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 "idmap2/BinaryStreamVisitor.h"
18
19 #include <algorithm>
20 #include <cstring>
21 #include <string>
22
23 #include "android-base/macros.h"
24
25 namespace android::idmap2 {
26
Write8(uint8_t value)27 void BinaryStreamVisitor::Write8(uint8_t value) {
28 stream_.write(reinterpret_cast<char*>(&value), sizeof(uint8_t));
29 }
30
Write16(uint16_t value)31 void BinaryStreamVisitor::Write16(uint16_t value) {
32 uint16_t x = htodl(value);
33 stream_.write(reinterpret_cast<char*>(&x), sizeof(uint16_t));
34 }
35
Write32(uint32_t value)36 void BinaryStreamVisitor::Write32(uint32_t value) {
37 uint32_t x = htodl(value);
38 stream_.write(reinterpret_cast<char*>(&x), sizeof(uint32_t));
39 }
40
WriteString(StringPiece value)41 void BinaryStreamVisitor::WriteString(StringPiece value) {
42 // pad with null to nearest word boundary;
43 size_t padding_size = CalculatePadding(value.size());
44 Write32(value.size());
45 stream_.write(value.data(), value.size());
46 stream_.write("\0\0\0\0", padding_size);
47 }
48
visit(const Idmap & idmap ATTRIBUTE_UNUSED)49 void BinaryStreamVisitor::visit(const Idmap& idmap ATTRIBUTE_UNUSED) {
50 // nothing to do
51 }
52
visit(const IdmapHeader & header)53 void BinaryStreamVisitor::visit(const IdmapHeader& header) {
54 Write32(header.GetMagic());
55 Write32(header.GetVersion());
56 Write32(header.GetTargetCrc());
57 Write32(header.GetOverlayCrc());
58 Write32(header.GetFulfilledPolicies());
59 Write32(static_cast<uint8_t>(header.GetEnforceOverlayable()));
60 WriteString(header.GetTargetPath());
61 WriteString(header.GetOverlayPath());
62 WriteString(header.GetOverlayName());
63 WriteString(header.GetDebugInfo());
64 }
65
visit(const IdmapData & data)66 void BinaryStreamVisitor::visit(const IdmapData& data) {
67 for (const auto& target_entry : data.GetTargetEntries()) {
68 Write32(target_entry.target_id);
69 Write32(target_entry.overlay_id);
70 }
71
72 static constexpr uint16_t kValueSize = 8U;
73 std::vector<std::pair<ConfigDescription, TargetValue>> target_values;
74 target_values.reserve(data.GetHeader()->GetTargetInlineEntryValueCount());
75 for (const auto& target_entry : data.GetTargetInlineEntries()) {
76 Write32(target_entry.target_id);
77 Write32(target_values.size());
78 Write32(target_entry.values.size());
79 target_values.insert(
80 target_values.end(), target_entry.values.begin(), target_entry.values.end());
81 }
82
83 std::vector<ConfigDescription> configs;
84 configs.reserve(data.GetHeader()->GetConfigCount());
85 for (const auto& target_entry_value : target_values) {
86 auto config_it = find(configs.begin(), configs.end(), target_entry_value.first);
87 if (config_it != configs.end()) {
88 Write32(config_it - configs.begin());
89 } else {
90 Write32(configs.size());
91 configs.push_back(target_entry_value.first);
92 }
93 Write16(kValueSize);
94 Write8(0U); // padding
95 Write8(target_entry_value.second.data_type);
96 Write32(target_entry_value.second.data_value);
97 }
98
99 for( auto& cd : configs) {
100 cd.swapHtoD();
101 stream_.write(reinterpret_cast<char*>(&cd), sizeof(cd));
102 }
103
104 for (const auto& overlay_entry : data.GetOverlayEntries()) {
105 Write32(overlay_entry.overlay_id);
106 Write32(overlay_entry.target_id);
107 }
108
109 WriteString(data.GetStringPoolData());
110 }
111
visit(const IdmapData::Header & header)112 void BinaryStreamVisitor::visit(const IdmapData::Header& header) {
113 Write32(header.GetTargetEntryCount());
114 Write32(header.GetTargetInlineEntryCount());
115 Write32(header.GetTargetInlineEntryValueCount());
116 Write32(header.GetConfigCount());
117 Write32(header.GetOverlayEntryCount());
118 Write32(header.GetStringPoolIndexOffset());
119 }
120
121 } // namespace android::idmap2
122