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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 xstruct

HEADER = """little:
    char[5] tag  /* 'TMPFS' */
"""

DENTRY_NONE = """little:
    uint8_t kind        /* NONE */
    uint32_t fname_len  /* 0 */
"""

DENTRY_FILE = """little:
    uint8_t kind        /* FILE */
    uint32_t fname_len  /* filename length */
    char[%d] fname      /* filename */
    uint32_t flen       /* file length */
"""

DENTRY_DIRECTORY = """little:
    uint8_t kind        /* DIRECTORY */
    uint32_t fname_len  /* filename length */
    char[%d] fname      /* filename */
"""

TMPFS_NONE = 0
TMPFS_FILE = 1
TMPFS_DIRECTORY = 2

def usage(prname):
    "Print usage syntax"
    print prname + " <PATH> <IMAGE>"

def recursion(root, outf):
    "Recursive directory walk"
    
    for name in os.listdir(root):
        canon = os.path.join(root, name)
        
        if (os.path.isfile(canon)):
            size = os.path.getsize(canon)
            
            dentry = xstruct.create(DENTRY_FILE % len(name))
            dentry.kind = TMPFS_FILE
            dentry.fname_len = len(name)
            dentry.fname = name
            dentry.flen = size
            
            outf.write(dentry.pack())
            
            inf = file(canon, "r")
            rd = 0;
            while (rd < size):
                data = inf.read(4096);
                outf.write(data)
                rd += len(data)
            inf.close()
        
        if (os.path.isdir(canon)):
            dentry = xstruct.create(DENTRY_DIRECTORY % len(name))
            dentry.kind = TMPFS_DIRECTORY
            dentry.fname_len = len(name)
            dentry.fname = name
            
            outf.write(dentry.pack())
            
            recursion(canon, outf)
            
            dentry = xstruct.create(DENTRY_NONE)
            dentry.kind = TMPFS_NONE
            dentry.fname_len = 0
            
            outf.write(dentry.pack())

def main():
    if (len(sys.argv) < 3):
        usage(sys.argv[0])
        return
    
    path = os.path.abspath(sys.argv[1])
    if (not os.path.isdir(path)):
        print "<PATH> must be a directory"
        return
    
    outf = file(sys.argv[2], "w")
    
    header = xstruct.create(HEADER)
    header.tag = "TMPFS"
    
    outf.write(header.pack())
    
    recursion(path, outf)
    
    dentry = xstruct.create(DENTRY_NONE)
    dentry.kind = TMPFS_NONE
    dentry.fname_len = 0
    
    outf.write(dentry.pack())
    
    outf.close()
    
if __name__ == '__main__':
    main()