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winceextractor.py
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winceextractor.py
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#! /usr/bin/env python3
"""
WinCE Extractor: Extract compressed files from Windows CE ROMs.
"""
from typing import IO, BinaryIO, Union
import ctypes
import os
import sys
import io
import argparse
from wincedecompr.wincedecompr import CEDecompressROM
_IMGOFSINCREMENT = 0x1000
_IMAGE_DOS_SIGNATURE = 0x5A4D
_ROM_EXTRA = 9
_XIP_NAMELEN = 32
_PID_LENGTH = 10
_STD_EXTRA = 16
_E32OBJNAMEBYTES = 8
_IMAGE_FILE_RELOCS_STRIPPED = 0x0001
_IMAGE_SCN_CNT_CODE = 0x00000020
_IMAGE_SCN_CNT_INITIALIZED_DATA = 0x00000040
_IMAGE_SCN_CNT_UNINITIALIZED_DATA = 0x00000080
_IMAGE_SCN_COMPRESSED = 0x00002000
_ROM_SIGNATURE_OFFSET = 64
_ROM_SIGNATURE = 0x43454345
_MAX_ROM = 32
_EXP = 0
_IMP = 1
_RES = 2
_EXC = 3
_SEC = 4
_FIX = 5
_DEB = 6
_IMD = 7
_MSP = 8
_TLS = 9
_CBK = 10
_RS1 = 11
_RS2 = 12
_RS3 = 13
_RS4 = 14
_RS5 = 15
_ST_TEXT = 0
_ST_DATA = 1
_ST_PDATA = 2
_ST_RSRC = 3
_ST_OTHER = 4
_CECOMPRESS_ALLZEROS = 0
_CECOMPRESS_FAILED = 0xffffffff
_CEDECOMPRESS_FAILED = 0xffffffff
class FileType(object):
"""
An enum-like class denoting a ROM's file type.
"""
FT_BOOOFF = 0
FT_NBF = 1
FT_BIN = 2
class FileTime(ctypes.Structure):
"""
A structure for holding a filetime instance in a ROM entry.
"""
_fields_ = [("dwLowDateTime", ctypes.c_uint32),
("dwHighDateTime", ctypes.c_uint32)]
class Info(ctypes.Structure):
"""
A structure for holding information about units
in other structures.
"""
_fields_ = [("rva", ctypes.c_uint32),
("size", ctypes.c_uint32)]
class e32_rom(ctypes.Structure):
"""
A structure representing an e32_rom entry.
"""
_fields_ = [("e32_objcnt", ctypes.c_uint16),
("e32_imageflags", ctypes.c_uint16),
("e32_entryrva", ctypes.c_uint32),
("e32_vbase", ctypes.c_uint32),
("e32_subsysmajor", ctypes.c_uint16),
("e32_subsysminor", ctypes.c_uint16),
("e32_stackmax", ctypes.c_uint32),
("e32_vsize", ctypes.c_uint32),
("e32_sect14rva", ctypes.c_uint32),
("e32_sect14size", ctypes.c_uint32),
("e32_unit", Info * _ROM_EXTRA),
("e32_subsys", ctypes.c_uint16)]
class o32_rom(ctypes.Structure):
"""
A structure representing an o32_rom entry.
"""
_fields_ = [("o32_vsize", ctypes.c_uint32),
("o32_rva", ctypes.c_uint32),
("o32_psize", ctypes.c_uint32),
("o32_dataptr", ctypes.c_uint32),
("o32_realaddr", ctypes.c_uint32),
("o32_flags", ctypes.c_uint32)]
class RomHdr(ctypes.Structure):
"""
A structure representing a romhdr entry.
