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#

# Copyright 2015 Google Inc. All Rights Reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

#

"""Generates C++ static definition with content of binary files.

This script is used to embed content of binary files (such as Java .class

files) inside the C++ binary. It generates C++ code that statically

initializes byte array with the content of the specified binary files.

This script supports adding one or more files from either a directory or

a .zip archive. Files are filtered out through regular expression associated

with each such entry.

In addition to byte array with the content of each file, this script builds

a directory of imported files.

For example running:

python static_def_gen.py \

out.inl \

/tmp/file.jar:^(a/b/c|home)/.*\\.(class|bin)$

Will produce something like:

static constexpr uint8 kMyFile_bin[] = { 68, 69, 70, 88, 89, 90, };

static constexpr char kMyFile_bin_path[] = "a/b/c/MyFile.bin";

static constexpr uint8 kOne_class[] = { 71, 73, 72, };

static constexpr char kOne_class_path[] = "a/b/c/One.class";

static constexpr uint8 kTwo_class[] = { 65, 66, 67, };

static constexpr char kTwo_class_path[] = "home/Two.class";

static constexpr struct {

const char* path;

const char* extension;

const uint8* data;

int data_size;

} kBinaryFiles[] = {

{

kMyFile_bin_path,

"bin",

kMyFile_bin,

arraysize(kMyFile_bin)

},

{

kOne_class_path,

"class",

kOne_class,

arraysize(kOne_class)

},

{

kTwo_class_path,

"class",

kTwo_class,

arraysize(kTwo_class)

},

};

If /tmp/file.jar had a/b/c/file.txt or foreign/Main.class, these files would

be ignored.

Syntax:

static_def_gen.py <cc file> <entry>:<pattern> <entry>:<pattern> ...

where each entry is either a directory with .class files or a .jar file

and pattern is a regular expression selecting the files

"""

import os

import re

import sys

import zipfile

def EnumerateInputs(inputs):

"""Emumerates binary files in the provided paths."""

for current_input in inputs:

components = current_input.split(':', 2)

entry = components[0]

pattern = re.compile(components[1])

if os.path.isdir(entry):

for root, unused_subdirs, files in os.walk(entry):

for file_name in files:

full_path = os.path.join(root, file_name)

relative_path = os.path.relpath(full_path, entry)

if pattern.match(relative_path):

yield {

'path': relative_path,

'open': lambda full_path=full_path: open(full_path)

}

else:

jar = zipfile.ZipFile(entry, 'r')

for entry in jar.namelist():

if pattern.match(entry):

yield {

'path': entry,

'open': lambda jar=jar, entry=entry: jar.open(entry)

}

def _GetName(item):

"""Returns name of the C++ variable to use for the binary file data."""

return os.path.basename(item['path']).replace('.', '_').replace('$', '_')

def Generate(cc_file_path, inputs):

"""Main function of code generator."""

cc_file = open(cc_file_path, 'w+')

binary_files = sorted(EnumerateInputs(inputs),

key=lambda binary_file: binary_file['path'])

for binary_file in binary_files:

path = binary_file['path']

name = _GetName(binary_file)

cc_file.write('static constexpr uint8 k%s[] = { ' % name)

with binary_file['open']() as f:

byte = f.read(1)

while byte:

cc_file.write('%s, ' % str(ord(byte)))

byte = f.read(1)

cc_file.write('};\n')

cc_file.write('static constexpr char k%s_path[] = "%s";\n' % (name, path))

cc_file.write('\n')

cc_file.write('static constexpr struct {\n')

cc_file.write(' const char* path;\n')

cc_file.write(' const char* extension;\n')

cc_file.write(' const uint8* data;\n')

cc_file.write(' int data_size;\n')

cc_file.write('} kBinaryFiles[] = {\n')

for binary_file in binary_files:

path = binary_file['path']

name = _GetName(binary_file)

ext = re.sub('^\\.', '', os.path.splitext(path)[1])

cc_file.write(' {\n')

cc_file.write(' k%s_path,\n' % name)

cc_file.write(' "%s",\n' % ext)

cc_file.write(' k%s,\n' % name)

cc_file.write(' arraysize(k%s)\n' % name)

cc_file.write(' },\n')

cc_file.write('};\n')

cc_file.close()

def main():

if len(sys.argv) < 3 or sys.argv[1] in ['-?', '--?', '-h', '--help']:

print __doc__

sys.exit(-1)

Generate(sys.argv[1], sys.argv[2:])

if __name__ == '__main__':

main()