2020-10-04 05:44:43 -04:00
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/* Icecast
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*
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* This program is distributed under the GNU General Public License, version 2.
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* A copy of this license is included with this source.
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*
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* Copyright 2018-2020, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
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*/
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/**
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* This file contains functions for rendering XML as JSON.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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2020-10-04 11:51:29 -04:00
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#include <string.h>
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2020-10-07 12:43:58 -04:00
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#include <stdlib.h>
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2020-10-04 11:51:29 -04:00
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2020-10-04 05:44:43 -04:00
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#include "xml2json.h"
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#include "json.h"
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2020-10-07 07:56:58 -04:00
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/* For XMLSTR() */
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#include "cfgfile.h"
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2020-10-04 05:44:43 -04:00
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#include "logging.h"
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#define CATMODULE "xml2json"
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2020-10-04 11:30:50 -04:00
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2020-10-04 11:51:29 -04:00
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struct xml2json_cache {
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const char *default_namespace;
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2020-10-04 11:51:29 -04:00
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xmlNsPtr ns;
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void (*render)(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache);
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};
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2020-10-07 12:43:01 -04:00
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struct nodelist {
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xmlNodePtr *nodes;
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size_t len;
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size_t fill;
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};
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2020-10-04 11:51:29 -04:00
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static void render_node(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache);
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2020-10-07 07:56:58 -04:00
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static void render_node_generic(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache);
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2020-10-07 12:43:58 -04:00
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static void nodelist_init(struct nodelist *list)
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{
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memset(list, 0, sizeof(*list));
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}
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static void nodelist_free(struct nodelist *list)
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{
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free(list->nodes);
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memset(list, 0, sizeof(*list));
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}
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static void nodelist_push(struct nodelist *list, xmlNodePtr node)
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{
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if (list->fill == list->len) {
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xmlNodePtr *n = realloc(list->nodes, sizeof(xmlNodePtr)*(list->len + 16));
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if (!n) {
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ICECAST_LOG_ERROR("Can not allocate memory for node list. BAD.");
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return;
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}
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list->nodes = n;
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list->len += 16;
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}
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list->nodes[list->fill++] = node;
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}
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static xmlNodePtr nodelist_get(struct nodelist *list, size_t idx)
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{
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if (idx >= list->fill)
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return NULL;
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return list->nodes[idx];
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}
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static void nodelist_unset(struct nodelist *list, size_t idx)
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{
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if (idx >= list->fill)
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return;
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list->nodes[idx] = NULL;
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}
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static size_t nodelist_fill(struct nodelist *list)
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{
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return list->fill;
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}
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static int nodelist_is_empty(struct nodelist *list)
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{
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size_t i;
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for (i = 0; i < list->fill; i++)
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if (list->nodes[i])
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return 0;
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return 1;
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}
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2020-10-07 12:43:01 -04:00
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static void handle_textchildnode(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache)
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{
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xmlChar *value = xmlNodeListGetString(doc, node->xmlChildrenNode, 1);
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if (value) {
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json_renderer_write_key(renderer, (const char *)node->name, JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char*)value, JSON_RENDERER_FLAGS_NONE);
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xmlFree(value);
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}
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}
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static int handle_node_modules(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache)
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{
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if (node->type == XML_ELEMENT_NODE && strcmp((const char *)node->name, "modules") == 0) {
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_OBJECT);
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if (node->xmlChildrenNode) {
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xmlNodePtr cur = node->xmlChildrenNode;
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do {
