Implement dj::Receiver class

Again, many things were done here.

src/logid/backend/dj/Report.cpp

@@ -1,11 +1,12 @@
 #include <array>
 #include <algorithm>
+#include <cassert>
 #include "Report.h"
 
 using namespace logid::backend::dj;
 using namespace logid::backend;
 
-static const std::array<uint8_t, 35> DJReportDesc = {
+static const std::array<uint8_t, 34> DJReportDesc = {
         0xA1, 0x01,        // Collection (Application)
         0x85, 0x20,        //   Report ID (32)
         0x95, 0x0E,        //   Report Count (14)
@@ -25,8 +26,68 @@ static const std::array<uint8_t, 35> DJReportDesc = {
         0xC0               // End Collection
 };
 
-bool dj::supportsDjReports(std::vector<uint8_t>& rdesc)
+bool dj::supportsDjReports(std::vector<uint8_t>&& rdesc)
 {
     auto it = std::search(rdesc.begin(), rdesc.end(), DJReportDesc.begin(), DJReportDesc.end());
     return it != rdesc.end();
-}
+}
+
+Report::Report(std::vector<uint8_t>& data) : _data (data)
+{
+    switch(data[Offset::Type])
+    {
+        case ReportType::Short:
+            _data.resize(HeaderLength+ShortParamLength);
+            break;
+        case ReportType::Long:
+            _data.resize(HeaderLength+LongParamLength);
+            break;
+        default:
+            assert(false);
+    }
+}
+
+Report::Report(Report::Type type, hidpp::DeviceIndex index, uint8_t feature)
+{
+    switch(type)
+    {
+        case ReportType::Short:
+            _data.resize(HeaderLength+ShortParamLength);
+            break;
+        case ReportType::Long:
+            _data.resize(HeaderLength+LongParamLength);
+            break;
+        default:
+            assert(false);
+    }
+
+    _data[Offset::Type] = type;
+    _data[Offset::DeviceIndex] = index;
+    _data[Offset::Feature] = feature;
+}
+
+
+Report::Type Report::type() const
+{
+    return static_cast<Type>(_data[Offset::Type]);
+}
+
+hidpp::DeviceIndex Report::index() const
+{
+    return static_cast<hidpp::DeviceIndex>(_data[Offset::DeviceIndex]);
+}
+
+uint8_t Report::feature() const
+{
+    return _data[Offset::Feature];
+}
+
+std::vector<uint8_t>::iterator Report::paramBegin()
+{
+    return _data.begin() + Offset::Parameters;
+}
+
+std::vector<uint8_t> Report::rawData() const
+{
+    return _data;
+}