50 lines
1.1 KiB
Python
Executable File
50 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python3
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import sys, os, struct
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loaderfile = sys.argv[1]
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elffile = sys.argv[2]
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outfile = sys.argv[3]
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data = open(loaderfile,"rb").read()
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hdrlen, loaderlen, elflen, arg = struct.unpack(">IIII",data[:16])
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if hdrlen < 0x10:
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print("ERROR: header length is 0x%x, expected at least 0x10"%hdrlen)
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sys.exit(1)
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loaderoff = hdrlen
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elfoff = loaderoff + loaderlen
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elfend = elfoff + elflen
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hdr = data[:hdrlen]
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loader = data[loaderoff:elfoff]
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elf = open(elffile,"rb").read()
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if elflen > 0:
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print("WARNING: loader already contains ELF, will replace")
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elflen = len(elf)
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if loaderlen < len(loader):
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print("ERROR: loader is larger than its reported length")
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sys.exit(1)
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if loaderlen > len(loader):
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print("Padding loader with 0x%x zeroes"%(loaderlen-len(loader)))
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loader += b"\0"*(loaderlen-len(loader))
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newdata = struct.pack(">IIII", hdrlen, loaderlen, elflen, 0) + hdr[16:]
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newdata += loader
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newdata += elf
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print("Header: 0x%x bytes"%(hdrlen))
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print("Loader: 0x%x bytes"%(loaderlen))
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print("ELF: 0x%x bytes"%(elflen))
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f = open(outfile,"wb")
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f.write(newdata)
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f.close()
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