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/**
@file rexmpp_xml_parser.c
@brief XML parsing for rexmpp
@author defanor <defanor@uberspace.net>
@date 2023
@copyright MIT license.
*/
#include <string.h>
#include "rexmpp.h"
#include "rexmpp_xml.h"
#include "rexmpp_xml_parser.h"
#include "config.h"
#if defined(USE_LIBXML2)
void rexmpp_xml_sax_characters (rexmpp_xml_parser_ctx_t ctx,
const char *ch,
int len)
{
ctx->handlers->text(ctx->user_data, ch, len);
}
void rexmpp_xml_sax_elem_start (rexmpp_xml_parser_ctx_t ctx,
const char *localname,
const char *prefix,
const char *URI,
int nb_namespaces,
const char **namespaces,
int nb_attributes,
int nb_defaulted,
const char **attributes)
{
(void)prefix;
(void)nb_namespaces;
(void)namespaces;
(void)nb_defaulted;
rexmpp_xml_attr_t *attrs = NULL;
int i;
for (i = nb_attributes - 1; i >= 0; i--) {
size_t attr_len = attributes[i * 5 + 4] - attributes[i * 5 + 3];
char *attr_val = malloc(attr_len + 1);
if (attr_val != NULL) {
attr_val[attr_len] = '\0';
strncpy(attr_val, attributes[i * 5 + 3], attr_len);
rexmpp_xml_attr_t *attr =
rexmpp_xml_attr_new(attributes[i * 5], NULL, attr_val);
free(attr_val);
attr->next = attrs;
attrs = attr;
}
}
ctx->handlers->elem_start(ctx->user_data, localname, URI, attrs);
}
void rexmpp_xml_sax_elem_end (rexmpp_xml_parser_ctx_t ctx,
const char *localname,
const char *prefix,
const char *URI)
{
(void)localname;
(void)prefix;
(void)URI;
ctx->handlers->elem_end(ctx->user_data);
}
xmlSAXHandler rexmpp_xml_parser_sax = {
.initialized = XML_SAX2_MAGIC,
.characters = (charactersSAXFunc)rexmpp_xml_sax_characters,
.startElementNs = (startElementNsSAX2Func)rexmpp_xml_sax_elem_start,
.endElementNs = (endElementNsSAX2Func)rexmpp_xml_sax_elem_end,
};
/* rexmpp_xml_t *rexmpp_xml_from_libxml2 (xmlNodePtr from) { */
/* if (from == NULL) { */
/* return NULL; */
/* } */
/* rexmpp_xml_t *to = NULL; */
/* if (from->type == XML_ELEMENT_NODE) { */
/* to = malloc(sizeof(rexmpp_xml_t)); */
/* /\* Type *\/ */
/* to->type = REXMPP_XML_ELEMENT; */
/* /\* Name and namespace *\/ */
/* to->alt.elem.qname.name = strdup(from->name); */
/* if (from->nsDef != NULL && from->nsDef->href != NULL) { */
/* to->alt.elem.qname.namespace = strdup(from->nsDef->href); */
/* } else { */
/* to->alt.elem.qname.namespace = NULL; */
/* } */
/* /\* Attributes *\/ */
/* to->alt.elem.attributes = NULL; */
/* struct _xmlAttr *from_attr; */
/* rexmpp_xml_attr_t **to_next_attr = &(to->alt.elem.attributes); */
/* for (from_attr = from->properties; */
/* from_attr != NULL; */
/* from_attr = from_attr->next) */
/* { */
/* rexmpp_xml_attr_t *to_attr = */
/* malloc(sizeof(rexmpp_xml_attr_t)); */
/* to_attr->qname.name = strdup(from_attr->name); */
/* to_attr->qname.namespace = NULL; */
/* if (from_attr->ns != NULL && from_attr->ns->href != NULL) { */
/* to_attr->qname.namespace = strdup(from_attr->ns->href); */
/* to_attr->value = */
/* xmlGetNsProp(from, to_attr->qname.name, to_attr->qname.namespace); */
/* } else { */
/* to_attr->value = xmlGetProp(from, to_attr->qname.name); */
/* } */
/* to_attr->next = NULL; */
/* *to_next_attr = to_attr; */
/* to_next_attr = &(to_attr->next); */
/* } */
/* /\* Children *\/ */
/* to->alt.elem.children = NULL; */
/* xmlNodePtr from_child; */
/* rexmpp_xml_t **to_next_child = &(to->alt.elem.children); */
/* for (from_child = from->children; */
/* from_child != NULL; */
/* from_child = from_child->next) */
/* { */
/* rexmpp_xml_t *next_child = rexmpp_xml_from_libxml2(from_child); */
/* if (next_child != NULL) { */
/* *to_next_child = next_child; */
/* to_next_child = &(next_child->next); */
/* } */
/* } */
/* /\* Next *\/ */
/* to->next = NULL; */
/* } else if (from->type == XML_TEXT_NODE) { */
/* to = malloc(sizeof(rexmpp_xml_t)); */
/* to->type = REXMPP_XML_TEXT; */
/* to->alt.text = xmlNodeGetContent(from); */
/* to->next = NULL; */
/* } */
/* return to; */
/* } */
/* rexmpp_xml_t *rexmpp_xml_from_libxml2_list (xmlNodePtr from) { */
/* if (from == NULL) { */
/* return NULL; */
/* } */
/* rexmpp_xml_t *to = rexmpp_xml_from_libxml2(from); */
/* if (from->next != NULL) { */
/* to->next = rexmpp_xml_from_libxml2_list(from->next); */
/* } */
/* return to; */
