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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()