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#!/usr/bin/env python3 |
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"""This module is the Python-ized implementation of cap.exe""" |
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import os # path work |
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import binascii # to hex and back again |
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import glob # filename matching |
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import base64 # storage |
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from bbarchivist import bbconstants # versions/constants |
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from bbarchivist import utilities # finding cap |
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__author__ = "Thurask" |
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__license__ = "WTFPL v2" |
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__copyright__ = "Copyright 2015-2016 Thurask" |
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def ghetto_convert(intsize): |
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""" |
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Convert from decimal integer to little endian |
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hexadecimal string, padded to 16 characters with zeros. |
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:param intsize: Integer you wish to convert. |
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:type intsize: int |
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""" |
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if not isinstance(intsize, int): |
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intsize = int(intsize) |
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hexsize = format(intsize, '08x') # '00AABBCC' |
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newlist = [hexsize[i:i + 2] for i in range(0, len(hexsize), 2)] # ['00', 'AA','BB','CC'] |
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newlist.reverse() |
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ghetto_hex = "".join(newlist) # 'CCBBAA' |
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ghetto_hex = ghetto_hex.rjust(16, '0') |
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if len(ghetto_hex) == 16: |
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return binascii.unhexlify(bytes(ghetto_hex.upper(), 'ascii')) |
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def make_offset(files, folder=None): |
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""" |
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Create magic offset file for use in autoloader creation. |
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Cap.exe MUST match separator version. |
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Version defined in :data:`bbarchivist.bbconstants.CAP.version`. |
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:param files: List of 1-6 signed files. |
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:type files: list(str) |
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:param folder: Working folder. Optional. Default is local. |
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:type folder: str |
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""" |
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if folder is None: |
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folder = os.getcwd() |
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capfile = utilities.grab_cap() |
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filelist = [file for file in files if file] |
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filecount = len(filelist) |
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fcount = b'0' + bytes(str(filecount), 'ascii') |
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# immutable things |
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scaff = b'at9dFE5LTEdOT0hHR0lTCxcKDR4MFFMtPiU6LT0zPjs6Ui88U05GTVFOSUdRTlFOT3BwcJzVxZec1cWXnNXFlw==' |
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separator = base64.b64decode(scaff) |
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password = binascii.unhexlify(b'0' * 160) |
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pad = b'\x00' # 1x, 2x or 8x |
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filepad = binascii.unhexlify(fcount) # 01-06 |
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trailers = binascii.unhexlify(b'00' * (7 - filecount)) # 00, 1-6x |
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capsize = os.path.getsize(capfile) |
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if not filecount: # we need at least one file |
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raise SystemExit |
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first = str(glob.glob(filelist[0])[0]) |
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firstsize = os.path.getsize(first) # required |
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if filecount >= 2: |
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second = str(glob.glob(filelist[1])[0]) |
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secondsize = os.path.getsize(second) |
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if filecount >= 3: |
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third = str(glob.glob(filelist[2])[0]) |
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thirdsize = os.path.getsize(third) |
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if filecount >= 4: |
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fourth = str(glob.glob(filelist[3])[0]) |
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fourthsize = os.path.getsize(fourth) |
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if filecount >= 5: |
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fifth = str(glob.glob(filelist[4])[0]) |
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fifthsize = os.path.getsize(fifth) |
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# start of first file; length of cap + length of offset |
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beginlength = len(separator) + len(password) + 64 |
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firstoffset = beginlength + capsize |
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firststart = ghetto_convert(firstoffset) |
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secondstart = thirdstart = fourthstart = fifthstart = sixthstart = pad * 8 |
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if filecount >= 2: |
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secondoffset = firstoffset + firstsize # start of second file |
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secondstart = ghetto_convert(secondoffset) |
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if filecount >= 3: |
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thirdoffset = secondoffset + secondsize # start of third file |
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thirdstart = ghetto_convert(thirdoffset) |
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if filecount >= 4: |
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fourthoffset = thirdoffset + thirdsize # start of fourth file |
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fourthstart = ghetto_convert(fourthoffset) |
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if filecount >= 5: |
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fifthoffset = fourthoffset + fourthsize # start of fifth file |
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fifthstart = ghetto_convert(fifthoffset) |
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if filecount == 6: |
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sixthoffset = fifthoffset + fifthsize # start of sixth file |
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sixthstart = ghetto_convert(sixthoffset) |
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makeuplen = 64 - 6 * len(pad * 8) - 2 * len(pad * 2) - 2 * \ |
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len(pad) - len(trailers) - len(filepad) |
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makeup = b'\x00' * makeuplen # pad to match offset begin |
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with open(os.path.join(folder, "offset.hex"), "wb") as file: |
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file.write(separator) |
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file.write(password) |
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file.write(filepad) |
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file.write(pad * 2) |
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file.write(pad) |
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file.write(firststart) |
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file.write(secondstart) |
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file.write(thirdstart) |
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file.write(fourthstart) |
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file.write(fifthstart) |
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file.write(sixthstart) |
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file.write(pad) |
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file.write(pad * 2) |
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file.write(trailers) |
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file.write(makeup) |
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def write_4k(infile, outfile): |
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""" |
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Write a file from another file, 4k bytes at a time. |
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:param infile: Filename. Input file. |
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:type infile: str |
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:param outfile: Open (!!!) file handle. Output file. |
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:type outfile: str |
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""" |
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with open(os.path.abspath(infile), "rb") as afile: |
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print("WRITING FILE...\n{0}".format(os.path.basename(infile))) |
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while True: |
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chunk = afile.read(4096) # 4k chunks |
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if not chunk: |
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break |
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outfile.write(chunk) |
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def make_autoloader(filename, files, folder=None): |
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""" |
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Write cap.exe, magic offset, signed files to a .exe file. |
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:func:`make_offset` is used to create the offset. |
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:param filename: Name of autoloader. |
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:type filename: str |
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:param files: List of 1-6 signed files. |
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:type files: list(str) |
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:param folder: Working folder. Optional. Default is local. |
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:type folder: str |
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""" |
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if folder is None: |
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folder = os.getcwd() |
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make_offset(files, folder) |
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filelist = [os.path.abspath(file) for file in files if file] |
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print("CREATING: {0}".format(filename)) |
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try: |
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with open(os.path.join(os.path.abspath(folder), filename), "wb") as autoloader: |
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with open(os.path.normpath(utilities.grab_cap()), "rb") as capfile: |
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print("WRITING CAP VERSION {0}...".format(bbconstants.CAP.version)) |
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while True: |
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chunk = capfile.read(4096) # 4k chunks |
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if not chunk: |
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break |
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autoloader.write(chunk) |
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with open(os.path.join(folder, "offset.hex"), "rb") as offset: |
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print("WRITING MAGIC OFFSET...") |
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autoloader.write(offset.read()) |
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for file in filelist: |
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write_4k(file, autoloader) |
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except IOError as exc: |
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print("Operation failed: {0}".format(exc.strerror)) |
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else: |
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print("{0} FINISHED!".format(filename)) |
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os.remove(os.path.join(folder, "offset.hex")) |
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thurask /
bbarchivist
