SurrogateChar.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 / ndp / cdf / src / WCF / Serialization / System / Text / SurrogateChar.cs / 1305376 / SurrogateChar.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.Text
{ 
    using System.Globalization;
    using System.Runtime.Serialization; // Just for SR 
 
    struct SurrogateChar
    { 
        char lowChar;
        char highChar;

        public const int MinValue = 0x10000; 
        public const int MaxValue = MinValue + (1 << 20) - 1;
 
        const char surHighMin = (char) 0xd800; 
        const char surHighMax = (char) 0xdbff;
        const char surLowMin = (char) 0xdc00; 
        const char surLowMax = (char) 0xdfff;

        public SurrogateChar(int ch)
        { 
            if (ch < MinValue || ch > MaxValue)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidSurrogate, ch.ToString("X", CultureInfo.InvariantCulture)), "ch")); 
 
            const int mask = ((1 << 10) - 1);
 
            this.lowChar = (char) (((ch - MinValue) & mask) + surLowMin);
            this.highChar = (char) ((((ch - MinValue) >> 10) & mask) + surHighMin);
        }
 
        public SurrogateChar(char lowChar, char highChar)
        { 
            if (lowChar < surLowMin || lowChar > surLowMax) 
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidLowSurrogate, ((int)lowChar).ToString("X", CultureInfo.InvariantCulture)), "lowChar"));
 
            if (highChar < surHighMin || highChar > surHighMax)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidHighSurrogate, ((int)highChar).ToString("X", CultureInfo.InvariantCulture)), "highChar"));

            this.lowChar = lowChar; 
            this.highChar = highChar;
        } 
 
        public char LowChar { get { return lowChar; } }
        public char HighChar { get { return highChar; } } 

        public int Char
        {
            get 
            {
                return (lowChar - surLowMin) | ((highChar - surHighMin) << 10) + MinValue; 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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