IncrementalReadDecoders.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Core / IncrementalReadDecoders.cs / 1 / IncrementalReadDecoders.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System.Diagnostics; 

namespace System.Xml { 

//
//  IncrementalReadDecoder abstract class
// 
    internal abstract class IncrementalReadDecoder {
        internal abstract int DecodedCount { get; } 
        internal abstract bool IsFull { get; } 
        internal abstract void SetNextOutputBuffer( Array array, int offset, int len );
        internal abstract int Decode( char[] chars, int startPos, int len ); 
        internal abstract int Decode( string str, int startPos, int len );
        internal abstract void Reset();
    }
 
//
//  Dummy IncrementalReadDecoder 
// 
    internal class IncrementalReadDummyDecoder : IncrementalReadDecoder {
        internal override int DecodedCount { get { return -1; } } 
        internal override bool IsFull { get { return false; } }
        internal override void SetNextOutputBuffer( Array array, int offset, int len ) {}
        internal override int Decode( char[] chars, int startPos, int len ) { return len; }
        internal override int Decode( string str, int startPos, int len ) { return len; } 
        internal override void Reset() {}
    } 
 
//
//  IncrementalReadDecoder for ReadChars 
//
    internal class IncrementalReadCharsDecoder : IncrementalReadDecoder {
        char[]  buffer;
        int     startIndex; 
        int     curIndex;
        int     endIndex; 
 
        internal IncrementalReadCharsDecoder() {
        } 

        internal override int DecodedCount {
            get {
                return curIndex - startIndex; 
            }
        } 
 
        internal override bool IsFull {
            get { 
                return curIndex == endIndex;
            }
        }
 
        internal override int Decode( char[] chars, int startPos, int len ) {
            Debug.Assert( chars != null ); 
            Debug.Assert( len >= 0 ); 
            Debug.Assert( startPos >= 0 );
            Debug.Assert( chars.Length - startPos >= len ); 

            Debug.Assert( len > 0 );

            int copyCount = endIndex - curIndex; 
            if ( copyCount > len ) {
                copyCount = len; 
            } 
            Buffer.BlockCopy( chars, startPos * 2, buffer, curIndex * 2, copyCount * 2 );
            curIndex += copyCount; 

            return copyCount;
        }
 
        internal override int Decode( string str, int startPos, int len ) {
            Debug.Assert( str != null ); 
            Debug.Assert( len >= 0 ); 
            Debug.Assert( startPos >= 0 );
            Debug.Assert( str.Length - startPos >= len ); 

            Debug.Assert( len > 0 );

            int copyCount = endIndex - curIndex; 
            if ( copyCount > len ) {
                copyCount = len; 
            } 
            str.CopyTo( startPos, buffer, curIndex, copyCount );
            curIndex += copyCount; 

            return copyCount;
        }
 
        internal override void Reset() {
        } 
 
        internal override void SetNextOutputBuffer( Array buffer, int index, int count ) {
            Debug.Assert( buffer != null ); 
            Debug.Assert( count >= 0 );
            Debug.Assert( index >= 0 );
            Debug.Assert( buffer.Length - index >= count );
 
            Debug.Assert( ( buffer as char[] ) != null );
            this.buffer = (char[])buffer; 
            this.startIndex = index; 
            this.curIndex = index;
            this.endIndex = index + count; 
        }
    }

} 

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

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