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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// Description:
// XamlSerializer used to persist collections of integer indices in Baml
//
using System;
using System.IO;
#if PBTCOMPILER
using System.Reflection;
using System.Collections.Generic;
using TypeConverterHelper = MS.Internal.Markup.TypeConverterHelper;
namespace MS.Internal.Markup
#else
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Media3D;
using MS.Internal.Media;
using TypeConverterHelper = System.Windows.Markup.TypeConverterHelper;
namespace System.Windows.Markup
#endif
{
/// <summary>
/// XamlInt32CollectionSerializer is used to persist collections of integer indices in Baml
/// </summary>
internal class XamlInt32CollectionSerializer : XamlSerializer
{
//
// Internal only class.
// We actually create a class here - to avoid jitting for use of struct/value type
//
#if PBTCOMPILER
internal class IntegerMarkup
{
internal IntegerMarkup( int value)
{
_value = value;
}
internal int Value
{
get
{
return _value;
}
}
int _value;
}
#endif
#region Construction
/// <summary>
/// Constructor for XamlInt32CollectionSerializer
/// </summary>
public XamlInt32CollectionSerializer()
{
}
#endregion Construction
#region Conversions
/// <summary>
/// Convert a string into a compact binary representation and write it out
/// to the passed BinaryWriter.
/// </summary>
public override bool ConvertStringToCustomBinary (
BinaryWriter writer, // Writer into the baml stream
string stringValue) // String to convert
{
#if PBTCOMPILER
List<IntegerMarkup> ints = Parse( stringValue);
#else
Int32Collection ints = Int32Collection.Parse( stringValue );
#endif
int cur, last , count, max = 0 ;
count = ints.Count ;
// loop through the collection testing for
// if the numbers are consecutive, and what's the max.
bool consecutive = true;
bool allPositive = true ;
for ( int i = 1; i < count; i++)
{
#if PBTCOMPILER
last = ints[i-1].Value;
cur = ints[i].Value;
#else
last = ints.Internal_GetItem(i-1);
cur = ints.Internal_GetItem(i);
#endif
if ( consecutive && ( last + 1 != cur ))
{
consecutive = false;
}
//
// If any number is negative - we will just use Integer type.
//
// We could handle this by encoding the min/max and creating a different number of bit encoding.
// For now - we're seeing enough gains with this change.
//
if ( cur < 0 )
{
allPositive = false ;
}
if ( cur > max )
{
max = cur;
}
}
if ( consecutive )
{
writer.Write( (byte) IntegerCollectionType.Consecutive );
writer.Write( count ); // Write the count
// Write the first number.
#if PBTCOMPILER
writer.Write( ints[0].Value );
#else
writer.Write( ints.Internal_GetItem(0));
#endif
}
else
{
IntegerCollectionType type;
if ( allPositive && max <= 255 )
{
type = IntegerCollectionType.Byte;
}
else if ( allPositive && max <= UInt16.MaxValue )
{
type = IntegerCollectionType.UShort;
}
else
{
type = IntegerCollectionType.Integer;
}
writer.Write( (byte) type );
writer.Write( count ); // Write the count
switch( type )
{
case IntegerCollectionType.Byte:
{
for( int i = 0; i < count; i++ )
{
writer.Write( (byte)
#if PBTCOMPILER
ints[i].Value
#else
ints.Internal_GetItem(i)
#endif
) ;
}
}
break;
case IntegerCollectionType.UShort:
{
for( int i = 0; i < count; i++ )
{
writer.Write( (ushort)
#if PBTCOMPILER
ints[i].Value
#else
ints.Internal_GetItem(i)
#endif
);
}
}
break;
case IntegerCollectionType.Integer:
{
for( int i = 0; i < count; i++ )
{
writer.Write(
#if PBTCOMPILER
ints[i].Value
#else
ints.Internal_GetItem(i)
#endif
);
}
}
break;
}
}
return true;
}
#if PBTCOMPILER
public static List<IntegerMarkup> Parse(string source)
{
IFormatProvider formatProvider = TypeConverterHelper.InvariantEnglishUS;
TokenizerHelper th = new TokenizerHelper(source, formatProvider);
List<IntegerMarkup> resource = new List<IntegerMarkup>();
int value;
while (th.NextToken())
{
value = Convert.ToInt32(th.GetCurrentToken(), formatProvider);
resource.Add( new IntegerMarkup(value) );
}
return resource;
}
#endif
#if !PBTCOMPILER
/// <summary>
/// Convert a compact binary representation of a collection
/// into a Point3DCollection into and instance
/// </summary>
/// <remarks>
/// This is called ONLY from the Parser and is not a general public method.
/// </remarks>
public override object ConvertCustomBinaryToObject(
BinaryReader reader)
{
return DeserializeFrom( reader );
}
/// <summary>
/// Convert a compact binary representation of a collection
/// into a Point3DCollection into and instance
/// </summary>
/// <remarks>
/// This is called ONLY from the Parser and is not a general public method.
/// </remarks>
public static object StaticConvertCustomBinaryToObject(
BinaryReader reader)
{
return DeserializeFrom( reader );
}
private static Int32Collection DeserializeFrom( BinaryReader reader )
{
Int32Collection theCollection;
IntegerCollectionType type;
type = (IntegerCollectionType) reader.ReadByte();
int count = reader.ReadInt32();
if ( count < 0 )
{
throw new ArgumentException(SR.IntegerCollectionLengthLessThanZero);
}
theCollection = new Int32Collection( count );
if ( type == IntegerCollectionType.Consecutive )
{
// Get the first integer
int first = reader.ReadInt32();
for( int i = 0; i < count; i ++)
{
theCollection.Add( first + i );
}
}
else
{
switch( type )
{
case IntegerCollectionType.Byte :
{
for ( int i = 0; i < count; i++ )
{
theCollection.Add( (int) reader.ReadByte());
}
}
break;
case IntegerCollectionType.UShort :
{
for ( int i = 0; i < count; i++ )
{
theCollection.Add( (int) reader.ReadUInt16());
}
}
break;
case IntegerCollectionType.Integer :
{
for ( int i = 0; i < count; i++ )
{
int value = reader.ReadInt32();
theCollection.Add( value);
}
}
break;
default:
throw new ArgumentException(SR.UnknownIndexType);
}
}
return theCollection;
}
#endif
#endregion Conversions
internal enum IntegerCollectionType : byte
{
Unknown = 0,
Consecutive = 1,
Byte = 2,
UShort= 3,
Integer= 4
}
}
}
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