sax2.c

xml开源解析代码.版本为libxml2-2.6.29,可支持GB3212.网络消息发送XML时很有用.

 * xmlSAX2StartDocument:
 * @ctx: the user data (XML parser context)
 *
 * called when the document start being processed.
 */
void
xmlSAX2StartDocument(void *ctx)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlDocPtr doc;

    if (ctx == NULL) return;

#ifdef DEBUG_SAX
    xmlGenericError(xmlGenericErrorContext,
	    "SAX.xmlSAX2StartDocument()\n");
#endif
    if (ctxt->html) {
#ifdef LIBXML_HTML_ENABLED
	if (ctxt->myDoc == NULL)
	    ctxt->myDoc = htmlNewDocNoDtD(NULL, NULL);
	if (ctxt->myDoc == NULL) {
	    xmlSAX2ErrMemory(ctxt, "xmlSAX2StartDocument");
	    return;
	}
#else
        xmlGenericError(xmlGenericErrorContext,
		"libxml2 built without HTML support\n");
	ctxt->errNo = XML_ERR_INTERNAL_ERROR;
	ctxt->instate = XML_PARSER_EOF;
	ctxt->disableSAX = 1;
	return;
#endif
    } else {
	doc = ctxt->myDoc = xmlNewDoc(ctxt->version);
	if (doc != NULL) {
	    if (ctxt->encoding != NULL)
		doc->encoding = xmlStrdup(ctxt->encoding);
	    else
		doc->encoding = NULL;
	    doc->standalone = ctxt->standalone;
	} else {
	    xmlSAX2ErrMemory(ctxt, "xmlSAX2StartDocument");
	    return;
	}
	if ((ctxt->dictNames) && (doc != NULL)) {
	    doc->dict = ctxt->dict;
	    xmlDictReference(doc->dict);
	}
    }
    if ((ctxt->myDoc != NULL) && (ctxt->myDoc->URL == NULL) &&
	(ctxt->input != NULL) && (ctxt->input->filename != NULL)) {
	ctxt->myDoc->URL = xmlPathToURI((const xmlChar *)ctxt->input->filename);
	if (ctxt->myDoc->URL == NULL)
	    xmlSAX2ErrMemory(ctxt, "xmlSAX2StartDocument");
    }
}

/**
 * xmlSAX2EndDocument:
 * @ctx: the user data (XML parser context)
 *
 * called when the document end has been detected.
 */
void
xmlSAX2EndDocument(void *ctx)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
#ifdef DEBUG_SAX
    xmlGenericError(xmlGenericErrorContext,
	    "SAX.xmlSAX2EndDocument()\n");
#endif
    if (ctx == NULL) return;
#ifdef LIBXML_VALID_ENABLED
    if (ctxt->validate && ctxt->wellFormed &&
        ctxt->myDoc && ctxt->myDoc->intSubset)
	ctxt->valid &= xmlValidateDocumentFinal(&ctxt->vctxt, ctxt->myDoc);
#endif /* LIBXML_VALID_ENABLED */

    /*
     * Grab the encoding if it was added on-the-fly
     */
    if ((ctxt->encoding != NULL) && (ctxt->myDoc != NULL) &&
	(ctxt->myDoc->encoding == NULL)) {
	ctxt->myDoc->encoding = ctxt->encoding;
	ctxt->encoding = NULL;
    }
    if ((ctxt->inputTab != NULL) &&
        (ctxt->inputNr > 0) && (ctxt->inputTab[0] != NULL) &&
        (ctxt->inputTab[0]->encoding != NULL) && (ctxt->myDoc != NULL) &&
	(ctxt->myDoc->encoding == NULL)) {
	ctxt->myDoc->encoding = xmlStrdup(ctxt->inputTab[0]->encoding);
    }
    if ((ctxt->charset != XML_CHAR_ENCODING_NONE) && (ctxt->myDoc != NULL) &&
	(ctxt->myDoc->charset == XML_CHAR_ENCODING_NONE)) {
	ctxt->myDoc->charset = ctxt->charset;
    }
}

