34,10 → 34,6 |
import os |
import struct |
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def align_up(size, alignment): |
"Align upwards to a given alignment" |
return (((size) + ((alignment) - 1)) & ~((alignment) - 1)) |
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def usage(prname): |
"Print usage syntax" |
print prname + " <ALIGNMENT> <PATH> <IMAGE>" |
76,39 → 72,21 |
return payload_size |
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def main(): |
if (len(sys.argv) < 4): |
if (len(sys.argv) < 3): |
usage(sys.argv[0]) |
return |
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if (not sys.argv[1].isdigit()): |
print "<ALIGNMENT> must be a number" |
return |
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align = int(sys.argv[1], 0) |
path = os.path.abspath(sys.argv[2]) |
path = os.path.abspath(sys.argv[1]) |
if (not os.path.isdir(path)): |
print "<PATH> must be a directory" |
return |
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header_size = align_up(18, align) |
outf = file(sys.argv[3], "w") |
outf.write(struct.pack("<" + ("%d" % header_size) + "x")) |
outf = file(sys.argv[2], "w") |
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outf.write(struct.pack("<5s", "TMPFS")) |
payload_size = 5 |
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payload_size += recursion(path, outf) |
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recursion(path, outf) |
outf.write(struct.pack("<BL", 0, 0)) |
payload_size += 5 |
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aligned_size = align_up(payload_size, align) |
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if (aligned_size - payload_size > 0): |
outf.write(struct.pack("<" + ("%d" % (aligned_size - payload_size)) + "x")) |
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outf.seek(0) |
outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size)) |
outf.close() |
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if __name__ == '__main__': |