BamlVersionHeader.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Markup / BamlVersionHeader.cs / 1305600 / BamlVersionHeader.cs
                        

                        
                            /****************************************************************************\
*
* File: BamlVersionHeader.cs
* 
* Copyright (C) 2005 by Microsoft Corporation.  All rights reserved.
* 
\***************************************************************************/ 

using System; 
using System.IO;
using System.Globalization;
using System.Diagnostics;
 
using MS.Internal.IO.Packaging.CompoundFile;
 
#if PBTCOMPILER 
namespace MS.Internal.Markup
#else 
namespace System.Windows.Markup
#endif
{
    internal class BamlVersionHeader 
    {
        // The current BAML record version.  This is incremented whenever 
        // the BAML format changes 
        // Baml Format Breaking Changes should change this.
 
        internal static readonly VersionPair BamlWriterVersion;

        static BamlVersionHeader()
        { 
            // Initialize the Version number this way so that it can be
            // seen in the Lutz Reflector. 
            BamlWriterVersion = new VersionPair(0, 96); 
        }
 
        public BamlVersionHeader()
        {
            _bamlVersion = new FormatVersion("MSBAML", BamlWriterVersion);
        } 

        public FormatVersion BamlVersion 
        { 
            get { return _bamlVersion; }
#if !PBTCOMPILER 
            set { _bamlVersion = value; }
#endif
        }
 

        // This is used by Async loading to measure if the whole record is present 
        static public int BinarySerializationSize 
        {
            get 
            {
                // Unicode "MSBAML" = 12
                // + 4 bytes length header = 12 + 4 = 16
                // + 3*(16bit MinorVer + 16bit MajorVer) = 16+(3*(2+2))= 28 
                // For product stability the size of this data structure
                // shouldn't change anyway. 
                return 28; 
            }
        } 


#if !PBTCOMPILER
        internal void  LoadVersion(BinaryReader bamlBinaryReader) 
        {
#if DEBUG 
            long posStart = bamlBinaryReader.BaseStream.Position; 
#endif
 
            BamlVersion = FormatVersion.LoadFromStream(bamlBinaryReader.BaseStream);

#if DEBUG
            long posEnd = bamlBinaryReader.BaseStream.Position; 
            Debug.Assert((posEnd-posStart) == BamlVersionHeader.BinarySerializationSize,
                             "Incorrect Baml Version Header Size"); 
#endif 

            // We're assuming that only major versions are significant for compatibility, 
            // so if we have a major version in the file that is higher than that in
            // the code, we can't read it.
            if (BamlVersion.ReaderVersion != BamlWriterVersion)
            { 
                throw new InvalidOperationException(SR.Get(SRID.ParserBamlVersion,
                                         (BamlVersion.ReaderVersion.Major.ToString(CultureInfo.CurrentCulture) + "." + 
                                          BamlVersion.ReaderVersion.Minor.ToString(CultureInfo.CurrentCulture)), 
                                         (BamlWriterVersion.Major.ToString(CultureInfo.CurrentCulture) + "." +
                                          BamlWriterVersion.Minor.ToString(CultureInfo.CurrentCulture)))); 
            }
        }
#endif
 

        internal void WriteVersion(BinaryWriter bamlBinaryWriter) 
        { 
#if DEBUG
            long posStart = bamlBinaryWriter.BaseStream.Position; 
#endif
            BamlVersion.SaveToStream(bamlBinaryWriter.BaseStream);

#if DEBUG 
            long posEnd = bamlBinaryWriter.BaseStream.Position;
            if(-1 == posStart) 
            { 
                long length = bamlBinaryWriter.BaseStream.Length;
                Debug.Assert(length == BamlVersionHeader.BinarySerializationSize, 
                                 "Incorrect Baml Version Header Size");
            }
            else
            { 
                Debug.Assert((posEnd-posStart) == BamlVersionHeader.BinarySerializationSize,
                                 "Incorrect Baml Version Header Size"); 
            } 
#endif
 
        }

        FormatVersion _bamlVersion;
    } 
}
 
 

 

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

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