#if defined(LIBXML_SAX1_ENABLED) || defined(LIBXML_HTML_ENABLED) || defined(LIBXML_WRITER_ENABLED) || defined(LIBXML_DOCB_ENABLED)
/**
 * xmlSAX2AttributeInternal:
 * @ctx: the user data (XML parser context)
 * @fullname:  The attribute name, including namespace prefix
 * @value:  The attribute value
 * @prefix: the prefix on the element node
 *
 * Handle an attribute that has been read by the parser.
 * The default handling is to convert the attribute into an
 * DOM subtree and past it in a new xmlAttr element added to
 * the element.
 */
static void
xmlSAX2AttributeInternal(void *ctx, const xmlChar *fullname,
             const xmlChar *value, const xmlChar *prefix ATTRIBUTE_UNUSED)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlAttrPtr ret;
    xmlChar *name;
    xmlChar *ns;
    xmlChar *nval;
    xmlNsPtr namespace;

    if (ctxt->html) {
	name = xmlStrdup(fullname);
	ns = NULL;
	namespace = NULL;
    } else {
	/*
	 * Split the full name into a namespace prefix and the tag name
	 */
	name = xmlSplitQName(ctxt, fullname, &ns);
	if ((name != NULL) && (name[0] == 0)) {
	    if (xmlStrEqual(ns, BAD_CAST "xmlns")) {
		xmlNsErrMsg(ctxt, XML_ERR_NS_DECL_ERROR,
			    "invalid namespace declaration '%s'\n",
			    fullname, NULL);
	    } else {
		xmlNsWarnMsg(ctxt, XML_WAR_NS_COLUMN,
			     "Avoid attribute ending with ':' like '%s'\n",
			     fullname, NULL);
	    }
	    if (ns != NULL)
		xmlFree(ns);
	    ns = NULL;
	    xmlFree(name);
	    name = xmlStrdup(fullname);
	}
    }
    if (name == NULL) {
        xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElement");
	if (ns != NULL)
	    xmlFree(ns);
	return;
    }

#ifdef LIBXML_VALID_ENABLED
    /*
     * Do the last stage of the attribute normalization
     * Needed for HTML too:
     *   http://www.w3.org/TR/html4/types.html#h-6.2
     */
    ctxt->vctxt.valid = 1;
    nval = xmlValidCtxtNormalizeAttributeValue(&ctxt->vctxt,
	                                   ctxt->myDoc, ctxt->node,
					   fullname, value);
    if (ctxt->vctxt.valid != 1) {
	ctxt->valid = 0;
    }
    if (nval != NULL)
	value = nval;
#else
    nval = NULL;
#endif /* LIBXML_VALID_ENABLED */

    /*
     * Check whether it's a namespace definition
     */
    if ((!ctxt->html) && (ns == NULL) &&
        (name[0] == 'x') && (name[1] == 'm') && (name[2] == 'l') &&
        (name[3] == 'n') && (name[4] == 's') && (name[5] == 0)) {
	xmlNsPtr nsret;
	xmlChar *val;

        if (!ctxt->replaceEntities) {
	    ctxt->depth++;
	    val = xmlStringDecodeEntities(ctxt, value, XML_SUBSTITUTE_REF,
		                          0,0,0);
	    ctxt->depth--;
	} else {
	    val = (xmlChar *) value;
	}

	if (val[0] != 0) {
	    xmlURIPtr uri;

	    uri = xmlParseURI((const char *)val);
	    if (uri == NULL) {
		if ((ctxt->sax != NULL) && (ctxt->sax->warning != NULL))
		    ctxt->sax->warning(ctxt->userData, 
			 "xmlns: %s not a valid URI\n", val);
	    } else {
		if (uri->scheme == NULL) {
		    if ((ctxt->sax != NULL) && (ctxt->sax->warning != NULL))
			ctxt->sax->warning(ctxt->userData, 
			     "xmlns: URI %s is not absolute\n", val);
		}
		xmlFreeURI(uri);
	    }
	}

	/* a default namespace definition */
	nsret = xmlNewNs(ctxt->node, val, NULL);

#ifdef LIBXML_VALID_ENABLED
	/*
	 * Validate also for namespace decls, they are attributes from
	 * an XML-1.0 perspective
	 */
        if (nsret != NULL && ctxt->validate && ctxt->wellFormed &&
	    ctxt->myDoc && ctxt->myDoc->intSubset)
	    ctxt->valid &= xmlValidateOneNamespace(&ctxt->vctxt, ctxt->myDoc,
					   ctxt->node, prefix, nsret, val);
#endif /* LIBXML_VALID_ENABLED */
	if (name != NULL) 
	    xmlFree(name);
	if (nval != NULL)
	    xmlFree(nval);
	if (val != value)
	    xmlFree(val);
	return;
    }
    if ((!ctxt->html) &&
	(ns != NULL) && (ns[0] == 'x') && (ns[1] == 'm') && (ns[2] == 'l') &&
        (ns[3] == 'n') && (ns[4] == 's') && (ns[5] == 0)) {
	xmlNsPtr nsret;
	xmlChar *val;

