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// Copyright (C) 2013 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_SERIALIZE_PiCKLE_Hh_
#define DLIB_SERIALIZE_PiCKLE_Hh_
#include <dlib/serialize.h>
#include <pybind11/pybind11.h>
#include <sstream>
#include <dlib/vectorstream.h>
template<typename T>
py::tuple getstate(const T& item)
{
using namespace dlib;
std::vector<char> buf;
buf.reserve(5000);
vectorstream sout(buf);
serialize(item, sout);
return py::make_tuple(py::handle(
PyBytes_FromStringAndSize(buf.size()?&buf[0]:0, buf.size())));
}
template<typename T>
T setstate(py::tuple state)
{
using namespace dlib;
if (len(state) != 1)
{
PyErr_SetObject(PyExc_ValueError,
py::str("expected 1-item tuple in call to __setstate__; got {}").format(state).ptr()
);
throw py::error_already_set();
}
// We used to serialize by converting to a str but the boost.python routines for
// doing this don't work in Python 3. You end up getting an error about invalid
// UTF-8 encodings. So instead we access the python C interface directly and use
// bytes objects. However, we keep the deserialization code that worked with str
// for backwards compatibility with previously pickled files.
T item;
py::object obj = state[0];
if (py::isinstance<py::str>(obj))
{
py::str data = state[0].cast<py::str>();
std::string temp = data;
std::istringstream sin(temp);
deserialize(item, sin);
}
else if(PyBytes_Check(py::object(state[0]).ptr()))
{
py::object obj = state[0];
char* data = PyBytes_AsString(obj.ptr());
unsigned long num = PyBytes_Size(obj.ptr());
std::istringstream sin(std::string(data, num));
deserialize(item, sin);
}
else
{
throw error("Unable to unpickle, error in input file.");
}
return item;
}
#endif // DLIB_SERIALIZE_PiCKLE_Hh_
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