From 2467c4f815629c1042ee54de9db6a89e26ae5739 Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Sun, 23 Apr 2023 19:23:47 +0200
Subject: [PATCH] Make use of platform-specific APIs for optimizing CopyHelper
 configurable

There might be unexpected limitations like
https://github.com/Martchus/cpp-utilities/issues/24. To be able to at least
workaround those limitations it makes sense to allow disabling the
optimization completely.
---
 CMakeLists.txt | 6 ++++++
 io/copy.h      | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 763d654..65d4d45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -195,6 +195,12 @@ if (NOT ENABLE_THREAD_LOCAL)
         PROPERTY COMPILE_DEFINITIONS ${META_PROJECT_VARNAME}_NO_THREAD_LOCAL)
 endif ()
 
+# configure use of platform-specific APIs for optimizing CopyHelper
+option(USE_PLATFORM_SPECIFIC_API_FOR_OPTIMIZING_COPY_HELPER "enables use of platform-specific APIs for optimizing CopyHelper" ON)
+if (USE_PLATFORM_SPECIFIC_API_FOR_OPTIMIZING_COPY_HELPER)
+    list(APPEND META_PUBLIC_COMPILE_DEFINITIONS ${META_PROJECT_VARNAME}_USE_PLATFORM_SPECIFIC_API_FOR_OPTIMIZING_COPY_HELPER)
+endif ()
+
 # include modules to apply configuration
 include(BasicConfig)
 include(WindowsResources)
diff --git a/io/copy.h b/io/copy.h
index 6edae23..134484b 100644
--- a/io/copy.h
+++ b/io/copy.h
@@ -2,7 +2,7 @@
 #define IOUTILITIES_COPY_H
 
 #include "./nativefilestream.h"
-#if defined(CPP_UTILITIES_USE_NATIVE_FILE_BUFFER) && defined(PLATFORM_LINUX)
+#if defined(CPP_UTILITIES_USE_PLATFORM_SPECIFIC_API_FOR_OPTIMIZING_COPY_HELPER) && defined(CPP_UTILITIES_USE_NATIVE_FILE_BUFFER) && defined(PLATFORM_LINUX)
 #define CPP_UTILITIES_USE_SEND_FILE
 #include "../conversion/stringbuilder.h"
 #endif