private void InitBase64Decoder()
{
if (_base64Decoder == null)
{
_base64Decoder = new Base64Decoder();
}
else
{
_base64Decoder.Reset();
}
_decoder = _base64Decoder;
}
public override async Task <int> ReadContentAsBase64Async(byte[] buffer, int index, int count)
{
switch (_state)
{
case State.Initial:
case State.EndOfFile:
case State.Closed:
case State.Error:
return(0);
case State.ClearNsAttributes:
case State.PopNamespaceScope:
switch (NodeType)
{
case XmlNodeType.Element:
throw CreateReadContentAsException("ReadContentAsBase64");
case XmlNodeType.EndElement:
return(0);
case XmlNodeType.Attribute:
if (_curNsAttr != -1 && reader.CanReadBinaryContent)
{
CheckBuffer(buffer, index, count);
if (count == 0)
{
return(0);
}
if (_nsIncReadOffset == 0)
{
// called first time on this ns attribute
if (_binDecoder != null && _binDecoder is Base64Decoder)
{
_binDecoder.Reset();
}
else
{
_binDecoder = new Base64Decoder();
}
}
if (_nsIncReadOffset == _curNode.value.Length)
{
return(0);
}
_binDecoder.SetNextOutputBuffer(buffer, index, count);
_nsIncReadOffset += _binDecoder.Decode(_curNode.value, _nsIncReadOffset, _curNode.value.Length - _nsIncReadOffset);
return(_binDecoder.DecodedCount);
}
goto case XmlNodeType.Text;
case XmlNodeType.Text:
Debug.Assert(AttributeCount > 0);
return(await reader.ReadContentAsBase64Async(buffer, index, count).ConfigureAwait(false));
default:
Debug.Assert(false);
return(0);
}
case State.Interactive:
_state = State.ReadContentAsBase64;
goto case State.ReadContentAsBase64;
case State.ReadContentAsBase64:
int read = await reader.ReadContentAsBase64Async(buffer, index, count).ConfigureAwait(false);
if (read == 0)
{
_state = State.Interactive;
ProcessNamespaces();
}
return(read);
case State.ReadContentAsBinHex:
case State.ReadElementContentAsBase64:
case State.ReadElementContentAsBinHex:
throw new InvalidOperationException(ResXml.Xml_MixingBinaryContentMethods);
default:
Debug.Assert(false);
return(0);
}
}