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author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /macros/luatex/generic/lualibs/lualibs-md5.lua |
Initial commit
Diffstat (limited to 'macros/luatex/generic/lualibs/lualibs-md5.lua')
-rw-r--r-- | macros/luatex/generic/lualibs/lualibs-md5.lua | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/macros/luatex/generic/lualibs/lualibs-md5.lua b/macros/luatex/generic/lualibs/lualibs-md5.lua new file mode 100644 index 0000000000..6758fa4444 --- /dev/null +++ b/macros/luatex/generic/lualibs/lualibs-md5.lua @@ -0,0 +1,110 @@ +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 = string.gsub + +-- local gsub, format, byte = string.gsub, string.format, string.byte +-- +-- 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 + +do + + local patterns = lpeg and lpeg.patterns + + if patterns then + + local bytestoHEX = patterns.bytestoHEX + local bytestohex = patterns.bytestohex + local bytestodec = patterns.bytestodec + + local lpegmatch = lpeg.match + local md5sum = md5.sum + + if not md5.HEX then function md5.HEX(str) if str then return lpegmatch(bytestoHEX,md5sum(str)) end end end + if not md5.hex then function md5.hex(str) if str then return lpegmatch(bytestohex,md5sum(str)) end end end + if not md5.dec then function md5.dec(str) if str then return lpegmatch(bytestodec,md5sum(str)) end end end + + md5.sumhexa = md5.hex + md5.sumHEXA = md5.HEX + + 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 |