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#!/usr/bin/env python
#
# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Fingerprints the V8 snapshot blob files.
Constructs a SHA256 fingerprint of the V8 natives and snapshot blob files and
creates a .cc file which includes these fingerprint as variables.
"""
import hashlib
import optparse
import os
import sys
_HEADER = """// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file was generated by fingerprint_v8_snapshot.py.
namespace gin {
"""
_FOOTER = """
} // namespace gin
"""
def FingerprintFile(file_path):
input_file = open(file_path, 'rb')
sha256 = hashlib.sha256()
while True:
block = input_file.read(sha256.block_size)
if not block:
break
sha256.update(block)
return sha256.digest()
def WriteFingerprint(output_file, variable_name, fingerprint):
output_file.write('\nextern const unsigned char %s[] = { ' % variable_name)
for byte in fingerprint:
output_file.write(str(ord(byte)) + ', ')
output_file.write('};\n')
def WriteOutputFile(natives_fingerprint,
snapshot_fingerprint,
output_file_path):
output_dir_path = os.path.dirname(output_file_path)
if not os.path.exists(output_dir_path):
os.makedirs(output_dir_path)
output_file = open(output_file_path, 'w')
output_file.write(_HEADER)
WriteFingerprint(output_file, 'g_natives_fingerprint', natives_fingerprint)
output_file.write('\n')
WriteFingerprint(output_file, 'g_snapshot_fingerprint', snapshot_fingerprint)
output_file.write(_FOOTER)
def main():
parser = optparse.OptionParser()
parser.add_option('--snapshot_file',
help='The input V8 snapshot blob file path.')
parser.add_option('--natives_file',
help='The input V8 natives blob file path.')
parser.add_option('--output_file',
help='The path for the output cc file which will be write.')
options, _ = parser.parse_args()
natives_fingerprint = FingerprintFile(options.natives_file)
snapshot_fingerprint = FingerprintFile(options.snapshot_file)
WriteOutputFile(
natives_fingerprint, snapshot_fingerprint, options.output_file)
return 0
if __name__ == '__main__':
sys.exit(main())
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