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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / textformatting / CharacterBufferReference.cs / 1305600 / CharacterBufferReference.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation, 2003 // // File: CharacterBufferReference.cs // // Contents: Text Character buffer reference // // Spec: http://team/sites/Avalon/Specs/Text%20Formatting%20API.doc // // Created: 2-5-2004 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Diagnostics; using MS.Internal; using System.Security; using System.Security.Permissions; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media.TextFormatting { ////// Text character buffer reference /// public struct CharacterBufferReference : IEquatable{ private CharacterBuffer _charBuffer; private int _offsetToFirstChar; #region Constructor /// /// Construct character buffer reference from character array /// /// character array /// character buffer offset to the first character public CharacterBufferReference( char[] characterArray, int offsetToFirstChar ) : this( new CharArrayCharacterBuffer(characterArray), offsetToFirstChar ) {} ////// Construct character buffer reference from string /// /// character string /// character buffer offset to the first character public CharacterBufferReference( string characterString, int offsetToFirstChar ) : this( new StringCharacterBuffer(characterString), offsetToFirstChar ) {} ////// Construct character buffer reference from unsafe character string /// /// pointer to character string /// character length of unsafe string ////// Critical: This manipulates unsafe pointers and calls into the critical UnsafeStringCharacterBuffer ctor. /// PublicOK: The caller needs unmanaged code permission in order to pass unsafe pointers to us. /// [SecurityCritical] [CLSCompliant(false)] public unsafe CharacterBufferReference( char* unsafeCharacterString, int characterLength ) : this(new UnsafeStringCharacterBuffer(unsafeCharacterString, characterLength), 0) {} ////// Construct character buffer reference from memory buffer /// internal CharacterBufferReference( CharacterBuffer charBuffer, int offsetToFirstChar ) { if (offsetToFirstChar < 0) { throw new ArgumentOutOfRangeException("offsetToFirstChar", SR.Get(SRID.ParameterCannotBeNegative)); } // maximum offset is one less than CharacterBuffer.Count, except that zero is always a valid offset // even in the case of an empty or null character buffer int maxOffset = (charBuffer == null) ? 0 : Math.Max(0, charBuffer.Count - 1); if (offsetToFirstChar > maxOffset) { throw new ArgumentOutOfRangeException("offsetToFirstChar", SR.Get(SRID.ParameterCannotBeGreaterThan, maxOffset)); } _charBuffer = charBuffer; _offsetToFirstChar = offsetToFirstChar; } #endregion ////// Compute hash code /// public override int GetHashCode() { return _charBuffer != null ? _charBuffer.GetHashCode() ^ _offsetToFirstChar : 0; } ////// Test equality with the input object /// /// The object to test. public override bool Equals(object obj) { if (obj is CharacterBufferReference) { return Equals((CharacterBufferReference)obj); } return false; } ////// Test equality with the input CharacterBufferReference /// /// The characterBufferReference value to test public bool Equals(CharacterBufferReference value) { return _charBuffer == value._charBuffer && _offsetToFirstChar == value._offsetToFirstChar; } ////// Compare two CharacterBufferReference for equality /// /// left operand /// right operand ///whether or not two operands are equal public static bool operator == ( CharacterBufferReference left, CharacterBufferReference right ) { return left.Equals(right); } ////// Compare two CharacterBufferReference for inequality /// /// left operand /// right operand ///whether or not two operands are equal public static bool operator != ( CharacterBufferReference left, CharacterBufferReference right ) { return !(left == right); } internal CharacterBuffer CharacterBuffer { get { return _charBuffer; } } internal int OffsetToFirstChar { get { return _offsetToFirstChar; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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