mini/makebin.py

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#!/bin/env python
import sys, os, struct, sha
loaderfile = sys.argv[1]
elffile = sys.argv[2]
outfile = sys.argv[3]
data = open(loaderfile,"rb").read()
hdrlen, loaderlen, elflen, arg = struct.unpack(">IIII",data[:16])
if hdrlen < 0x10:
print "ERROR: header length is 0x%x, expected at least 0x10"%hdrlen
sys.exit(1)
loaderoff = hdrlen
elfoff = loaderoff + loaderlen
elfend = elfoff + elflen
hdr = data[:hdrlen]
loader = data[loaderoff:elfoff]
elf = open(elffile,"rb").read()
if elflen > 0:
print "WARNING: loader already contains ELF, will replace"
elflen = len(elf)
if loaderlen < len(loader):
print "ERROR: loader is larger than its reported length"
sys.exit(1)
if loaderlen > len(loader):
print "Padding loader with 0x%x zeroes"%(loaderlen-len(loader))
loader += "\x00"*(loaderlen-len(loader))
newdata = struct.pack(">IIII", hdrlen, loaderlen, elflen, 0) + hdr[16:]
newdata += loader
newdata += elf
print "Header: 0x%x bytes"%(hdrlen)
print "Loader: 0x%x bytes"%(loaderlen)
print "ELF: 0x%x bytes"%(elflen)
f = open(outfile,"wb")
f.write(newdata)
f.close()