UshortList2.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Shaping / UshortList2.cs / 1305600 / UshortList2.cs
                        
                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Avalon
//  Copyright (C) Microsoft Corporation, 2002
// 
//  File:      List2.cs
// 
//  Contents:  Internal growable list with sublisting 
//
//  Created:   11-04-2002 Worachai Chaoweeraprasit (wchao) 
//             16-07-2002 sergeym  - major rewrite.
//
//-----------------------------------------------------------------------
 
using System.Windows;
using System; 
using System.Collections; 
using System.Diagnostics;
using MS.Internal; 
using System.Security;
using System.Security.Permissions;

namespace MS.Internal.Shaping 
{
    ///  
    /// Growable ushort array. 
    /// Only current sublist is visible for client. Sublists should be processed
    /// in sequence from start to end. 
    /// 
    internal class UshortList
    {
        internal UshortList(int capacity, int leap) 
        {
            Invariant.Assert(capacity >= 0 && leap >= 0, "Invalid parameter"); 
            _storage = new UshortArray(capacity, leap); 
        }
 
        internal UshortList(ushort[] array)
        {
            Invariant.Assert(array != null, "Invalid parameter");
            _storage = new UshortArray(array); 
        }
 
        internal UshortList(CheckedUShortPointer unsafeArray, int arrayLength) 
        {
            _storage = new UnsafeUshortArray(unsafeArray, arrayLength); 
            _length = arrayLength;
        }

        ///  
        ///     Critical: This code accepts pointers and manipulates
        ///     them without validation.Critical for set only 
        ///     TreatAsSafe: The method does proper bound check. 
        /// 
        public ushort this[int index] 
        {
            [SecurityCritical,SecurityTreatAsSafe]
            get
            { 
                Invariant.Assert(index >= 0  &&  index < _length, "Index out of range");
                return _storage[_index + index]; 
            } 
            [SecurityCritical,SecurityTreatAsSafe]
            set 
            {
                Invariant.Assert(index >= 0  &&  index < _length, "Index out of range");
                _storage[_index + index] = value;
            } 
        }
 
        ///  
        /// Length of current sublist
        ///  
        /// 
        ///     Critical: This code accepts pointers and manipulates
        ///     them without validation, critical only for set
        ///  
        public int Length
        { 
            get { return _length; } 
            [SecurityCritical]
            set { _length = value; } 
        }

        /// 
        /// Offset inside whole storage 
        /// 
        public int Offset 
        { 
            get { return _index; }
        } 

        /// 
        /// Reset processing sequence to the start of the storage
        ///  
        public void SetRange(int index, int length)
        { 
            Invariant.Assert(length >= 0 && (index + length) <= _storage.Length, "List out of storage"); 
            _index  = index;
            _length = length; 
        }

        /// 
        /// Insert elements to the current run. Elements are not intialized. 
        /// 
        /// Position 
        /// Number of elements 
        public void Insert(int index, int count)
        { 
            Invariant.Assert(index <= _length && index >= 0, "Index out of range");
            Invariant.Assert(count > 0, "Invalid argument");

            _storage.Insert(_index + index, count, _index + _length); 
            _length += count;
        } 
 

        ///  
        /// Remove elements from the current run.
        /// 
        /// Position
        /// Number of elements 
        public void Remove(int index, int count)
        { 
            Invariant.Assert(index < _length && index >= 0, "Index out of range"); 
            Invariant.Assert(count > 0 && (index + count) <= _length, "Invalid argument");
 
            _storage.Remove(_index + index, count, _index + _length);
            _length -= count;
        }
 
        public ushort[] ToArray()
        { 
            return _storage.ToArray(); 
        }
 
        public ushort[] GetCopy()
        {
            return _storage.GetSubsetCopy(_index,_length);
        } 

        private UshortBuffer    _storage; 
        private int             _index; 
        private int             _length;
    } 


    /// 
    /// Abstract ushort buffer 
    /// 
    internal abstract class UshortBuffer 
    { 
        protected int _leap;
 
        public abstract ushort this[int index] { get; set; }
        public abstract int Length { get; }

        public virtual ushort[] ToArray() 
        {
            Debug.Assert(false, "Not supported"); 
            return null; 
        }
 
        public virtual ushort[] GetSubsetCopy(int index, int count)
        {
            Debug.Assert(false, "Not supported");
            return null; 
        }
 
        public virtual void Insert(int index, int count, int length) 
        {
            Debug.Assert(false, "Not supported"); 
        }

        public virtual void Remove(int index, int count, int length)
        { 
            Debug.Assert(false, "Not supported");
        } 
    } 