"""
_fields_ = [("dllfirst", ctypes.c_uint32),
("dlllast", ctypes.c_uint32),
("physfirst", ctypes.c_uint32),
("physlast", ctypes.c_uint32),
("nummods", ctypes.c_uint32),
("ulRAMStart", ctypes.c_uint32),
("ulRAMFree", ctypes.c_uint32),
("ulRAMEnd", ctypes.c_uint32),
("ulCopyEntries", ctypes.c_uint32),
("ulCopyOffset", ctypes.c_uint32),
("ulProfileLen", ctypes.c_uint32),
("ulProfileOffset", ctypes.c_uint32),
("numfiles", ctypes.c_uint32),
("ulKernelFlags", ctypes.c_uint32),
("ulFSRamPercent", ctypes.c_uint32),
("ulDrivglobstart", ctypes.c_uint32),
("ulDrivgloblen", ctypes.c_uint32),
("usCPUType", ctypes.c_uint16),
("usMiscFlags", ctypes.c_uint16),
("pExtensions", ctypes.c_uint32), # Originally void*, but Python makes pointers 8 bytes
# and it needs to be a 4 byte pointer.
("ulTrackingStart", ctypes.c_uint32),
("ulTrackingLen", ctypes.c_uint32)]
class TocEntry(ctypes.Structure):
"""
A structure representing a TOC entry.
"""
_fields_ = [("dwFileAttributes", ctypes.c_uint32),
("ftTime", FileTime),
("nFileSize", ctypes.c_uint32),
("lpszFileName", ctypes.c_uint32), # Originally void*, but Python makes pointers 8 bytes
# and it needs to be a 4 byte pointer.
("ulE32Offset", ctypes.c_uint32),
("ulO32Offset", ctypes.c_uint32),
("ulLoadOffset", ctypes.c_uint32)]
class FileEntry(ctypes.Structure):
"""
A structure representing a file entry.
"""
_fields_ = [("dwFileAttributes", ctypes.c_uint32),
("ftTime", FileTime),
("nRealFileSize", ctypes.c_uint32),
("nCompFileSize", ctypes.c_uint32),
("lpszFileName", ctypes.c_uint32), # Originally void*, but Python makes pointers 8 bytes
# and it needs to be a 4 byte pointer.
("ulLoadOffset", ctypes.c_uint32)]
class CopyEntry(ctypes.Structure):
"""
A structure representing a copy entry.
"""
_fields_ = [("ulSource", ctypes.c_uint32),
("ulDest", ctypes.c_uint32),
("ulCopyLen", ctypes.c_uint32),
("ulDestLen", ctypes.c_uint32)]
class XipChainEntry(ctypes.Structure):
"""
A structure representing a xipchain entry.
"""
_fields_ = [("pvAddr", ctypes.c_void_p),
("dwLength", ctypes.c_uint32),
("dwMaxLength", ctypes.c_uint32),
("usOrder", ctypes.c_uint16),
("usFlags", ctypes.c_uint16),
("dwVersion", ctypes.c_uint32),
("szName", ctypes.c_char * _XIP_NAMELEN),
("dwAlgoFlags", ctypes.c_uint32),
("dwKeyLen", ctypes.c_uint32),
("byPublicKey", ctypes.c_ubyte * 596)]
class XipChainInfo(ctypes.Structure):
"""
A structure holding information about a xipchain entry.
"""
_fields_ = [("cXIPs", ctypes.c_uint32),
("xipEntryStart", XipChainEntry)]
class RomPid(ctypes.Structure):
"""
A structure for holding information about extension entries.
"""
class _RomPidAnonUnion(ctypes.Union):
"""
Information about a rom pid sharing space with an array of DWORDs.
"""
class _RomPidUnionStruct(ctypes.Structure):
"""
Information about a rom pid.
"""
_fields_ = [("name", ctypes.c_char * (_PID_LENGTH - 4) * ctypes.sizeof(ctypes.c_uint32)),
("type", ctypes.c_uint32),
("pdata", ctypes.c_uint32),
# ("pdata", ctypes.c_void_p),
("length", ctypes.c_uint32),
("reserved", ctypes.c_uint32)]
_fields_ = [("dwPID", ctypes.c_uint32 * _PID_LENGTH),
("s", _RomPidUnionStruct)]
_anonymous_ = 'u'
_fields_ = [('u', _RomPidAnonUnion),
('pNextExt', ctypes.c_uint32)]
# ('pNextExt', ctypes.c_void_p)]
class ImageDosHeader(ctypes.Structure):
"""
A structure representing the header of DOS images.