        if (!ctxt->replaceEntities) {
	    ctxt->depth++;
	    val = xmlStringDecodeEntities(ctxt, value, XML_SUBSTITUTE_REF,
		                          0,0,0);
	    ctxt->depth--;
	    if (val == NULL) {
	        xmlSAX2ErrMemory(ctxt, "xmlSAX2StartElement");
	        xmlFree(ns);
		if (name != NULL) 
		    xmlFree(name);
		return;
	    }
	} else {
	    val = (xmlChar *) value;
	}

	if (val[0] == 0) {
	    xmlNsErrMsg(ctxt, XML_NS_ERR_EMPTY,
		        "Empty namespace name for prefix %s\n", name, NULL);
	}
	if ((ctxt->pedantic != 0) && (val[0] != 0)) {
	    xmlURIPtr uri;

	    uri = xmlParseURI((const char *)val);
	    if (uri == NULL) {
	        xmlNsWarnMsg(ctxt, XML_WAR_NS_URI,
			 "xmlns:%s: %s not a valid URI\n", name, value);
	    } else {
		if (uri->scheme == NULL) {
		    xmlNsWarnMsg(ctxt, XML_WAR_NS_URI_RELATIVE,
			   "xmlns:%s: URI %s is not absolute\n", name, value);
		}
		xmlFreeURI(uri);
	    }
	}

	/* a standard namespace definition */
	nsret = xmlNewNs(ctxt->node, val, name);
	xmlFree(ns);
#ifdef LIBXML_VALID_ENABLED
	/*
	 * Validate also for namespace decls, they are attributes from
	 * an XML-1.0 perspective
	 */
        if (nsret != NULL && ctxt->validate && ctxt->wellFormed &&
	    ctxt->myDoc && ctxt->myDoc->intSubset)
	    ctxt->valid &= xmlValidateOneNamespace(&ctxt->vctxt, ctxt->myDoc,
					   ctxt->node, prefix, nsret, value);
#endif /* LIBXML_VALID_ENABLED */
	if (name != NULL) 
	    xmlFree(name);
	if (nval != NULL)
	    xmlFree(nval);
	if (val != value)
	    xmlFree(val);
	return;
    }

    if (ns != NULL) {
	xmlAttrPtr prop;
	namespace = xmlSearchNs(ctxt->myDoc, ctxt->node, ns);
	if (namespace == NULL) {
	    xmlNsErrMsg(ctxt, XML_NS_ERR_UNDEFINED_NAMESPACE,
		    "Namespace prefix %s of attribute %s is not defined\n",
		             ns, name);
	}

	prop = ctxt->node->properties;
	while (prop != NULL) {
	    if (prop->ns != NULL) {
		if ((xmlStrEqual(name, prop->name)) &&
		    ((namespace == prop->ns) ||
		     (xmlStrEqual(namespace->href, prop->ns->href)))) {
			xmlNsErrMsg(ctxt, XML_ERR_ATTRIBUTE_REDEFINED,
			        "Attribute %s in %s redefined\n",
			                 name, namespace->href);
		    ctxt->wellFormed = 0;
		    if (ctxt->recovery == 0) ctxt->disableSAX = 1;
		    goto error;
		}
	    }
	    prop = prop->next;
	}
    } else {
	namespace = NULL;
    }

    /* !!!!!! <a toto:arg="" xmlns:toto="http://toto.com"> */
    ret = xmlNewNsPropEatName(ctxt->node, namespace, name, NULL);

    if (ret != NULL) {
        if ((ctxt->replaceEntities == 0) && (!ctxt->html)) {
	    xmlNodePtr tmp;

	    ret->children = xmlStringGetNodeList(ctxt->myDoc, value);
	    tmp = ret->children;
	    while (tmp != NULL) {
		tmp->parent = (xmlNodePtr) ret;
		if (tmp->next == NULL)
		    ret->last = tmp;
		tmp = tmp->next;
	    }
	} else if (value != NULL) {
	    ret->children = xmlNewDocText(ctxt->myDoc, value);
	    ret->last = ret->children;
	    if (ret->children != NULL)
		ret->children->parent = (xmlNodePtr) ret;
	}
    }

#ifdef LIBXML_VALID_ENABLED
    if ((!ctxt->html) && ctxt->validate && ctxt->wellFormed &&
        ctxt->myDoc && ctxt->myDoc->intSubset) {
	
