# File downloaded from https://github.com/dakhnod/Fossil-HR-SDK/
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import sys
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import os
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import json
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import crc32c
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import getopt
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class Packer:
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def __init__(self):
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self.file_block = bytearray()
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def put_int(self, content, length=4):
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self.file_block.extend(content.to_bytes(length, 'little'))
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def pack(self, input_dir_path, output_file_path):
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start_path = os.getcwd()
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if not os.path.isdir(input_dir_path):
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print('cannot find dir %s' % input_dir_path)
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exit()
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os.chdir(input_dir_path)
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with open('app.json', 'r') as json_file:
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app_meta = json.load(json_file)
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os.chdir('files')
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all_files = []
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dir_sizes = {}
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for files_dir_list in [('code', False), ('icons', False), ('layout', True), ('display_name', True), ('config', True)]:
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dir_size = 0
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files_dir = files_dir_list[0]
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append_null = files_dir_list[1]
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files = os.listdir(files_dir)
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os.chdir(files_dir)
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for file in sorted(files):
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print(f'packing {file}')
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with open(file, 'rb')as f:
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contents = bytearray(f.read())
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if append_null:
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contents.append(0)
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file_size = contents.__len__()
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all_files.append({
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'filename': file,
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'contents': contents,
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'size': file_size
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})
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dir_size = dir_size + file_size + file.__len__() + 4 # null byte + size bytes
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os.chdir(os.pardir)
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dir_sizes[files_dir] = dir_size
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offset_code = 88
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offset_icons = offset_code + dir_sizes['code']
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offset_layout = offset_icons + dir_sizes['icons']
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offset_display_name = offset_layout + dir_sizes['layout']
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offset_config = offset_display_name + dir_sizes['display_name']
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offset_file_end = offset_config + dir_sizes['config']
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self.file_block.extend([int(octet) for octet in app_meta['version'].split('.')])
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self.put_int(0)
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self.put_int(0)
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self.put_int(offset_code)
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self.put_int(offset_icons)
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self.put_int(offset_layout)
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self.put_int(offset_display_name)
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self.put_int(offset_display_name)
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self.put_int(offset_config)
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self.put_int(offset_file_end)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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self.put_int(0)
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for file in all_files:
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filename = file['filename']
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self.put_int(filename.__len__() + 1, 1)
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self.file_block.extend(filename.encode('utf-8'))
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self.put_int(0, 1) # null byte ending
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self.put_int(file['size'], 2)
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self.file_block.extend(file['contents'])
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os.chdir(start_path)
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identifier = all_files[0]['filename']
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full_file = bytearray()
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full_file.extend([0xFE, 0x15]) # file handle
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full_file.extend([0x03, 0x00]) # file version
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full_file.extend(int(0).to_bytes(4, 'little')) # file offset
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full_file.extend(self.file_block.__len__().to_bytes(4, 'little')) # file size
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full_file.extend(self.file_block)
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full_file.extend(crc32c.crc32c(self.file_block).to_bytes(4, 'little'))
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if output_file_path is None:
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output_file_path = identifier
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with open(output_file_path, 'wb') as output_file:
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output_file.write(full_file)
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def main():
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packer = Packer()
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input_dir_path = None
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output_file_path = None
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args, remainder = getopt.getopt(sys.argv[1:], 'i:o:', ['input=', 'output='])
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for key, value in args:
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if key in ['-i', '--input']:
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input_dir_path = value
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elif key in ['-o', '--output']:
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output_file_path = value
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packer.pack(input_dir_path, output_file_path)
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if __name__ == '__main__':
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main()
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