IVGCVSW-3939 Code refactoring and minor fixes

 * Fixed value masking in SendPeriodicCounterCapturePacket and updated
   the pertinent unit tests
 * Code refactoring and cleanup
 * Added extra comments to the ProfilingService stop/reset procedure

Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>
Change-Id: Ibaf2fede76e06d5b8ce7258a4820a60e5993559f
diff --git a/src/profiling/test/SendCounterPacketTests.cpp b/src/profiling/test/SendCounterPacketTests.cpp
index 00dad38..f0ba347 100644
--- a/src/profiling/test/SendCounterPacketTests.cpp
+++ b/src/profiling/test/SendCounterPacketTests.cpp
@@ -217,11 +217,11 @@
     uint32_t headerWord1 = ReadUint32(readBuffer2, 4);
     uint64_t readTimestamp = ReadUint64(readBuffer2, 8);
 
-    BOOST_TEST(((headerWord0 >> 26) & 0x3F) == 1);   // packet family
-    BOOST_TEST(((headerWord0 >> 19) & 0x3F) == 0);   // packet class
-    BOOST_TEST(((headerWord0 >> 16) & 0x3) == 0);    // packet type
-    BOOST_TEST(headerWord1 == 8);                    // data length
-    BOOST_TEST(time == readTimestamp);               // capture period
+    BOOST_TEST(((headerWord0 >> 26) & 0x0000003F) == 1); // packet family
+    BOOST_TEST(((headerWord0 >> 19) & 0x0000007F) == 0); // packet class
+    BOOST_TEST(((headerWord0 >> 16) & 0x00000007) == 0); // packet type
+    BOOST_TEST(headerWord1 == 8);                        // data length
+    BOOST_TEST(time == readTimestamp);                   // capture period
 
     // Full packet message
     MockBufferManager mockBuffer3(512);
@@ -240,11 +240,11 @@
     headerWord1 = ReadUint32(readBuffer3, 4);
     uint64_t readTimestamp2 = ReadUint64(readBuffer3, 8);
 
-    BOOST_TEST(((headerWord0 >> 26) & 0x3F) == 1);   // packet family
-    BOOST_TEST(((headerWord0 >> 19) & 0x3F) == 0);   // packet class
-    BOOST_TEST(((headerWord0 >> 16) & 0x3) == 0);    // packet type
-    BOOST_TEST(headerWord1 == 38);                   // data length
-    BOOST_TEST(time == readTimestamp2);              // capture period
+    BOOST_TEST(((headerWord0 >> 26) & 0x0000003F) == 1); // packet family
+    BOOST_TEST(((headerWord0 >> 19) & 0x0000007F) == 0); // packet class
+    BOOST_TEST(((headerWord0 >> 16) & 0x00000007) == 0); // packet type
+    BOOST_TEST(headerWord1 == 38);                       // data length
+    BOOST_TEST(time == readTimestamp2);                  // capture period
 
     uint16_t counterIndex = 0;
     uint32_t counterValue = 100;