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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, nameof(writer));
_writer = writer;
}
public void Encode(byte[] buffer, int index, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (index < 0)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count > (buffer.Length - index))
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (_leftOverBytesCount > 0)
{
int leftOverBytesCount = _leftOverBytesCount;
while (leftOverBytesCount < 3 && count > 0)
{
_leftOverBytes[leftOverBytesCount++] = buffer[index++];
count--;
}
if (count == 0 && leftOverBytesCount < 3)
{
_leftOverBytesCount = leftOverBytesCount;
return;
}
int num2 = Convert.ToBase64CharArray(_leftOverBytes, 0, 3, _charsLine, 0);
WriteChars(_charsLine, 0, num2);
}
_leftOverBytesCount = count % 3;
if (_leftOverBytesCount > 0)
{
count -= _leftOverBytesCount;
if (_leftOverBytes == null)
{
_leftOverBytes = new byte[3];
}
for (int i = 0; i < _leftOverBytesCount; i++)
{
_leftOverBytes[i] = buffer[(index + count) + i];
}
}
int num4 = index + count;
int length = LineSizeInBytes;
while (index < num4)
{
if ((index + length) > num4)
{
length = num4 - index;
}
int num6 = Convert.ToBase64CharArray(buffer, index, length, _charsLine, 0);
WriteChars(_charsLine, 0, num6);
index += length;
}
}
public void Flush()
{
if (_leftOverBytesCount > 0)
{
int count = Convert.ToBase64CharArray(_leftOverBytes, 0, _leftOverBytesCount, _charsLine, 0);
WriteChars(_charsLine, 0, count);
_leftOverBytesCount = 0;
}
}
private void WriteChars(char[] chars, int index, int count)
{
_writer.Write(chars, index, count);
}
}
}
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