fixing missing pack/unpack closes #1

README.md

@@ -140,29 +140,24 @@ If you want to turn off the quota completely, pass `quota=false` instead.
 
 Use the `env` option to inject additional variables to the environment in which the sandboxed code is executed.
 
-```lua
-local msg = sandbox.run('return foo', {env = {foo = 'This is a global var on the the environment'}})
-```
+    local msg = sandbox.run('return foo', {env = {foo = 'This is a global var on the the environment'}})
 
 The `env` variable will be used as an "index" by the sandbox environment, but it will *not* be modified at all (changes
 to the environment are thus lost). The only way to "get information out" from the sandboxed environments are:
 
 Through side effects, like writing to a database. You will have to provide the side-effects functions in `env`:
 
-```lua
-local val = 1
-local env = { write_db = function(new_val) val = new_val end }
-sandbox.run('write_db(2)', { env = env })
-assert(val = 2)
-```
+    local val = 1
+    local env = { write_db = function(new_val) val = new_val end }
+    sandbox.run('write_db(2)')
+    assert(val = 2)
 
 Through returned values:
 
-```lua
-local env = { amount = 1 }
-local result = sandbox.run('return amount + 1', { env = env })
-assert(result = 2)
-```
+    local env = { amount = 1 }
+    local result = sandbox.run('return amount + 1', { env = env })
+    assert(result = 2)
+
 
 Installation
 ============

sandbox.lua

@@ -1,5 +1,5 @@
 local sandbox = {
-  _VERSION      = "sandbox 0.5",
+  _VERSION      = "sandbox 0.5.1",
   _DESCRIPTION  = "A pure-lua solution for running untrusted Lua code.",
   _URL          = "https://github.com/kikito/sandbox.lua",
   _LICENSE      = [[
@@ -29,6 +29,24 @@ local sandbox = {
 
 }
 
+-- 0.5.1 fixing missing pack and unpack functions for some Lua versions
+if not table.pack then
+  table.pack = function(...)
+    local t = {...}
+    t.n = select("#", ...)
+    return t
+  end
+end
+if not table.unpack then
+  table.unpack = function(tab, start, finish)
+    local result = {}
+    for i = start or 1, finish or #tab do
+      result[#result + 1] = tab[i]
+    end
+    return result
+  end
+end
+
 -- quotas don't work in LuaJIT since debug.sethook works differently there
 local quota_supported = type(_G.jit) == "nil"
 sandbox.quota_supported = quota_supported