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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_sizes(filelist): |
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""" |
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Get sizes of list of signed files. |
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:param filelist: List of 1-6 signed files. |
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:type filelist: list(str) |
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""" |
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first = str(glob.glob(filelist[0])[0]) |
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size1 = os.path.getsize(first) # required |
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size2 = size3 = size4 = size5 = 0 |
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if len(filelist) >= 2: |
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second = str(glob.glob(filelist[1])[0]) |
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size2 = os.path.getsize(second) |
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if len(filelist) >= 3: |
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third = str(glob.glob(filelist[2])[0]) |
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size3 = os.path.getsize(third) |
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if len(filelist) >= 4: |
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fourth = str(glob.glob(filelist[3])[0]) |
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size4 = os.path.getsize(fourth) |
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if len(filelist) >= 5: |
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fifth = str(glob.glob(filelist[4])[0]) |
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size5 = os.path.getsize(fifth) |
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return [size1, size2, size3, size4, size5] |
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def make_starts(beginlength, capsize, pad, sizes, filecount): |
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""" |
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Get list of starting positions for each signed file. |
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:param beginlength: Length of beginning offset. |
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:type beginlength: int |
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:param capsize: Size of cap executable. |
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:type capsize: int |
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:param pad: Padding character. |
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:type pad: bytes |
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:param sizes: List of signed file sizes. |
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:type sizes: list(int) |
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:param filecount: Number of signed files. |
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:type filecount: int |
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""" |
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firstoffset = beginlength + capsize |
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start1 = ghetto_convert(firstoffset) |
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start2 = start3 = start4 = start5 = start6 = pad * 8 |
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if filecount >= 2: |
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secondoffset = firstoffset + sizes[0] # start of second file |
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start2 = ghetto_convert(secondoffset) |
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if filecount >= 3: |
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thirdoffset = secondoffset + sizes[1] # start of third file |
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start3 = ghetto_convert(thirdoffset) |
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if filecount >= 4: |
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fourthoffset = thirdoffset + sizes[2] # start of fourth file |
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start4 = ghetto_convert(fourthoffset) |
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if filecount >= 5: |
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fifthoffset = fourthoffset + sizes[3] # start of fifth file |
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start5 = ghetto_convert(fifthoffset) |
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if filecount == 6: |
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sixthoffset = fifthoffset + sizes[4] # start of sixth file |
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start6 = ghetto_convert(sixthoffset) |
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return [start1, start2, start3, start4, start5, start6] |
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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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folder = os.getcwd() if folder is None else folder |
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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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sizes = make_sizes(filelist) |
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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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starts = make_starts(beginlength, capsize, pad, sizes, filecount) |
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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(starts[0]) |
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file.write(starts[1]) |
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file.write(starts[2]) |
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file.write(starts[3]) |
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file.write(starts[4]) |
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file.write(starts[5]) |
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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, text="FILE"): |
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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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:param text: Writing <text>... |
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:type text: str |
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""" |
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with open(os.path.abspath(infile), "rb") as afile: |
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print("WRITING {1}...\n{0}".format(os.path.basename(infile), text)) |
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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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folder = os.getcwd() if folder is None else folder |
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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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capskel = "CAP VERSION {0}".format(bbconstants.CAP.version) |
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write_4k(os.path.normpath(utilities.grab_cap()), autoloader, capskel) |
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write_4k(os.path.join(folder, "offset.hex"), autoloader, "MAGIC OFFSET") |
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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
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