Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Internal / DecoderFallbackWithFailureFlag.cs / 1305600 / DecoderFallbackWithFailureFlag.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: DecoderFallbackWithFailureFlag is used when the developer wants Encoding.GetChars() method to fail // without throwing an exception when decoding cannot be performed. // Usage pattern is: // DecoderFallbackWithFailureFlag fallback = new DecoderFallbackWithFailureFlag(); // Encoding e = Encoding.GetEncoding(codePage, EncoderFallback.ExceptionFallback, fallback); // e.GetChars(bytesToDecode); // if (fallback.HasFailed) // { // // Perform fallback and reset the failure flag. // fallback.HasFailed = false; // } // // History: // 05/03/2005 : mleonov - Created // //--------------------------------------------------------------------------- using System.Text; namespace MS.Internal { ////// This class is similar to the standard DecoderExceptionFallback class, /// except that for performance reasons it sets a Boolean failure flag /// instead of throwing exception. /// internal class DecoderFallbackWithFailureFlag : DecoderFallback { public DecoderFallbackWithFailureFlag() { } public override DecoderFallbackBuffer CreateFallbackBuffer() { return new FallbackBuffer(this); } ////// The maximum number of characters this instance can return. /// public override int MaxCharCount { get { return 0; } } ////// Returns whether decoding failed. /// public bool HasFailed { get { return _hasFailed; } set { _hasFailed = value; } } private bool _hasFailed; // false by default ////// A special implementation of DecoderFallbackBuffer that sets the failure flag /// in the parent DecoderFallbackWithFailureFlag class. /// private class FallbackBuffer : DecoderFallbackBuffer { public FallbackBuffer(DecoderFallbackWithFailureFlag parent) { _parent = parent; } ////// Indicates whether a substitute string can be emitted if an input byte sequence cannot be decoded. /// Parameters specify an input byte sequence, and the index position of a byte in the input. /// /// An input array of bytes. /// The index position of a byte in bytesUnknown. ///true if a string exists that can be inserted in the output /// instead of decoding the byte specified in bytesUnknown; /// false if the input byte should be ignored. public override bool Fallback(byte[] bytesUnknown, int index) { _parent.HasFailed = true; return false; } ////// Retrieves the next character in the fallback buffer. /// ///The next Unicode character in the fallback buffer. public override char GetNextChar() { return (char)0; } ////// Prepares the GetNextChar method to retrieve the preceding character in the fallback buffer. /// ///true if the MovePrevious operation was successful; otherwise, false. public override bool MovePrevious() { return false; } ////// Gets the number of characters in this instance of DecoderFallbackBuffer that remain to be processed. /// public override int Remaining { get { return 0; } } private DecoderFallbackWithFailureFlag _parent; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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