| // Copyright 2015 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "cobalt/dom_parser/libxml_xml_parser_wrapper.h" |
| |
| #include "base/strings/string_util.h" |
| |
| namespace cobalt { |
| namespace dom_parser { |
| namespace { |
| |
| // Libxml SAX handler. |
| // http://www.xmlsoft.org/html/libxml-tree.html#xmlSAXHandler |
| |
| // NOTE: Please read about XXE attacks before implementing handler fields such |
| // as resolveEntity and entityDecl. |
| xmlSAXHandler xml_sax_handler = { |
| NULL, /* internalSubset */ |
| NULL, /* isStandalone */ |
| NULL, /* hasInternalSubset */ |
| NULL, /* hasExternalSubset */ |
| NULL, /* resolveEntity */ |
| NULL, /* getEntity */ |
| NULL, /* entityDecl */ |
| NULL, /* notationDecl */ |
| NULL, /* attributeDecl */ |
| NULL, /* elementDecl */ |
| NULL, /* unparsedEntityDecl */ |
| NULL, /* setDocumentLocator */ |
| &StartDocument, /* startDocument */ |
| &EndDocument, /* endDocument */ |
| &StartElement, /* startElement */ |
| &EndElement, /* endElement */ |
| NULL, /* reference */ |
| &Characters, /* characters */ |
| NULL, /* ignorableWhitespace */ |
| NULL, /* processingInstruction */ |
| &Comment, /* comment */ |
| &ParserWarning, /* xmlParserWarning */ |
| &ParserError, /* xmlParserError */ |
| &ParserFatal, /* xmlParserFatalError */ |
| NULL, /* getParameterEntity */ |
| &CDATABlock, /* cdataBlock */ |
| NULL, /* externalSubset */ |
| 1, /* initialized */ |
| NULL, /* private */ |
| NULL, /* startElementNsSAX2Func */ |
| NULL, /* endElementNsSAX2Func */ |
| NULL /* xmlStructuredErrorFunc */ |
| }; |
| |
| } // namespace |
| |
| ////////////////////////////////////////////////////////////////// |
| // LibxmlXMLParserWrapper |
| ////////////////////////////////////////////////////////////////// |
| |
| LibxmlXMLParserWrapper::~LibxmlXMLParserWrapper() { |
| if (xml_parser_context_) { |
| xmlFreeParserCtxt(xml_parser_context_); |
| } |
| } |
| |
| void LibxmlXMLParserWrapper::DecodeChunk(const char* data, size_t size) { |
| if (size == 0) { |
| return; |
| } |
| |
| std::string current_chunk; |
| PreprocessChunk(data, size, ¤t_chunk); |
| |
| if (max_severity() == kFatal) { |
| return; |
| } |
| |
| if (!xml_parser_context_) { |
| xml_parser_context_ = xmlCreatePushParserCtxt( |
| &xml_sax_handler, this, current_chunk.c_str(), |
| static_cast<int>(current_chunk.size()), NULL /*filename*/); |
| |
| if (!xml_parser_context_) { |
| static const char kErrorUnableCreateParser[] = |
| "Unable to create the libxml2 parser."; |
| OnParsingIssue(kFatal, kErrorUnableCreateParser); |
| } |
| } else { |
| xmlParseChunk(xml_parser_context_, current_chunk.c_str(), |
| static_cast<int>(current_chunk.size()), |
| 0 /*do not terminate*/); |
| } |
| } |
| |
| void LibxmlXMLParserWrapper::Finish() { |
| if (xml_parser_context_) { |
| xmlParseChunk(xml_parser_context_, NULL, 0, |
| 1 /*terminate*/); // Triggers EndDocument |
| } |
| } |
| |
| base::SourceLocation LibxmlXMLParserWrapper::GetSourceLocation() { |
| base::SourceLocation source_location(first_chunk_location().file_path, |
| xml_parser_context_->input->line, |
| xml_parser_context_->input->col); |
| base::AdjustForStartLocation( |
| first_chunk_location().line_number, first_chunk_location().column_number, |
| &source_location.line_number, &source_location.column_number); |
| return source_location; |
| } |
| |
| } // namespace dom_parser |
| } // namespace cobalt |