
                    } 
                    throw XmlConvert.CreateInvalidSurrogatePairException( (char)lowChar, (char)ch );
                } 
                throw new ArgumentException( Res.GetString( Res.Xml_InvalidSurrogateMissingLowChar ) );
            }
            throw XmlConvert.CreateInvalidHighSurrogateCharException( (char)ch );
        } 

        private unsafe char* InvalidXmlChar( int ch, char* pDst, bool entitize ) { 
            Debug.Assert( !xmlCharType.IsWhiteSpace( (char)ch ) ); 
            Debug.Assert( !xmlCharType.IsAttributeValueChar( (char)ch ) );
 
            if ( checkCharacters ) {
                throw XmlConvert.CreateInvalidCharException( (char)ch );
            }
            else { 
                if ( entitize ) {
                    return CharEntity( pDst, (char)ch ); 
                } 
                else {
 


                        *pDst = (char)ch;
                        pDst++; 

 
 

 

                    return pDst;
                }
            } 
        }
 
        internal unsafe void EncodeChar(ref char* pSrc, char*pSrcEnd, ref char* pDst) { 
            int ch = *pSrc;
            if ( InRange( ch, SurHighStart, SurLowEnd ) ) { pDst = EncodeSurrogate( pSrc, pSrcEnd, pDst ); pSrc += 2; } else if ( ch <= 0x7F || ch >= 0xFFFE ) { pDst = InvalidXmlChar( ch, pDst, false ); pSrc++; } else { *pDst = (char)ch; pDst++; pSrc++; }; 
        }


 

 
 

 



 

 
 

 



 

 
 

 



 

 
 

 



 

 
        protected void ChangeTextContentMark( bool value ) { 
            Debug.Assert( inTextContent != value );
            Debug.Assert( inTextContent || ((lastMarkPos & 1) == 0) ); 
            inTextContent = value;
            if ( lastMarkPos + 1 == textContentMarks.Length ) {
                GrowTextContentMarks();
            } 
            textContentMarks[++lastMarkPos] = this.bufPos;
        } 
 
        private void GrowTextContentMarks() {
            Debug.Assert( lastMarkPos + 1 == textContentMarks.Length ); 
            int[] newTextContentMarks = new int[ textContentMarks.Length * 2 ];
            Array.Copy( textContentMarks, newTextContentMarks, textContentMarks.Length );
            textContentMarks = newTextContentMarks;
        } 

 
        // Write NewLineChars to the specified buffer position and return an updated position. 
        protected unsafe char * WriteNewLine( char * pDst ) {
            fixed ( char * pDstBegin = bufChars ) { 
                bufPos = (int) (pDst - pDstBegin);
                // Let RawText do the real work
                RawText( newLineChars );
                return pDstBegin + bufPos; 
            }
        } 
 
        // Following methods do not
 

        // Entitize '<' as "<".  Return an updated pointer.
        protected static unsafe char * LtEntity( char * pDst ) {
            pDst[0] = (char)'&'; 
            pDst[1] = (char)'l';
            pDst[2] = (char)'t'; 
            pDst[3] = (char)';'; 
            return pDst + 4;
        } 

        // Entitize '>' as ">".  Return an updated pointer.
        protected static unsafe char * GtEntity( char * pDst ) {
            pDst[0] = (char)'&'; 
            pDst[1] = (char)'g';
            pDst[2] = (char)'t'; 
            pDst[3] = (char)';'; 
            return pDst + 4;
        } 

        // Entitize '&' as "&".  Return an updated pointer.
        protected static unsafe char * AmpEntity( char * pDst ) {
            pDst[0] = (char)'&'; 
            pDst[1] = (char)'a';
            pDst[2] = (char)'m'; 
            pDst[3] = (char)'p'; 
            pDst[4] = (char)';';
            return pDst + 5; 
        }

        // Entitize '"' as """.  Return an updated pointer.
        protected static unsafe char * QuoteEntity( char * pDst ) { 
            pDst[0] = (char)'&';
            pDst[1] = (char)'q'; 
            pDst[2] = (char)'u'; 
            pDst[3] = (char)'o';
            pDst[4] = (char)'t'; 
            pDst[5] = (char)';';
            return pDst + 6;
        }
 
        // Entitize '\t' as "	".  Return an updated pointer.
        protected static unsafe char * TabEntity( char * pDst ) { 
            pDst[0] = (char)'&'; 
            pDst[1] = (char)'#';
            pDst[2] = (char)'x'; 
            pDst[3] = (char)'9';
            pDst[4] = (char)';';
            return pDst + 5;
        } 

        // Entitize 0xa as "
".  Return an updated pointer. 
        protected static unsafe char * LineFeedEntity( char * pDst ) { 
            pDst[0] = (char)'&';
            pDst[1] = (char)'#'; 
            pDst[2] = (char)'x';
            pDst[3] = (char)'A';
            pDst[4] = (char)';';
            return pDst + 5; 
        }
 
