Newtonsoft.Json/Utilities/Base64Encoder.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.IO;

namespace Newtonsoft.Json.Utilities
{
    internal class Base64Encoder
    {
        private const int Base64LineSize = 76;
        private const int LineSizeInBytes = 57;

        private readonly char[] _charsLine = new char[Base64LineSize];
        private readonly TextWriter _writer;

        private byte[] _leftOverBytes;
        private int _leftOverBytesCount;

        public Base64Encoder(TextWriter writer)
        {
            ValidationUtils.ArgumentNotNull(writer, "writer");
            _writer = writer;
        }

        public void Encode(byte[] buffer, int index, int count)
        {
            if (buffer == null)
                throw new ArgumentNullException("buffer");

            if (index < 0)
                throw new ArgumentOutOfRangeException("index");

            if (count < 0)
                throw new ArgumentOutOfRangeException("count");

            if (count > (buffer.Length - index))
                throw new ArgumentOutOfRangeException("count");