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if (cur->type == XML_ELEMENT_NODE && cur->name && strcmp((const char *)cur->name, "module") == 0) {
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xmlChar *name = xmlGetProp(cur, XMLSTR("name"));
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if (name) {
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json_renderer_write_key(renderer, (const char *)name, JSON_RENDERER_FLAGS_NONE);
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_OBJECT);
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if (node->properties) {
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xmlAttrPtr prop = node->properties;
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do {
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xmlChar *value = xmlNodeListGetString(doc, prop->children, 1);
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if (value) {
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json_renderer_write_key(renderer, (const char*)cur->name, JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char*)value, JSON_RENDERER_FLAGS_NONE);
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xmlFree(value);
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}
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} while ((prop = prop->next));
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}
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json_renderer_end(renderer);
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xmlFree(name);
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}
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} else {
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json_renderer_write_key(renderer, "unhandled-child", JSON_RENDERER_FLAGS_NONE);
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render_node(renderer, doc, cur, node, cache);
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}
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cur = cur->next;
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} while (cur);
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}
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json_renderer_end(renderer);
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return 1;
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}
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return 0;
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}
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2020-10-07 07:56:58 -04:00
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static void render_node_legacyresponse(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache)
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{
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int handled = 0;
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if (node->type == XML_ELEMENT_NODE) {
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const char *nodename = (const char *)node->name;
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handled = 1;
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if (strcmp(nodename, "iceresponse") == 0) {
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_OBJECT);
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if (node->xmlChildrenNode) {
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xmlNodePtr cur = node->xmlChildrenNode;
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do {
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int handled_child = 1;
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if (cur->type == XML_ELEMENT_NODE && cur->name) {
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if (strcmp((const char *)cur->name, "message") == 0) {
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2020-10-07 12:43:01 -04:00
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handle_textchildnode(renderer, doc, cur, node, cache);
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2020-10-07 07:56:58 -04:00
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} else if (strcmp((const char *)cur->name, "return") == 0) {
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xmlChar *value = xmlNodeListGetString(doc, cur->xmlChildrenNode, 1);
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if (value) {
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json_renderer_write_key(renderer, "success", JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_boolean(renderer, strcmp((const char *)value, "1") == 0);
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xmlFree(value);
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}
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} else if (strcmp((const char *)cur->name, "modules") == 0) {
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json_renderer_write_key(renderer, "modules", JSON_RENDERER_FLAGS_NONE);
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render_node(renderer, doc, cur, node, cache);
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} else {
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handled_child = 0;
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}
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} else {
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handled_child = 0;
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}
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if (!handled_child) {
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json_renderer_write_key(renderer, "unhandled-child", JSON_RENDERER_FLAGS_NONE);
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render_node(renderer, doc, cur, node, cache);
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}
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cur = cur->next;
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} while (cur);
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}
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json_renderer_end(renderer);
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} else if (strcmp(nodename, "modules") == 0) {
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2020-10-07 12:43:01 -04:00
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handled = handle_node_modules(renderer, doc, node, parent, cache);
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2020-10-07 07:56:58 -04:00
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} else {
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handled = 0;
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}
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}
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if (!handled)
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render_node_generic(renderer, doc, node, parent, cache);
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}
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2020-10-04 11:51:29 -04:00
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static void render_node_generic(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache)
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2020-10-04 11:30:50 -04:00
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{
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_OBJECT);
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json_renderer_write_key(renderer, "type", JSON_RENDERER_FLAGS_NONE);
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switch (node->type) {
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case XML_ELEMENT_NODE:
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json_renderer_write_string(renderer, "element", JSON_RENDERER_FLAGS_NONE);
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if (node->name) {
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json_renderer_write_key(renderer, "name", JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char *)node->name, JSON_RENDERER_FLAGS_NONE);
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}
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break;
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case XML_TEXT_NODE:
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json_renderer_write_string(renderer, "text", JSON_RENDERER_FLAGS_NONE);
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break;
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case XML_COMMENT_NODE:
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json_renderer_write_string(renderer, "comment", JSON_RENDERER_FLAGS_NONE);