        // Entitize 0xd as "
".  Return an updated pointer. 
        protected static unsafe char * CarriageReturnEntity( char * pDst ) {
            pDst[0] = (char)'&'; 
            pDst[1] = (char)'#';
            pDst[2] = (char)'x';
            pDst[3] = (char)'D';
            pDst[4] = (char)';'; 
            return pDst + 5;
        } 
 
        private static unsafe char * CharEntity( char * pDst, char ch ) {
            string s = ((int)ch).ToString( "X",NumberFormatInfo.InvariantInfo ); 
            pDst[0] = (char)'&';
            pDst[1] = (char)'#';
            pDst[2] = (char)'x';
            pDst += 3; 

            fixed ( char *pSrc = s ) { 
                char *pS = pSrc; 
                while ( ( *pDst++ = (char)*pS++ ) != 0 );
            } 

            pDst[-1] = (char)';';
            return pDst;
        } 

        // Write "" to the specified buffer.  Return an updated pointer.
        protected static unsafe char * RawEndCData( char * pDst ) {
            pDst[0] = (char)']'; 
            pDst[1] = (char)']';
            pDst[2] = (char)'>'; 
            return pDst + 3; 
        }
 
        // This method tests whether a character is in a given range with just one test; start and end should be constants
        private static bool InRange( int ch, int start, int end ) {
            return (uint)( ch - start ) <= (uint)( end - start );
        } 

        protected unsafe void ValidateContentChars( string chars, string propertyName, bool allowOnlyWhitespace ) { 
            if ( allowOnlyWhitespace ) { 
                if ( !xmlCharType.IsOnlyWhitespace( chars ) ) {
                    throw new ArgumentException( Res.GetString( Res.Xml_IndentCharsNotWhitespace, propertyName ) ); 
                }
            }
            else {
                string error = null; 
                for ( int i = 0; i < chars.Length; i++ ) {
                    if ( !xmlCharType.IsTextChar( chars[i] ) ) { 
                        switch ( chars[i] ) { 
                            case '\n':
                            case '\r': 
                            case '\t':
                                continue;
                            case '<':
                            case '&': 
                            case ']':
                                error = Res.GetString( Res.Xml_InvalidCharacter, XmlException.BuildCharExceptionStr( chars[i] ) ); 
                                goto Error; 
                            default:
                                if ( (int)chars[i] >= SurHighStart && (int)chars[i] <= SurHighEnd ) { 
                                    if ( i + 1 < chars.Length ) {
                                        if ( (int)chars[i+1] >= SurLowStart && (int)chars[i+1] <= SurLowEnd  ) {
                                            i++;
                                            continue; 
                                        }
                                    } 
                                    error = Res.GetString( Res.Xml_InvalidSurrogateMissingLowChar ); 
                                    goto Error;
                                } 
                                else if ( (int)chars[i] >= SurLowStart && (int)chars[i] <= SurLowEnd ) {
                                    error = Res.GetString( Res.Xml_InvalidSurrogateHighChar, ((uint)chars[i]).ToString( "X", CultureInfo.InvariantCulture ) );
                                    goto Error;
                                } 
                                continue;
                        } 
                    } 
                }
                return; 

            Error:
                throw new ArgumentException( Res.GetString( Res.Xml_InvalidCharsInIndent, new string[] { propertyName, error } ) );
            } 
        }
    } 
 
    // Same as base text writer class except that elements, attributes, comments, and pi's are indented.
    internal class XmlEncodedRawTextWriterIndent : XmlEncodedRawTextWriter { 
//
// Fields
//
        protected int       indentLevel; 
        protected bool      newLineOnAttributes;
        protected string    indentChars; 
 
        protected bool      mixedContent;
        private BitStack    mixedContentStack; 

       protected ConformanceLevel conformanceLevel = ConformanceLevel.Auto;

// 
// Constructors
// 
 

        public XmlEncodedRawTextWriterIndent( TextWriter writer, XmlWriterSettings settings ) : base( writer, settings ) { 
            Init( settings );
        }

 
        public XmlEncodedRawTextWriterIndent( Stream stream, Encoding encoding, XmlWriterSettings settings, bool closeOutput ) : base( stream, encoding, settings, closeOutput ) {
            Init( settings ); 
        } 

// 
// XmlWriter methods
//
        // Returns settings the writer currently applies.
        public override XmlWriterSettings Settings { 
            get {
                XmlWriterSettings settings = base.Settings; 
 
                settings.ReadOnly = false;
                settings.Indent = true; 
                settings.IndentChars = indentChars;
                settings.NewLineOnAttributes = newLineOnAttributes;
                settings.ReadOnly = true;
 
                return settings;
            } 
        } 

        public override void WriteDocType( string name, string pubid, string sysid, string subset ) { 
            // Add indentation
            if ( !mixedContent && base.textPos != base.bufPos) {
                WriteIndent();
            } 
            base.WriteDocType( name, pubid, sysid, subset );
        } 
 
        public override void WriteStartElement( string prefix, string localName, string ns ) {
            Debug.Assert( localName != null && localName.Length != 0 && prefix != null && ns != null ); 