"""
_fields_ = [("e_magic", ctypes.c_uint16),
("e_cblp", ctypes.c_uint16),
("e_cp", ctypes.c_uint16),
("e_crlc", ctypes.c_uint16),
("e_cparhdr", ctypes.c_uint16),
("e_minalloc", ctypes.c_uint16),
("e_maxalloc", ctypes.c_uint16),
("e_ss", ctypes.c_uint16),
("e_sp", ctypes.c_uint16),
("e_csum", ctypes.c_uint16),
("e_ip", ctypes.c_uint16),
("e_cs", ctypes.c_uint16),
("e_lfarlc", ctypes.c_uint16),
("e_ovno", ctypes.c_uint16),
("e_res", ctypes.c_uint16 * 4),
("e_oemid", ctypes.c_uint16),
("e_oeminfo", ctypes.c_uint16),
("e_res2", ctypes.c_uint16 * 10),
("e_lfanew", ctypes.c_int32)]
class e32_exe(ctypes.Structure):
"""
A structure representing a e32_exe entry.
"""
_fields_ = [("e32_magic", ctypes.c_ubyte * 4),
("e32_cpu", ctypes.c_uint16),
("e32_objcnt", ctypes.c_uint16),
("e32_timestamp", ctypes.c_uint32),
("e32_symtaboff", ctypes.c_uint32),
("e32_symcount", ctypes.c_uint32),
("e32_opthdrsize", ctypes.c_uint16),
("e32_imageflags", ctypes.c_uint16),
("e32_coffmagic", ctypes.c_uint16),
("e32_linkmajor", ctypes.c_ubyte),
("e32_linkminor", ctypes.c_ubyte),
("e32_codesize", ctypes.c_uint32),
("e32_initdsize", ctypes.c_uint32),
("e32_uninitdsize", ctypes.c_uint32),
("e32_entryrva", ctypes.c_uint32),
("e32_codebase", ctypes.c_uint32),
("e32_database", ctypes.c_uint32),
("e32_vbase", ctypes.c_uint32),
("e32_objalign", ctypes.c_uint32),
("e32_filealign", ctypes.c_uint32),
("e32_osmajor", ctypes.c_uint16),
("e32_osminor", ctypes.c_uint16),
("e32_usermajor", ctypes.c_uint16),
("e32_userminor", ctypes.c_uint16),
("e32_subsysmajor", ctypes.c_uint16),
("e32_subsysminor", ctypes.c_uint16),
("e32_res1", ctypes.c_uint32),
("e32_vsize", ctypes.c_uint32),
("e32_hdrsize", ctypes.c_uint32),
("e32_filechksum", ctypes.c_uint32),
("e32_subsys", ctypes.c_uint16),
("e32_dllflags", ctypes.c_uint16),
("e32_stackmax", ctypes.c_uint32),
("e32_stackinit", ctypes.c_uint32),
("e32_heapmax", ctypes.c_uint32),
("e32_heapinit", ctypes.c_uint32),
("e32_res2", ctypes.c_uint32),
("e32_hdrextra", ctypes.c_uint32),
("e32_unit", Info * _STD_EXTRA)]
class o32_obj(ctypes.Structure):
"""
A structure for representing an o32_obj entry.
"""
_fields_ = [("o32_name", ctypes.c_ubyte * _E32OBJNAMEBYTES),
("o32_vsize", ctypes.c_uint32),
("o32_rva", ctypes.c_uint32),
("o32_psize", ctypes.c_uint32),
("o32_dataptr", ctypes.c_uint32),
("o32_realaddr", ctypes.c_uint32),
("o32_access", ctypes.c_uint32),
("o32_temp3", ctypes.c_uint32),
("o32_flags", ctypes.c_uint32)]
class B000FFHeader(ctypes.Structure):
"""
A structure holding the header of a B000FF file.
"""
_fields_ = [("signature", ctypes.c_char * 7),
("imgstart", ctypes.c_uint32),
("imglength", ctypes.c_uint32),
("blockstart", ctypes.c_uint32),
("blocklength", ctypes.c_uint32),
("blockchecksum", ctypes.c_uint32),
("data", ctypes.c_ubyte * 1)]
def write_blanks(f: IO, n_blanks: int) -> None:
"""
Extends the current file by n_blanks amount of bytes from the current position.
:param f: file to extend
:param n_blanks: number of bytes to extend by
:return: None
"""
f.seek(n_blanks, io.SEEK_CUR)
def write_alignment(f: IO, page_size: int) -> None:
"""
Writes blanks to the given file to fill the current page size gap.
