fix missing api

APIs/cif.lua

@@ -0,0 +1,63 @@
+FFI = require("ffi")
+FFI.type  = {}
+FFI.type.VOID       = 0
+FFI.type.UINT8      = 1
+FFI.type.SINT8      = 2
+FFI.type.UINT16     = 3
+FFI.type.SINT16     = 4
+FFI.type.UINT32     = 5
+FFI.type.SINT32     = 6
+FFI.type.UINT64     = 7
+FFI.type.SINT64     = 8
+FFI.type.FLOAT      = 9
+FFI.type.DOUBLE     = 10
+FFI.type.UCHAR      = 11
+FFI.type.SCHAR      = 12
+FFI.type.USHORT     = 13
+FFI.type.SSHORT     = 14
+FFI.type.UINT       = 15
+FFI.type.SINT       = 16
+FFI.type.ULONG      = 17
+FFI.type.SLONG      = 18
+FFI.type.LONGDOUBLE = 19
+FFI.type.POINTER    = 20
+FFI.cache = {}
+
+FFI.load = function(path)
+    if FFI.cache[path] then
+        return FFI.cache[path]
+    else
+        print("Loading: "..path)
+        local lib = FFI.dlopen(path)
+        if lib then
+            FFI.cache[path] = {ref = lib, fn= {}}
+        end
+        return FFI.cache[path]
+    end
+end
+
+FFI.unload = function(path)
+    local lib = FFI.cache[path]
+    if lib then
+        FFI.dlclose(lib.ref)
+        FFI.cache[path] = false
+    end
+end
+
+FFI.unloadAll = function()
+    for k,v in pairs(FFI.cache) do
+        FFI.dlclose(v.ref)
+    end
+    FFI.cache = {}
+end
+
+FFI.lookup = function(lib, name)
+    local fn = lib.fn[name]
+    if fn then return fn end
+    fn = FFI.dlsym(lib.ref, name)
+    if fn then
+        lib.fn[name] = fn
+        return fn
+    end
+    return nil
+end