From 3dcfc5ee71761a90edbd32165725f38ffd323237 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Mon, 22 Jul 2019 01:58:57 +0200
Subject: util.bitops: Library to find appropriate bitwise library (closes
 #1395)

---
 util/bitcompat.lua | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 util/bitcompat.lua

(limited to 'util/bitcompat.lua')

diff --git a/util/bitcompat.lua b/util/bitcompat.lua
new file mode 100644
index 00000000..454181af
--- /dev/null
+++ b/util/bitcompat.lua
@@ -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";
-- 
cgit v1.2.3