:param f: file to write to
:param page_size: a page size
:return: None
"""
cur_ofs = f.tell()
if cur_ofs % page_size != 0:
write_blanks(f, page_size - (cur_ofs % page_size))
def write_dummy_mz_header(f: BinaryIO) -> None:
"""
Writes a image DOS header to the given file.
:param f: file to write to
:return: None
"""
dos = ImageDosHeader()
dos.e_magic = _IMAGE_DOS_SIGNATURE
dos.e_cblp = 0x90
dos.e_cp = 3
dos.e_cparhdr = 0x4
dos.e_maxalloc = 0xffff
dos.e_sp = 0xb8
dos.e_lfarlc = 0x40
dos.e_lfanew = 0xc0
doscode = bytes([0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd, 0x21, 0xb8, 0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72, 0x61, 0x6d, 0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e, 0x20, 0x69, 0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])
f.write(dos)
f.write(doscode)
write_blanks(f, 0x40)
def filetime_to_time_t(pft: FileTime) -> int:
"""
Converts a filetime structure to a time_t value.
:param pft: a filetime structure
:return: a time_t value
"""
t = pft.dwHighDateTime
t <<= 32
t |= pft.dwLowDateTime
t //= 10000000
t -= 11644473600
return t
def read_dword(data: bytes, offset: int, byteorder: str) -> int:
"""
Reads a ctypes.c_uint32 integer from the given data at the given offset.
:param data: input data
:param offset: offset to starting reading
:param byteorder: order to read the bytes in
:return: a ctypes.c_uint32 integer
"""
return int.from_bytes(data[offset:offset + ctypes.sizeof(ctypes.c_uint32)], byteorder=byteorder)
def load_from_offset(data: bytes, offset: int, structure: ctypes.Structure) -> ctypes.Structure:
"""
Loads information from the given sequence of bytes and offset into a specified
structure type.
:param data: input data
:param offset: offset to start reading
:param structure: the type of structure to create and fill
:return: a structure that is to be filled from the bytes at the given offset
"""
return structure.from_buffer_copy(data[offset:offset + ctypes.sizeof(structure)])
def set_to_image_start(in_f: BinaryIO, byteorder: str) -> bool:
"""
Moves the given file's position to the start of a Win CE ROM file.
:param in_f: input file
:param byteorder: byte ordering to read in values
:return: None
"""
while True:
n = in_f.read(ctypes.sizeof(ctypes.c_uint32))
if len(n) != ctypes.sizeof(ctypes.c_uint32):
return False
offset = int.from_bytes(n, byteorder=byteorder)
if offset == _ROM_SIGNATURE:
in_f.seek(-_ROM_SIGNATURE_OFFSET - 4, io.SEEK_CUR)
return True
in_f.seek(-1, io.SEEK_CUR)
def read_null_terminated_string(data: bytes, offset: int, encoding: str = 'ascii') -> str:
"""
Returns a null terminated string starting from the given offset
into the given data.
:param data: a continous sequence of bytes
:param offset: offset to start looking
:param encoding: an encoding to interpret the string
:return: the found string
"""
start = offset
current = offset
while data[current] != 0:
current += 1
return data[start:current].decode(encoding)
class DecompressionFailedException(Exception):
def __init__(self):
super().__init__()
class WinCEExtractor(object):
"""
Extracts information and files from a Windows CE ROM file.
"""
def __init__(self, file_obj: BinaryIO, image_start: int = None):
self.romhdr_offset = 0
self.load_offset = 0
self.in_file = file_obj
if image_start is None:
set_to_image_start(file_obj, byteorder='little')
else:
file_obj.seek(image_start, io.SEEK_CUR)
self.data = None
self.modules = []
self.files = []
def __enter__(self):
self.analyze()
return self
def __exit__(self, type_, value, traceback):
del self.data
del self.modules
del self.files
def analyze(self) -> None:
"""
Starts analysis on the ROM file. Collects modules and files.
