SerializationHelper.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Ink / InkSerializedFormat / SerializationHelper.cs / 1305600 / SerializationHelper.cs
                        
                        
                            using MS.Utility; 
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows; 

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID; 

namespace MS.Internal.Ink.InkSerializedFormat 
{
    /// 
    /// Summary description for HelperMethods.
    ///  
    internal static class SerializationHelper
    { 
        ///  
        /// returns the no of byte it requires to mutlibyte encode a uint value
        ///  
        /// 
        /// 
        public static uint VarSize(uint Value)
        { 
            if (Value < 0x80)
                return 1; 
            else if (Value < 0x4000) 
                return 2;
            else if (Value < 0x200000) 
                return 3;
            else if (Value < 0x10000000)
                return 4;
            else 
                return 5;
        } 
 

        ///  
        /// MultiByte Encodes an uint Value into the stream
        /// 
        /// 
        ///  
        /// 
        public static uint Encode(Stream strm, uint Value) 
        { 
            ulong ib = 0;
 
            for (; ; )
            {
                if (Value < 128)
                { 
                    strm.WriteByte((byte)Value);
                    return (uint)(ib + 1); 
                } 

                strm.WriteByte((byte)(0x0080 | (Value & 0x7f))); 
                Value >>= 7;
                ib++;
            }
        } 

 
        ///  
        /// Multibyte encodes a unsinged long value in the stream
        ///  
        /// 
        /// 
        /// 
        public static uint EncodeLarge(Stream strm, ulong ulValue) 
        {
            uint ib = 0; 
 
            for (; ; )
            { 
                if (ulValue < 128)
                {
                    strm.WriteByte((byte)ulValue);
                    return ib + 1; 
                }
 
                strm.WriteByte((byte)(0x0080 | (ulValue & 0x7f))); 
                ulValue >>= 7;
                ib++; 
            }
        }

 
        /// 
        /// Multibyte encodes a signed integer value into a stream. Use 1's complement to 
        /// store signed values.  This means both 00 and 01 are actually 0, but we don't 
        /// need to encode all negative numbers as 64 bit values.
        ///  
        /// 
        /// 
        /// 
        // Use 1's complement to store signed values.  This means both 00 and 01 are 
        // actually 0, but we don't need to encode all negative numbers as 64 bit values.
        public static uint SignEncode(Stream strm, int Value) 
        { 
            ulong ull = 0;
 
            // special case LONG_MIN
            if (-2147483648 == Value)
            {
                ull = 0x0000000100000001; 
            }
            else 
            { 
                ull = (ulong)Math.Abs(Value);
 
                // multiply by 2
                ull <<= 1;

                // For -ve nos, add 1 
                if (Value < 0)
                    ull |= 1; 
            } 

            return EncodeLarge(strm, ull); 
        }

        /// 
        /// Decodes a multi byte encoded unsigned integer from the stream 
        /// 
        ///  
        ///  
        /// 
        public static uint Decode(Stream strm, out uint dw) 
        {
            int shift = 0;
            byte b = 0;
            uint cb = 0; 

            dw = 0; 
            do 
            {
                b = (byte)strm.ReadByte(); 
                cb++;
                dw += (uint)((int)(b & 0x7f) << shift);
                shift += 7;
            } while (((b & 0x80) > 0) && (shift < 29)); 

            return cb; 
        } 

 
        /// 
        /// Decodes a multibyte encoded unsigned long from the stream
        /// 
        ///  
        /// 
        ///  
        public static uint DecodeLarge(Stream strm, out ulong ull) 
        {
            long ull1; 
            int shift = 0;
            byte b = 0, a = 0;
            uint cb = 0;
 
            ull = 0;
            do 
            { 
                b = (byte)strm.ReadByte();
                cb++; 
                a = (byte)(b & 0x7f);
                ull1 = a;
                ull |= (ulong)(ull1 << shift);
                shift += 7; 
            } while (((b & 0x80) > 0) && (shift < 57));
 
