--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/util/bitcompat.lua Mon Jul 22 01:58:57 2019 +0200
@@ -0,0 +1,32 @@
+-- Compatibility layer for bitwise operations
+
+-- First try the bit32 lib
+-- Lua 5.3 has it with compat enabled
+-- Lua 5.2 has it by default
+if _G.bit32 then
+ return _G.bit32;
+else
+ -- Lua 5.1 may have it as a standalone module that can be installed
+ local ok, bitop = pcall(require, "bit32")
+ if ok then
+ return bitop;
+ end
+end
+
+do
+ -- Lua 5.3 and 5.4 would be able to use native infix operators
+ local ok, bitop = pcall(require, "util.bit53")
+ if ok then
+ return bitop;
+ end
+end
+
+do
+ -- Lastly, try the LuaJIT bitop library
+ local ok, bitop = pcall(require, "bit")
+ if ok then
+ return bitop;
+ end
+end
+
+error "No bit module found. See https://prosody.im/doc/depends#bitop";