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|
if not modules then modules = { } end modules ['util-tar'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local type, tonumber = type, tonumber
local gsub, escapedpattern = string.gsub, string.escapedpattern
local nameonly, dirname, makedirs = file.nameonly, file.dirname, dir.makedirs
local savedata = io.savedata
local newreader = io.newreader
local report = logs.reporter("tar")
local types = {
["0"] = "file",
["\0"] = "regular",
["1"] = "link",
["2"] = "symbolic", -- reserved
["3"] = "character",
["4"] = "block",
["5"] = "directory",
["6"] = "fifo",
["7"] = "continuation", -- reserved
["x"] = "extended", -- header
}
local function asstring(str)
return str and gsub(str,"[\0 ]+$","") or nil
end
local function asnumber(str)
str = gsub(str,"\0$","")
return tonumber(str,8)
end
local function opentar(whatever,filename)
local f = newreader(filename,whatever)
if f then
f.metadata = {
nofpaths = 0,
noffiles = 0,
noflinks = 0,
nofbytes = 0,
}
return f
end
end
local function readheader(t)
-- checksum
local p = t:getposition()
local h = t:readbytetable(512)
t:setposition(p)
for i=149,156 do -- nasty, one less
h[i] = 0
end
local c = 256
for i=1,512 do
c = c + h[i]
end
--
local header = {
name = asstring(t:readstring(100)), -- 0
mode = asnumber(t:readstring( 8)), -- 100 -- when we write: 0775 octal
uid = asnumber(t:readstring( 8)), -- 108
gid = asnumber(t:readstring( 8)), -- 116
size = asnumber(t:readstring( 12)), -- 124
mtime = asnumber(t:readstring( 12)), -- 136
checksum = asnumber(t:readstring( 6)), -- 148 -- actually 6 with space and \0
dummy = t:skip (2) ,
typeflag = t:readstring( 1) , -- 156
linkname = asstring(t:readstring(100)), -- 157
-- magic = asstring(t:readstring( 6)), -- 257 -- ustar\0
-- version = 2 -- 263
-- uname = 32 -- 265
-- gname = 32 -- 297
-- devmajor = 8 -- 329
-- devminor = 8 -- 337
-- prefix = 155 -- 345
padding = t:skip (255) , -- 500
}
local typeflag = header.typeflag
if typeflag then
header.filetype = types[typeflag]
if c == header.checksum then
return header
end
end
end
local readers = {
directory = function(t,h)
local metadata = t.metadata
local filename = h.name
if metadata.verbose then
report("%8s %s","",filename)
end
metadata.nofpaths = metadata.nofpaths + 1
return true
end,
file = function(t,h)
local metadata = t.metadata
local filename = h.name
local filesize = h.size
local pathname = dirname(filename)
if metadata.verbose then
report("% 8i : %s",filesize,filename)
end
if makedirs(pathname) then
savedata(filename,t:readstring(filesize))
else
t.skip(filesize)
end
local position = t:getposition()
local target = position + (512 - position % 512) % 512
t:setposition(target)
metadata.noffiles = metadata.noffiles + 1
metadata.nofbytes = metadata.nofbytes + filesize
return true
end,
symbolic = function(t,h)
local metadata = t.metadata
local filename = h.name
local linkname = h.linkname
if metadata.verbose then
report("%8s %s => %s","",linkname,filename)
end
metadata.noflinks = metadata.noflinks + 1
return true
end,
}
local skippers = {
directory = function(t,h)
return true
end,
file = function(t,h)
local filesize = h.size
local fileoffset = t:getposition()
local position = filesize + fileoffset
local target = position + (512 - position % 512) % 512
t:setposition(target)
return fileoffset
end,
symbolic = function(t,h)
return true
end,
}
local writers = {
-- nothing here (yet)
}
local function saveheader(t,h)
local filetype = h.filetype
local reader = readers[filetype]
if reader then
return filetype, reader(t,h)
else
report("no reader for %s",filetype)
end
end
local function skipheader(t,h)
local filetype = h.filetype
local skipper = skippers[filetype]
if skipper then
return filetype, skipper(t,h)
else
report("no skipper for %s",filetype)
end
end
local function unpacktar(whatever,filename,verbose)
local t = opentar(whatever,filename)
if t then
local metadata = t.metadata
statistics.starttiming(metadata)
if verbose then
if whatever == "string" then
report("unpacking: %i bytes",#filename)
else
report("unpacking: %s",filename)
end
report("")
metadata.verbose = verbose
end
