// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Mobius Forensic Toolkit
// Copyright (C) 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021,2022,2023 Eduardo Aguiar
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
// Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \file sequential_reader_adaptor.cc C++ API <i>mobius.io.sequential_reader_adaptor</i> class wrapper
//! \author Eduardo Aguiar
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include <pymobius.h>
#include "sequential_reader_adaptor.h"
#include "reader.h"
#include <mobius/exception.inc>
#include <stdexcept>

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Check if value is an instance of <i>sequential_reader_adaptor</i>
//! \param value Python value
//! \return true/false
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
bool
pymobius_io_sequential_reader_adaptor_check (PyObject *value)
{
  return PyObject_IsInstance (value, reinterpret_cast<PyObject *> (&io_sequential_reader_adaptor_t));
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Create <i>sequential_reader_adaptor</i> Python object from C++ object
//! \param obj C++ object
//! \return New sequential_reader_adaptor object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
PyObject *
pymobius_io_sequential_reader_adaptor_to_pyobject (const mobius::io::sequential_reader_adaptor& obj)
{
  PyObject *ret = _PyObject_New (&io_sequential_reader_adaptor_t);

  if (ret)
    ((io_sequential_reader_adaptor_o *) ret)->obj = new mobius::io::sequential_reader_adaptor (obj);

  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Create <i>sequential_reader_adaptor</i> C++ object from Python object
//! \param value Python value
//! \return Sequential_reader_adaptor object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
mobius::io::sequential_reader_adaptor
pymobius_io_sequential_reader_adaptor_from_pyobject (PyObject *value)
{
  if (!pymobius_io_sequential_reader_adaptor_check (value))
    throw std::invalid_argument (mobius::MOBIUS_EXCEPTION_MSG ("object must be an instance of mobius.io.sequential_reader_adaptor"));

  return * (reinterpret_cast <io_sequential_reader_adaptor_o *>(value)->obj);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>block_size</i> Attribute getter
//! \param self Object
//! \return <i>block_size</i> attribute
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_getter_block_size (io_sequential_reader_adaptor_o *self)
{
  PyObject *ret = nullptr;

  try
    {
      ret = mobius::py::pylong_from_std_uint64_t (self->obj->get_block_size ());
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
    }

  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Getters and setters structure
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyGetSetDef tp_getset[] =
{
  {
    (char *) "block_size",
    (getter) tp_getter_block_size,
    (setter) 0,
    (char *) "Read ahead block size in bytes",
    NULL
  },
  {NULL, NULL, NULL, NULL, NULL} // sentinel
};

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>peek</i> method implementation
//! \param self Object
//! \param args Argument list
//! \return Byte read
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_peek (io_sequential_reader_adaptor_o *self, PyObject *args)
{
  // Parse input args
  std::uint64_t arg_size;

  try
    {
      arg_size = mobius::py::get_arg_as_uint64_t (args, 0, 1);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }

  // Execute C++ function
  PyObject *ret = nullptr;

  try
    {
      if (arg_size == 1)
        ret = mobius::py::pylong_from_std_uint8_t (self->obj->peek ());

      else
        ret = mobius::py::pybytes_from_bytearray (self->obj->peek (arg_size));
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
    }

  // Return value
  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>get</i> method implementation
//! \param self Object
//! \param args Argument list
//! \return Byte read
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_get (io_sequential_reader_adaptor_o *self, PyObject *args)
{
  // Parse input args
  std::uint64_t arg_size;

  try
    {
      arg_size = mobius::py::get_arg_as_uint64_t (args, 0, 1);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }

  // Execute C++ function
  PyObject *ret = nullptr;

  try
    {
      if (arg_size == 1)
        ret = mobius::py::pylong_from_std_uint8_t (self->obj->get ());

      else
        ret = mobius::py::pybytes_from_bytearray (self->obj->get (arg_size));
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
    }

  // Return value
  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>skip</i> method implementation
//! \param self Object
//! \param args Argument list
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_skip (io_sequential_reader_adaptor_o *self, PyObject *args)
{
  // Parse input args
  std::uint64_t arg_size;

  try
    {
      arg_size = mobius::py::get_arg_as_uint64_t (args, 0);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }

  // Execute C++ function
  try
    {
      self->obj->skip (arg_size);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
      return nullptr;
    }

  // return None
  return mobius::py::pynone ();
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>tell</i> method implementation
//! \param self Object
//! \param args Argument list
//! \return Current reading position from the beginning of the reader
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_tell (io_sequential_reader_adaptor_o *self, PyObject *)
{
  // Execute C++ function
  PyObject *ret = nullptr;

  try
    {
      ret = mobius::py::pylong_from_std_uint64_t (self->obj->tell ());
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
    }

