mirror of
https://git.shadowkat.net/izaya/OC-PsychOS2.git
synced 2024-11-16 09:31:35 -05:00
113 lines
2.5 KiB
Lua
113 lines
2.5 KiB
Lua
local mtar = {}
|
|
|
|
-- detect OS hopefully
|
|
if _OSVERSION then
|
|
if _OSVERSION:sub(1,8) == "OpenOS" then
|
|
OPENOS = true
|
|
elseif _OSVERSION:sub(1,9) == "PsychOS" then
|
|
PSYCHOS = true
|
|
end
|
|
else
|
|
LINUX = true
|
|
end
|
|
|
|
local function mkdir(dir)
|
|
if OPENOS or LINUX then
|
|
os.execute("mkdir "..dest.."/"..dir.." &> /dev/null")
|
|
elseif PSYCHOS then
|
|
-- todo: write PsychOS support
|
|
end
|
|
end
|
|
|
|
local function toint(s)
|
|
local n = 0
|
|
local i = 1
|
|
for p in s:gmatch(".") do
|
|
n = n << 8
|
|
n = n | string.byte(p)
|
|
i=i+1
|
|
end
|
|
return n
|
|
end
|
|
|
|
local function cint(n,l)
|
|
local t={}
|
|
for i = 0, 7 do
|
|
t[i+1] = (n >> (i * 8)) & 0xFF
|
|
end
|
|
return string.reverse(string.char(table.unpack(t)):sub(1,l))
|
|
end
|
|
|
|
local function cleanPath(path)
|
|
local pt = {}
|
|
for segment in path:gmatch("[^/]+") do
|
|
if segment == ".." then
|
|
pt[#pt] = nil
|
|
elseif segment ~= "." then
|
|
pt[#pt+1] = segment
|
|
end
|
|
end
|
|
return table.concat(pt,"/")
|
|
end
|
|
|
|
function mtar.genHeader(fname,len) -- generate a header for file *fname* when provided with file length *len*
|
|
return string.format("%s%s%s",cint(fname:len(),2),fname,cint(len,2))
|
|
end
|
|
|
|
function mtar.iter(stream) -- table -- function -- Given buffer *stream*, returns an iterator suitable for use with *for* that returns, for each iteration, the file name, a function to read from the file, and the length of the file.
|
|
local remain = 0
|
|
local function read(n)
|
|
local rb = stream:read(math.min(n,remain))
|
|
remain = remain - rb:len()
|
|
return rb
|
|
end
|
|
return function()
|
|
stream:read(remain)
|
|
local nlen = toint(stream:read(2) or "\0\0")
|
|
if nlen == 0 then
|
|
return
|
|
end
|
|
local name = cleanPath(stream:read(nlen))
|
|
local fsize = toint(stream:read(2))
|
|
remain = fsize
|
|
return name, read, fsize
|
|
end
|
|
end
|
|
|
|
function mtar.unarchive(stream,dest,verbose) -- Extract mtar archive read from *stream* to *dest*. If *verbose*, print status.
|
|
dest = dest or "."
|
|
while true do
|
|
local nlen = toint(stream:read(2) or "\0\0")
|
|
if nlen == 0 then
|
|
break
|
|
end
|
|
local name = cleanPath(stream:read(nlen))
|
|
local fsize = toint(stream:read(2))
|
|
if verbose then
|
|
io.write(name.." "..tostring(fsize).."... ")
|
|
end
|
|
local dir = name:match("(.+)/.*%.?.+")
|
|
if (dir) then
|
|
mkdir(dir)
|
|
end
|
|
local f = io.open(dest.."/"..name,"wb")
|
|
local rsize,buf = fsize, ""
|
|
if f then
|
|
repeat
|
|
buf = stream:read(math.min(rsize,2048))
|
|
f:write(buf)
|
|
rsize = rsize - buf:len()
|
|
if verbose then
|
|
io.write(tostring(rsize).." ")
|
|
end
|
|
until rsize <= 1
|
|
f:close()
|
|
end
|
|
if verbose then
|
|
print("done.")
|
|
end
|
|
end
|
|
end
|
|
|
|
return mtar
|