while true do
local h = readheader(t)
if not h then
break
else
local filetype, saved = saveheader(t,h)
if not saved then
break
end
end
end
statistics.stoptiming(metadata)
metadata.runtime = statistics.elapsed(metadata)
if verbose then
report("")
report("number of paths : %i",metadata.nofpaths)
report("number of files : %i",metadata.noffiles)
report("number of links : %i",metadata.noflinks)
report("number of bytes : %i",metadata.nofbytes)
report("")
report("runtime needed : %s",statistics.elapsedseconds(metadata))
report("")
end
t.close()
return metadata
end
end
local function listtar(whatever,filename,onlyfiles)
local t = opentar(whatever,filename)
if t then
local list, n = { }, 0
while true do
local h = readheader(t)
if not h then
break
else
local filetype, offset = skipheader(t,h)
if not offset then
break
elseif filetype == "file" then
n = n + 1 ; list[n] = { filetype, h.name, h.size }
elseif filetype == "link" then
n = n + 1 ; list[n] = { filetype, h.name, h.linkfile }
elseif not onlyfiles then
n = n + 1 ; list[n] = { filetype, h.name }
end
end
end
t.close()
-- can be an option
table.sort(list,function(a,b) return a[2] < b[2] end)
return list
end
end
local function hashtar(whatever,filename,strip)
local t = opentar(whatever,filename)
if t then
local list = { }
if strip then
strip = "^" .. escapedpattern(nameonly(nameonly(strip))) .. "/"
end
while true do
local h = readheader(t)
if not h then
break
else
local filetype, offset = skipheader(t,h)
if not offset then
break
else
local name = h.name
if strip then
name = gsub(name,strip,"")
end
if filetype == "file" then
list[name] = { offset, h.size }
elseif filetype == "link" then
list[name] = h.linkname
end
end
end
end
t.close()
return list
end
end
-- weak table ?
local function fetchtar(whatever,archive,filename,list)
if not list then
list = hashtar(whatever,archive)
end
if list then
local what = list[filename]
if type(what) == "string" then
what = list[what] -- a link
end
if what then
local t = opentar(whatever,archive)
if t then
t:setposition(what[1])
return t:readstring(what[2])
end
end
end
end
local function packtar(whatever,filename,verbose)
report("packing will be implemented when we need it")
end
local tar = {
files = {
unpack = function(...) return unpacktar("file", ...) end,
pack = function(...) return packtar ("file", ...) end,
list = function(...) return listtar ("file", ...) end,
hash = function(...) return hashtar ("file", ...) end,
fetch = function(...) return fetchtar ("file", ...) end,
},
strings = {
unpack = function(...) return unpacktar("string",...) end,
pack = function(...) return packtar ("string",...) end,
list = function(...) return listtar ("string",...) end,
hash = function(...) return hashtar ("string",...) end,
fetch = function(...) return fetchtar ("string",...) end,
},
streams = {
unpack = function(...) return unpacktar("stream",...) end,
pack = function(...) return packtar ("stream",...) end,
list = function(...) return listtar ("stream",...) end,
hash = function(...) return hashtar ("stream",...) end,
fetch = function(...) return fetchtar ("stream",...) end,
},
}
utilities.tar = tar
-- tar.files .unpack("e:/luatex/luametatex-source.tar",true)
-- tar.streams.unpack("e:/luatex/luametatex-source.tar",true)
-- tar.strings.unpack(io.loaddata("e:/luatex/luametatex-source.tar"),true)
-- inspect(tar.files .unpack("e:/luatex/luametatex-source.tar"))
-- inspect(tar.streams.unpack("e:/luatex/luametatex-source.tar"))
-- inspect(tar.strings.unpack(io.loaddata("e:/luatex/luametatex-source.tar")))
-- inspect(tar.files .list("e:/luatex/luametatex-source.tar",true))
-- inspect(tar.streams.list("e:/luatex/luametatex-source.tar",true))
-- inspect(tar.strings.list(io.loaddata("e:/luatex/luametatex-source.tar"),true))
-- local c = os.clock()
-- local l = tar.files.hash("e:/luatex/luametatex-source.tar")
-- for i=1,500 do
-- local s = tar.files.fetch("e:/luatex/luametatex-source.tar", "luametatex-source/source/tex/texbuildpage.c", l)
-- local s = tar.files.fetch( "e:/luatex/luametatex-source.tar","luametatex-source/source/lua/lmtlibrary.c", l)
-- end
-- print(os.clock()-c)
return tar
|