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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2016 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
/**
Parses data packets from a BLOCKS device, and translates them into callbacks
on a handler object
*/
template <typename Handler>
struct HostPacketDecoder
{
static void processNextPacket (Handler& handler, TopologyIndex deviceIndex, const void* data, int size)
{
if (Packed7BitArrayReader::checksumIsOK (static_cast<const uint8*> (data), (uint32) size))
{
Packed7BitArrayReader reader (data, size - 1);
if (reader.getRemainingBits() < (int) PacketTimestamp::bits)
{
jassertfalse; // not a valid message..
return;
}
auto packetTimestamp = reader.read<PacketTimestamp>();
deviceIndex &= 63; // top bit is used as a direction indicator
while (processNextMessage (handler, reader, deviceIndex, packetTimestamp))
{}
}
}
static bool processNextMessage (Handler& handler, Packed7BitArrayReader& reader,
TopologyIndex deviceIndex, PacketTimestamp packetTimestamp)
{
if (reader.getRemainingBits() < MessageType::bits)
return false;
auto messageType = reader.read<MessageType>().get();
if (messageType == 0)
return false;
switch ((MessageFromDevice) messageType)
{
case MessageFromDevice::deviceTopology: return handleTopology (handler, reader);
case MessageFromDevice::touchStart: return handleTouch (handler, reader, deviceIndex, packetTimestamp, true, false);
case MessageFromDevice::touchMove: return handleTouch (handler, reader, deviceIndex, packetTimestamp, false, false);
case MessageFromDevice::touchEnd: return handleTouch (handler, reader, deviceIndex, packetTimestamp, false, true);
case MessageFromDevice::touchStartWithVelocity: return handleTouchWithVelocity (handler, reader, deviceIndex, packetTimestamp, true, false);
case MessageFromDevice::touchMoveWithVelocity: return handleTouchWithVelocity (handler, reader, deviceIndex, packetTimestamp, false, false);
case MessageFromDevice::touchEndWithVelocity: return handleTouchWithVelocity (handler, reader, deviceIndex, packetTimestamp, false, true);
case MessageFromDevice::controlButtonDown: return handleButtonDownOrUp (handler, reader, deviceIndex, packetTimestamp, true);
case MessageFromDevice::controlButtonUp: return handleButtonDownOrUp (handler, reader, deviceIndex, packetTimestamp, false);
case MessageFromDevice::packetACK: return handlePacketACK (handler, reader, deviceIndex);
default:
jassertfalse; // got an invalid message type, could be a corrupt packet, or a
// message type that the host doesn't expect to get
return false;
}
}
static bool handleTopology (Handler& handler, Packed7BitArrayReader& reader)
{
if (reader.getRemainingBits() < DeviceCount::bits + ConnectionCount::bits)
{
jassertfalse; // not enough data available for this message type!
return false;
}
auto deviceProtocolVersion = reader.read<ProtocolVersion>();
if (deviceProtocolVersion > currentProtocolVersion)
{
jassertfalse;
return false;
}
const uint32 numDevices = reader.read<DeviceCount>();
const uint32 numConnections = reader.read<ConnectionCount>();
if ((uint32) reader.getRemainingBits() < numDevices * BitSizes::topologyDeviceInfo
+ numConnections * BitSizes::topologyConnectionInfo)
{
jassertfalse; // not enough data available for this message type!
