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#!/usr/bin/env python
#
# Copyright (c) 2017, Linaro Limited
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. 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.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
#

import argparse
import array
import os
import re
import uuid
import zlib

def get_args():

	parser = argparse.ArgumentParser(description='Converts a Trusted '
		'Application ELF file into a C source file, ready for '
		'inclusion in the TEE binary as an "early TA".')

	parser.add_argument('--out', required=True,
		help='Name of the output C file')

	parser.add_argument('--ta', required=True,
		help='Path to the TA binary. File name has to be: <uuid>.* '
		'such as: 8aaaf200-2450-11e4-abe2-0002a5d5c51b.stripped.elf')

	parser.add_argument('--compress', dest="compress",
		action="store_true", help='Compress the TA using the DEFLATE '
		'algorithm')

	return parser.parse_args()

def main():

	args = get_args();

	ta_uuid = uuid.UUID(re.sub('\..*', '', os.path.basename(args.ta)))

	with open(args.ta, 'rb') as ta:
		bytes = ta.read()
		uncompressed_size = len(bytes)
		if args.compress:
			bytes = zlib.compress(bytes)
		size = len(bytes)

	f = open(args.out, 'w')
	f.write('/* Generated from ' + args.ta + ' by ' +
		os.path.basename(__file__) + ' */\n\n')
	f.write('#include <compiler.h>\n');
        f.write('#include <kernel/early_ta.h>\n\n');
	f.write('__extension__ const struct early_ta __early_ta_' +
		ta_uuid.hex +
		'\n__early_ta __aligned(__alignof__(struct early_ta)) = {\n')
	f.write('\t.uuid = {\n')
	f.write('\t\t.timeLow = 0x{:08x},\n'.format(ta_uuid.time_low))
	f.write('\t\t.timeMid = 0x{:04x},\n'.format(ta_uuid.time_mid))
	f.write('\t\t.timeHiAndVersion = ' +
		'0x{:04x},\n'.format(ta_uuid.time_hi_version))
	f.write('\t\t.clockSeqAndNode = {\n')
	csn = '{0:02x}{1:02x}{2:012x}'.format(ta_uuid.clock_seq_hi_variant,
		ta_uuid.clock_seq_low, ta_uuid.node)
	f.write('\t\t\t')
	f.write(', '.join('0x' + csn[i:i+2] for i in range(0, len(csn), 2)))
	f.write('\n\t\t},\n\t},\n')
	f.write('\t.size = {:d},\n'.format(size))
	if args.compress:
		f.write('\t.uncompressed_size = '
			'{:d},\n'.format(uncompressed_size))
	f.write('\t.ta = {\n')
	i = 0
	while i < size:
		if i % 8 == 0:
			f.write('\t\t');
		f.write('0x' + '{:02x}'.format(ord(bytes[i])) + ',')
		i = i + 1
		if i % 8 == 0 or i == size:
			f.write('\n')
		else:
			f.write(' ')
	f.write('\t},\n')
	f.write('};\n');
	f.close()

if __name__ == "__main__":
	main()