CharacterBufferReference.cs source code in C# .NET

                        Code:
                         / 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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