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/* Chrysalide - Outil d'analyse de fichiers binaires
* parser.c - lecteur de contenu Yaml
*
* Copyright (C) 2019-2023 Cyrille Bagard
*
* This file is part of Chrysalide.
*
* Chrysalide 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 of the License, or
* (at your option) any later version.
*
* Chrysalide 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 Chrysalide. If not, see <http://www.gnu.org/licenses/>.
*/
#include "parser.h"
#include <assert.h>
#include <malloc.h>
#include <yaml.h>
#include <gio/gio.h>
#include <analysis/contents/file.h>
#include "collection.h"
#include "pair.h"
#define SCALAR_STYLE_TO_ORIGINAL_STYLE(v) \
({ \
YamlOriginalStyle __result; \
if (v == YAML_SINGLE_QUOTED_SCALAR_STYLE) \
__result = YOS_SINGLE_QUOTED; \
else if (v == YAML_DOUBLE_QUOTED_SCALAR_STYLE) \
__result = YOS_DOUBLE_QUOTED; \
else \
__result = YOS_PLAIN; \
__result; \
})
/* Construit la version GLib d'un noeud YAML brut. */
static GYamlPair *build_pair_from_yaml(yaml_document_t *, int, int);
/* Transforme un noeud YAML brut en sa version Glib. */
static GYamlNode *translate_yaml_node(yaml_document_t *, yaml_node_t *);
/******************************************************************************
* *
* Paramètres : document = gestionnaire de l'ensemble des noeuds bruts. *
* key = indice de la clef du noeud à convertir. *
* value = indice de la valeur du noeud à convertir. *
* *
* Description : Construit la version GLib d'un noeud YAML brut. *
* *
* Retour : Noeud GLib obtenu ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GYamlPair *build_pair_from_yaml(yaml_document_t *document, int key, int value)
{
GYamlPair *result; /* Racine à retourner */
yaml_node_t *key_node; /* Noeud brut de la clef */
yaml_node_t *value_node; /* Noeud brut de la valeur */
GYamlNode *children; /* Collection de noeuds YAML */
result = NULL;
key_node = yaml_document_get_node(document, key);
assert(key_node != NULL);
if (key_node->type != YAML_SCALAR_NODE)
goto exit;
value_node = yaml_document_get_node(document, value);
assert(value_node != NULL);
if (value_node->type == YAML_SCALAR_NODE)
result = g_yaml_pair_new((char *)key_node->data.scalar.value,
SCALAR_STYLE_TO_ORIGINAL_STYLE(key_node->data.scalar.style),
(char *)value_node->data.scalar.value,
SCALAR_STYLE_TO_ORIGINAL_STYLE(value_node->data.scalar.style));
else
{
children = translate_yaml_node(document, value_node);
if (children != NULL)
{
result = g_yaml_pair_new((char *)key_node->data.scalar.value,
SCALAR_STYLE_TO_ORIGINAL_STYLE(key_node->data.scalar.style),
NULL, YOS_PLAIN);
g_yaml_pair_set_children(result, G_YAML_COLLEC(children));
}
}
exit:
return result;
}
/******************************************************************************
* *
* Paramètres : document = gestionnaire de l'ensemble des noeuds bruts. *
* node = point de départ des transformations. *
* *
* Description : Transforme un noeud YAML brut en sa version Glib. *
* *
* Retour : Noeud GLib obtenu ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
static GYamlNode *translate_yaml_node(yaml_document_t *document, yaml_node_t *node)
{
GYamlNode *result; /* Racine à retourner */
yaml_node_item_t *index; /* Elément d'une série */
yaml_node_t *item; /* Elément d'une série */
GYamlNode *child; /* Version GLib de l'élément */
yaml_node_pair_t *pair; /* Combinaison clef/valeur */
GYamlPair *sub; /* Sous-noeud à intégrer */
switch (node->type)
{
case YAML_SCALAR_NODE:
result = G_YAML_NODE(g_yaml_pair_new((char *)node->data.scalar.value,
SCALAR_STYLE_TO_ORIGINAL_STYLE(node->data.scalar.style),
NULL, YOS_PLAIN));
break;
case YAML_SEQUENCE_NODE:
result = G_YAML_NODE(g_yaml_collection_new(true));
for (index = node->data.sequence.items.start; index < node->data.sequence.items.top; index++)
{
item = yaml_document_get_node(document, *index);
assert(item != NULL);
child = translate_yaml_node(document, item);
if (child == NULL)
{
g_clear_object(&result);
break;
}
g_yaml_collection_add_node(G_YAML_COLLEC(result), child);
}
break;
case YAML_MAPPING_NODE:
result = G_YAML_NODE(g_yaml_collection_new(false));
for (pair = node->data.mapping.pairs.start; pair < node->data.mapping.pairs.top; pair++)
{
sub = build_pair_from_yaml(document, pair->key, pair->value);
if (sub == NULL)
{
g_clear_object(&result);
break;
}
g_yaml_collection_add_node(G_YAML_COLLEC(result), G_YAML_NODE(sub));
}
break;
default:
assert(false);
result = NULL;
break;
}
return result;
}
/******************************************************************************
* *
* Paramètres : text = définitions textuelles d'un contenu brut. *
* len = taille de ces définitions. *
* *
* Description : Crée une arborescence YAML pour contenu au format adapté. *
* *
* Retour : Arborescence YAML mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
GYamlNode *parse_yaml_from_text(const char *text, size_t len)
{
GYamlNode *result; /* Racine à retourner */
yaml_parser_t parser; /* Lecteur du contenu fourni */
yaml_document_t document; /* Document YAML constitué */
int ret; /* Bilan de la constitution */
yaml_node_t *root; /* Elément racine brut */
result = NULL;
yaml_parser_initialize(&parser);
yaml_parser_set_input_string(&parser, (const unsigned char *)text, len);
ret = yaml_parser_load(&parser, &document);
if (ret != 1) goto bad_loading;
root = yaml_document_get_root_node(&document);
if (root != NULL)
result = translate_yaml_node(&document, root);
yaml_document_delete(&document);
bad_loading:
yaml_parser_delete(&parser);
return result;
}
/******************************************************************************
* *
* Paramètres : filename = chemin vers des définitions de règles. *
* *
* Description : Crée une arborescence YAML pour fichier au format adapté. *
* *
* Retour : Arborescence YAML mise en place ou NULL en cas d'échec. *
* *
* Remarques : - *
* *
******************************************************************************/
GYamlNode *parse_yaml_from_file(const char *filename)
{
GYamlNode *result; /* Racine à retourner */
GBinContent *content; /* Fichier à parcourir */
phys_t size; /* Taille du contenu associé */
vmpa2t start; /* Tête de lecture */
const bin_t *data; /* Données à consulter */
char *dumped; /* Contenu manipulable */
result = NULL;
content = g_file_content_new(filename);
if (content == NULL) goto no_content;
size = g_binary_content_compute_size(content);
g_binary_content_compute_start_pos(content, &start);
data = g_binary_content_get_raw_access(content, &start, size);
dumped = malloc((size + 1) * sizeof(char));
memcpy(dumped, data, size);
dumped[size] = '\0';
result = parse_yaml_from_text(dumped, size);
free(dumped);
g_object_unref(G_OBJECT(content));
no_content:
return result;
}
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