	/*
	 * If we don't substitute entities, the validation should be
	 * done on a value with replaced entities anyway.
	 */
        if (!ctxt->replaceEntities) {
	    xmlChar *val;

	    ctxt->depth++;
	    val = xmlStringDecodeEntities(ctxt, value, XML_SUBSTITUTE_REF,
		                          0,0,0);
	    ctxt->depth--;
	    
	    if (val == NULL)
		ctxt->valid &= xmlValidateOneAttribute(&ctxt->vctxt,
				ctxt->myDoc, ctxt->node, ret, value);
	    else {
		xmlChar *nvalnorm;

		/*
		 * Do the last stage of the attribute normalization
		 * It need to be done twice ... it's an extra burden related
		 * to the ability to keep xmlSAX2References in attributes
		 */
		nvalnorm = xmlValidNormalizeAttributeValue(ctxt->myDoc,
					    ctxt->node, fullname, val);
		if (nvalnorm != NULL) {
		    xmlFree(val);
		    val = nvalnorm;
		}

		ctxt->valid &= xmlValidateOneAttribute(&ctxt->vctxt,
			        ctxt->myDoc, ctxt->node, ret, val);
                xmlFree(val);
	    }
	} else {
	    ctxt->valid &= xmlValidateOneAttribute(&ctxt->vctxt, ctxt->myDoc,
					       ctxt->node, ret, value);
	}
    } else
#endif /* LIBXML_VALID_ENABLED */
           if (((ctxt->loadsubset & XML_SKIP_IDS) == 0) &&
	       (((ctxt->replaceEntities == 0) && (ctxt->external != 2)) ||
	        ((ctxt->replaceEntities != 0) && (ctxt->inSubset == 0)))) {
        /*
	 * when validating, the ID registration is done at the attribute
	 * validation level. Otherwise we have to do specific handling here.
	 */
	if (xmlStrEqual(fullname, BAD_CAST "xml:id")) {
	    /*
	     * Add the xml:id value
	     *
	     * Open issue: normalization of the value.
	     */
	    if (xmlValidateNCName(value, 1) != 0) {
	        xmlErrValid(ctxt, XML_DTD_XMLID_VALUE,
		      "xml:id : attribute value %s is not an NCName\n",
			    (const char *) value, NULL);
	    }
	    xmlAddID(&ctxt->vctxt, ctxt->myDoc, value, ret);
	} else if (xmlIsID(ctxt->myDoc, ctxt->node, ret))
	    xmlAddID(&ctxt->vctxt, ctxt->myDoc, value, ret);
	else if (xmlIsRef(ctxt->myDoc, ctxt->node, ret))
	    xmlAddRef(&ctxt->vctxt, ctxt->myDoc, value, ret);
    }

error:
    if (nval != NULL)
	xmlFree(nval);
    if (ns != NULL) 
	xmlFree(ns);
}

/*
 * xmlCheckDefaultedAttributes:
 *
 * Check defaulted attributes from the DTD
 */
static void
xmlCheckDefaultedAttributes(xmlParserCtxtPtr ctxt, const xmlChar *name,
	const xmlChar *prefix, const xmlChar **atts) {
    xmlElementPtr elemDecl;
    const xmlChar *att;
    int internal = 1;
    int i;

    elemDecl = xmlGetDtdQElementDesc(ctxt->myDoc->intSubset, name, prefix);
    if (elemDecl == NULL) {
	elemDecl = xmlGetDtdQElementDesc(ctxt->myDoc->extSubset, name, prefix);
	internal = 0;
    }

process_external_subset:

    if (elemDecl != NULL) {
	xmlAttributePtr attr = elemDecl->attributes;
	/*
	 * Check against defaulted attributes from the external subset
	 * if the document is stamped as standalone
	 */
	if ((ctxt->myDoc->standalone == 1) &&
	    (ctxt->myDoc->extSubset != NULL) &&
	    (ctxt->validate)) {
	    while (attr != NULL) {
		if ((attr->defaultValue != NULL) &&
		    (xmlGetDtdQAttrDesc(ctxt->myDoc->extSubset,
					attr->elem, attr->name,
					attr->prefix) == attr) &&
		    (xmlGetDtdQAttrDesc(ctxt->myDoc->intSubset,
					attr->elem, attr->name,
					attr->prefix) == NULL)) {
		    xmlChar *fulln;

		    if (attr->prefix != NULL) {
			fulln = xmlStrdup(attr->prefix);
			fulln = xmlStrcat(fulln, BAD_CAST ":");
			fulln = xmlStrcat(fulln, attr->name);
		    } else {