#!/usr/bin/env python3
# BlueKitchen GmbH (c) 2017

# primitive dump for .tlv format

import sys


def read_net_32(f):
    a = f.read(1)
    if not a:
        return -1
    b = f.read(1)
    if not b:
        return -1
    c = f.read(1)
    if not c:
        return -1
    d = f.read(1)
    if not d:
        return -1
    return ord(a) << 24 | ord(b) << 16 | ord(c) << 8 | ord(d)

def format_tag(tag):
    return ''.join([ '%c' % i if (i > 0x20 and i < 128) else '.'  for i in tag])

def as_hex(data):
    str_list = []
    for byte in data:
        str_list.append("{0:02x} ".format(byte))
    return ''.join(str_list)


if len(sys.argv) == 1:
    print('Dump TLV file')
    print('Copyright 2017, BlueKitchen GmbH')
    print('')
    print('Usage: ', sys.argv[0], 'file.tlv')
    exit(0)

infile = sys.argv[1]

with open(infile, 'rb') as fin:
    pos = 0
    # check header
    magic_0 = read_net_32(fin)
    magic_1 = read_net_32(fin)
    if magic_0 != 0x42547374 or magic_1 != 0x61636b00:
        print("%x" % magic_0)
        print("%x" % magic_1)
        print("Not a valid BTstack .tlv file\n")
        exit(0)
    pos += 8
    print("Valid .tlv file")
    while True:
        tag = fin.read(4)
        if not tag:
            break
        pos += 4
        len = read_net_32(fin)
        pos += 4
        packet = fin.read(len)
        pos += len
        print("'%s' (%s): %s" % (format_tag(tag), as_hex(tag)[0:11], as_hex(packet)))
    print("Done")