From 047ad315da93e8af655f849b5a3c5a5254eac8d4 Mon Sep 17 00:00:00 2001
From: Dorian Zedler <dorian@itsblue.de>
Date: Wed, 6 Jul 2022 20:35:10 +0200
Subject: [PATCH] Feat: Start to add benchmarking

---
 Implementierung/lib/helper.h | 16 ++++++++++++++++
 Implementierung/src/helper.c | 17 ++++++++++++++++-
 Implementierung/src/main.c   | 14 ++++++++------
 3 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/Implementierung/lib/helper.h b/Implementierung/lib/helper.h
index 90ddbc4..6d5ecfb 100644
--- a/Implementierung/lib/helper.h
+++ b/Implementierung/lib/helper.h
@@ -1,11 +1,15 @@
 #ifndef HELPER_H
 #define HELPER_H
+#define _POSIX_C_SOURCE 200809L
 
 #include <errno.h>
 #include <getopt.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
+
+#include "md2.h"
 
 enum argumentParseResult {
   RESULT_OK = 0,
@@ -31,4 +35,16 @@ struct configuration {
 enum argumentParseResult parseArguments(int argc, char** argv,
                                         struct configuration* c);
 
+/**
+ * @brief Run an md2_hash_func with benchmark timing
+ *
+ * @param func the function to run
+ * @param len the lenght of buf
+ * @param buf the data to hash
+ * @param out the target array for the hash
+ * @return double
+ */
+double run_benchmark(md2_hash_func func, size_t len, uint8_t* buf,
+                     uint8_t* out);
+
 #endif  // HELPER_H
\ No newline at end of file
diff --git a/Implementierung/src/helper.c b/Implementierung/src/helper.c
index f809aa5..a32625a 100644
--- a/Implementierung/src/helper.c
+++ b/Implementierung/src/helper.c
@@ -38,7 +38,7 @@ enum argumentParseResult parseArguments(int argc, char **argv,
 
   while (1) {
     static struct option longOptions[] = {{"help", no_argument, NULL, 'h'},
-                                          NULL};
+                                          {NULL}};
     int longOptionIndex = 0;
 
     opt = getopt_long(argc, argv, "V:B::h", longOptions, &longOptionIndex);
@@ -85,4 +85,19 @@ enum argumentParseResult parseArguments(int argc, char **argv,
   }
 
   return RESULT_OK;
+}
+
+double current_time(void) {
+  struct timespec t;
+  clock_gettime(CLOCK_MONOTONIC, &t);
+  return t.tv_sec + t.tv_nsec * 1e-9;
+}
+
+double run_benchmark(md2_hash_func func, size_t len, uint8_t *buf,
+                     uint8_t *out) {
+  double start = current_time();
+  func(len, buf, out);
+  double end = current_time();
+
+  return end - start;
 }
\ No newline at end of file
diff --git a/Implementierung/src/main.c b/Implementierung/src/main.c
index c1afb63..8ab1411 100644
--- a/Implementierung/src/main.c
+++ b/Implementierung/src/main.c
@@ -7,14 +7,15 @@
 // Returns true when val is approx. equal to exp.
 static bool runTest(const char* message, const char* expectedHash) {
   uint8_t out[16];
-  md2_hash(strlen(message), message, out);
+  double duration =
+      run_benchmark(md2_hash, strlen(message), (uint8_t*)message, out);
 
   char hash[32];
   md2_encode_hash(out, hash);
 
-  bool ok = !strcmp(hash, expectedHash);
-  printf("%s: md2(%s) %s == %s\n", "not ok" + (4 * ok), message, hash,
-         expectedHash);
+  bool ok = !strncmp(hash, expectedHash, 32);
+  printf("%s: md2(%s) %s == %s, took: %f\n", "not ok" + (4 * ok), message, hash,
+         expectedHash, duration);
   return ok;
 }
 
@@ -85,12 +86,13 @@ int main(int argc, char** argv) {
   printf("\n");
 
   uint8_t out[16];
-  md2_hash(len, data, out);
+  double duration = run_benchmark(md2_hash, len, data, out);
 
   printf("Hash: ");
   char hash[32];
   md2_encode_hash(out, hash);
-  printf("%s\n", hash);
+
+  printf("%s, took: %f\n", hash, duration);
 
   free(data);