1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "chrome/utility/media_galleries/iapps_xml_utils.h"
7 #include "base/logging.h"
8 #include "base/stl_util.h"
9 #include "base/strings/string_number_conversions.h"
10 #include "third_party/libxml/chromium/libxml_utils.h"
14 bool SkipToNextElement(XmlReader* reader) {
15 if (!reader->SkipToElement()) {
16 // SkipToElement returns false if the current node is an end element,
17 // try to advance to the next element and then try again.
18 if (!reader->Read() || !reader->SkipToElement())
24 bool SeekToNodeAtCurrentDepth(XmlReader* reader, const std::string& name) {
25 int depth = reader->Depth();
27 if (!SkipToNextElement(reader) || reader->Depth() < depth)
29 DCHECK_EQ(depth, reader->Depth());
30 if (reader->NodeName() == name)
32 } while (reader->Next());
37 bool SeekInDict(XmlReader* reader, const std::string& key) {
38 DCHECK_EQ("dict", reader->NodeName());
40 int dict_content_depth = reader->Depth() + 1;
41 // Advance past the dict node and into the body of the dictionary.
45 while (reader->Depth() >= dict_content_depth) {
46 if (!SeekToNodeAtCurrentDepth(reader, "key"))
48 std::string found_key;
49 if (!reader->ReadElementContent(&found_key))
51 DCHECK_EQ(dict_content_depth, reader->Depth());
58 // Seek to the start of a tag and read the value into |result| if the node's
59 // name is |node_name|.
60 bool ReadSimpleValue(XmlReader* reader, const std::string& node_name,
61 std::string* result) {
62 if (!iapps::SkipToNextElement(reader))
64 if (reader->NodeName() != node_name)
66 return reader->ReadElementContent(result);
69 bool ReadString(XmlReader* reader, std::string* result) {
70 return ReadSimpleValue(reader, "string", result);
73 bool ReadInteger(XmlReader* reader, uint64* result) {
75 if (!ReadSimpleValue(reader, "integer", &value))
77 return base::StringToUint64(value, result);
80 std::string ReadPlatformFileAsString(const base::PlatformFile file) {
82 if (file == base::kInvalidPlatformFileValue)
85 // A "reasonable" artificial limit.
86 // TODO(vandebo): Add a UMA to figure out what common values are.
87 const int64 kMaxLibraryFileSize = 150 * 1024 * 1024;
88 base::PlatformFileInfo file_info;
89 if (!base::GetPlatformFileInfo(file, &file_info) ||
90 file_info.size > kMaxLibraryFileSize) {
91 base::ClosePlatformFile(file);
95 result.resize(file_info.size);
97 base::ReadPlatformFile(file, 0, string_as_array(&result), file_info.size);
98 if (bytes_read != file_info.size)
101 base::ClosePlatformFile(file);