Fix. platform field supports values not only Windows/Unix.

README.md

@@ -11,7 +11,7 @@ Based on http://wiki.tcl.tk/15158
 - bit32 or bit
 - iconv (if not found then file names passed as is)
 - alien/ffi (on Windos detect system default codepage)
-- lunit (only for test)
+- lunitx (only for test)
 - [AesFileEncrypt] (https://github.com/moteus/lua-AesFileEncrypt) (optional)
 
 ## Supports ##
@@ -33,6 +33,7 @@ function make_reader(fname)
     isdir    = false,
     mtime    = 1348048902, -- lfs.attributes('modification') 
     exattrib = 32,         -- get from GetFileAttributesA
+    platform = 'fat32',    -- `exattrib` is platform dependent
   }
   return desc, desc.isfile and function()
     local chunk = f:read(chunk_size)
@@ -88,7 +89,7 @@ ZipStream = ZipWriter.new{
 
 ```
 
-
-
-[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/moteus/zipwriter/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
-
+
+
+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/moteus/zipwriter/trend.png)](https://bitdeli.com/free "Bitdeli Badge")
+

lakefile

@@ -1,3 +1,5 @@
+J = J or path.join
+
 if LUA_VER == '5.2' then
   LUA_NEED = 'lua52'
   LUA_DIR  = ENV.LUA_DIR_5_2 or ENV.LUA_DIR

lua/ZipWriter.lua

@@ -457,6 +457,7 @@ end
 -- @tfield number ctime
 -- @tfield number atime
 -- @tfield number exattrib on Windows it can be result of GetFileAttributes
+-- @tfield string platform
 -- @tfield ?string data file content
 
 ---
@@ -637,13 +638,18 @@ function ZipWriter:write(
   if use_aes then
     ver_made = ZIP_VERSION_EXTRACT["6.3"] -- @encrypt 7z do this
   else 
-    ver_made = IS_WINDOWS and ZIP_VERSION_EXTRACT["2.0"] or ZIP_VERSION_EXTRACT["2.0"]
+    ver_made = ZIP_VERSION_EXTRACT["2.0"]
   end
-  local made_by_win 
-  if not fileDesc.platform then made_by_win = IS_WINDOWS
-  else made_by_win = (fileDesc.platform:lower() == 'windows') end
 
-  ver_made   = bit.bor( ver_made, made_by_win and ZIP_VERSION_MADE.FAT32 or ZIP_VERSION_MADE.UNIX )
+  local platform_made = fileDesc.platform
+  if not platform_made then
+    platform_made = IS_WINDOWS and 'fat32' or 'unix'
+  elseif platform_made:lower() == 'windows' then
+    platform_made = 'fat32' -- for compatability
+  end
+  platform_made = ZIP_VERSION_MADE[platform_made:upper()] or ZIP_VERSION_MADE.UNIX
+
+  ver_made = bit.bor( ver_made, platform_made )
 
   if fileDesc.isfile then
     flags = bit.bor(flags, level.flag)