:return: None
"""
self.data = self.in_file.read()
self.modules.clear()
self.files.clear()
self.romhdr_offset = read_dword(self.data, _ROM_SIGNATURE_OFFSET + 8, byteorder='little')
self.load_offset = read_dword(self.data, _ROM_SIGNATURE_OFFSET + 4, byteorder='little') - self.romhdr_offset
romhdr_s = load_from_offset(self.data, self.romhdr_offset, RomHdr)
for i in range(romhdr_s.nummods):
toc_s = load_from_offset(self.data,
self.romhdr_offset + ctypes.sizeof(RomHdr) + (ctypes.sizeof(TocEntry) * i),
TocEntry)
self.modules.append(WinModule(self, toc_s, romhdr_s))
toc_f_offset = self.romhdr_offset + ctypes.sizeof(RomHdr) + (ctypes.sizeof(TocEntry) * romhdr_s.nummods)
for i in range(romhdr_s.numfiles):
toc_f_s = load_from_offset(self.data, toc_f_offset + (ctypes.sizeof(FileEntry) * i), FileEntry)
self.files.append(WinFile(self, toc_f_s))
def minus_load_offset(self, offset: int) -> int:
"""
Gives back an offset that was subtracted by the currently
known loading offset.
:param offset: a given offset
:return: the given offset subtracted by a known load offset
"""
return offset - self.load_offset
def extract_data(self, out_f: BinaryIO, offset: int, datasize: int, is_compressed: bool,
max_uncompressed_size: int) -> int:
"""
Uses the CEDecompressROM Windows decompression algorithm to decompress the ROM data and write out its files.
:param out_f: file to write to
:param offset: the beginning of the o32_rom object
:param datasize: size of the o32_rom object
:param is_compressed: whether the contents are compressed and need to be decompressed first
:param max_uncompressed_size: the amount of data to uncompress
:return: how many bytes were written
"""
buf = memoryview(self.data)[offset:offset + datasize]
buf_len = datasize
if datasize != max_uncompressed_size and is_compressed:
decompressed_buf = bytearray(max_uncompressed_size + 4096)
buf_len = CEDecompressROM(buf, datasize, decompressed_buf, max_uncompressed_size, 0, 1, 4096)
if buf_len != _CEDECOMPRESS_FAILED:
buf = decompressed_buf
else:
raise DecompressionFailedException()
return out_f.write(buf[:buf_len])
class WinEntry(object):
"""
A class holding either a toc_entry or a file_entry and ability to write out their contents to a file.
"""
def __init__(self, extractor: WinCEExtractor, entry: Union[TocEntry, FileEntry]):
self.extractor = extractor
self.entry = entry
self.file_name = read_null_terminated_string(self.extractor.data,
self.extractor.minus_load_offset(self.entry.lpszFileName))
def write_to(self, out_f: BinaryIO) -> None:
"""
Writes out the contents of the current entry to the given file.
:param out_f: file to write to
:return: None
"""
raise NotImplementedError()
class WinFile(WinEntry):
def __init__(self, extractor: WinCEExtractor, entry: FileEntry):
super().__init__(extractor, entry)
def write_to(self, out_f: BinaryIO) -> None:
"""
Writes out the contents of the current entry to the given file.
:param out_f: file to write to
:return: None
"""
self.extractor.extract_data(out_f, self.extractor.minus_load_offset(self.entry.ulLoadOffset),
self.entry.nCompFileSize, self.entry.nCompFileSize != self.entry.nRealFileSize,
self.entry.nRealFileSize)
class WinModule(WinEntry):
SEGMENT_NAMES = [".text", ".data", ".pdata", ".rsrc", ".other"]
def __init__(self, extractor: WinCEExtractor, toc: TocEntry, rom: RomHdr):
super().__init__(extractor, toc)
self.__segment_name_usage = [0, 0, 0, 0, 0]
self.rom = rom
self.e32 = load_from_offset(self.extractor.data, self.extractor.minus_load_offset(toc.ulE32Offset), e32_rom)
self.o32_offset = self.extractor.minus_load_offset(toc.ulO32Offset)
self.o32_roms = []
for i in range(self.e32.e32_objcnt):
self.o32_roms.append(
load_from_offset(self.extractor.data, self.o32_offset + (ctypes.sizeof(o32_rom) * i), o32_rom))
def write_to(self, out_f: BinaryIO) -> None:
"""
Writes out the contents of the current entry to the given file.
