From f92cbde89b0bacc5d8efeb091d7003fed815319c Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Mon, 22 Jul 2019 09:45:40 +1000
Subject: [PATCH] added a new simpler tape loader and an archiving program for
 it

---
 tapeloader/mkarchive.lua  | 24 ++++++++++++++++
 tapeloader/tapeloader.lua | 58 +++++++++++++++++++++++++++++++++++++++
 tapeloader/unarchive.lua  | 29 ++++++++++++++++++++
 3 files changed, 111 insertions(+)
 create mode 100644 tapeloader/mkarchive.lua
 create mode 100644 tapeloader/tapeloader.lua
 create mode 100644 tapeloader/unarchive.lua

diff --git a/tapeloader/mkarchive.lua b/tapeloader/mkarchive.lua
new file mode 100644
index 0000000..cf5c301
--- /dev/null
+++ b/tapeloader/mkarchive.lua
@@ -0,0 +1,24 @@
+local tArgs = {...}
+
+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 genHeader(fname,len)
+ return string.format("%s%s%s",cint(fname:len(),2),fname,cint(len,2))
+end
+
+for k,v in ipairs(tArgs) do
+ local f = io.open(v,"rb")
+ if f then
+  local content = f:read("*a")
+  f:close()
+  io.write(genHeader(v,content:len()))
+  io.write(content)
+ end
+end
+io.write(string.char(0):rep(2))
diff --git a/tapeloader/tapeloader.lua b/tapeloader/tapeloader.lua
new file mode 100644
index 0000000..07a32fd
--- /dev/null
+++ b/tapeloader/tapeloader.lua
@@ -0,0 +1,58 @@
+local fs = component.proxy(computer.tmpAddress())
+local init = function() end
+if fs.exists("/init.lua") then
+do
+local tape = component.proxy(component.list("tape_drive")())
+
+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 function fwrite(name,len)
+ local dir = name:match("(.+)/.*%.?.+")
+ if (dir) then
+  fs.makeDirectory("/"..dir)
+ end
+ local fh = fs.open(name, "w")
+ fs.write(fh,tape.read(len))
+ fs.close(fh)
+end
+
+tape.seek(-math.huge)
+
+while true do
+ local nlen = toint(tape.read(2))
+ if nlen == 0 then
+  break
+ end
+ local name = tape.read(nlen)
+ local fsize = toint(tape.read(2))
+ fwrite(name,fsize)
+ computer.beep()
+end
+end
+end
+do
+local f=fs.open("/init.lua","rb")
+if not f then error("no init.lua") end
+local initstr = ""
+local data = ""
+repeat
+ initstr = initstr .. data
+ data = fs.read(f,2048)
+until data == nil
+init = load(initstr)
+end
+computer.getBootAddress = computer.tmpAddress
+init()
diff --git a/tapeloader/unarchive.lua b/tapeloader/unarchive.lua
new file mode 100644
index 0000000..47a4d64
--- /dev/null
+++ b/tapeloader/unarchive.lua
@@ -0,0 +1,29 @@
+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))
+ local fcontent = fi:read(fsize)
+ print(name,fsize)
+end
+fi:close()