Python-сообщество

00 00 00 00 - 'Тег' (всегда 0x00 0x00 0x00 0x00);
0F 00 00 00 - 'Длина пути и имени файла' (unsigned int);
00 20 79 01 - 'Размер файла' (unsigned int);
xx xx xx xx - 'Путь и имя файла' == 'значению' "Длина пути и имени файла"
xx xx xx xx - 'Контент' == 'значению' "Размер файла"

0000000:  00 00 00 00 0f 00 00 00  00 20 79 01 2f 69 6d 61  '......... y./ima'
0000010:  67 65 2f 61 6d 73 73 2e  6d 62 6e 7f 45 4c 46 01  'ge/amss.mbn.ELF.'
..................
1792010:  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 0f  '................'
1792020:  00 00 00 00 80 3d 00 2f  69 6d 61 67 65 2f 62 6f  '.....=./image/bo'
1792030:  6f 74 2e 69 6d 67 41 4e  44 52 4f 49 44 21 04 f0  'ot.imgANDROID!..'

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import struct
 
 
def iter_bin_image(filename):
    """ Yields name, file_size, file_data
    """
    image_size = os.path.getsize(filename)
    with open(filename, 'rb') as f:
        while f.tell() < image_size:
            tag, name_size, file_size = struct.unpack('III', f.read(12))
            name = f.read(name_size)
            yield name, file_size, f.read(file_size)
 
 
def extract_image(img_filename, output_folder='output'):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)
 
    for filename, size, data in iter_bin_image(img_filename):
        filename = filename.lstrip('/')
        filename = os.path.join(output_folder, os.path.normpath(filename))
        folder, name = os.path.split(filename)
        if not os.path.exists(folder):
            os.makedirs(folder)
        print('Saving: {} ({} bytes)'.format(filename, size))
        with open(filename, 'wb') as f:
            f.write(data)
 
 
if __name__ == "__main__":
    extract_image('data.dat')

import sys
import struct

def write_file_out(info, dirprefix):
    with open(dirprefix + info['path'], 'w') as f:
        f.write(info['content'])

def parse_files(binfile, prefix):
    while True:
        info = {}
        info['name_length'] = struct.unpack('i', binfile.read(4))[0]
        info['file_size'] = struct.unpack('i', binfile.read(4))[0]
        info['path'] = struct.unpack('s', binfile.read(info['name_length']))
        info['content'] = binfile.read(info['file_size'])
        yield info

def parse_main_file(path, dirprefix):
    with open(path, 'rb') as binfile:
        #read tag
        tag = binfile.read(4)
        #parse files and write em out
        try:
            for fileinfo in parse_files(binfile):
                write_file_out(fileinfo, dirprefix)
        except:
            pass

def main():
    parse_main_file(sys.argv[1], sys.argv[2])

if __name__ == '__main__':
    main()

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import struct
 
 
def extract_image(img_filename, output_folder='output'):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)
    with open(img_filename, 'rb') as img_fp:
        for filename, size in iter_bin_image(img_fp):
            filename = filename.lstrip('/')
            filename = os.path.join(output_folder, os.path.normpath(filename))
            folder, name = os.path.split(filename)
            if not os.path.exists(folder):
                os.makedirs(folder)
            print('Saving: {} ({} bytes)'.format(filename, size))
            with open(filename, 'wb') as output:
                copy_bytes(img_fp, output, size)
 
 
def iter_bin_image(img_fp):
    """
    Yields name, file_size. Allows to iter name/size
    without data consuming
    """
    image_size = os.fstat(img_fp.fileno()).st_size
    while img_fp.tell() < image_size:
        tag, name_size, file_size = struct.unpack('III', img_fp.read(12))
        name = str(img_fp.read(name_size))
        next_pos = img_fp.tell() + file_size
        yield name, file_size
        img_fp.seek(next_pos, os.SEEK_SET)
 
  
def copy_bytes(source_fp, dest_fp, bytes_to_copy, buff_size=1024*1024):
    while bytes_to_copy:
        if buff_size > bytes_to_copy:
            buff_size = bytes_to_copy
        data = source_fp.read(buff_size)
        if len(data) < buff_size:
            raise IOError('Unexpected end of file')
        dest_fp.write(data)
        bytes_to_copy -= buff_size