55 lines
1.9 KiB
Lua
55 lines
1.9 KiB
Lua
--
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-- xcursor.lua: X11 cursors
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--
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-- Copyright (c) 2021, Přemysl Eric Janouch <p@janouch.name>
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--
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-- Permission to use, copy, modify, and/or distribute this software for any
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-- purpose with or without fee is hereby granted.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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--
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local detect = function (c)
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return c:read (4) == "Xcur"
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end
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-- https://www.x.org/releases/current/doc/man/man3/Xcursor.3.xhtml
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local decode = function (c)
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if not detect (c) then error ("not an Xcursor file") end
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-- libXcursor shows that they are always little-endian
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c (1, 4):mark ("Xcursor magic")
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c.endianity = "le"
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local size = c:u32 ("header size: %d")
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-- TODO: check the version, although it is essentially set in stone
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-- as 1.0, with X.org being a nearly abandoned project
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local version = c:u32 ("file version: %s", function (u32)
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return "%d.%d", u32 >> 16, u32 & 0xffff
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end)
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local ntoc = c:u32 ("number of ToC entries: %d")
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local i
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for i = 1, ntoc do
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local start = c.position
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local type = c:u32 ("entry type: %s", function (u32)
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if u32 == 0xfffe0001 then return "comment" end
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if u32 == 0xfffd0002 then return "image" end
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return "unknown: %d", u32
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end)
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local subtype = c:u32 ("entry subtype: %d")
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local position = c:u32 ("chunk position: %d")
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c (start, c.position - 1):mark (("ToC entry %d"):format (i))
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end
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-- TODO: decode all entries as well
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end
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hex.register { type="xcursor", detect=detect, decode=decode }
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