#!/usr/bin/env python3

# Copyright (c) 2015 Andrew Fernandes <andrew@fernandes.org>
# All rights reserved.
#
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# with or without modification, are permitted provided
# that the following conditions are met:
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#   the above copyright notice, this list of conditions
#   and the following disclaimer.
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#   the above copyright notice, this list of conditions
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#   or promote products derived from this software
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"""Summarize the information in a hex file by printing the execution
        start address (if any), and the address ranges covered by the
        data (if any), in YAML format.
"""

VERSION = '2.3.0'

USAGE = '''hexinfo: summarize a hex file's contents.
Usage:
    python hexinfo.py [options] FILE [ FILE ... ]

Options:
    -h, --help              this help message.
    -v, --version           version info.
'''

import sys

INDENT = '  '
INLIST = '- '

def summarize_yaml(fname):
    print("{:s}file: '{:s}'".format(INLIST, fname))
    from intelhex import IntelHex
    ih = IntelHex(fname)
    if ih.start_addr:
        keys = sorted(ih.start_addr.keys())
        if keys == ['CS','IP']:
            entry = ih.start_addr['CS'] * 65536 + ih.start_addr['IP']
        elif keys == ['EIP']:
            entry = ih.start_addr['EIP']
        else:
            raise RuntimeError("unknown 'IntelHex.start_addr' found")
        print("{:s}entry: 0x{:08X}".format(INDENT, entry))
    segments = ih.segments()
    if segments:
        print("{:s}data:".format(INDENT))
        for s in segments:
            print("{:s}{:s}{{ first: 0x{:08X}, last: 0x{:08X}, length: 0x{:08X} }}".format(INDENT, INLIST, s[0], s[1]-1, s[1]-s[0]))
    print("")

def main(argv=None):
    import getopt

    if argv is None:
        argv = sys.argv[1:]
    try:
        opts, args = getopt.gnu_getopt(argv, 'hv', ['help', 'version'])

        for o,a in opts:
            if o in ('-h', '--help'):
                print(USAGE)
                return 0
            elif o in ('-v', '--version'):
                print(VERSION)
                return 0

    except getopt.GetoptError:
        e = sys.exc_info()[1]     # current exception
        sys.stderr.write(str(e)+"\n")
        sys.stderr.write(USAGE+"\n")
        return 1

    if len(args) < 1:
        sys.stderr.write("ERROR: You should specify one or more files to summarize.\n")
        sys.stderr.write(USAGE+"\n")
        return 1

    for fname in args:
        summarize_yaml(fname)

if __name__ == '__main__':
    sys.exit(main())
