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authorKim Alvefur <zash@zash.se>2019-11-23 23:12:01 +0100
committerKim Alvefur <zash@zash.se>2019-11-23 23:12:01 +0100
commit72f1544f6d7301d1313c333f1147b27e242063df (patch)
tree1a5b57117c8c88f05ebb8b67a0d2848988b7620c /util/bitcompat.lua
parent7ac5e467baa7ebc557ed3a07bdca7dc9ade0c1db (diff)
parentdfa2bdffc083faa597509d7f35125c41f6ffbc9d (diff)
downloadprosody-72f1544f6d7301d1313c333f1147b27e242063df.tar.gz
prosody-72f1544f6d7301d1313c333f1147b27e242063df.zip
Merge 0.11->trunk
Diffstat (limited to 'util/bitcompat.lua')
-rw-r--r--util/bitcompat.lua32
1 files changed, 32 insertions, 0 deletions
diff --git a/util/bitcompat.lua b/util/bitcompat.lua
new file mode 100644
index 00000000..454181af
--- /dev/null
+++ b/util/bitcompat.lua
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+-- 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";