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* libscopeprotocols                                                                                                    *
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* Copyright (c) 2012-2023 Andrew D. Zonenberg and contributors                                                         *
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#include "../scopehal/scopehal.h"
#include "IBM8b10bDecoder.h"
#include "EthernetProtocolDecoder.h"
#include "Ethernet1000BaseXDecoder.h"
#include <algorithm>

using namespace std;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Construction / destruction

Ethernet1000BaseXDecoder::Ethernet1000BaseXDecoder(const string& color)
	: EthernetProtocolDecoder(color)
{
	//Digital inputs, so need to undo some stuff for the PHY layer decodes
	m_signalNames.clear();
	m_inputs.clear();

	//Add inputs. We take a single 8b10b coded stream
	CreateInput("data");
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Accessors

string Ethernet1000BaseXDecoder::GetProtocolName()
{
	return "Ethernet - 1000BaseX";
}

bool Ethernet1000BaseXDecoder::ValidateChannel(size_t i, StreamDescriptor stream)
{
	if(stream.m_channel == NULL)
		return false;

	if( (i == 0) && (dynamic_cast<IBM8b10bWaveform*>(stream.m_channel->GetData(0)) != NULL) )
		return true;

	return false;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Actual decoder logic

void Ethernet1000BaseXDecoder::Refresh()
{
	ClearPackets();

	//Get the input data
	if(!VerifyAllInputsOK())
	{
		SetData(NULL, 0);
		return;
	}
	auto data = dynamic_cast<IBM8b10bWaveform*>(GetInputWaveform(0));
	data->PrepareForCpuAccess();

	//Create the output capture
	auto cap = new EthernetWaveform;
	cap->m_timescale = data->m_timescale;
	cap->m_startTimestamp = data->m_startTimestamp;
	cap->m_startFemtoseconds = data->m_startFemtoseconds;
	cap->PrepareForCpuAccess();

	size_t len = data->m_samples.size();
	for(size_t i=0; i < len; i++)
	{
		//Ignore idles and autonegotiation for now

		auto symbol = data->m_samples[i];

		//Set of recovered bytes and timestamps
		vector<uint8_t> bytes;
		vector<uint64_t> starts;
		vector<uint64_t> ends;

		//K27.7 is a start-of-frame
		if(symbol.m_control && (symbol.m_data == 0xfb) )
		{
			bytes.push_back(0x55);
			starts.push_back(data->m_offsets[i]);
			ends.push_back(data->m_offsets[i] + data->m_durations[i]);
		}

		//Discard anything else
		else
			continue;

		i++;

		//Decode frame data until we see a control or error character.
		//Any control character would mean end-of-frame or error.
		bool error = false;
		while(i < len)
		{
			symbol = data->m_samples[i];

			//Expect K29.7 end of frame
			if(symbol.m_control)
			{
				if(symbol.m_data != 0xfd)
					error = true;
				break;
			}

			bytes.push_back(symbol.m_data);
			starts.push_back(data->m_offsets[i]);
			ends.push_back(data->m_offsets[i] + data->m_durations[i]);
			i++;
		}

		//TODO: if error, create a single giant "ERROR" frame block? or what

		//Crunch the data
		if(!error)
			BytesToFrames(bytes, starts, ends, cap);
	}

	SetData(cap, 0);
	cap->MarkModifiedFromCpu();
}
