cmake: Add Findrhash.cmake

git-svn-id: https://svn.code.sf.net/p/speed-dreams/code/trunk@9540 30fe4595-0a0c-4342-8851-515496e4dcbd

Former-commit-id: 95341c293c88b1d8d45e351336983b3b152b238d
Former-commit-id: c834c4137793fb5d7e4e22ede64bf02c4e8686d0

cmake/Findrhash.cmake

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+# Copyright (C) 2024 Xavier Del Campo Romero
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+find_path(rhash_INCLUDE_DIRS
+    NAMES
+        rhash.h
+        rhash_torrent.h
+    HINTS
+        ENV rhash_PATH
+    PATH_SUFFIXES
+        include
+)
+
+find_library(rhash_LIBRARIES
+    NAMES
+        rhash
+    HINTS
+        ENV rhash_PATH
+    PATH_SUFFIXES
+        lib
+)
+
+include(FindPackageHandleStandardArgs)
+
+find_package_handle_standard_args(rhash
+    REQUIRED_VARS
+        rhash_LIBRARIES rhash_INCLUDE_DIRS
+)
+
+if(rhash_FOUND)
+    if(NOT TARGET rhash::rhash)
+        add_library(rhash::rhash INTERFACE IMPORTED)
+        target_include_directories(rhash::rhash
+            INTERFACE "${rhash_INCLUDE_DIRS}")
+        set_target_properties(rhash::rhash PROPERTIES
+            IMPORTED_LOCATION "${rhash_LIBRARIES}")
+    endif()
+endif()