tex/context/base/mkxl/libs-imp-zstd.lmt


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if not modules then modules = { } end modules ['libs-imp-zstd'] = {
    version   = 1.001,
    comment   = "companion to luat-lib.mkxl",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

-- c:/data/develop/tex-context/tex/texmf-win64/bin/lib/luametatex/lua/copies/curl/libzstd.dll

-- require("libs-imp-zstd.lmt") -- only loads
--
-- local zstd = require("zstd") -- activates
--
-- local data = io.loaddata("t:/sources/char-def.lua")
-- local comp = zstd.compress  (data)
-- local back = zstd.decompress(comp)
--
-- print(#data,#comp,#back,#back==#data)

local libname = "zstd"
local libfile = "libzstd"

local zstdlib = resolvers.libraries.validoptional(libname)

if not zstdlib then return end

local zstd_compress   = zstdlib.compress
local zstd_decompress = zstdlib.decompress

local function okay()
    if resolvers.libraries.optionalloaded(libname,libfile) then
        okay = function() return true end
    else
        okay = function() return false end
    end
    return okay()
end

local zstd = {
    compress   = function (s) return okay() and zstd_compress  (s) end,
    decompress = function (s) return okay() and zstd_decompress(s) end,
}

package.loaded[libname] = zstd

return zstd