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if not modules then modules = { } end modules ['l-md5'] = {
version = 1.001,
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This also provides file checksums and checkers.
if not md5 then
md5 = optionalrequire("md5")
end
if not md5 then
md5 = {
sum = function(str) print("error: md5 is not loaded (sum ignored)") return str end,
sumhexa = function(str) print("error: md5 is not loaded (sumhexa ignored)") return str end,
}
end
local md5, file = md5, file
local gsub, format, byte = string.gsub, string.format, string.byte
local md5sum = md5.sum
local function convert(str,fmt)
return (gsub(md5sum(str),".",function(chr) return format(fmt,byte(chr)) end))
end
if not md5.HEX then function md5.HEX(str) return convert(str,"%02X") end end
if not md5.hex then function md5.hex(str) return convert(str,"%02x") end end
if not md5.dec then function md5.dec(str) return convert(str,"%03i") end end
-- local P, Cs, lpegmatch = lpeg.P, lpeg.Cs,lpeg.match
--
-- if not md5.HEX then
-- local function remap(chr) return format("%02X",byte(chr)) end
-- function md5.HEX(str) return (gsub(md5.sum(str),".",remap)) end
-- end
--
-- if not md5.hex then
-- local function remap(chr) return format("%02x",byte(chr)) end
-- function md5.hex(str) return (gsub(md5.sum(str),".",remap)) end
-- end
--
-- if not md5.dec then
-- local function remap(chr) return format("%03i",byte(chr)) end
-- function md5.dec(str) return (gsub(md5.sum(str),".",remap)) end
-- end
-- if not md5.HEX then
-- local pattern_HEX = Cs( ( P(1) / function(chr) return format("%02X",byte(chr)) end)^0 )
-- function md5.HEX(str) return lpegmatch(pattern_HEX,md5.sum(str)) end
-- end
--
-- if not md5.hex then
-- local pattern_hex = Cs( ( P(1) / function(chr) return format("%02x",byte(chr)) end)^0 )
-- function md5.hex(str) return lpegmatch(pattern_hex,md5.sum(str)) end
-- end
--
-- if not md5.dec then
-- local pattern_dec = Cs( ( P(1) / function(chr) return format("%02i",byte(chr)) end)^0 )
-- function md5.dec(str) return lpegmatch(pattern_dec,md5.sum(str)) end
-- end
function file.needsupdating(oldname,newname,threshold) -- size modification access change
local oldtime = lfs.attributes(oldname,"modification")
if oldtime then
local newtime = lfs.attributes(newname,"modification")
if not newtime then
return true -- no new file, so no updating needed
elseif newtime >= oldtime then
return false -- new file definitely needs updating
elseif oldtime - newtime < (threshold or 1) then
return false -- new file is probably still okay
else
return true -- new file has to be updated
end
else
return false -- no old file, so no updating needed
end
end
file.needs_updating = file.needsupdating
function file.syncmtimes(oldname,newname)
local oldtime = lfs.attributes(oldname,"modification")
if oldtime and lfs.isfile(newname) then
lfs.touch(newname,oldtime,oldtime)
end
end
function file.checksum(name)
if md5 then
local data = io.loaddata(name)
if data then
return md5.HEX(data)
end
end
return nil
end
function file.loadchecksum(name)
if md5 then
local data = io.loaddata(name .. ".md5")
return data and (gsub(data,"%s",""))
end
return nil
end
function file.savechecksum(name,checksum)
if not checksum then checksum = file.checksum(name) end
if checksum then
io.savedata(name .. ".md5",checksum)
return checksum
end
return nil
end
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