1/*
2 * Copyright (C) 2015 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#ifndef AAPT_FLATTEN_CHUNKWRITER_H
18#define AAPT_FLATTEN_CHUNKWRITER_H
19
20#include "android-base/macros.h"
21#include "androidfw/ResourceTypes.h"
22
23#include "util/BigBuffer.h"
24#include "util/Util.h"
25
26namespace aapt {
27
28class ChunkWriter {
29 public:
30  explicit inline ChunkWriter(BigBuffer* buffer) : buffer_(buffer) {}
31  ChunkWriter(ChunkWriter&&) = default;
32  ChunkWriter& operator=(ChunkWriter&&) = default;
33
34  template <typename T>
35  inline T* StartChunk(uint16_t type) {
36    start_size_ = buffer_->size();
37    T* chunk = buffer_->NextBlock<T>();
38    header_ = &chunk->header;
39    header_->type = util::HostToDevice16(type);
40    header_->headerSize = util::HostToDevice16(sizeof(T));
41    return chunk;
42  }
43
44  template <typename T>
45  inline T* NextBlock(size_t count = 1) {
46    return buffer_->NextBlock<T>(count);
47  }
48
49  inline BigBuffer* buffer() { return buffer_; }
50
51  inline android::ResChunk_header* chunk_header() { return header_; }
52
53  inline size_t size() { return buffer_->size() - start_size_; }
54
55  inline android::ResChunk_header* Finish() {
56    buffer_->Align4();
57    header_->size = util::HostToDevice32(buffer_->size() - start_size_);
58    return header_;
59  }
60
61 private:
62  DISALLOW_COPY_AND_ASSIGN(ChunkWriter);
63
64  BigBuffer* buffer_;
65  size_t start_size_ = 0;
66  android::ResChunk_header* header_ = nullptr;
67};
68
69template <>
70inline android::ResChunk_header* ChunkWriter::StartChunk(uint16_t type) {
71  start_size_ = buffer_->size();
72  header_ = buffer_->NextBlock<android::ResChunk_header>();
73  header_->type = util::HostToDevice16(type);
74  header_->headerSize = util::HostToDevice16(sizeof(android::ResChunk_header));
75  return header_;
76}
77
78}  // namespace aapt
79
80#endif /* AAPT_FLATTEN_CHUNKWRITER_H */
81