# Copyright (c) 2015-2024 Vector 35 Inc
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import traceback
import ctypes
# Binary Ninja components
from . import _binaryninjacore as core
from .log import log_error
[docs]
class FileAccessor:
def __init__(self):
self._cb = core.BNFileAccessor()
self._cb.context = 0
self._cb.getLength = self._cb.getLength.__class__(self._get_length)
self._cb.read = self._cb.read.__class__(self._read)
self._cb.write = self._cb.write.__class__(self._write)
[docs]
def get_length(self):
return NotImplemented
[docs]
def read(self, offset, length):
return NotImplemented
[docs]
def write(self, offset: int, data: bytes):
return NotImplemented
def __len__(self):
return self.get_length()
def _get_length(self, ctxt):
try:
return self.get_length()
except:
log_error(traceback.format_exc())
return 0
def _read(self, ctxt, dest, offset, length):
try:
data = self.read(offset, length)
if data is None:
return 0
if len(data) > length:
data = data[0:length]
ctypes.memmove(dest, data, len(data))
return len(data)
except:
log_error(traceback.format_exc())
return 0
def _write(self, ctxt, offset, src, length):
try:
data = ctypes.create_string_buffer(length)
ctypes.memmove(data, src, length)
return self.write(offset, data.raw)
except:
log_error(traceback.format_exc())
return 0
[docs]
class CoreFileAccessor(FileAccessor):
def __init__(self, accessor):
self._cb.context = accessor.context
self._cb.getLength = accessor.getLength
self._cb.read = accessor.read
self._cb.write = accessor.write
[docs]
def get_length(self):
return self._cb.getLength(self._cb.context)
[docs]
def read(self, offset, length):
data = ctypes.create_string_buffer(length)
length = self._cb.read(self._cb.context, data, offset, length)
return data.raw[0:length]
[docs]
def write(self, offset, value):
value = str(value)
data = ctypes.create_string_buffer(len(value))
return self._cb.write(self._cb.context, offset, data, len(value))