 
    /// 
    /// Ushort buffer implemented as managed ushort array
    /// 
    internal class UshortArray : UshortBuffer 
    {
        private ushort[]    _array; 
 
        internal UshortArray(ushort[] array)
        { 
            _array = array;
        }

        internal UshortArray(int capacity, int leap) 
        {
            _array = new ushort[capacity]; 
            _leap = leap; 
        }
 
        public override ushort this[int index]
        {
            get { return _array[index];  }
            set { _array[index] = value; } 
        }
 
        public override int Length 
        {
            get { return _array.Length; } 
        }

        public override ushort[] ToArray()
        { 
            return _array;
        } 
 
        public override ushort[] GetSubsetCopy(int index, int count)
        { 
            ushort[] subsetArray = new ushort[count];

            //Move elements
            Buffer.BlockCopy( 
                _array,
                index * sizeof(ushort), 
                subsetArray, 
                0,
                ((index + count) <= _array.Length ? count : _array.Length) * sizeof(ushort) 
                );

            return subsetArray;
        } 

        public override void Insert(int index, int count, int length) 
        { 
            int newLength = length + count;
 
            if (newLength > _array.Length)
            {
                Invariant.Assert(_leap > 0, "Growing an ungrowable list!");
 
                //increase storage by integral number of _leaps.
                int extra = newLength - _array.Length; 
                int newArraySize = _array.Length + ((extra - 1) / _leap + 1) * _leap; 

                // get a new buffer 
                ushort[] newArray = new ushort[newArraySize];

                //Move elements
                Buffer.BlockCopy(_array, 0, newArray, 0, index * sizeof(ushort)); 

                if (index < length) 
                { 
                    Buffer.BlockCopy(
                        _array, 
                        index * sizeof(ushort),
                        newArray,
                        (index + count) * sizeof(ushort),
                        (length - index) * sizeof(ushort) 
                        );
                } 
 
                _array = newArray;
            } 
            else
            {
                if (index < length)
                { 
                    Buffer.BlockCopy(
                        _array, 
                        index * sizeof(ushort), 
                        _array,
                        (index + count) * sizeof(ushort), 
                        (length - index) * sizeof(ushort)
                        );
                }
            } 
        }
 
        public override void Remove(int index, int count, int length) 
        {
            Buffer.BlockCopy( 
                _array,
                (index + count) * sizeof(ushort),
                _array,
                (index) * sizeof(ushort), 
                (length - index - count) * sizeof(ushort)
                ); 
        } 
    }
 

    /// 
    /// Ushort buffer implemented as unmanaged ushort array
    ///  
    internal unsafe class UnsafeUshortArray : UshortBuffer
    { 
        ///  
        ///     Critical:Holds reference to a pointer
        ///  
        [SecurityCritical]
        private ushort*     _array;

        ///  
        ///     Critical:Can be used to cause a buffer overrun
        ///  
        private SecurityCriticalDataForSet         _arrayLength; 

 
        /// 
        ///     Critical: This code probes into checked pointer.
        ///     Safe    : The pointer is validated at probing.
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        internal UnsafeUshortArray(CheckedUShortPointer array, int arrayLength) 
        { 
            _array = array.Probe(0, arrayLength);
            _arrayLength.Value = arrayLength; 
        }


        ///  
        ///     Critical: This code accepts pointers and manipulates
        ///     them without validation.Critical for set only 
        ///     Safe    : Setter does propery bound check. 
        /// 
        public override ushort this[int index] 
        {
            [SecurityCritical,SecurityTreatAsSafe]
            get
            { 
                Invariant.Assert(index >= 0 && index < _arrayLength.Value);
                return _array[index]; 
            } 
            [SecurityCritical, SecurityTreatAsSafe]
            set 
            {
                Invariant.Assert(index >= 0 && index < _arrayLength.Value);
                _array[index] = value;
            } 
        }
 
        public override int Length 
        {
            get { return _arrayLength.Value; } 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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