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/*
* Copyright (c) 2010-2019 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/Parser/LibXMLParser.h>
#include <cassert>
#include <cstring>
#include <limits>
#include <memory>
#include <string>
#include <libxml/parser.h>
#include <Swiften/Base/Log.h>
#include <Swiften/Parser/XMLParserClient.h>
namespace {
std::string asString(const unsigned char* s) {
return s ? std::string(reinterpret_cast<const char*>(s)) : std::string();
}
}
namespace Swift {
struct LibXMLParser::Private {
xmlSAXHandler handler_;
xmlParserCtxtPtr context_;
};
static void handleStartElement(void* parser, const xmlChar* name, const xmlChar* prefix, const xmlChar* xmlns, int nbNamespaces, const xmlChar** namespaces, int nbAttributes, int nbDefaulted, const xmlChar ** attributes) {
AttributeMap attributeValues;
if (nbDefaulted != 0) {
// Just because i don't understand what this means yet :-)
SWIFT_LOG(error) << "Unexpected nbDefaulted on XML element";
}
for (int i = 0; i < nbAttributes*5; i += 5) {
std::string attributeName = asString(attributes[i]);
std::string attributePrefix = asString(attributes[i+1]);
std::string attributeNS = asString(attributes[i+2]);
assert(attributes[i+4] >= attributes[i+3]);
attributeValues.addAttribute(
attributeName,
attributeNS,
attributePrefix,
std::string(reinterpret_cast<const char*>(attributes[i+3]),
static_cast<size_t>(attributes[i+4]-attributes[i+3])));
}
auto* client = static_cast<XMLParser*>(parser)->getClient();
for (auto i = 0; i < nbNamespaces * 2; i += 2) {
const auto prefix = asString(namespaces[i]);
const auto uri = asString(namespaces[i + 1]);
client->handleNamespaceDeclaration(prefix, uri);
}
auto nameStr = asString(name);
auto xmlsnsStr = asString(xmlns);
auto prefixStr = asString(prefix);
client->handleStartElementPrefix(prefixStr, xmlsnsStr, nameStr, attributeValues);
client->handleStartElement(nameStr, xmlsnsStr, attributeValues);
}
static void handleEndElement(void *parser, const xmlChar* name, const xmlChar*, const xmlChar* xmlns) {
static_cast<XMLParser*>(parser)->getClient()->handleEndElement(asString(name), asString(xmlns));
}
static void handleCharacterData(void* parser, const xmlChar* data, int len) {
assert(len >= 0);
static_cast<XMLParser*>(parser)->getClient()->handleCharacterData(std::string(reinterpret_cast<const char*>(data), static_cast<size_t>(len)));
}
static void handleComment(void* parser, const xmlChar* /*data*/) {
if (!static_cast<LibXMLParser*>(parser)->allowsComments()) {
static_cast<LibXMLParser*>(parser)->stopParser();
}
}
static void handleEntityDeclaration(void * parser, const xmlChar* /*name*/, int /*type*/, const xmlChar* /*publicId*/, const xmlChar* /*systemId*/, xmlChar* /*content*/) {
static_cast<LibXMLParser*>(parser)->stopParser();
}
static void handleProcessingInstruction(void* parser, const xmlChar* /*target*/, const xmlChar* /*data*/) {
static_cast<LibXMLParser*>(parser)->stopParser();
}
static void handleExternalSubset(void* parser, const xmlChar * /*name*/, const xmlChar * /*ExternalID*/, const xmlChar * /*SystemID*/) {
static_cast<LibXMLParser*>(parser)->stopParser();
}
static void handleError(void*, const char* /*m*/, ... ) {
/*
va_list args;
va_start(args, m);
vfprintf(stdout, m, args);
va_end(args);
*/
}
static void handleWarning(void*, const char*, ... ) {
}
static void handleGenericError(void*, const char*, ... ) {
}
static void handleStructuredError(void *userData, const xmlError *error) {
}
bool LibXMLParser::initialized = false;
LibXMLParser::LibXMLParser(XMLParserClient* client, bool allowComments) : XMLParser(client, allowComments), p(new Private()) {
// Initialize libXML for multithreaded applications
if (!initialized) {
xmlInitParser();
xmlSetGenericErrorFunc(nullptr, handleGenericError);
xmlSetStructuredErrorFunc(nullptr, handleStructuredError);
initialized = true;
}
memset(&p->handler_, 0, sizeof(p->handler_) );
p->handler_.initialized = XML_SAX2_MAGIC;
p->handler_.startElementNs = &handleStartElement;
p->handler_.endElementNs = &handleEndElement;
p->handler_.characters = &handleCharacterData;
p->handler_.warning = &handleWarning;
p->handler_.error = &handleError;
p->handler_.comment = &handleComment;
p->handler_.entityDecl = &handleEntityDeclaration;
p->handler_.processingInstruction = &handleProcessingInstruction;
p->handler_.externalSubset = &handleExternalSubset;
p->context_ = xmlCreatePushParserCtxt(&p->handler_, this, nullptr, 0, nullptr);
xmlCtxtUseOptions(p->context_, XML_PARSE_NOENT);
assert(p->context_);
}
LibXMLParser::~LibXMLParser() {
if (p->context_) {
xmlFreeParserCtxt(p->context_);
}
}
bool LibXMLParser::parse(const std::string& data, bool finalData) {
if (data.size() > std::numeric_limits<int>::max()) {
return false;
}
auto error = xmlParseChunk(p->context_, data.c_str(), static_cast<int>(data.size()), finalData);
if (error == XML_ERR_OK) {
return true;
}
if (stopped_) return false;
if (error == XML_WAR_NS_URI || error == XML_WAR_NS_URI_RELATIVE) {
xmlCtxtResetLastError(p->context_);
p->context_->errNo = XML_ERR_OK;
return true;
}
return false;
}
void LibXMLParser::stopParser() {
stopped_ = true;
xmlStopParser(p->context_);
}
}
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