Add chrome to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 167 insertions, 0 deletions

diff --git a/chrome/common/libxml_utils.cc b/chrome/common/libxml_utils.cc
new file mode 100644
index 0000000..96b1665
--- /dev/null
+++ b/chrome/common/libxml_utils.cc
@@ -0,0 +1,167 @@
+// 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;
+}