///////////////////////////////////////////////////////////////////////////////
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//

namespace Microsoft.Singularity.Security.AccessControl
{
    using System;

    /// <summary>
    /// Base class for reading bytes from a stream/string.
    /// </summary>
    internal abstract class DataReader
    {
        // closes the reader
        public void Close()
        {
            Dispose(true);
        }

        protected virtual void Dispose(bool disposing)
        {
        }

        // Returns the next available character without actually reading it from
        // the underlying medium. The returned value is -1 if no further
        // characters are available.
        public abstract int Peek();

        // Reads the next character from the underlying medium. The returned value
        // is -1 if no further characters are available.
        public abstract int Read();

        // Reads a block of characters. This method will read up to count
        // characters from the reader into the buffer character
        // array starting at position index. Returns the actual number of
        // characters read, or zero if the end of the medium is reached.
        public abstract int Read(char[] buffer, int index, int count);
    }
}