-- -- xcursor.lua: X11 cursors -- -- Copyright (c) 2021, Přemysl Eric Janouch
-- -- Permission to use, copy, modify, and/or distribute this software for any -- purpose with or without fee is hereby granted. -- -- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES -- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF -- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY -- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION -- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN -- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -- local detect = function (c) return c:read (4) == "Xcur" end -- https://www.x.org/releases/current/doc/man/man3/Xcursor.3.xhtml local decode = function (c) if not detect (c) then error ("not an Xcursor file") end -- libXcursor shows that they are always little-endian c (1, 4):mark ("Xcursor magic") c.endianity = "le" local size = c:u32 ("header size: %d") -- TODO: check the version, although it is essentially set in stone -- as 1.0.0, with X.org being a nearly abandoned project local version = c:u32 ("file version: %s", function (u32) return "%d.%d.%d", u32 >> 16, (u32 >> 8) & 255, u32 & 255 end) local ntoc = c:u32 ("number of ToC entries: %d") local i for i = 1, ntoc do local start = c.position local type = c:u32 ("entry type: %s", function (u32) if u32 == 0xfffe0001 then return "comment" end if u32 == 0xfffd0002 then return "image" end return "unknown: %d", u32 end) local subtype = c:u32 ("entry subtype: %d") local position = c:u32 ("chunk position: %d") c (start, c.position - 1):mark (("ToC entry %d"):format (i)) end -- TODO: decode all entries as well end hex.register { type="xcursor", detect=detect, decode=decode }