1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <climits>
17
18 #include "metadata/metadata_reader.h"
19 #include "metadata/metadata_serializer.h"
20 #include "util/file.h"
21 #include "util/logger.h"
22
23 namespace OHOS {
24 namespace Idl {
25 const char* MetadataReader::tag = "MetadataReader";
26
ReadMetadataFromFile(const String & filePath)27 std::shared_ptr<MetaComponent> MetadataReader::ReadMetadataFromFile(const String& filePath)
28 {
29 File file(filePath, File::READ);
30 if (!file.IsValid()) {
31 Logger::E(tag, "Open \"%s\" file failed.", filePath.string());
32 return nullptr;
33 }
34
35 if (!file.Reset()) {
36 Logger::E(tag, "Reset \"%s\" file failed.", filePath.string());
37 return nullptr;
38 }
39
40 MetaComponent header;
41
42 if (!file.ReadData((void*)&header, sizeof(MetaComponent))) {
43 Logger::E(tag, "Read \"%s\" file failed.", filePath.string());
44 return nullptr;
45 }
46
47 if (header.magic_ != METADATA_MAGIC_NUMBER || header.size_ <= 0 || header.size_ > INT_MAX) {
48 Logger::E(tag, "The metadata in \"%s\" file is bad.", filePath.string());
49 return nullptr;
50 }
51
52 if (!file.Reset()) {
53 Logger::E(tag, "Reset \"%s\" file failed.", filePath.string());
54 return nullptr;
55 }
56
57 void* data = malloc(header.size_);
58 if (data == nullptr) {
59 Logger::E(tag, "Malloc metadata failed.");
60 return nullptr;
61 }
62
63 if (!file.ReadData(data, header.size_)) {
64 Logger::E(tag, "Read \"%s\" file failed.", filePath.string());
65 free(data);
66 return nullptr;
67 }
68
69 std::shared_ptr<MetaComponent> metadata(
70 (MetaComponent*)data, [](MetaComponent* p) { free(p); });
71
72 MetadataSerializer serializer((uintptr_t)data);
73 serializer.Deserialize();
74
75 return metadata;
76 }
77 } // namespace Idl
78 } // namespace OHOS
79