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_FORMAT_BINARY_CHUNKWRITER_H
18#define AAPT_FORMAT_BINARY_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  }
32  ChunkWriter(ChunkWriter&&) = default;
33  ChunkWriter& operator=(ChunkWriter&&) = default;
34
35  template <typename T>
36  inline T* StartChunk(uint16_t type) {
37    start_size_ = buffer_->size();
38    T* chunk = buffer_->NextBlock<T>();
39    header_ = &chunk->header;
40    header_->type = util::HostToDevice16(type);
41    header_->headerSize = util::HostToDevice16(sizeof(T));
42    return chunk;
43  }
44
45  template <typename T>
46  inline T* NextBlock(size_t count = 1) {
47    return buffer_->NextBlock<T>(count);
48  }
49
50  inline BigBuffer* buffer() {
51    return buffer_;
52  }
53
54  inline android::ResChunk_header* chunk_header() {
55    return header_;
56  }
57
58  inline size_t size() {
59    return buffer_->size() - start_size_;
60  }
61
62  inline android::ResChunk_header* Finish() {
63    buffer_->Align4();
64    header_->size = util::HostToDevice32(buffer_->size() - start_size_);
65    return header_;
66  }
67
68 private:
69  DISALLOW_COPY_AND_ASSIGN(ChunkWriter);
70
71  BigBuffer* buffer_;
72  size_t start_size_ = 0;
73  android::ResChunk_header* header_ = nullptr;
74};
75
76template <>
77inline android::ResChunk_header* ChunkWriter::StartChunk(uint16_t type) {
78  start_size_ = buffer_->size();
79  header_ = buffer_->NextBlock<android::ResChunk_header>();
80  header_->type = util::HostToDevice16(type);
81  header_->headerSize = util::HostToDevice16(sizeof(android::ResChunk_header));
82  return header_;
83}
84
85}  // namespace aapt
86
87#endif /* AAPT_FORMAT_BINARY_CHUNKWRITER_H */
88