// Internal methods
internal int ReadContentAsBase64(byte[] buffer, int index, int count)
{
// check arguments
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count");
}
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
if (buffer.Length - index < count)
{
throw new ArgumentOutOfRangeException("count");
}
switch (_state)
{
case State.None:
if (!_reader.CanReadContentAs())
{
throw _reader.CreateReadContentAsException("ReadContentAsBase64");
}
if (!Init())
{
return(0);
}
break;
case State.InReadContent:
// if we have a correct decoder, go read
if (_decoder == _base64Decoder)
{
// read more binary data
return(ReadContentAsBinary(buffer, index, count));
}
break;
case State.InReadElementContent:
throw new InvalidOperationException(ResXml.Xml_MixingBinaryContentMethods);
default:
Debug.Assert(false);
return(0);
}
Debug.Assert(_state == State.InReadContent);
// setup base64 decoder
InitBase64Decoder();
// read more binary data
return(ReadContentAsBinary(buffer, index, count));
}