1 files changed, 78 insertions, 0 deletions

diff --git a/XuUnp.py b/XuUnp.py
new file mode 100644
index 0000000..dc84408
--- /dev/null
+++ b/XuUnp.py
@@ -0,0 +1,78 @@
+import struct, sys, os, binascii
+
+class bitsReader(object):
+  def __init__(self, ab):
+    self.bits = int(binascii.hexlify(ab[::-1]), 16)
+    self.o = 0
+  def get(self, n=1):
+    self.bits, v = divmod(self.bits, 1<<n)
+    return v
+
+def decompress(ab):
+  cbUnp, = struct.unpack_from("<L", ab)
+  print(". Decompressing %d -> %d, be patient..." % (len(ab), cbUnp))
+  br = bitsReader(ab[4:])
+  r = bytearray()
+  while (br.bits):
+    flag = br.get(1)
+    if flag:
+      ncp = br.get(4)
+      if ncp < 3: ncp += 16
+      offs = br.get(14)
+      ocp = len(r) - offs
+      for i in range(ncp): r.append(r[ocp+i])
+    else:
+      r.append(br.get(8))
+  if len(r) != cbUnp: print("? Got %d instead of %d..." % (len(r), cbUnp))
+  else: print("+ Unpacked OK")
+  return bytes(r)
+
+class Elf64_Shdr(object):
+  fmt = struct.Struct("<LLQQQQLLQQ")
+  def __init__(self, ab, shoff, iSec):
+    self.sh_name, self.sh_type, self.sh_flags, self.sh_addr, self.sh_offset, self.sh_size, self.sh_link, self.sh_info, self.sh_addralign, self.sh_entsize = \
+      self.fmt.unpack_from(ab, shoff + iSec*self.fmt.size)
+
+def process(fn):
+  print("Processing %s" % fn)
+  with open(fn, "rb") as fi: ab = fi.read()
+  oELF = ab.find(b'\x7FELF\2\1\1\0')
+  if oELF < 0:
+    print("- Can't find top ELF")
+    return
+  print(". ELF at 0x%X" % oELF)
+  e_ident, e_type, e_machine, e_version, e_entry, e_phoff, e_shoff, e_flags, e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum, e_shstrndx = \
+    struct.unpack_from("<16sHHLQQQLHHHHHH", ab, oELF)
+  names = Elf64_Shdr(ab, oELF + e_shoff, e_shstrndx)
+  oNames = oELF + names.sh_offset
+  
+  nPARKING, nXURT = b".PARKING\0", b".XURT\0"
+  sPARKING, sXURT = None,None
+
+  for iSec in range(e_shnum):
+    sec = Elf64_Shdr(ab, oELF + e_shoff, iSec)
+    oN = oNames+sec.sh_name
+    if ab[oN:oN+len(nPARKING)] == nPARKING: sPARKING = sec
+    if ab[oN:oN+len(nXURT)] == nXURT: sXURT = sec
+
+  base,ext = os.path.splitext(fn)
+  if not os.path.isdir(base): os.mkdir(base)
+  with open(os.path.join(base, "topELF.bin"), "wb") as fo: fo.write(ab[oELF:])
+  
+  if sPARKING: 
+    print(". Parking: 0x%X+%X" % (oELF+sPARKING.sh_offset, sPARKING.sh_size))
+    with open(os.path.join(base, "Parking.bin"), "wb") as fo: fo.write(ab[oELF+sPARKING.sh_offset:oELF+sPARKING.sh_offset+sPARKING.sh_size])
+  else: print("- Can't find .PARKING")
+
+  if sXURT: 
+    print(". XuRT: 0x%X+%X" % (oELF+sXURT.sh_offset, sXURT.sh_size))
+    packed = ab[oELF+sXURT.sh_offset:oELF+sXURT.sh_offset+sXURT.sh_size]
+#    with open(os.path.join(base, "XuRT.sect"), "wb") as fo: fo.write(packed)
+    plain = decompress(packed)
+    with open(os.path.join(base, "XuRT.bin"), "wb") as fo: fo.write(plain)
+  else: print("- Can't find .XURT")
+
+def main(argv):
+  for fn in argv[1:]: process(fn)
+
+if __name__=="__main__": main(sys.argv)