1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
#!/usr/bin/env python
# Copyright (c) 2012 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.
"""Support for formatting a data pack file used for platform agnostic resource
files.
"""
import collections
import exceptions
import os
import struct
import sys
if __name__ == '__main__':
sys.path.append(os.path.join(os.path.dirname(__file__), '../..'))
PACK_FILE_VERSION = 4
HEADER_LENGTH = 2 * 4 + 1 # Two uint32s. (file version, number of entries) and
# one uint8 (encoding of text resources)
BINARY, UTF8, UTF16 = range(3)
class WrongFileVersion(Exception):
pass
DataPackContents = collections.namedtuple(
'DataPackContents', 'resources encoding')
def ReadDataPack(input_file):
"""Reads a data pack file and returns a dictionary."""
data = open(input_file, "rb").read()
original_data = data
# Read the header.
version, num_entries, encoding = struct.unpack('<IIB', data[:HEADER_LENGTH])
if version != PACK_FILE_VERSION:
print 'Wrong file version in ', input_file
raise WrongFileVersion
resources = {}
if num_entries == 0:
return DataPackContents(resources, encoding)
# Read the index and data.
data = data[HEADER_LENGTH:]
kIndexEntrySize = 2 + 4 # Each entry is a uint16 and a uint32.
for _ in range(num_entries):
id, offset = struct.unpack('<HI', data[:kIndexEntrySize])
data = data[kIndexEntrySize:]
next_id, next_offset = struct.unpack('<HI', data[:kIndexEntrySize])
resources[id] = original_data[offset:next_offset]
return DataPackContents(resources, encoding)
def WriteDataPackToString(resources, encoding):
"""Returns a string with a map of id=>data in the data pack format."""
ids = sorted(resources.keys())
ret = []
# Write file header.
ret.append(struct.pack('<IIB', PACK_FILE_VERSION, len(ids), encoding))
HEADER_LENGTH = 2 * 4 + 1 # Two uint32s and one uint8.
# Each entry is a uint16 + a uint32s. We have one extra entry for the last
# item.
index_length = (len(ids) + 1) * (2 + 4)
# Write index.
data_offset = HEADER_LENGTH + index_length
for id in ids:
ret.append(struct.pack('<HI', id, data_offset))
data_offset += len(resources[id])
ret.append(struct.pack('<HI', 0, data_offset))
# Write data.
for id in ids:
ret.append(resources[id])
return ''.join(ret)
def WriteDataPack(resources, output_file, encoding):
"""Writes a map of id=>data into output_file as a data pack."""
content = WriteDataPackToString(resources, encoding)
with open(output_file, 'wb') as file:
file.write(content)
# Temporary hack for external programs that import data_pack.
# TODO(benrg): Remove this.
class DataPack(object):
pass
DataPack.ReadDataPack = staticmethod(ReadDataPack)
DataPack.WriteDataPackToString = staticmethod(WriteDataPackToString)
DataPack.WriteDataPack = staticmethod(WriteDataPack)
def main():
data = ReadDataPack("input.pak").resources
for (key,val) in data.items():
if "Chromium" in val:
data[key] = val.replace("Chromium", "GWT-Chromium")
WriteDataPack(data, "output.pak", UTF8)
if __name__ == '__main__':
main()
|
