added an mtar utility for OpenOS

This commit is contained in:
Izaya 2020-03-06 22:10:16 +11:00
parent 7e41ce6ee2
commit 9e7d778e21
3 changed files with 170 additions and 11 deletions

View File

@ -0,0 +1,126 @@
local shell = require "shell"
local mtar = require "libmtar"
local args, opts = shell.parse(...)
local w, lz16 = pcall(require, "liblz16")
if not w then lz16 = nil end
local function toint(s)
s = s or "\0"
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 vw(s)
if opts.v and s then
io.write(tostring(s))
end
end
local function vp(...)
for k,v in ipairs({...}) do
vw(tostring(v).."\n")
end
end
if opts.x then
local f
if opts.z then
f = lz16.open(args[1],"rb")
else
f = io.open(args[1],"rb")
end
if not f then error("unable to open file") end
local w, r = mtar.unarchive(f,args[2] or ".",opts.v)
f:close()
elseif opts.t then
local f
if opts.z then
f = lz16.open(args[1],"rb")
else
f = io.open(args[1],"rb")
end
if not f then error("unable to open file") end
while true do
local nlen = toint(f:read(2))
if nlen == 0 then
break
end
local name = f:read(nlen)
local fsize = toint(f:read(2) or "\0\0")
f:read(fsize)
print(name..": "..tostring(fsize))
end
f:close()
elseif opts.c then
local mode = (opts.r and "ab") or "wb"
local f
if opts.z then
f = lz16.open(args[1],mode)
else
f = io.open(args[1],mode)
end
if not f then error("unable to open file") end
table.remove(args,1)
local fs = require "filesystem"
for k,v in pairs(args) do
local ap = true
if v:sub(1,1) ~= "/" then
ap = false
v = os.getenv("PWD") .. "/" .. v
end
v=fs.canonical(v)
vw(v.."... ")
if fs.isDirectory(v) then
vp("directory.")
for file in fs.list(v) do
if ap then
args[#args+1] = v.."/"..file
else
args[#args+1] = v:sub(os.getenv("PWD"):len()+2).."/"..file
end
end
else
local fsize = fs.size(v)
local inputf = io.open(v,"rb")
if fsize and inputf then
local c = 0
if ap then
f:write(mtar.genHeader(v,fsize))
else
f:write(mtar.genHeader(v:sub(os.getenv("PWD"):len()+2),fsize))
end
while true do
local ib = inputf:read(4096)
if ib then
c=c+ib:len()
f:write(ib)
else
break
end
end
vp(c)
else
vp("failed to open.")
end
end
end
f:close()
else
print([[Usage:
mtar -[crtxvz] <archivefile> [otherfile] [otherfile]
Operations:
x: extract archive
c: create archive
t: list contents of archive
Flags:
v: be verbose
z: use LZSS compression (requires liblz16)]])
end

30
mtar/OpenOS/usr/man/mtar Normal file
View File

@ -0,0 +1,30 @@
# mtar - Minitel Archiver
## Usage
mtar -[crtxvz] <archivefile> [otherfile] [otherfile]
## Operations
x: extract archive
c: create archive
t: list contents of archive
## Flags
v: be verbose
z: use LZSS compression (requires liblz16)]])
## Examples
Extract archive *example.mtar*
mtar -x example.mtar
Show the files in compressed archive *example.mtar.lss*
mtar -tz example.mtar.lss
Create a compressed archive *example.mtar.lss* from file *fun* and folder *junk*
mtar -cz example.mtar.lss fun junk/

View File

@ -20,15 +20,11 @@ local function mkdir(dir)
end
local function toint(s)
s=s or ""
local n = 0
local i = 1
while true do
local p = s:sub(i,i)
if p == "" then break end
local b = string.byte(p)
for p in s:gmatch(".") do
n = n << 8
n = n | b
n = n | string.byte(p)
i=i+1
end
return n
@ -58,17 +54,18 @@ function mtar.genHeader(fname,len) -- generate a header for file *fname* when pr
return string.format("%s%s%s",cint(fname:len(),2),fname,cint(len,2))
end
function mtar.unarchive(stream,dest)
function mtar.unarchive(stream,dest,verbose) -- Extract mtar archive read from *stream* to *dest*. If *verbose*, print status.
dest = dest or "."
mkdir(dest)
while true do
local nlen = toint(stream:read(2))
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))
print(name,fsize)
if verbose then
io.write(name.." "..tostring(fsize).."... ")
end
local dir = name:match("(.+)/.*%.?.+")
if (dir) then
mkdir(dir)
@ -77,12 +74,18 @@ function mtar.unarchive(stream,dest)
local rsize,buf = fsize, ""
if f then
repeat
buf = stream:read(math.min(rsize,1024))
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