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#!/usr/bin/env python
# Copyright 2017 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.
"""A tool for interacting with .pak files.
For details on the pak file format, see:
https://dev.chromium.org/developers/design-documents/linuxresourcesandlocalizedstrings
"""
from __future__ import print_function
import argparse
import gzip
import hashlib
import os
import shutil
import sys
import tempfile
# Import grit first to get local third_party modules.
import grit # pylint: disable=ungrouped-imports,unused-import
import six
from grit.format import data_pack
def _RepackMain(args):
output_info_filepath = args.output_pak_file + '.info'
if args.compress:
# If the file needs to be compressed, call RePack with a tempfile path,
# then compress the tempfile to args.output_pak_file.
temp_outfile = tempfile.NamedTemporaryFile()
out_path = temp_outfile.name
# Strip any non .pak extension from the .info output file path.
splitext = os.path.splitext(args.output_pak_file)
if splitext[1] != '.pak':
output_info_filepath = splitext[0] + '.info'
else:
out_path = args.output_pak_file
data_pack.RePack(out_path, args.input_pak_files, args.whitelist,
args.suppress_removed_key_output,
output_info_filepath=output_info_filepath)
if args.compress:
with open(args.output_pak_file, 'wb') as out:
with gzip.GzipFile(filename='', mode='wb', fileobj=out, mtime=0) as outgz:
shutil.copyfileobj(temp_outfile, outgz)
def _ExtractMain(args):
pak = data_pack.ReadDataPack(args.pak_file)
if args.textual_id:
info_dict = data_pack.ReadGrdInfo(args.pak_file)
for resource_id, payload in pak.resources.items():
filename = (
info_dict[resource_id].textual_id
if args.textual_id else str(resource_id))
path = os.path.join(args.output_dir, filename)
with open(path, 'w') as f:
f.write(payload)
def _CreateMain(args):
pak = {}
for name in os.listdir(args.input_dir):
try:
resource_id = int(name)
except:
continue
filename = os.path.join(args.input_dir, name)
if os.path.isfile(filename):
with open(filename, 'rb') as f:
pak[resource_id] = f.read()
data_pack.WriteDataPack(pak, args.output_pak_file, data_pack.UTF8)
def _PrintMain(args):
pak = data_pack.ReadDataPack(args.pak_file)
if args.textual_id:
info_dict = data_pack.ReadGrdInfo(args.pak_file)
output = args.output
encoding = 'binary'
if pak.encoding == 1:
encoding = 'utf-8'
elif pak.encoding == 2:
encoding = 'utf-16'
else:
encoding = '?' + str(pak.encoding)
output.write('version: {}\n'.format(pak.version))
output.write('encoding: {}\n'.format(encoding))
output.write('num_resources: {}\n'.format(len(pak.resources)))
output.write('num_aliases: {}\n'.format(len(pak.aliases)))
breakdown = ', '.join('{}: {}'.format(*x) for x in pak.sizes)
output.write('total_size: {} ({})\n'.format(pak.sizes.total, breakdown))
try_decode = args.decode and encoding.startswith('utf')
# Print IDs in ascending order, since that's the order in which they appear in
# the file (order is lost by Python dict).
for resource_id in sorted(pak.resources):
data = pak.resources[resource_id]
canonical_id = pak.aliases.get(resource_id, resource_id)
desc = '<data>'
if try_decode:
try:
desc = six.text_type(data, encoding)
if len(desc) > 60:
desc = desc[:60] + u'...'
desc = desc.replace('\n', '\\n')
except UnicodeDecodeError:
pass
sha1 = hashlib.sha1(data).hexdigest()[:10]
if args.textual_id:
textual_id = info_dict[resource_id].textual_id
canonical_textual_id = info_dict[canonical_id].textual_id
output.write(
u'Entry(id={}, canonical_id={}, size={}, sha1={}): {}\n'.format(
textual_id, canonical_textual_id, len(data), sha1,
desc).encode('utf-8'))
else:
output.write(
u'Entry(id={}, canonical_id={}, size={}, sha1={}): {}\n'.format(
resource_id, canonical_id, len(data), sha1, desc).encode('utf-8'))
def _ListMain(args):
pak = data_pack.ReadDataPack(args.pak_file)
if args.textual_id or args.path:
info_dict = data_pack.ReadGrdInfo(args.pak_file)
fmt = ''.join([
'{id}', ' = {textual_id}' if args.textual_id else '',
' @ {path}' if args.path else '', '\n'
])
for resource_id in sorted(pak.resources):
item = info_dict[resource_id]
args.output.write(
fmt.format(textual_id=item.textual_id, id=item.id, path=item.path))
else:
for resource_id in sorted(pak.resources):
args.output.write('%d\n' % resource_id)
def main():
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawTextHelpFormatter)
# Subparsers are required by default under Python 2. Python 3 changed to
# not required, but didn't include a required option until 3.7. Setting
# the required member works in all versions (and setting dest name).
sub_parsers = parser.add_subparsers(dest='action')
sub_parsers.required = True
sub_parser = sub_parsers.add_parser('repack',
help='Combines several .pak files into one.')
sub_parser.add_argument('output_pak_file', help='File to create.')
sub_parser.add_argument('input_pak_files', nargs='+',
help='Input .pak files.')
sub_parser.add_argument('--whitelist',
help='Path to a whitelist used to filter output pak file resource IDs.')
sub_parser.add_argument('--suppress-removed-key-output', action='store_true',
help='Do not log which keys were removed by the whitelist.')
sub_parser.add_argument('--compress', dest='compress', action='store_true',
default=False, help='Compress output_pak_file using gzip.')
sub_parser.set_defaults(func=_RepackMain)
sub_parser = sub_parsers.add_parser('extract', help='Extracts pak file')
sub_parser.add_argument('pak_file')
sub_parser.add_argument('-o', '--output-dir', default='.',
help='Directory to extract to.')
sub_parser.add_argument(
'-t',
'--textual-id',
action='store_true',
help='Use textual resource ID (name) (from .info file) as filenames.')
sub_parser.set_defaults(func=_ExtractMain)
sub_parser = sub_parsers.add_parser('create',
help='Creates pak file from extracted directory.')
sub_parser.add_argument('output_pak_file', help='File to create.')
sub_parser.add_argument('-i', '--input-dir', default='.',
help='Directory to create from.')
sub_parser.set_defaults(func=_CreateMain)
sub_parser = sub_parsers.add_parser('print',
help='Prints all pak IDs and contents. Useful for diffing.')
sub_parser.add_argument('pak_file')
sub_parser.add_argument('--output', type=argparse.FileType('w'),
default=sys.stdout,
help='The resource list path to write (default stdout)')
sub_parser.add_argument('--no-decode', dest='decode', action='store_false',
default=True, help='Do not print entry data.')
sub_parser.add_argument(
'-t',
'--textual-id',
action='store_true',
help='Print textual ID (name) (from .info file) instead of the ID.')
sub_parser.set_defaults(func=_PrintMain)
sub_parser = sub_parsers.add_parser('list-id',
help='Outputs all resource IDs to a file.')
sub_parser.add_argument('pak_file')
sub_parser.add_argument('--output', type=argparse.FileType('w'),
default=sys.stdout,
help='The resource list path to write (default stdout)')
sub_parser.add_argument(
'-t',
'--textual-id',
action='store_true',
help='Print the textual resource ID (from .info file).')
sub_parser.add_argument(
'-p',
'--path',
action='store_true',
help='Print the resource path (from .info file).')
sub_parser.set_defaults(func=_ListMain)
args = parser.parse_args()
args.func(args)
if __name__ == '__main__':
main()
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