From 8d811913a52d51ade4b96674e02bb175cf2fc6e2 Mon Sep 17 00:00:00 2001
From: Castor215 <132155746+Castor215@users.noreply.github.com>
Date: Thu, 2 Nov 2023 00:57:10 +0000
Subject: [PATCH] externals: allow user to use system cryptopp (#7105)

---
 externals/CMakeLists.txt                      | 16 ++++++---
 .../cmake-modules/CitraHandleSystemLibs.cmake |  3 ++
 externals/cmake-modules/Findcryptopp.cmake    | 36 +++++++++++++++++++
 3 files changed, 50 insertions(+), 5 deletions(-)
 create mode 100644 externals/cmake-modules/Findcryptopp.cmake

diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 08aeffb7f..53dc89fdc 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -46,11 +46,17 @@ set(CATCH_INSTALL_EXTRAS OFF CACHE BOOL "")
 add_subdirectory(catch2)
 
 # Crypto++
-set(CRYPTOPP_BUILD_DOCUMENTATION OFF CACHE BOOL "")
-set(CRYPTOPP_BUILD_TESTING OFF CACHE BOOL "")
-set(CRYPTOPP_INSTALL OFF CACHE BOOL "")
-set(CRYPTOPP_SOURCES "${CMAKE_SOURCE_DIR}/externals/cryptopp" CACHE STRING "")
-add_subdirectory(cryptopp-cmake)
+if(USE_SYSTEM_CRYPTOPP)
+    find_package(cryptopp REQUIRED)
+    add_library(cryptopp INTERFACE)
+    target_link_libraries(cryptopp INTERFACE cryptopp::cryptopp)
+else()
+    set(CRYPTOPP_BUILD_DOCUMENTATION OFF CACHE BOOL "")
+    set(CRYPTOPP_BUILD_TESTING OFF CACHE BOOL "")
+    set(CRYPTOPP_INSTALL OFF CACHE BOOL "")
+    set(CRYPTOPP_SOURCES "${CMAKE_SOURCE_DIR}/externals/cryptopp" CACHE STRING "")
+    add_subdirectory(cryptopp-cmake)
+endif()
 
 # dds-ktx
 add_library(dds-ktx INTERFACE)
diff --git a/externals/cmake-modules/CitraHandleSystemLibs.cmake b/externals/cmake-modules/CitraHandleSystemLibs.cmake
index 13efe7eef..ad341586f 100644
--- a/externals/cmake-modules/CitraHandleSystemLibs.cmake
+++ b/externals/cmake-modules/CitraHandleSystemLibs.cmake
@@ -20,6 +20,7 @@ option(USE_SYSTEM_FFMPEG_HEADERS "Use the system FFmpeg headers (instead of the
 option(USE_SYSTEM_GLSLANG "Use the system glslang and SPIR-V libraries (instead of the bundled ones)" OFF)
 option(USE_SYSTEM_ZSTD "Use the system Zstandard library (instead of the bundled one)" OFF)
 option(USE_SYSTEM_ENET "Use the system libenet (instead of the bundled one)" OFF)
+option(USE_SYSTEM_CRYPTOPP "Use the system cryptopp (instead of the bundled one)" OFF)
 
 # Qt and MoltenVK are handled separately
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_SDL2 "Disable system SDL2" OFF "USE_SYSTEM_LIBS" OFF)
@@ -39,6 +40,7 @@ CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_FFMPEG_HEADERS "Disable system ffmpeg" OFF
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_GLSLANG "Disable system glslang" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_ZSTD "Disable system Zstandard" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_ENET "Disable system libenet" OFF "USE_SYSTEM_LIBS" OFF)
+CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_CRYPTOPP "Disable system cryptopp" OFF "USE_SYSTEM_LIBS" OFF)
 
 set(LIB_VAR_LIST
     SDL2
@@ -58,6 +60,7 @@ set(LIB_VAR_LIST
     GLSLANG
     ZSTD
     ENET
+    CRYPTOPP
     )
 
 # First, check that USE_SYSTEM_XXX is not used with USE_SYSTEM_LIBS
diff --git a/externals/cmake-modules/Findcryptopp.cmake b/externals/cmake-modules/Findcryptopp.cmake
new file mode 100644
index 000000000..eb17bed1d
--- /dev/null
+++ b/externals/cmake-modules/Findcryptopp.cmake
@@ -0,0 +1,36 @@
+if(NOT CRYPTOPP_FOUND)
+    pkg_check_modules(CRYPTOPP_TMP libcrypto++)
+
+    find_path(CRYPTOPP_INCLUDE_DIRS NAMES cryptlib.h
+            PATHS
+            ${CRYPTOPP_TMP_INCLUDE_DIRS}
+            /usr/include
+            /usr/include/crypto++
+            /usr/local/include
+            /usr/local/include/crypto++
+            )
+
+    find_library(CRYPTOPP_LIBRARY_DIRS NAMES crypto++
+            PATHS
+            ${CRYPTOPP_TMP_LIBRARY_DIRS}
+            /usr/lib
+            /usr/locallib
+            )
+
+    if(CRYPTOPP_INCLUDE_DIRS AND CRYPTOPP_LIBRARY_DIRS)
+        set(CRYPTOPP_FOUND TRUE CACHE INTERNAL "Found cryptopp")
+        message(STATUS "Found cryptopp: ${CRYPTOPP_LIBRARY_DIRS}, ${CRYPTOPP_INCLUDE_DIRS}")
+    else()
+        set(CRYPTOPP_FOUND FALSE CACHE INTERNAL "Found cryptopp")
+        message(STATUS "Cryptopp not found.")
+    endif()
+endif()
+
+if(CRYPTOPP_FOUND AND NOT TARGET cryptopp::cryptopp)
+    add_library(cryptopp::cryptopp UNKNOWN IMPORTED)
+    set_target_properties(cryptopp::cryptopp PROPERTIES
+        INCLUDE_DIRECTORIES ${CRYPTOPP_INCLUDE_DIRS}
+        INTERFACE_LINK_LIBRARIES ${CRYPTOPP_LIBRARY_DIRS}
+        IMPORTED_LOCATION ${CRYPTOPP_LIBRARY_DIRS}
+        )
+endif()