Added pure parsing benchmark (#1887)

* Added benchmark for pure parsing performance (all packets are preloaded into memory)

* Lint

* Update Examples/PcapPlusPlus-benchmark/README.md

* Removed using namespace pcpp in new benchmark.

* Update Examples/PcapPlusPlus-benchmark/benchmark-google.cpp

Author: Dimi1010

Examples/PcapPlusPlus-benchmark/README.md

@@ -9,11 +9,12 @@ A benchmark application used for measuring PcapPlusPlus performance can be found
 
 ## Directly benchmark PcapPlusPlus
 
-Another application integrates with the Google Benchmark library and can be found in `benchmark-google.cpp`. This application currently consists of four different benchmarks, and each benchmark can be influenced by various factors. These benchmarks aim to utilize different influence factors to provide accurate results for different scenarios. You can check the table below for more information. For performance-critical applications using PcapPlusPlus, it is recommended to run benchmarks in your specific environment for more accurate results. Using larger pcap files and those with diverse protocols and sessions can provide better insights into PcapPlusPlus performance in your setup.
+Another application integrates with the Google Benchmark library and can be found in `benchmark-google.cpp`. This application currently consists of five different benchmarks, and each benchmark can be influenced by various factors. These benchmarks aim to utilize different influence factors to provide accurate results for different scenarios. You can check the table below for more information. For performance-critical applications using PcapPlusPlus, it is recommended to run benchmarks in your specific environment for more accurate results. Using larger pcap files and those with diverse protocols and sessions can provide better insights into PcapPlusPlus performance in your setup.
 
-|     Benchmark     |   Operation   |  Influencing factors |
-|:-----------------:|:-------------:|:--------------------:|
-| BM_PcapFileRead   |     Read      |  CPU + Disk (Read)   |
-| BM_PcapFileWrite  |     Write     |  CPU + Disk (Write)  |
-| BM_PacketParsing  | Read + Parse  |  CPU + Disk (Read)   |
-| BM_PacketCrafting |     Craft     |        CPU           |
+|     Benchmark        |   Operation   |  Influencing factors |
+|:-----------------:   |:-------------:|:--------------------:|
+| BM_PcapFileRead      |     Read      |  CPU + Disk (Read)   |
+| BM_PcapFileWrite     |     Write     |  CPU + Disk (Write)  |
+| BM_PacketParsing     | Read + Parse  |  CPU + Disk (Read)   |
+| BM_PacketPureParsing |     Parse     |        CPU           |
+| BM_PacketCrafting    |     Craft     |        CPU           |

Examples/PcapPlusPlus-benchmark/benchmark-google.cpp

@@ -142,6 +142,51 @@ static void BM_PacketParsing(benchmark::State& state)
 }
 BENCHMARK(BM_PacketParsing);
 
+static void BM_PacketPureParsing(benchmark::State& state)
+{
+	pcpp::PcapFileReaderDevice reader(pcapFileName);
+	if (!reader.open())
+	{
+		state.SkipWithError("Cannot open pcap file for reading");
+		return;
+	}
+
+	// Preloads all packets into memory
+	pcpp::RawPacketVector rawPackets;
+	reader.getNextPackets(rawPackets);
+
+	if (rawPackets.size() == 0)
+	{
+		state.SkipWithError("No packets to parse");
+		return;
+	}
+
+	size_t totalProcessedItems = 0;
+	size_t totalProcessedBytes = 0;
+	size_t currentPacketIndex = 0;
+	for (auto _ : state)
+	{
+		pcpp::RawPacket* rawPacket = rawPackets.at(currentPacketIndex);
+
+		pcpp::Packet parsedPacket(rawPacket);
+
+		benchmark::DoNotOptimize(parsedPacket.getFirstLayer());
+
+		++totalProcessedItems;
+		totalProcessedBytes += rawPacket->getRawDataLen();
+		++currentPacketIndex;
+
+		if (currentPacketIndex >= rawPackets.size())
+		{
+			currentPacketIndex = 0;  // Loop back to the start
+		}
+	}
+
+	state.SetBytesProcessed(totalProcessedBytes);
+	state.SetItemsProcessed(totalProcessedItems);
+}
+BENCHMARK(BM_PacketPureParsing);
+
 static void BM_PacketCrafting(benchmark::State& state)
 {
 	size_t totalBytes = 0;