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break;
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default:
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json_renderer_write_null(renderer);
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break;
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}
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if (node->content) {
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json_renderer_write_key(renderer, "text", JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char *)node->content, JSON_RENDERER_FLAGS_NONE);
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}
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json_renderer_write_key(renderer, "ns", JSON_RENDERER_FLAGS_NONE);
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if (node->ns && node->ns->href) {
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json_renderer_write_string(renderer, (const char *)node->ns->href, JSON_RENDERER_FLAGS_NONE);
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if (node->ns->prefix) {
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json_renderer_write_key(renderer, "nsprefix", JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char *)node->ns->prefix, JSON_RENDERER_FLAGS_NONE);
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}
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} else {
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json_renderer_write_null(renderer);
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}
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if (node->properties) {
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xmlAttrPtr cur = node->properties;
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json_renderer_write_key(renderer, "properties", JSON_RENDERER_FLAGS_NONE);
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_OBJECT);
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do {
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xmlChar *value = xmlNodeListGetString(doc, cur->children, 1);
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if (value) {
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json_renderer_write_key(renderer, (const char*)cur->name, JSON_RENDERER_FLAGS_NONE);
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json_renderer_write_string(renderer, (const char*)value, JSON_RENDERER_FLAGS_NONE);
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xmlFree(value);
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}
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} while ((cur = cur->next));
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json_renderer_end(renderer);
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}
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if (node->xmlChildrenNode) {
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xmlNodePtr cur = node->xmlChildrenNode;
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json_renderer_write_key(renderer, "children", JSON_RENDERER_FLAGS_NONE);
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json_renderer_begin(renderer, JSON_ELEMENT_TYPE_ARRAY);
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do {
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2020-10-04 11:51:29 -04:00
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render_node(renderer, doc, cur, node, cache);
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2020-10-04 11:30:50 -04:00
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cur = cur->next;
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} while (cur);
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json_renderer_end(renderer);
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}
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json_renderer_end(renderer);
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}
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2020-10-04 11:51:29 -04:00
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static void render_node(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache)
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{
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void (*render)(json_renderer_t *renderer, xmlDocPtr doc, xmlNodePtr node, xmlNodePtr parent, struct xml2json_cache *cache) = NULL;
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if (node->ns == cache->ns)
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render = cache->render;
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if (render == NULL) {
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2020-10-06 17:00:53 -04:00
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const char *href = cache->default_namespace;
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if (node->ns && node->ns->href)
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href = (const char *)node->ns->href;
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2020-10-04 11:51:29 -04:00
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2020-10-06 17:00:53 -04:00
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if (href) {
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2020-10-07 07:56:58 -04:00
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if (strcmp(href, "http://icecast.org/specs/legacyresponse-0.0.1") == 0) {
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render = render_node_legacyresponse;
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}
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2020-10-04 11:51:29 -04:00
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}
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2020-10-06 17:00:53 -04:00
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if (render == NULL)
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render = render_node_generic;
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cache->ns = node->ns;
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cache->render = render;
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}
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2020-10-04 11:51:29 -04:00
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render(renderer, doc, node, parent, cache);
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}
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2020-10-04 16:37:16 -04:00
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char * xml2json_render_doc_simple(xmlDocPtr doc, const char *default_namespace)
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2020-10-04 11:30:50 -04:00
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{
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2020-10-04 11:51:29 -04:00
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struct xml2json_cache cache;
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2020-10-04 11:30:50 -04:00
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json_renderer_t *renderer;
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xmlNodePtr xmlroot;
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if (!doc)
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return NULL;
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renderer = json_renderer_create(JSON_RENDERER_FLAGS_NONE);
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if (!renderer)
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return NULL;
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xmlroot = xmlDocGetRootElement(doc);
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if (!xmlroot)
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return NULL;
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2020-10-04 11:51:29 -04:00
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memset(&cache, 0, sizeof(cache));
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2020-10-06 17:00:53 -04:00
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cache.default_namespace = default_namespace;
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2020-10-04 11:51:29 -04:00
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render_node(renderer, doc, xmlroot, NULL, &cache);
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2020-10-04 11:30:50 -04:00
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return json_renderer_finish(&renderer);
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}
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