57 lines
2.2 KiB
C#
57 lines
2.2 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Text
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{
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using System.Globalization;
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using System.Runtime.Serialization; // Just for SR
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struct SurrogateChar
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{
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char lowChar;
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char highChar;
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public const int MinValue = 0x10000;
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public const int MaxValue = MinValue + (1 << 20) - 1;
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const char surHighMin = (char)0xd800;
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const char surHighMax = (char)0xdbff;
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const char surLowMin = (char)0xdc00;
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const char surLowMax = (char)0xdfff;
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public SurrogateChar(int ch)
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{
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if (ch < MinValue || ch > MaxValue)
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throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidSurrogate, ch.ToString("X", CultureInfo.InvariantCulture)), "ch"));
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const int mask = ((1 << 10) - 1);
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this.lowChar = (char)(((ch - MinValue) & mask) + surLowMin);
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this.highChar = (char)((((ch - MinValue) >> 10) & mask) + surHighMin);
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}
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public SurrogateChar(char lowChar, char highChar)
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{
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if (lowChar < surLowMin || lowChar > surLowMax)
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throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidLowSurrogate, ((int)lowChar).ToString("X", CultureInfo.InvariantCulture)), "lowChar"));
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if (highChar < surHighMin || highChar > surHighMax)
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throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.XmlInvalidHighSurrogate, ((int)highChar).ToString("X", CultureInfo.InvariantCulture)), "highChar"));
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this.lowChar = lowChar;
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this.highChar = highChar;
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}
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public char LowChar { get { return lowChar; } }
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public char HighChar { get { return highChar; } }
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public int Char
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{
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get
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{
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return (lowChar - surLowMin) | ((highChar - surHighMin) << 10) + MinValue;
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}
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}
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}
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}
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