From eaef339fe93b54795aa07af7070fa406e5cc4758 Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Mon, 22 Jul 2019 13:47:21 +1000
Subject: [PATCH] added an unarchiving program, changed mkarchive behavior
 slightly

---
 exec/mkarchive.lua |  4 ++--
 exec/unarchive.lua | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 2 deletions(-)
 create mode 100644 exec/unarchive.lua

diff --git a/exec/mkarchive.lua b/exec/mkarchive.lua
index bad1a2e..ce860a5 100644
--- a/exec/mkarchive.lua
+++ b/exec/mkarchive.lua
@@ -1,7 +1,7 @@
 local tArgs = {...}
-local output = tArgs[2]
+local output = table.remove(tArgs,#tArgs)
 local of = io.open(output,"wb")
-local files, dirs = {}, {tArgs[1]}
+local files, dirs = {}, {tArgs[1] or "."}
 
 local function cint(n,l)
  local t={}
diff --git a/exec/unarchive.lua b/exec/unarchive.lua
new file mode 100644
index 0000000..13d4296
--- /dev/null
+++ b/exec/unarchive.lua
@@ -0,0 +1,51 @@
+local tArgs = {...}
+
+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)
+  n = n << 8
+  n = n | b
+  i=i+1
+ end
+ return n
+end
+
+local fi = io.open(tArgs[1])
+while true do
+ local nlen = toint(fi:read(2))
+ if nlen == 0 then
+  break
+ end
+ local name = fi:read(nlen)
+ local fsize = toint(fi:read(2))
+ io.write(string.format("%s: %d... ",name,fsize))
+ if not tArgs[2] then
+  local dir = name:match("(.+)/.*%.?.+")
+  if (dir) then
+   fs.makeDirectory(dir)
+  end
+  local f = io.open(name,"wb")
+  local rsize,buf = fsize, ""
+  if f then
+   repeat
+    buf = fi:read(math.min(rsize,1024))
+    f:write(buf)
+    rsize = rsize - buf:len()
+   until rsize <= 1
+   f:close()
+  end
+ else
+  local rsize = fsize
+  repeat
+   buf = fi:read(math.min(rsize,1024))
+   rsize = rsize - buf:len()
+  until rsize <= 1
+ end
+ print(fsize)
+end
+fi:close()