:param out_f: file to write to
:return: None
"""
write_dummy_mz_header(out_f)
e32_ofs = out_f.tell()
self.__write_e32_header(out_f)
o32_ofs_list = []
data_ofs_list = []
data_len_list = []
for o32_s in self.o32_roms:
o32_ofs_list.append(out_f.tell())
self.__write_o32_header(out_f, o32_s)
write_alignment(out_f, 0x200)
header_size = out_f.tell()
for o32_s in self.o32_roms:
data_ofs_list.append(out_f.tell())
data_len = self.extractor.extract_data(out_f, self.extractor.minus_load_offset(o32_s.o32_dataptr),
min(o32_s.o32_vsize, o32_s.o32_psize),
(o32_s.o32_flags & _IMAGE_SCN_COMPRESSED) != 0, o32_s.o32_vsize)
data_len_list.append(data_len)
write_alignment(out_f, 0x200)
total_file_size = out_f.tell()
for i, _ in enumerate(self.o32_roms):
out_f.seek(o32_ofs_list[i] + 16, io.SEEK_SET)
out_f.write(data_len_list[i].to_bytes(ctypes.sizeof(ctypes.c_uint32), byteorder=sys.byteorder))
out_f.write(data_ofs_list[i].to_bytes(ctypes.sizeof(ctypes.c_uint32), byteorder=sys.byteorder))
out_f.seek(e32_ofs + 0x54, io.SEEK_SET) # ofs to e32_hdrsize
out_f.write(header_size.to_bytes(ctypes.sizeof(ctypes.c_uint32), byteorder=sys.byteorder))
out_f.seek(total_file_size, io.SEEK_SET)
def __write_e32_header(self, out_f: BinaryIO) -> None:
"""
Writes an e32 object to the file.
:param out_f: file to write to
:return: None
"""
pe32 = e32_exe()
pe32.e32_magic[0] = ord('P')
pe32.e32_magic[1] = ord('E')
pe32.e32_cpu = self.rom.usCPUType
pe32.e32_objcnt = self.e32.e32_objcnt
pe32.e32_timestamp = filetime_to_time_t(self.entry.ftTime)
pe32.e32_symtaboff = 0
pe32.e32_symcount = 0
pe32.e32_opthdrsize = 0xe0
pe32.e32_imageflags = self.e32.e32_imageflags | _IMAGE_FILE_RELOCS_STRIPPED
pe32.e32_coffmagic = 0x10b
pe32.e32_linkmajor = 6
pe32.e32_linkminor = 1
pe32.e32_codesize = self.__calculate_segment_size_sum(_IMAGE_SCN_CNT_CODE)
pe32.e32_initdsize = self.__calculate_segment_size_sum(_IMAGE_SCN_CNT_INITIALIZED_DATA)
pe32.e32_uninitdsize = self.__calculate_segment_size_sum(_IMAGE_SCN_CNT_UNINITIALIZED_DATA)
pe32.e32_entryrva = self.e32.e32_entryrva
pe32.e32_codebase = self.__find_first_segment(_IMAGE_SCN_CNT_CODE)
pe32.e32_database = self.__find_first_segment(_IMAGE_SCN_CNT_INITIALIZED_DATA)
pe32.e32_vbase = self.e32.e32_vbase
pe32.e32_objalign = 0x1000
pe32.e32_filealign = 0x200
pe32.e32_osmajor = 4
pe32.e32_osminor = 0
pe32.e32_subsysmajor = self.e32.e32_subsysmajor
pe32.e32_subsysminor = self.e32.e32_subsysminor
pe32.e32_vsize = self.e32.e32_vsize
pe32.e32_filechksum = 0
pe32.e32_subsys = self.e32.e32_subsys
pe32.e32_stackmax = self.e32.e32_stackmax
pe32.e32_stackinit = 0x1000
pe32.e32_heapmax = 0x100000
pe32.e32_heapinit = 0x1000
pe32.e32_hdrextra = _STD_EXTRA
pe32.e32_unit[_EXP] = self.e32.e32_unit[_EXP]
pe32.e32_unit[_IMP] = self.e32.e32_unit[_IMP]
pe32.e32_unit[_RES] = self.e32.e32_unit[_RES]
pe32.e32_unit[_EXC] = self.e32.e32_unit[_EXC]
pe32.e32_unit[_SEC] = self.e32.e32_unit[_SEC]
pe32.e32_unit[_IMD] = self.e32.e32_unit[_IMD]
pe32.e32_unit[_MSP] = self.e32.e32_unit[_MSP]
pe32.e32_unit[_RS4].rva = self.e32.e32_sect14rva
pe32.e32_unit[_RS4].size = self.e32.e32_sect14size
out_f.write(pe32)
def __write_o32_header(self, out_f: BinaryIO, o32: o32_rom) -> None:
"""
Writes an o32 object to the file.