  // Return value
  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>eof</i> method implementation
//! \param self Object
//! \param args Argument list
//! \return True/False
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_f_eof (io_sequential_reader_adaptor_o *self, PyObject *)
{
  // Execute C++ function
  PyObject *ret = nullptr;

  try
    {
      ret = mobius::py::pybool_from_bool (self->obj->eof ());
    }
  catch (const std::exception& e)
    {
      mobius::py::set_runtime_error (e.what ());
    }

  // Return value
  return ret;
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Methods structure
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyMethodDef tp_methods[] =
{
  {
    (char *) "peek",
    (PyCFunction) tp_f_peek,
    METH_VARARGS,
    "Peek one or more bytes, without moving the reading position"
  },
  {
    (char *) "get",
    (PyCFunction) tp_f_get,
    METH_VARARGS,
    "Get one or more bytes"
  },
  {
    (char *) "skip",
    (PyCFunction) tp_f_skip,
    METH_VARARGS,
    "Skip size bytes forward"
  },
  {
    (char *) "tell",
    (PyCFunction) tp_f_tell,
    METH_VARARGS,
    "Get current reading position"
  },
  {
    (char *) "eof",
    (PyCFunction) tp_f_eof,
    METH_VARARGS,
    "Check if end-of-file (EOF) is reached"
  },
  {NULL, NULL, 0, NULL} // sentinel
};

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>sequential_reader_adaptor</i> Constructor
//! \param type Type object
//! \param args Argument list
//! \param kwds Keywords dict
//! \return new <i>sequential_reader_adaptor</i> object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static PyObject *
tp_new (PyTypeObject *type, PyObject *args, PyObject *)
{
  // Parse input args
  mobius::io::reader arg_reader;
  std::uint64_t arg_block_size;

  try
    {
      arg_reader = mobius::py::get_arg_as_cpp (args, 0, pymobius_io_reader_from_pyobject);
      arg_block_size = mobius::py::get_arg_as_uint64_t (args, 1, 65536);
    }
  catch (const std::exception& e)
    {
      mobius::py::set_invalid_type_error (e.what ());
      return nullptr;
    }


  // Create Python object
  io_sequential_reader_adaptor_o *ret = reinterpret_cast <io_sequential_reader_adaptor_o *> (type->tp_alloc (type, 0));

  if (ret)
    {
      try
        {
          ret->obj = new mobius::io::sequential_reader_adaptor (arg_reader, arg_block_size);
        }
      catch (const std::exception& e)
        {
          Py_DECREF (ret);
          mobius::py::set_runtime_error (e.what ());
          ret = nullptr;
        }
    }

  return reinterpret_cast <PyObject *> (ret);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief <i>sequential_reader_adaptor</i> deallocator
//! \param self Object
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
static void
tp_dealloc (io_sequential_reader_adaptor_o *self)
{
  delete self->obj;
  Py_TYPE (self)->tp_free ((PyObject*) self);
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//! \brief Type structure
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
PyTypeObject io_sequential_reader_adaptor_t =
{
  PyVarObject_HEAD_INIT (NULL, 0)
  "mobius.io.sequential_reader_adaptor",   		// tp_name
  sizeof (io_sequential_reader_adaptor_o), 		// tp_basicsize
  0,                                       		// tp_itemsize
  (destructor) tp_dealloc,                 		// tp_dealloc
  0,                                       		// tp_print
  0,                                       		// tp_getattr
  0,                                       		// tp_setattr
  0,                                       		// tp_compare
  0,                                       		// tp_repr
  0,                                       		// tp_as_number
  0,                                       		// tp_as_sequence
  0,                                       		// tp_as_mapping
  0,                                       		// tp_hash
  0,                                       		// tp_call
  0,                                       		// tp_str
  0,                                       		// tp_getattro
  0,                                       		// tp_setattro
  0,                                       		// tp_as_buffer
  Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,		// tp_flags
  "sequential_reader_adaptor class",       		// tp_doc
  0,                                       		// tp_traverse
  0,                                       		// tp_clear
  0,                                       		// tp_richcompare
  0,                                       		// tp_weaklistoffset
  0,                                       		// tp_iter
  0,                                       		// tp_iternext
  tp_methods,                              		// tp_methods
  0,                                       		// tp_members
  tp_getset,                               		// tp_getset
  0,                                       		// tp_base
  0,                                       		// tp_dict
  0,                                       		// tp_descr_get
  0,                                       		// tp_descr_set
  0,                                       		// tp_dictoffset
  0,                                       		// tp_init
  0,                                       		// tp_alloc
  tp_new,                                  		// tp_new
  0,                                       		// tp_free
  0,                                       		// tp_is_gc
  0,                                       		// tp_bases
  0,                                       		// tp_mro
  0,                                       		// tp_cache
  0,                                       		// tp_subclasses
  0,                                       		// tp_weaklist
  0,                                       		// tp_del
  0,                                       		// tp_version_tag
  0,                                       		// tp_finalize
};
