1 /*
2 * Copyright (C) 2018 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 "apk_layout_compiler.h"
18 #include "dex_layout_compiler.h"
19 #include "java_lang_builder.h"
20 #include "layout_validation.h"
21 #include "util.h"
22
23 #include "androidfw/ApkAssets.h"
24 #include "androidfw/AssetManager2.h"
25 #include "androidfw/ResourceTypes.h"
26
27 #include <iostream>
28 #include <locale>
29
30 #include "android-base/stringprintf.h"
31
32 namespace startop {
33
34 using android::ResXMLParser;
35 using android::base::StringPrintf;
36
37 class ResXmlVisitorAdapter {
38 public:
ResXmlVisitorAdapter(ResXMLParser * parser)39 ResXmlVisitorAdapter(ResXMLParser* parser) : parser_{parser} {}
40
41 template <typename Visitor>
Accept(Visitor * visitor)42 void Accept(Visitor* visitor) {
43 size_t depth{0};
44 do {
45 switch (parser_->next()) {
46 case ResXMLParser::START_DOCUMENT:
47 depth++;
48 visitor->VisitStartDocument();
49 break;
50 case ResXMLParser::END_DOCUMENT:
51 depth--;
52 visitor->VisitEndDocument();
53 break;
54 case ResXMLParser::START_TAG: {
55 depth++;
56 size_t name_length = 0;
57 const char16_t* name = parser_->getElementName(&name_length);
58 visitor->VisitStartTag(std::u16string{name, name_length});
59 break;
60 }
61 case ResXMLParser::END_TAG:
62 depth--;
63 visitor->VisitEndTag();
64 break;
65 default:;
66 }
67 } while (depth > 0 || parser_->getEventType() == ResXMLParser::FIRST_CHUNK_CODE);
68 }
69
70 private:
71 ResXMLParser* parser_;
72 };
73
CanCompileLayout(ResXMLParser * parser)74 bool CanCompileLayout(ResXMLParser* parser) {
75 ResXmlVisitorAdapter adapter{parser};
76 LayoutValidationVisitor visitor;
77 adapter.Accept(&visitor);
78
79 return visitor.can_compile();
80 }
81
82 namespace {
CompileApkAssetsLayouts(const std::unique_ptr<android::ApkAssets> & assets,CompilationTarget target,std::ostream & target_out)83 void CompileApkAssetsLayouts(const std::unique_ptr<android::ApkAssets>& assets,
84 CompilationTarget target, std::ostream& target_out) {
85 android::AssetManager2 resources;
86 resources.SetApkAssets({assets.get()});
87
88 std::string package_name;
89
90 // TODO: handle multiple packages better
91 bool first = true;
92 for (const auto& package : assets->GetLoadedArsc()->GetPackages()) {
93 CHECK(first);
94 package_name = package->GetPackageName();
95 first = false;
96 }
97
98 dex::DexBuilder dex_file;
99 dex::ClassBuilder compiled_view{
100 dex_file.MakeClass(StringPrintf("%s.CompiledView", package_name.c_str()))};
101 std::vector<dex::MethodBuilder> methods;
102
103 assets->GetAssetsProvider()->ForEachFile("res/", [&](const android::StringPiece& s,
104 android::FileType) {
105 if (s == "layout") {
106 auto path = StringPrintf("res/%s/", s.to_string().c_str());
107 assets->GetAssetsProvider()->ForEachFile(path, [&](const android::StringPiece& layout_file,
108 android::FileType) {
109 auto layout_path = StringPrintf("%s%s", path.c_str(), layout_file.to_string().c_str());
110 android::ApkAssetsCookie cookie = android::kInvalidCookie;
111 auto asset = resources.OpenNonAsset(layout_path, android::Asset::ACCESS_RANDOM, &cookie);
112 CHECK(asset);
113 CHECK(android::kInvalidCookie != cookie);
114 const auto dynamic_ref_table = resources.GetDynamicRefTableForCookie(cookie);
115 CHECK(nullptr != dynamic_ref_table);
116 android::ResXMLTree xml_tree{dynamic_ref_table};
117 xml_tree.setTo(asset->getBuffer(/*wordAligned=*/true),
118 asset->getLength(),
119 /*copy_data=*/true);
120 android::ResXMLParser parser{xml_tree};
121 parser.restart();
122 if (CanCompileLayout(&parser)) {
123 parser.restart();
124 const std::string layout_name = startop::util::FindLayoutNameFromFilename(layout_path);
125 ResXmlVisitorAdapter adapter{&parser};
126 switch (target) {
127 case CompilationTarget::kDex: {
128 methods.push_back(compiled_view.CreateMethod(
129 layout_name,
130 dex::Prototype{dex::TypeDescriptor::FromClassname("android.view.View"),
131 dex::TypeDescriptor::FromClassname("android.content.Context"),
132 dex::TypeDescriptor::Int()}));
133 DexViewBuilder builder(&methods.back());
134 builder.Start();
135 LayoutCompilerVisitor visitor{&builder};
136 adapter.Accept(&visitor);
137 builder.Finish();
138 methods.back().Encode();
139 break;
140 }
141 case CompilationTarget::kJavaLanguage: {
142 JavaLangViewBuilder builder{package_name, layout_name, target_out};
143 builder.Start();
144 LayoutCompilerVisitor visitor{&builder};
145 adapter.Accept(&visitor);
146 builder.Finish();
147 break;
148 }
149 }
150 }
151 });
152 }
153 });
154
155 if (target == CompilationTarget::kDex) {
156 slicer::MemView image{dex_file.CreateImage()};
157 target_out.write(image.ptr<const char>(), image.size());
158 }
159 }
160 } // namespace
161
CompileApkLayouts(const std::string & filename,CompilationTarget target,std::ostream & target_out)162 void CompileApkLayouts(const std::string& filename, CompilationTarget target,
163 std::ostream& target_out) {
164 auto assets = android::ApkAssets::Load(filename);
165 CompileApkAssetsLayouts(assets, target, target_out);
166 }
167
CompileApkLayoutsFd(android::base::unique_fd fd,CompilationTarget target,std::ostream & target_out)168 void CompileApkLayoutsFd(android::base::unique_fd fd, CompilationTarget target,
169 std::ostream& target_out) {
170 constexpr const char* friendly_name{"viewcompiler assets"};
171 auto assets = android::ApkAssets::LoadFromFd(std::move(fd), friendly_name);
172 CompileApkAssetsLayouts(assets, target, target_out);
173 }
174
175 } // namespace startop
176