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3244 jermar 1
#!/usr/bin/env python
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#
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# Copyright (c) 2008 Martin Decky
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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"""
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HORD encapsulator
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"""
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import sys
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import os
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import xstruct
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HEADER = """little:
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    char[4] tag            /* 'HORD' */
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    uint8_t version        /* version */
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    uint8_t encoding       /* encoding */
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    uint32_t header_size   /* header size */
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    uint64_t payload_size  /* payload size */
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"""
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HORD_LSB = 1
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def align_up(size, alignment):
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    "Align upwards to a given alignment"
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    return (((size) + ((alignment) - 1)) & ~((alignment) - 1))
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def usage(prname):
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    "Print usage syntax"
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    print prname + " <ALIGNMENT> <FS_IMAGE> <HORD_IMAGE>"
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def main():
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    if (len(sys.argv) < 4):
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        usage(sys.argv[0])
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        return
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    if (not sys.argv[1].isdigit()):
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        print "<ALIGNMENT> must be a number"
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        return
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    align = int(sys.argv[1], 0)
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    if (align <= 0):
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        print "<ALIGNMENT> must be positive"
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        return
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    fs_image = os.path.abspath(sys.argv[2])
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    if (not os.path.isfile(fs_image)):
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        print "<FS_IMAGE> must be a file"
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        return
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    inf = file(fs_image, "rb")
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    outf = file(sys.argv[3], "wb")
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    header = xstruct.create(HEADER)
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    header_size = header.size()
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    payload_size = os.path.getsize(fs_image)
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    header_size_aligned = align_up(header_size, align)
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    payload_size_aligned = align_up(payload_size, align)
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    header.tag = "HORD"
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    header.version = 1
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    header.encoding = HORD_LSB
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    header.header_size = header_size_aligned
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    header.payload_size = payload_size_aligned
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    outf.write(header.pack())
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    outf.write(xstruct.create("little: padding[%d]" % (header_size_aligned - header_size)).pack())
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    outf.write(inf.read())
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    padding = payload_size_aligned - payload_size
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    if (padding > 0):
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        outf.write(xstruct.create("little: padding[%d]" % padding).pack())
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    inf.close()
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    outf.close()
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if __name__ == '__main__':
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    main()