From 1ec91bc214977c7d00a2eb1f418106dc034436a9 Mon Sep 17 00:00:00 2001
From: Richard Berger <richard.berger@temple.edu>
Date: Thu, 2 Apr 2020 14:22:04 -0400
Subject: [PATCH] Add CMake function GenerateBinaryHeader to replace xxd steps

---
 cmake/Modules/LAMMPSUtils.cmake | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/cmake/Modules/LAMMPSUtils.cmake b/cmake/Modules/LAMMPSUtils.cmake
index 3ea2b3cb7e..02de630c82 100644
--- a/cmake/Modules/LAMMPSUtils.cmake
+++ b/cmake/Modules/LAMMPSUtils.cmake
@@ -69,3 +69,19 @@ macro(pkg_depends PKG1 PKG2)
     message(FATAL_ERROR "${PKG1} package needs LAMMPS to be build with ${PKG2}")
   endif()
 endmacro()
+
+# CMake-only replacement for bin2c and xxd
+function(GenerateBinaryHeader varname outfile files)
+    message("Creating ${outfile}...")
+    file(WRITE ${outfile} "// CMake generated file\n")
+    math(EXPR ARG_END   "${ARGC}-1")
+
+    foreach(IDX RANGE 2 ${ARG_END})
+        list(GET ARGV ${IDX} filename)
+        file(READ ${filename} content HEX)
+        string(REGEX REPLACE "([0-9a-f][0-9a-f])" "0x\\1," content "${content}")
+        string(REGEX REPLACE ",$" "" content "${content}")
+        file(APPEND ${outfile} "const unsigned char ${varname}[] = { ${content} };\n")
+        file(APPEND ${outfile} "const unsigned int ${varname}_size = sizeof(${varname});\n")
+    endforeach()
+endfunction(GenerateBinaryHeader)