return false;
}
handler.beginTopology ((int) numDevices, (int) numConnections);
for (uint32 i = 0; i < numDevices; ++i)
handleTopologyDevice (handler, reader);
for (uint32 i = 0; i < numConnections; ++i)
handleTopologyConnection (handler, reader);
handler.endTopology();
return true;
}
static void handleTopologyDevice (Handler& handler, Packed7BitArrayReader& reader)
{
DeviceStatus status;
for (uint32 i = 0; i < sizeof (BlockSerialNumber); ++i)
status.serialNumber.serial[i] = (uint8) reader.readBits (7);
status.index = (TopologyIndex) reader.readBits (topologyIndexBits);
status.batteryLevel = reader.read<BatteryLevel>();
status.batteryCharging = reader.read<BatteryCharging>();
handler.handleTopologyDevice (status);
}
static void handleTopologyConnection (Handler& handler, Packed7BitArrayReader& reader)
{
DeviceConnection connection;
connection.device1 = (uint8) reader.readBits (topologyIndexBits);
connection.port1 = reader.read<ConnectorPort>();
connection.device2 = (uint8) reader.readBits (topologyIndexBits);
connection.port2 = reader.read<ConnectorPort>();
handler.handleTopologyConnection (connection);
}
static bool handleTouch (Handler& handler, Packed7BitArrayReader& reader, TopologyIndex deviceIndex,
PacketTimestamp packetTimestamp, bool isStart, bool isEnd)
{
if (reader.getRemainingBits() < BitSizes::touchMessage - MessageType::bits)
{
jassertfalse; // not enough data available for this message type!
return false;
}
auto timeOffset = reader.read<PacketTimestampOffset>();
auto touchIndex = reader.read<TouchIndex>();
auto x = reader.read<TouchPosition::Xcoord>();
auto y = reader.read<TouchPosition::Ycoord>();
auto z = reader.read<TouchPosition::Zcoord>();
handleTouch (handler, deviceIndex, packetTimestamp.get() + timeOffset.get(),
touchIndex, { x, y, z }, { 0, 0, 0 }, isStart, isEnd);
return true;
}
static bool handleTouchWithVelocity (Handler& handler, Packed7BitArrayReader& reader, TopologyIndex deviceIndex,
PacketTimestamp packetTimestamp, bool isStart, bool isEnd)
{
if (reader.getRemainingBits() < BitSizes::touchMessageWithVelocity - MessageType::bits)
{
jassertfalse; // not enough data available for this message type!
return false;
}
auto timeOffset = reader.read<PacketTimestampOffset>();
auto touchIndex = reader.read<TouchIndex>();
auto x = reader.read<TouchPosition::Xcoord>();
auto y = reader.read<TouchPosition::Ycoord>();
auto z = reader.read<TouchPosition::Zcoord>();
auto vx = reader.read<TouchVelocity::VXcoord>();
auto vy = reader.read<TouchVelocity::VYcoord>();
auto vz = reader.read<TouchVelocity::VZcoord>();
handleTouch (handler, deviceIndex, packetTimestamp.get() + timeOffset.get(),
touchIndex, { x, y, z }, { vx, vy, vz }, isStart, isEnd);
return true;
}
static void handleTouch (Handler& handler, TopologyIndex deviceIndex, uint32 timestamp, TouchIndex touchIndex,
TouchPosition position, TouchVelocity velocity, bool isStart, bool isEnd)
{
handler.handleTouchChange (deviceIndex, timestamp, touchIndex, position, velocity, isStart, isEnd);
}
static bool handleButtonDownOrUp (Handler& handler, Packed7BitArrayReader& reader, TopologyIndex deviceIndex,
PacketTimestamp packetTimestamp, bool isDown)
{
if (reader.getRemainingBits() < BitSizes::controlButtonMessage - MessageType::bits)
{
jassertfalse; // not enough data available for this message type!
return false;
}
auto timeOffset = reader.read<PacketTimestampOffset>();
auto buttonID = reader.read<ControlButtonID>();
handler.handleControlButtonUpDown (deviceIndex, packetTimestamp.get() + timeOffset.get(), buttonID, isDown);
return true;
}
static bool handlePacketACK (Handler& handler, Packed7BitArrayReader& reader, TopologyIndex deviceIndex)
{
if (reader.getRemainingBits() < BitSizes::packetACK - MessageType::bits)
{
jassertfalse; // not enough data available for this message type!
return false;
}
handler.handlePacketACK (deviceIndex, reader.read<PacketCounter>());
return true;
}
};
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