# Source code for binaryninja.fileaccessor

    # Copyright (c) 2015-2017 Vector 35 LLC
    #
    # 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 binaryninja import _binaryninjacore as core

    class FileAccessor(object):
    	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)

    	def __len__(self):
    		return self.get_length()

    	def _get_length(self, ctxt):
    		try:
    			return self.get_length()
    		except:
    			log.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.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.log_error(traceback.format_exc())
    			return 0

    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

    	def get_length(self):
    		return self._cb.getLength(self._cb.context)

    	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]

    	def write(self, offset, value):
    		value = str(value)
    		data = ctypes.create_string_buffer(value)
    		return self._cb.write(self._cb.context, offset, data, len(value))