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/*
* This file is part of GNUnet.
* Copyright (C) 2013 GNUnet e.V.
*
* GNUnet 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 3, or (at your
* option) any later version.
*
* GNUnet 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 GNUnet; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* @author Gabor X Toth
*
* @file
* Library providing operations for the @e environment of
* PSYC and Social messages.
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_psyc_env.h"
/**
* Environment for a message.
*
* Contains modifiers.
*/
struct GNUNET_PSYC_Environment
{
struct GNUNET_PSYC_Modifier *mod_head;
struct GNUNET_PSYC_Modifier *mod_tail;
size_t mod_count;
};
/**
* Create an environment.
*
* @return A newly allocated environment.
*/
struct GNUNET_PSYC_Environment *
GNUNET_PSYC_env_create ()
{
return GNUNET_new (struct GNUNET_PSYC_Environment);
}
/**
* Add a modifier to the environment.
*
* @param env The environment.
* @param oper Operation to perform.
* @param name Name of the variable.
* @param value Value of the variable.
* @param value_size Size of @a value.
*/
void
GNUNET_PSYC_env_add (struct GNUNET_PSYC_Environment *env,
enum GNUNET_PSYC_Operator oper, const char *name,
const void *value, size_t value_size)
{
struct GNUNET_PSYC_Modifier *mod = GNUNET_new (struct GNUNET_PSYC_Modifier);
mod->oper = oper;
mod->name = name;
mod->value = value;
mod->value_size = value_size;
GNUNET_CONTAINER_DLL_insert_tail (env->mod_head, env->mod_tail, mod);
env->mod_count++;
}
/**
* Get the first modifier of the environment.
*/
struct GNUNET_PSYC_Modifier *
GNUNET_PSYC_env_head (const struct GNUNET_PSYC_Environment *env)
{
return env->mod_head;
}
/**
* Get the last modifier of the environment.
*/
struct GNUNET_PSYC_Modifier *
GNUNET_PSYC_env_tail (const struct GNUNET_PSYC_Environment *env)
{
return env->mod_tail;
}
/**
* Remove a modifier from the environment.
*/
void
GNUNET_PSYC_env_remove (struct GNUNET_PSYC_Environment *env,
struct GNUNET_PSYC_Modifier *mod)
{
GNUNET_CONTAINER_DLL_remove (env->mod_head, env->mod_tail, mod);
}
/**
* Get the modifier at the beginning of an environment and remove it.
*
* @param env
* @param oper
* @param name
* @param value
* @param value_size
*
* @return
*/
int
GNUNET_PSYC_env_shift (struct GNUNET_PSYC_Environment *env,
enum GNUNET_PSYC_Operator *oper, const char **name,
const void **value, size_t *value_size)
{
if (NULL == env->mod_head)
return GNUNET_NO;
struct GNUNET_PSYC_Modifier *mod = env->mod_head;
*oper = mod->oper;
*name = mod->name;
*value = mod->value;
*value_size = mod->value_size;
GNUNET_CONTAINER_DLL_remove (env->mod_head, env->mod_tail, mod);
GNUNET_free (mod);
env->mod_count--;
return GNUNET_YES;
}
/**
* Iterate through all modifiers in the environment.
*
* @param env The environment.
* @param it Iterator.
* @param it_cls Closure for iterator.
*/
void
GNUNET_PSYC_env_iterate (const struct GNUNET_PSYC_Environment *env,
GNUNET_PSYC_Iterator it, void *it_cls)
{
struct GNUNET_PSYC_Modifier *mod;
for (mod = env->mod_head; NULL != mod; mod = mod->next)
it (it_cls, mod->oper, mod->name, mod->value, mod->value_size);
}
/**
* Get the number of modifiers in the environment.
*
* @param env The environment.
*
* @return Number of modifiers.
*/
size_t
GNUNET_PSYC_env_get_count (const struct GNUNET_PSYC_Environment *env)
{
return env->mod_count;
}
/**
* Destroy an environment.
*
* @param env The environment to destroy.
*/
void
GNUNET_PSYC_env_destroy (struct GNUNET_PSYC_Environment *env)
{
struct GNUNET_PSYC_Modifier *mod, *prev = NULL;
for (mod = env->mod_head; NULL != mod; mod = mod->next)
{
if (NULL != prev)
GNUNET_free (prev);
prev = mod;
}
if (NULL != prev)
GNUNET_free (prev);
GNUNET_free (env);
}
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