1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "LoadedApk.h"
18
19#include "ResourceValues.h"
20#include "ValueVisitor.h"
21#include "flatten/Archive.h"
22#include "flatten/TableFlattener.h"
23#include "io/BigBufferInputStream.h"
24#include "io/Util.h"
25
26namespace aapt {
27
28std::unique_ptr<LoadedApk> LoadedApk::LoadApkFromPath(IAaptContext* context,
29                                                      const android::StringPiece& path) {
30  Source source(path);
31  std::string error;
32  std::unique_ptr<io::ZipFileCollection> apk = io::ZipFileCollection::Create(path, &error);
33  if (!apk) {
34    context->GetDiagnostics()->Error(DiagMessage(source) << error);
35    return {};
36  }
37
38  io::IFile* file = apk->FindFile("resources.arsc");
39  if (!file) {
40    context->GetDiagnostics()->Error(DiagMessage(source) << "no resources.arsc found");
41    return {};
42  }
43
44  std::unique_ptr<io::IData> data = file->OpenAsData();
45  if (!data) {
46    context->GetDiagnostics()->Error(DiagMessage(source) << "could not open resources.arsc");
47    return {};
48  }
49
50  std::unique_ptr<ResourceTable> table = util::make_unique<ResourceTable>();
51  BinaryResourceParser parser(context, table.get(), source, data->data(), data->size(), apk.get());
52  if (!parser.Parse()) {
53    return {};
54  }
55  return util::make_unique<LoadedApk>(source, std::move(apk), std::move(table));
56}
57
58bool LoadedApk::WriteToArchive(IAaptContext* context, const TableFlattenerOptions& options,
59                               IArchiveWriter* writer) {
60  std::set<std::string> referenced_resources;
61  // List the files being referenced in the resource table.
62  for (auto& pkg : table_->packages) {
63    for (auto& type : pkg->types) {
64      for (auto& entry : type->entries) {
65        for (auto& config_value : entry->values) {
66          FileReference* file_ref = ValueCast<FileReference>(config_value->value.get());
67          if (file_ref) {
68            referenced_resources.insert(*file_ref->path);
69          }
70        }
71      }
72    }
73  }
74
75  std::unique_ptr<io::IFileCollectionIterator> iterator = apk_->Iterator();
76  while (iterator->HasNext()) {
77    io::IFile* file = iterator->Next();
78
79    std::string path = file->GetSource().path;
80    // The name of the path has the format "<zip-file-name>@<path-to-file>".
81    path = path.substr(path.find("@") + 1);
82
83    // Skip resources that are not referenced if requested.
84    if (path.find("res/") == 0 && referenced_resources.find(path) == referenced_resources.end()) {
85      if (context->IsVerbose()) {
86        context->GetDiagnostics()->Note(DiagMessage()
87                                        << "Removing resource '" << path << "' from APK.");
88      }
89      continue;
90    }
91
92    // The resource table needs to be re-serialized since it might have changed.
93    if (path == "resources.arsc") {
94      BigBuffer buffer(4096);
95      // TODO(adamlesinski): How to determine if there were sparse entries (and if to encode
96      // with sparse entries) b/35389232.
97      TableFlattener flattener(options, &buffer);
98      if (!flattener.Consume(context, table_.get())) {
99        return false;
100      }
101
102      io::BigBufferInputStream input_stream(&buffer);
103      if (!io::CopyInputStreamToArchive(context, &input_stream, path, ArchiveEntry::kAlign,
104                                        writer)) {
105        return false;
106      }
107
108    } else {
109      uint32_t compression_flags = file->WasCompressed() ? ArchiveEntry::kCompress : 0u;
110      if (!io::CopyFileToArchive(context, file, path, compression_flags, writer)) {
111        return false;
112      }
113    }
114  }
115  return true;
116}
117
118}  // namespace aapt
119