upiwin/src/ep_resources.c

/*
 * UPIWIN - Micro Pi Windowing Framework Kernel
 * Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
 *
 * 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 of the License, 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *-------------------------------------------------------------------------
 */
#include <string.h>
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "wintype.h"
#include "scode.h"
#include "log.h"
#include "resources.h"
#include "ep_init.h"
#include "ep_types.h"

static PyObject *wrap_resource_file_handle(HRESFILE handle)
{
  PyObject *rc = NULL, *args, *kwargs;
  ResFileObject *presfile;

  args = PyTuple_New(0);
  if (args)
  {
    kwargs = PyDict_New();
    if (kwargs)
    {
      rc = PyType_GenericNew(&ResFileType, args, kwargs);
      if (rc)
      {
        presfile = (ResFileObject *)rc;
        presfile->hresfile = handle;
      }
      Py_DECREF(kwargs);
    }
    Py_DECREF(args);
  }
  return rc;
}

static PyObject *resfile_load_classmethod(PyTypeObject *cls, PyObject *args)
{
  const char *filename;
  PyObject *rc = NULL;
  HRESULT hr;
  HRESFILE handle;

  if (!PyArg_ParseTuple(args, "s", &filename))
    return NULL;
  hr = Rsrc_load_file((PCSTR)filename, &handle);
  if (SUCCEEDED(hr))
  {
    rc = wrap_resource_file_handle(handle);
    if (!rc)
    {
      Rsrc_close_file(handle);
      PyErr_SetString(PyExc_RuntimeError, "unable to create new resource file object");
    }
  }
  else
    PyErr_Format(PyExc_RuntimeError, "unable to load resource file '%s' (%08x)", filename, hr);
  return rc;
}

static PyObject *resfile_close(ResFileObject *self, PyObject *args)
{
  if (self->hresfile)
    Rsrc_close_file(self->hresfile);
  self->hresfile = (HRESFILE)NULL;
  return NULL;
}

static PyObject *wrap_resource_handle(HRSRC hrsrc)
{
  PyObject *rc = NULL, *args, *kwargs;
  ResourceObject *pres;

  args = PyTuple_New(0);
  if (args)
  {
    kwargs = PyDict_New();
    if (kwargs)
    {
      rc = PyType_GenericNew(&ResourceType, args, kwargs);
      if (rc)
      {
        pres = (ResourceObject *)rc;
        pres->hrsrc = hrsrc;
      }
      Py_DECREF(kwargs);
    }
    Py_DECREF(args);
  }
  return rc;
}

static PyObject *resfile_find_resource(ResFileObject *self, PyObject *args)
{
  const char *name;
  PyObject *rc = NULL;
  HRSRC hrsrc;
  HRESULT hr;

  if (!PyArg_ParseTuple(args, "s", &name))
    return NULL;
  hr = Rsrc_find_resource(self->hresfile, (PCSTR)name, NULL, &hrsrc);
  if (SUCCEEDED(hr))
  {
    rc = wrap_resource_handle(hrsrc);
    if (!rc)
    {
      Rsrc_free_resource(hrsrc);
      PyErr_SetString(PyExc_RuntimeError, "unable to create new resource object");
    }
  }
  else
    PyErr_Format(PyExc_RuntimeError, "unable to load resource ''%s' (%08x)", name, hr);
  return rc;
}

static PyMethodDef ResFileMethods[] = {
  {"load", (PyCFunction)resfile_load_classmethod, METH_VARARGS|METH_CLASS,
   "Load a resource file."},
  {"close", (PyCFunction)resfile_close, METH_VARARGS,
   "Close the resource file."},
  {"find_resource", (PyCFunction)resfile_find_resource, METH_VARARGS,
   "Find a resource within the resource file."},
  {NULL, NULL, 0, NULL}
};

static void resfile_dealloc(ResFileObject *self)
{
  if (self->hresfile)
    Rsrc_close_file(self->hresfile);
  Py_TYPE(self)->tp_free((PyObject *)self);
}

static int resfile_init(ResFileObject *self, PyObject *args, PyObject *kwds)
{
  self->hresfile = (HRESFILE)NULL;
  return 0;
}

PyTypeObject ResFileType = {
  PyVarObject_HEAD_INIT(NULL, 0)
  .tp_name = "upiwin.ResFile",
  .tp_doc = "Resource file object",
  .tp_basicsize = sizeof(ResFileObject),
  .tp_itemsize = 0,
  .tp_flags = Py_TPFLAGS_DEFAULT,
  .tp_new = PyType_GenericNew,
  .tp_init = (initproc)resfile_init,
  .tp_dealloc = (destructor)resfile_dealloc,
  .tp_methods = ResFileMethods
};

static PyObject *resource_close(ResourceObject *self, PyObject *args)
{
  if (self->hrsrc)
    Rsrc_free_resource(self->hrsrc);
  self->hrsrc = (HRESFILE)NULL;
  return NULL;
}

static PyMethodDef ResourceMethods[] = {
  {"close", (PyCFunction)resource_close, METH_VARARGS,
   "Close and free the resource."},
  {NULL, NULL, 0, NULL}
};

static PyObject *resource_get_size(ResourceObject *self, void *closure)
{
  if (!(self->hrsrc))
  {
    PyErr_SetString(PyExc_RuntimeError, "bad resource object");
    return NULL;
  }
  return PyLong_FromUnsignedLong(Rsrc_sizeof_resource(self->hrsrc));
}

static PyGetSetDef ResourceProperties[] = {
  {"size", (getter)resource_get_size, NULL, "Size of the resource in bytes", NULL},
  {NULL, NULL, NULL, NULL, NULL}
};

static void resource_dealloc(ResourceObject *self)
{
  if (self->hrsrc)
    Rsrc_free_resource(self->hrsrc);
  Py_TYPE(self)->tp_free((PyObject *)self);
}

static int resource_init(ResourceObject *self, PyObject *args, PyObject *kwds)
{
  self->hrsrc = (HRSRC)NULL;
  return 0;
}

PyTypeObject ResourceType = {
  PyVarObject_HEAD_INIT(NULL, 0)
  .tp_name = "upiwin.Resource",
  .tp_doc = "Resource object",
  .tp_basicsize = sizeof(ResourceObject),
  .tp_itemsize = 0,
  .tp_flags = Py_TPFLAGS_DEFAULT,
  .tp_new = PyType_GenericNew,
  .tp_init = (initproc)resource_init,
  .tp_dealloc = (destructor)resource_dealloc,
  .tp_methods = ResourceMethods,
  .tp_getset = ResourceProperties
};

HRESULT Epython_register_resources(PyObject *module)
{
  if (PyType_Ready(&ResFileType) < 0)
	  return E_FAIL;
  if (PyType_Ready(&ResourceType) < 0)
	  return E_FAIL;

  Py_INCREF(&ResFileType);
  if (PyModule_AddObject(module, "ResFile", (PyObject *)(&ResFileType)) < 0)
  {
    Py_DECREF(&ResFileType);
    return E_FAIL;
  }

  Py_INCREF(&ResourceType);
  if (PyModule_AddObject(module, "Resource", (PyObject *)(&ResourceType)) < 0)
  {
    Py_DECREF(&ResourceType);
    return E_FAIL;
  }
  return S_OK;
}