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#!/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 recursion(root, outf):

    "Recursive directory walk"

    payload_size = 0

    for name in os.listdir(root):

        canon = os.path.join(root, name)

        if (os.path.isfile(canon)):

            outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 1, len(name), name))

            payload_size += 5 + len(name)

            size = os.path.getsize(canon)

            rd = 0;

            outf.write(struct.pack("<L", size))

            payload_size += 4

            inf = file(canon, "r")

            while (rd < size):

                data = inf.read(4096);

                outf.write(data)

                payload_size += len(data)

                rd += len(data)

            inf.close()

        if (os.path.isdir(canon)):

            outf.write(struct.pack("<BL" + ("%d" % len(name)) + "s", 2, len(name), name))

            payload_size += 5 + len(name)

            payload_size += recursion(canon, outf)

            outf.write(struct.pack("<BL", 0, 0))

            payload_size += 5

    return payload_size

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)

    outf = file(sys.argv[3], "w")

    outf.write(struct.pack("<" + ("%d" % header_size) + "x"))

    outf.write(struct.pack("<5s", "TMPFS"))

    payload_size = 5

    payload_size += recursion(path, outf)

    outf.write(struct.pack("<BL", 0, 0))

    payload_size += 5

    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()