#!/usr/bin/env python
#
# Copyright (c) 2008 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
"""
TMPFS creator
"""
import sys
import os
import struct
def align_up(size, alignment):
"Align upwards to a given alignment"
return (((size) + ((alignment) - 1)) & ~((alignment) - 1))
def usage(prname):
"Print usage syntax"
print prname + " <ALIGNMENT> <PATH> <IMAGE>"
def main():
if (len(sys.argv) < 4):
usage(sys.argv[0])
return
if (not sys.argv[1].isdigit()):
print "<ALIGNMENT> must be a number"
return
align = int(sys.argv[1], 0)
path = os.path.abspath(sys.argv[2])
if (not os.path.isdir(path)):
print "<PATH> must be a directory"
return
header_size = align_up(18, align)
payload_size = 0
outf = file(sys.argv[3], "w")
outf.write(struct.pack("<" + ("%d" % header_size) + "x"))
for root, dirs, files in os.walk(path):
relpath = root[len(path):len(root)]
for name in files:
canon = os.path.join(relpath, name)
outf.write(struct.pack("<BL" + ("%d" % len(canon)) + "s", 1, len(canon), canon))
payload_size += 5 + len(canon)
fn = os.path.join(root, name)
size = os.path.getsize(fn)
rd = 0;
outf.write(struct.pack("<L", size))
payload_size += 4
inf = file(fn, "r")
while (rd < size):
data = inf.read(4096);
outf.write(data)
payload_size += len(data)
rd += len(data)
inf.close()
for name in dirs:
canon = os.path.join(relpath, name)
outf.write(struct.pack("<BL" + ("%d" % len(canon)) + "s", 2, len(canon), canon))
payload_size += 5 + len(canon)
aligned_size = align_up(payload_size, align)
if (aligned_size - payload_size > 0):
outf.write(struct.pack("<" + ("%d" % (aligned_size - payload_size)) + "x"))
outf.seek(0)
outf.write(struct.pack("<4sBBLQ", "HORD", 1, 1, header_size, aligned_size))
outf.close()
if __name__ == '__main__':
main()