:param out_f: file to write to
:param o32: o32_rom structure
:return: None
"""
po32 = o32_obj()
if self.e32.e32_unit[_RES].rva == o32.o32_rva and self.e32.e32_units[_RES].size == o32.o32_vsize:
seg_type = _ST_RSRC
elif self.e32.e32_unit[_EXC].rva == o32.o32_rva and self.e32.e32_unit[_EXC].size == o32.o32_vsize:
seg_type = _ST_PDATA
elif (o32.o32_flags & _IMAGE_SCN_CNT_CODE) != 0:
seg_type = _ST_TEXT
elif (o32.o32_flags & _IMAGE_SCN_CNT_INITIALIZED_DATA) != 0:
seg_type = _ST_DATA
elif (o32.o32_flags & _IMAGE_SCN_CNT_UNINITIALIZED_DATA) != 0:
seg_type = _ST_PDATA
else:
seg_type = _ST_OTHER
segment_name = WinModule.SEGMENT_NAMES[seg_type]
if self.__segment_name_usage[seg_type] != 0:
segment_name += str(self.__segment_name_usage[seg_type])
po32.o32_name[:] = segment_name.encode('ascii')[:_E32OBJNAMEBYTES].ljust(_E32OBJNAMEBYTES, '\0'.encode('ascii'))
self.__segment_name_usage[seg_type] += 1
po32.o32_vsize = o32.o32_vsize
po32.o32_rva = o32.o32_realaddr - self.e32.e32_vbase
po32.o32_psize = 0
po32.o32_dataptr = 0
po32.o32_realaddr = 0
po32.o32_access = 0
po32.o32_temp3 = 0
po32.o32_flags = o32.o32_flags & (~_IMAGE_SCN_COMPRESSED)
out_f.write(po32)
def __calculate_segment_size_sum(self, segtype_flag: int) -> int:
"""
Sums up all the o32 objects' vsize that match the segment type flags.
:param segtype_flag: a flag of some sort
:return: sum of vsizes
"""
return sum(o32_s.o32_vsize for o32_s in self.o32_roms if (o32_s.o32_flags & segtype_flag) != 0)
def __find_first_segment(self, segtype_flag: int) -> int:
"""
Finds the first o32 that matches the given segment type flags.
:param segtype_flag: the current flags to check
:return: The o32 rva of the o32 object that matches the given flag, otherwise 0
"""
for o32_s in self.o32_roms:
if (o32_s.o32_flags & segtype_flag) != 0:
return o32_s.o32_rva
return 0
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('-d', metavar='dirpath', help='save found files/modules to this path')
parser.add_argument('-o', metavar='offset', type=int, help='offset of the image file')
parser.add_argument('image_file', help='ROM image to extract')
args = parser.parse_args()
image_file = args.image_file
output_dir = args.d
image_offset = args.o
if not os.path.isfile(image_file):
print(f'Cannot find file: {image_file}', file=sys.stderr)
exit(1)
if output_dir is not None:
if not os.path.exists(output_dir):
os.makedirs(output_dir)
elif not os.path.isdir(output_dir):
print(f'{output_dir} is not a valid directory', file=sys.stderr)
exit(1)
if image_offset is not None and image_offset < 0:
print(f'Image offset cannot be less than 0', file=sys.stderr)
with open(image_file, 'r+b') as f:
with WinCEExtractor(f, image_offset) as extractor:
if output_dir is not None:
for module in extractor.modules:
with open(os.path.join(output_dir, module.file_name), 'w+b') as module_file:
try:
module.write_to(module_file)
except DecompressionFailedException:
print(f'Error decompressing file: {module.file_name}', file=sys.stderr)
for file_e in extractor.files:
with open(os.path.join(output_dir, file_e.file_name), 'w+b') as file_file:
try:
file_e.write_to(file_file)
except DecompressionFailedException:
print(f'Error decompressing file: {file_e.file_name}', file=sys.stderr)
if output_dir is not None:
print(f'File extraction complete. Please check your output directory: {output_dir}')