            return cb; 
        }
 

        /// 
        /// Decodes a multibyte encoded signed integer from the stream
        ///  
        /// 
        ///  
        ///  
        public static uint SignDecode(Stream strm, out int i)
        { 
            i = 0;

            ulong ull = 0;
            uint cb = DecodeLarge(strm, out ull); 

            if (cb > 0) 
            { 
                bool fneg = false;
 
                if ((ull & 0x0001) > 0)
                    fneg = true;

                ull = ull >> 1; 

                long l = (long)ull; 
 
                i = (int)(fneg ? -l : l);
            } 

            return cb;
        }
 
        /// 
        /// Converts the CLR type information into a COM-compatible type enumeration 
        ///  
        /// The CLR type information of the object to convert
        /// Throw an exception if unknown type is used 
        /// The COM-compatible type enumeration
        /// Only supports the types of data that are supported in ISF ExtendedProperties
        public static VarEnum ConvertToVarEnum(Type type, bool throwOnError)
        { 
            if (typeof(char) == type)
            { 
                return VarEnum.VT_I1; 
            }
            else if (typeof(char[]) == type) 
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_I1);
            }
            else if (typeof(byte) == type) 
            {
                return VarEnum.VT_UI1; 
            } 
            else if (typeof(byte[]) == type)
            { 
                return (VarEnum.VT_ARRAY | VarEnum.VT_UI1);
            }
            else if (typeof(Int16) == type)
            { 
                return VarEnum.VT_I2;
            } 
            else if (typeof(Int16[]) == type) 
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_I2); 
            }
            else if (typeof(UInt16) == type)
            {
                return VarEnum.VT_UI2; 
            }
            else if (typeof(UInt16[]) == type) 
            { 
                return (VarEnum.VT_ARRAY | VarEnum.VT_UI2);
            } 
            else if (typeof(Int32) == type)
            {
                return VarEnum.VT_I4;
            } 
            else if (typeof(Int32[]) == type)
            { 
                return (VarEnum.VT_ARRAY | VarEnum.VT_I4); 
            }
            else if (typeof(UInt32) == type) 
            {
                return VarEnum.VT_UI4;
            }
            else if (typeof(UInt32[]) == type) 
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_UI4); 
            } 
            else if (typeof(Int64) == type)
            { 
                return VarEnum.VT_I8;
            }
            else if (typeof(Int64[]) == type)
            { 
                return (VarEnum.VT_ARRAY | VarEnum.VT_I8);
            } 
            else if (typeof(UInt64) == type) 
            {
                return VarEnum.VT_UI8; 
            }
            else if (typeof(UInt64[]) == type)
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_UI8); 
            }
            else if (typeof(Single) == type) 
            { 
                return VarEnum.VT_R4;
            } 
            else if (typeof(Single[]) == type)
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_R4);
            } 
            else if (typeof(Double) == type)
            { 
                return VarEnum.VT_R8; 
            }
            else if (typeof(Double[]) == type) 
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_R8);
            }
            else if (typeof(DateTime) == type) 
            {
                return VarEnum.VT_DATE; 
            } 
            else if (typeof(DateTime[]) == type)
            { 
                return (VarEnum.VT_ARRAY | VarEnum.VT_DATE);
            }
            else if (typeof(Boolean) == type)
            { 
                return VarEnum.VT_BOOL;
            } 
            else if (typeof(Boolean[]) == type) 
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_BOOL); 
            }
            else if (typeof(String) == type)
            {
                return VarEnum.VT_BSTR; 
            }
            else if (typeof(Decimal) == type) 
            { 
                return VarEnum.VT_DECIMAL;
            } 
            else if (typeof(Decimal[]) == type)
            {
                return (VarEnum.VT_ARRAY | VarEnum.VT_DECIMAL);
            } 
            else
            { 
                if (throwOnError) 
                {
                    throw new ArgumentException(SR.Get(SRID.InvalidDataTypeForExtendedProperty)); 
                }
                else
                {
                    return VarEnum.VT_UNKNOWN; 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SerializationHelper.cs source code in C# .NET

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