            // Add indentation
            if ( !mixedContent && base.textPos != base.bufPos) {
                WriteIndent(); 
            }
            indentLevel++; 
            mixedContentStack.PushBit( mixedContent ); 

            base.WriteStartElement( prefix, localName, ns ); 
        }

        internal override void StartElementContent() {
            // If this is the root element and we're writing a document 
            //   do not inherit the mixedContent flag into the root element.
            //   This is to allow for whitespace nodes on root level 
            //   without disabling indentation for the whole document. 
            if (indentLevel == 1 && conformanceLevel == ConformanceLevel.Document) {
                mixedContent = false; 
            }
            else {
                mixedContent = mixedContentStack.PeekBit();
            } 
            base.StartElementContent();
        } 
 
        internal override void OnRootElement(ConformanceLevel currentConformanceLevel) {
         // Just remember the current conformance level 
         conformanceLevel = currentConformanceLevel;
      }

        internal override void WriteEndElement(string prefix, string localName, string ns) { 
            // Add indentation
            indentLevel--; 
            if ( !mixedContent && base.contentPos != base.bufPos ) { 
                // There was content, so try to indent
                if ( base.textPos != base.bufPos ) { 
                    WriteIndent();
                }
            }
            mixedContent = mixedContentStack.PopBit(); 

            base.WriteEndElement( prefix, localName, ns ); 
        } 

        internal override void WriteFullEndElement(string prefix, string localName, string ns) { 
            // Add indentation
            indentLevel--;
            if ( !mixedContent && base.contentPos != base.bufPos ) {
                // There was content, so try to indent 
                if ( base.textPos != base.bufPos ) {
                    WriteIndent(); 
                } 
            }
            mixedContent = mixedContentStack.PopBit(); 

            base.WriteFullEndElement( prefix, localName, ns );
        }
 
        // Same as base class, plus possible indentation.
        public override void WriteStartAttribute( string prefix, string localName, string ns ) { 
            // Add indentation 
            if ( newLineOnAttributes ) {
                WriteIndent(); 
            }

            base.WriteStartAttribute( prefix, localName, ns );
        } 

        public override void WriteCData( string text ) { 
            mixedContent = true; 
            base.WriteCData( text );
        } 

        public override void WriteComment( string text ) {
            if ( !mixedContent && base.textPos != base.bufPos ) {
                WriteIndent(); 
            }
 
            base.WriteComment( text ); 
        }
 
        public override void WriteProcessingInstruction( string target, string text ) {
            if ( !mixedContent && base.textPos != base.bufPos ) {
                WriteIndent();
            } 

            base.WriteProcessingInstruction( target, text ); 
        } 

        public override void WriteEntityRef( string name ) { 
            mixedContent = true;
            base.WriteEntityRef( name );
        }
 
        public override void WriteCharEntity( char ch ) {
            mixedContent = true; 
            base.WriteCharEntity( ch ); 
        }
 
        public override void WriteSurrogateCharEntity( char lowChar, char highChar ) {
            mixedContent = true;
            base.WriteSurrogateCharEntity( lowChar, highChar );
        } 

        public override void WriteWhitespace( string ws ) { 
            mixedContent = true; 
            base.WriteWhitespace( ws );
        } 

        public override void WriteString( string text ) {
            mixedContent = true;
            base.WriteString( text ); 
        }
 
        public override void WriteChars( char[] buffer, int index, int count ) { 
            mixedContent = true;
            base.WriteChars( buffer, index, count ); 
        }

        public override void WriteRaw( char[] buffer, int index, int count ) {
            mixedContent = true; 
            base.WriteRaw( buffer, index, count );
        } 
 
        public override void WriteRaw( string data ) {
            mixedContent = true; 
            base.WriteRaw( data );
        }

        public override void WriteBase64( byte[] buffer, int index, int count ) { 
            mixedContent = true;
            base.WriteBase64( buffer, index, count ); 
        } 

// 
// Private methods
//
        private void Init( XmlWriterSettings settings ) {
            indentLevel = 0; 
            indentChars = settings.IndentChars;
            newLineOnAttributes = settings.NewLineOnAttributes; 
            mixedContentStack = new BitStack(); 

            // 
            if ( base.checkCharacters ) {
                if ( newLineOnAttributes ) {
                    base.ValidateContentChars( indentChars, "IndentChars", true );
                    base.ValidateContentChars( newLineChars, "NewLineChars", true ); 
                }
                else { 
                    base.ValidateContentChars( indentChars, "IndentChars", false ); 
                    if ( base.newLineHandling != NewLineHandling.Replace ) {
                        base.ValidateContentChars( newLineChars, "NewLineChars", false ); 
                    }
                }
            }
        } 

        // Add indentation to output.  Write newline and then repeat IndentChars for each indent level. 
        private void WriteIndent() { 
            RawText( base.newLineChars );
            for ( int i = indentLevel; i > 0; i-- ) { 
                RawText( indentChars );
            }
        }
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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