CharacterString.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 / CharacterString.cs / 1305600 / CharacterString.cs
                        
                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2003
// 
//  File:      CharacterBufferRange.cs
// 
//  Contents:  A range of character buffer 
//
//  Spec:      http://team/sites/Avalon/Specs/Text%20Formatting%20API.doc 
//
//  Created:   2-5-2004 Worachai Chaoweeraprasit (wchao)
//
//----------------------------------------------------------------------- 

 
using System; 
using System.Diagnostics;
using System.Security; 
using MS.Internal;
using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID;
 

namespace System.Windows.Media.TextFormatting 
{ 
    /// 
    /// A string of characters 
    /// 
    public struct CharacterBufferRange : IEquatable
    {
        private CharacterBufferReference    _charBufferRef; 
        private int                         _length;
 
        #region Constructor 

 
        /// 
        /// Construct character buffer reference from character array
        /// 
        /// character array 
        /// character buffer offset to the first character
        /// character length 
        public CharacterBufferRange( 
            char[]      characterArray,
            int         offsetToFirstChar, 
            int         characterLength
            )
            : this(
                new CharacterBufferReference(characterArray, offsetToFirstChar), 
                characterLength
                ) 
        {} 

 
        /// 
        /// Construct character buffer reference from string
        /// 
        /// character string 
        /// character buffer offset to the first character
        /// character length 
        public CharacterBufferRange( 
            string      characterString,
            int         offsetToFirstChar, 
            int         characterLength
            )
            : this(
                new CharacterBufferReference(characterString, offsetToFirstChar), 
                characterLength
                ) 
        {} 

 
        /// 
        /// Construct character buffer reference from unsafe character string
        /// 
        /// pointer to character string 
        /// character length
        ///  
        /// Critical: this stores a pointer to an unmanaged string of characters 
        /// PublicOK: The caller needs unmanaged code permission in order to pass unsafe pointers to us.
        ///  
        [SecurityCritical]
        [CLSCompliant(false)]
        public unsafe CharacterBufferRange(
            char*       unsafeCharacterString, 
            int         characterLength
            ) 
            : this( 
                new CharacterBufferReference(unsafeCharacterString, characterLength),
                characterLength 
                )
        {}

 
        /// 
        /// Construct a character string from character buffer reference 
        ///  
        /// character buffer reference
        /// number of characters 
        internal CharacterBufferRange(
            CharacterBufferReference    characterBufferReference,
            int                         characterLength
            ) 
        {
            if (characterLength < 0) 
            { 
                throw new ArgumentOutOfRangeException("characterLength", SR.Get(SRID.ParameterCannotBeNegative));
            } 

            int maxLength = (characterBufferReference.CharacterBuffer != null) ?
                characterBufferReference.CharacterBuffer.Count - characterBufferReference.OffsetToFirstChar :
                0; 

            if (characterLength > maxLength) 
            { 
                throw new ArgumentOutOfRangeException("characterLength", SR.Get(SRID.ParameterCannotBeGreaterThan, maxLength));
            } 

            _charBufferRef = characterBufferReference;
            _length = characterLength;
        } 

 
        ///  
        /// Construct a character string from part of another character string
        ///  
        internal CharacterBufferRange(
            CharacterBufferRange    characterBufferRange,
            int                     offsetToFirstChar,
            int                     characterLength 
            ) :
            this ( 
                characterBufferRange.CharacterBuffer, 
                characterBufferRange.OffsetToFirstChar + offsetToFirstChar,
                characterLength 
                )
        {}

 
        /// 
        /// Construct a character string object from string 
        ///  
        internal CharacterBufferRange(
            string charString 
            ) :
            this(
                new StringCharacterBuffer(charString),
                0, 
                charString.Length
                ) 
        {} 

 
        /// 
        /// Construct character buffer from memory buffer
        /// 
        internal CharacterBufferRange( 
            CharacterBuffer     charBuffer,
            int                 offsetToFirstChar, 
            int                 characterLength 
            ) :
            this( 
                new CharacterBufferReference(charBuffer, offsetToFirstChar),
                characterLength
                )
        {} 

 
        ///  
        /// Construct a character string object by extracting text info from text run
        ///  
        internal CharacterBufferRange(TextRun textRun)
        {
            _charBufferRef = textRun.CharacterBufferReference;
            _length = textRun.Length; 
        }
 
        #endregion 

 
        /// 
        /// Compute hash code
        /// 
        public override int GetHashCode() 
        {
            return _charBufferRef.GetHashCode() ^ _length; 
        } 

 
        /// 
        /// Test equality with the input object
        /// 
        ///  The object to test  
        public override bool Equals(object obj)
        { 
            if (obj is CharacterBufferRange) 
            {
                return Equals((CharacterBufferRange)obj); 
            }
            return false;
        }
 

        ///  
        /// Test equality with the input CharacterBufferRange 
        /// 
        ///  The CharacterBufferRange value to test  
        public bool Equals(CharacterBufferRange value)
        {
            return  _charBufferRef.Equals(value._charBufferRef)
                &&  _length == value._length; 
        }
 
 

        ///  
        /// Compare two CharacterBufferRange for equality
        /// 
        /// left operand
        /// right operand 
        /// whether or not two operands are equal
        public static bool operator == ( 
            CharacterBufferRange  left, 
            CharacterBufferRange  right
            ) 
        {
            return left.Equals(right);
        }
 
        /// 
        /// Compare two CharacterBufferRange for inequality 
        ///  
        /// left operand
        /// right operand 
        /// whether or not two operands are equal
        public static bool operator != (
            CharacterBufferRange  left,
            CharacterBufferRange  right 
            )
        { 
            return !(left == right); 
        }
 
        /// 
        /// reference to the character buffer of a string
        /// 
        public CharacterBufferReference CharacterBufferReference 
        {
            get { return _charBufferRef; } 
        } 

 
        /// 
        /// number of characters in text source character store
        /// 
        public int Length 
        {
            get { return _length; } 
        } 

 
        /// 
        /// Getting an empty character string
        /// 
        public static CharacterBufferRange Empty 
        {
            get { return new CharacterBufferRange(); } 
        } 

 
        /// 
        /// Indicate whether the character string object contains no information
        /// 
        internal bool IsEmpty 
        {
            get { return _charBufferRef.CharacterBuffer == null || _length <= 0; } 
        } 

 
        /// 
        /// character memory buffer
        /// 
        internal CharacterBuffer CharacterBuffer 
        {
            get { return _charBufferRef.CharacterBuffer; } 
        } 

 
        /// 
        /// character offset relative to the beginning of buffer to
        /// the first character of the run.
        ///  
        internal int OffsetToFirstChar
        { 
            get { return _charBufferRef.OffsetToFirstChar; } 
        }
 

        /// 
        /// Return a character from the range, index is relative to the beginning of the range
        ///  
        internal char this[int index]
        { 
            get 
            {
                Invariant.Assert(index >= 0 && index < _length); 
                return _charBufferRef.CharacterBuffer[_charBufferRef.OffsetToFirstChar + index];
            }
        }
    } 
}
 

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

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