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/*
* Copyright 2022 Frederico de Oliveira Linhares
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include "loader.h"
void
LoaderStack_constructor(LoaderStack *self, void *obj)
{
self->_last_loaded = 0;
self->_loader_capacity = 10; // Totally arbitrary value.
self->_loader_size = 0;
self->_obj = obj;
self->error_message = NULL;
self->_loaders = malloc(sizeof(Loader) * self->_loader_capacity);
}
void
LoaderStack_destructor(LoaderStack *self)
{
if(self->error_message != NULL)
free(self->error_message);
if(LoaderStack_is_loaded(self)) LoaderStack_unload(self);
free(self->_loaders);
}
static void
LoaderStack_partial_unload(LoaderStack *self, int32_t step)
{
// Already unloaded, nothing to do.
if(self->_last_loaded <= step) return;
for(; self->_last_loaded >= step; self->_last_loaded--)
if(self->_loaders[self->_last_loaded].unload != NULL)
self->_loaders[self->_last_loaded].unload(self->_obj, self);
// This number will be one before the last loaded after the unloading loop
// is over.
self->_last_loaded++;
}
SDL_bool
LoaderStack_partial_load(LoaderStack *self, int32_t step)
{
SDL_bool error = SDL_FALSE;
// Already loaded, nothing to do.
if(self->_last_loaded >= step) return SDL_TRUE;
for(;self->_last_loaded < step; self->_last_loaded++)
{
error = !self->_loaders[self->_last_loaded].load(self->_obj, self);
if(error) break;
}
// Self number will be one after the last loeaded after the loading loop is
// over.
self->_last_loaded--;
if(error) LoaderStack_partial_unload(self, 0);
return !error;
}
SDL_bool
LoaderStack_is_loaded(LoaderStack *self)
{
return self->_last_loaded > 0;
}
void
LoaderStack_add(
LoaderStack *self,
SDL_bool (*load)(void *obj, LoaderStack *ls),
void (*unload)(void *obj, LoaderStack *ls))
{
Loader *l;
uint32_t next_loader = self->_loader_size;
// Expand if is full.
if(self->_loader_size == self->_loader_capacity)
{
self->_loader_capacity += 5; // Totally arbitrary value.
self->_loaders = realloc(self->_loaders,
sizeof(Loader) * self->_loader_capacity);
}
l = &(self->_loaders[next_loader]);
l->load = load;
l->unload = unload;
self->_loader_size++;
}
void
LoaderStack_set_error(
LoaderStack *self, const char* base_error, const char* additional_error)
{
if(self->error_message != NULL) free(self->error_message);
if(additional_error != NULL)
{
self->error_message =
malloc(strlen(base_error) + strlen(additional_error) + 1);
strcpy(self->error_message, base_error);
strcat(self->error_message, additional_error);
}
else
{
self->error_message = malloc(strlen(base_error));
strcpy(self->error_message, base_error);
}
}
SDL_bool
LoaderStack_load(LoaderStack *self)
{
if(LoaderStack_is_loaded(self)) return SDL_TRUE;
if(LoaderStack_partial_load(self, self->_loader_size))
return SDL_TRUE;
else
return SDL_FALSE;
}
SDL_bool
LoaderStack_reload(LoaderStack *self)
{
if(!LoaderStack_is_loaded(self)) return SDL_FALSE;
LoaderStack_partial_unload(self, self->_loader_size);
return LoaderStack_partial_load(self, self->_loader_size);
}
void
LoaderStack_unload(LoaderStack *self)
{
if(!LoaderStack_is_loaded(self)) return;
LoaderStack_partial_unload(self, 0);
}
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