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| 1 #!/usr/bin/env python |
| 2 # |
| 3 # Copyright 2015 The Chromium Authors. All rights reserved. |
| 4 # Use of this source code is governed by a BSD-style license that can be |
| 5 # found in the LICENSE file. |
| 6 |
| 7 """Fingerprints the V8 snapshot blob files. |
| 8 |
| 9 Constructs a SHA256 fingerprint of the V8 natives and snapshot blob files and |
| 10 creates a .cc file which includes these fingerprint as variables. |
| 11 """ |
| 12 |
| 13 import hashlib |
| 14 import optparse |
| 15 import os |
| 16 import sys |
| 17 |
| 18 _HEADER = """// Copyright 2015 The Chromium Authors. All rights reserved. |
| 19 // Use of this source code is governed by a BSD-style license that can be |
| 20 // found in the LICENSE file. |
| 21 |
| 22 // This file was generated by fingerprint_v8_snapshot.py. |
| 23 |
| 24 namespace gin { |
| 25 """ |
| 26 |
| 27 _FOOTER = """ |
| 28 } // namespace gin |
| 29 """ |
| 30 |
| 31 |
| 32 def FingerprintFile(file_path): |
| 33 input_file = open(file_path, 'rb') |
| 34 sha256 = hashlib.sha256() |
| 35 while True: |
| 36 block = input_file.read(sha256.block_size) |
| 37 if not block: |
| 38 break |
| 39 sha256.update(block) |
| 40 return sha256.digest() |
| 41 |
| 42 |
| 43 def WriteFingerprint(output_file, variable_name, fingerprint): |
| 44 output_file.write('\nextern const unsigned char %s[] = { ' % variable_name) |
| 45 for byte in fingerprint: |
| 46 output_file.write(str(ord(byte)) + ', ') |
| 47 output_file.write('};\n') |
| 48 |
| 49 |
| 50 def WriteOutputFile(natives_fingerprint, |
| 51 snapshot_fingerprint, |
| 52 output_file_path): |
| 53 output_dir_path = os.path.dirname(output_file_path) |
| 54 if not os.path.exists(output_dir_path): |
| 55 os.makedirs(output_dir_path) |
| 56 output_file = open(output_file_path, 'w') |
| 57 |
| 58 output_file.write(_HEADER) |
| 59 WriteFingerprint(output_file, 'g_natives_fingerprint', natives_fingerprint) |
| 60 output_file.write('\n') |
| 61 WriteFingerprint(output_file, 'g_snapshot_fingerprint', snapshot_fingerprint) |
| 62 output_file.write(_FOOTER) |
| 63 |
| 64 |
| 65 def main(): |
| 66 parser = optparse.OptionParser() |
| 67 |
| 68 parser.add_option('--snapshot_file', |
| 69 help='The input V8 snapshot blob file path.') |
| 70 parser.add_option('--natives_file', |
| 71 help='The input V8 natives blob file path.') |
| 72 parser.add_option('--output_file', |
| 73 help='The path for the output cc file which will be write.') |
| 74 |
| 75 options, _ = parser.parse_args() |
| 76 |
| 77 natives_fingerprint = FingerprintFile(options.natives_file) |
| 78 snapshot_fingerprint = FingerprintFile(options.snapshot_file) |
| 79 WriteOutputFile( |
| 80 natives_fingerprint, snapshot_fingerprint, options.output_file) |
| 81 |
| 82 return 0 |
| 83 |
| 84 |
| 85 if __name__ == '__main__': |
| 86 sys.exit(main()) |
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