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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "chrome/common/libxml_utils.h"
#include "base/logging.h"
#include "libxml/xmlreader.h"
std::string XmlStringToStdString(const xmlChar* xmlstring) {
// xmlChar*s are UTF-8, so this cast is safe.
if (xmlstring)
return std::string(reinterpret_cast<const char*>(xmlstring));
else
return "";
}
XmlReader::XmlReader()
: reader_(NULL),
#pragma warning(suppress: 4355) // Okay to pass "this" here.
error_func_(this, &XmlReader::GenericErrorCallback) {
}
XmlReader::~XmlReader() {
if (reader_)
xmlFreeTextReader(reader_);
}
/* static */ void XmlReader::GenericErrorCallback(void* context,
const char* msg, ...) {
va_list args;
va_start(args, msg);
char buffer[1 << 9];
vsnprintf_s(buffer, arraysize(buffer), _TRUNCATE, msg, args);
XmlReader* reader = static_cast<XmlReader*>(context);
reader->errors_.append(buffer);
}
bool XmlReader::Load(const std::string& input) {
const int kParseOptions =
XML_PARSE_RECOVER | // recover on errors
XML_PARSE_NONET; // forbid network access
// TODO(evanm): Verify it's OK to pass NULL for the URL and encoding.
// The libxml code allows for these, but it's unclear what effect is has.
reader_ = xmlReaderForMemory(input.data(), static_cast<int>(input.size()),
NULL, NULL, kParseOptions);
return reader_ != NULL;
}
bool XmlReader::LoadFile(const std::string& file_path) {
const int kParseOptions =
XML_PARSE_RECOVER | // recover on errors
XML_PARSE_NONET; // forbid network access
reader_ = xmlReaderForFile(file_path.c_str(), NULL, kParseOptions);
return reader_ != NULL;
}
bool XmlReader::NodeAttribute(const char* name, std::string* out) {
xmlChar* value = xmlTextReaderGetAttribute(reader_, BAD_CAST name);
if (!value)
return false;
*out = XmlStringToStdString(value);
xmlFree(value);
return true;
}
bool XmlReader::ReadElementContent(std::string* content) {
DCHECK(NodeType() == XML_READER_TYPE_ELEMENT);
const int start_depth = Depth();
if (xmlTextReaderIsEmptyElement(reader_)) {
// Empty tag. We succesfully read the content, but it's
// empty.
*content = "";
// Advance past this empty tag.
if (!Read())
return false;
return true;
}
// Advance past opening element tag.
if (!Read())
return false;
// Read the content. We read up until we hit a closing tag at the
// same level as our starting point.
while (NodeType() != XML_READER_TYPE_END_ELEMENT || Depth() != start_depth) {
*content += XmlStringToStdString(xmlTextReaderConstValue(reader_));
if (!Read())
return false;
}
// Advance past ending element tag.
DCHECK_EQ(NodeType(), XML_READER_TYPE_END_ELEMENT);
if (!Read())
return false;
return true;
}
bool XmlReader::SkipToElement() {
do {
switch (NodeType()) {
case XML_READER_TYPE_ELEMENT:
return true;
case XML_READER_TYPE_END_ELEMENT:
return false;
default:
// Skip all other node types.
continue;
}
} while (Read());
return false;
}
// XmlWriter functions
XmlWriter::XmlWriter() :
writer_(NULL) {}
XmlWriter::~XmlWriter() {
if (writer_)
xmlFreeTextWriter(writer_);
if (buffer_)
xmlBufferFree(buffer_);
}
void XmlWriter::StartWriting() {
buffer_ = xmlBufferCreate();
writer_ = xmlNewTextWriterMemory(buffer_, 0);
xmlTextWriterSetIndent(writer_, 1);
xmlTextWriterStartDocument(writer_, NULL, NULL, NULL);
}
void XmlWriter::StopWriting() {
xmlTextWriterEndDocument(writer_);
xmlFreeTextWriter(writer_);
writer_ = NULL;
}
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