From c50874c07b84feb80da6554fcee33f5493a96c94 Mon Sep 17 00:00:00 2001
From: Alfred Klomp <git@alfredklomp.com>
Date: Mon, 8 Jan 2024 22:59:57 +0100
Subject: [PATCH 1/3] Benchmark: Windows: get precise timestamp

---
 test/benchmark.c | 55 ++++++++++++++++++++++++++++++++++++------------
 1 file changed, 42 insertions(+), 13 deletions(-)

diff --git a/test/benchmark.c b/test/benchmark.c
index 80d21a38..7b26b7de 100644
--- a/test/benchmark.c
+++ b/test/benchmark.c
@@ -8,17 +8,24 @@
 #define _XOPEN_SOURCE   600
 #endif
 
+// Standard cross-platform includes.
 #include <stdbool.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <time.h>
 
-#ifdef __MACH__
-#include <mach/mach_time.h>
+// Platform-specific includes.
+#if defined(_WIN32) || defined(_WIN64)
+#  include <windows.h>
+#else
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#  include <fcntl.h>
+#  include <unistd.h>
+#  include <time.h>
+#endif
+
+#if defined(__MACH__)
+#  include <mach/mach_time.h>
 #endif
 
 #include "../include/libbase64.h"
@@ -84,12 +91,13 @@ get_random_data (struct buffers *b, char **errmsg)
 	return true;
 }
 
-#ifdef __MACH__
+#if defined(__MACH__)
 typedef uint64_t base64_timespec;
+
 static void
-base64_gettime (base64_timespec * o_time)
+base64_gettime (base64_timespec *t)
 {
-	*o_time = mach_absolute_time();
+	*t = mach_absolute_time();
 }
 
 static float
@@ -101,18 +109,39 @@ timediff_sec (base64_timespec *start, base64_timespec *end)
 
 	return (float)((diff * tb.numer) / tb.denom) / 1e9f;
 }
+#elif defined(_WIN32) || defined(_WIN64)
+typedef ULARGE_INTEGER base64_timespec;
+
+static void
+base64_gettime (base64_timespec *t)
+{
+	FILETIME current_time_ft;
+
+	GetSystemTimePreciseAsFileTime(&current_time_ft);
+
+	t->LowPart  = current_time_ft.dwLowDateTime;
+	t->HighPart = current_time_ft.dwHighDateTime;
+}
+
+static float
+timediff_sec (base64_timespec *start, base64_timespec *end)
+{
+	// Timer resolution is 100 nanoseconds (10^-7 sec).
+	return (end->QuadPart - start->QuadPart) / 1e7f;
+}
 #else
 typedef struct timespec base64_timespec;
+
 static void
-base64_gettime (base64_timespec * o_time)
+base64_gettime (base64_timespec *t)
 {
-	clock_gettime(CLOCK_REALTIME, o_time);
+	clock_gettime(CLOCK_REALTIME, t);
 }
 
 static float
 timediff_sec (base64_timespec *start, base64_timespec *end)
 {
-	return (end->tv_sec - start->tv_sec) + ((float)(end->tv_nsec - start->tv_nsec)) / 1e9f;
+	return (end->tv_sec - start->tv_sec) + (end->tv_nsec - start->tv_nsec) / 1e9f;
 }
 #endif
 

From ecebc7c25cfb3b48ae9eac0ded5b28a885a6f55f Mon Sep 17 00:00:00 2001
From: Alfred Klomp <git@alfredklomp.com>
Date: Mon, 8 Jan 2024 23:06:39 +0100
Subject: [PATCH 2/3] Benchmark: Windows: collect random data

---
 test/benchmark.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/test/benchmark.c b/test/benchmark.c
index 7b26b7de..e78b696b 100644
--- a/test/benchmark.c
+++ b/test/benchmark.c
@@ -16,6 +16,7 @@
 // Platform-specific includes.
 #if defined(_WIN32) || defined(_WIN64)
 #  include <windows.h>
+#  include <wincrypt.h>
 #else
 #  include <sys/types.h>
 #  include <sys/stat.h>
@@ -67,6 +68,27 @@ bytes_to_mb (size_t bytes)
 static bool
 get_random_data (struct buffers *b, char **errmsg)
 {
+#if defined(_WIN32) || defined(_WIN64)
+	HCRYPTPROV hProvider = 0;
+
+	if (!CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
+		*errmsg = "Error: CryptAcquireContext";
+		return false;
+	}
+
+	if (!CryptGenRandom(hProvider, b->regsz, b->reg)) {
+		CryptReleaseContext(hProvider, 0);
+		*errmsg = "Error: CryptGenRandom";
+		return false;
+	}
+
+	if (!CryptReleaseContext(hProvider, 0)) {
+		*errmsg = "Error: CryptReleaseContext";
+		return false;
+	}
+
+	return true;
+#else
 	int fd;
 	ssize_t nread;
 	size_t total_read = 0;
@@ -87,8 +109,10 @@ get_random_data (struct buffers *b, char **errmsg)
 		}
 		total_read += nread;
 	}
+
 	close(fd);
 	return true;
+#endif
 }
 
 #if defined(__MACH__)

From 54e3cbc81611907c749cf78316446ea18b851116 Mon Sep 17 00:00:00 2001
From: Alfred Klomp <git@alfredklomp.com>
Date: Mon, 8 Jan 2024 23:32:40 +0100
Subject: [PATCH 3/3] CI: benchmark: run on Windows targets through CTest

The benchmark program now compiles on Windows, so run it when CTest is
invoked, just like on other platforms.
---
 test/CMakeLists.txt | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index ef878704..f07b65a0 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -32,12 +32,10 @@ add_base64_test(test_base64
     test_base64.c
 )
 
-if (NOT WIN32)
-    add_base64_test(benchmark
-        codec_supported.c
-        benchmark.c
-    )
-endif()
+add_base64_test(benchmark
+    codec_supported.c
+    benchmark.c
+)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
     target_link_libraries(benchmark PRIVATE rt)