/* } */
/* xmlNodePtr rexmpp_xml_to_libxml2 (rexmpp_xml_t *from) { */
/* if (from == NULL) { */
/* return NULL; */
/* } */
/* if (from->type == REXMPP_XML_TEXT) { */
/* xmlNodePtr to = xmlNewText(from->alt.text); */
/* to->next = rexmpp_xml_to_libxml2(from->next); */
/* return to; */
/* } */
/* /\* Name and namespace *\/ */
/* xmlNodePtr to = xmlNewNode(NULL, from->alt.elem.qname.name); */
/* if (from->alt.elem.qname.namespace != NULL) { */
/* xmlNewNs(to, from->alt.elem.qname.namespace, NULL); */
/* } */
/* /\* Attributes *\/ */
/* rexmpp_xml_attr_t *attr = from->alt.elem.attributes; */
/* while (attr != NULL) { */
/* /\* TODO: Would be nice to take namespaces into account, though */
/* they are currently not used for attributes. *\/ */
/* xmlNewProp(to, attr->qname.name, attr->value); */
/* attr = attr->next; */
/* } */
/* /\* Children *\/ */
/* rexmpp_xml_t *child = from->alt.elem.children; */
/* while (child != NULL) { */
/* xmlAddChild(to, rexmpp_xml_to_libxml2(child)); */
/* child = child->next; */
/* } */
/* return to; */
/* } */
/* xmlNodePtr rexmpp_xml_to_libxml2_list (rexmpp_xml_t *from) { */
/* xmlNodePtr to = rexmpp_xml_to_libxml2(from); */
/* if (from->next != NULL) { */
/* xmlAddNextSibling(to, rexmpp_xml_to_libxml2_list(from->next)); */
/* } */
/* return to; */
/* } */
#elif defined(USE_EXPAT)
void XMLCALL
rexmpp_xml_sax_elem_start (rexmpp_xml_parser_ctx_t ctx,
const char *el,
const char **attributes)
{
char *buf = strdup(el);
char *name = NULL, *namespace = buf;
size_t i;
for (i = 0; i < strlen(namespace); i++) {
if (namespace[i] == '\xff') {
name = namespace + i + 1;
namespace[i] = '\0';
}
}
if (name == NULL) {
name = namespace;
namespace = NULL;
}
rexmpp_xml_attr_t *attrs = NULL;
for (i = 0; attributes[i] != NULL; i += 2) {
rexmpp_xml_attr_t *attr =
rexmpp_xml_attr_new(attributes[i], NULL, attributes[i + 1]);
attr->next = attrs;
attrs = attr;
}
ctx->handlers->elem_start(ctx->user_data, name, namespace, attrs);
free(buf);
}
void XMLCALL
rexmpp_xml_sax_elem_end(rexmpp_xml_parser_ctx_t ctx,
const XML_Char *name)
{
(void)name;
ctx->handlers->elem_end(ctx->user_data);
}
void XMLCALL
rexmpp_xml_sax_characters (rexmpp_xml_parser_ctx_t ctx,
const XML_Char *ch,
int len)
{
ctx->handlers->text(ctx->user_data, ch, len);
}
#endif
rexmpp_xml_parser_ctx_t
rexmpp_xml_parser_new (rexmpp_xml_parser_handlers_t handlers,
void *data)
{
rexmpp_xml_parser_ctx_t ctx = malloc(sizeof(struct rexmpp_xml_parser_ctx));
if (ctx == NULL) {
return NULL;
}
#if defined(USE_LIBXML2)
xmlParserCtxtPtr p =
xmlCreatePushParserCtxt(&rexmpp_xml_parser_sax, ctx, "", 0, NULL);
#elif defined(USE_EXPAT)
XML_Parser p = XML_ParserCreateNS("utf-8", '\xff');
XML_SetUserData(p, ctx);
XML_SetStartElementHandler(p, (XML_StartElementHandler)
rexmpp_xml_sax_elem_start);
XML_SetEndElementHandler(p, (XML_EndElementHandler)
rexmpp_xml_sax_elem_end);
XML_SetCharacterDataHandler(p, (XML_CharacterDataHandler)
rexmpp_xml_sax_characters);
#endif
if (p == NULL) {
free(ctx);
return NULL;
}
ctx->xml_parser = p;
ctx->handlers = handlers;
ctx->user_data = data;
return ctx;
}
void rexmpp_xml_parser_free (rexmpp_xml_parser_ctx_t ctx) {
#if defined(USE_LIBXML2)
xmlFreeParserCtxt(ctx->xml_parser);
#elif defined(USE_EXPAT)
XML_ParserFree(ctx->xml_parser);
#endif
free(ctx);
}
rexmpp_xml_parser_ctx_t rexmpp_xml_parser_reset (rexmpp_xml_parser_ctx_t ctx) {
#if defined(USE_LIBXML2)
xmlCtxtResetPush(ctx->xml_parser, "", 0, "", "utf-8");
#elif defined(USE_EXPAT)
XML_ParserReset(ctx->xml_parser, "utf-8");
XML_SetUserData(ctx->xml_parser, ctx);
XML_SetStartElementHandler(ctx->xml_parser, (XML_StartElementHandler)
rexmpp_xml_sax_elem_start);
XML_SetEndElementHandler(ctx->xml_parser, (XML_EndElementHandler)
rexmpp_xml_sax_elem_end);
XML_SetCharacterDataHandler(ctx->xml_parser, (XML_CharacterDataHandler)
rexmpp_xml_sax_characters);
#endif
return ctx;
}
void
rexmpp_xml_parser_feed (rexmpp_xml_parser_ctx_t ctx,
const char *chunk,
size_t len,
int final)
{
#if defined(USE_LIBXML2)
xmlParseChunk(ctx->xml_parser, chunk, len, final);
#elif defined(USE_EXPAT)
XML_Parse(ctx->xml_parser, chunk, len, final);
#endif
}
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