Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 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_IO_DATA_H |
| 18 | #define AAPT_IO_DATA_H |
| 19 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 20 | #include <memory> |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 21 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 22 | #include "android-base/macros.h" |
| 23 | #include "utils/FileMap.h" |
| 24 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 25 | #include "io/Io.h" |
| 26 | |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 27 | namespace aapt { |
| 28 | namespace io { |
| 29 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 30 | // Interface for a block of contiguous memory. An instance of this interface owns the data. |
Adam Lesinski | 0045116 | 2017-10-03 07:44:08 -0700 | [diff] [blame] | 31 | class IData : public KnownSizeInputStream { |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 32 | public: |
| 33 | virtual ~IData() = default; |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 34 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 35 | virtual const void* data() const = 0; |
| 36 | virtual size_t size() const = 0; |
Adam Lesinski | 0045116 | 2017-10-03 07:44:08 -0700 | [diff] [blame] | 37 | |
| 38 | virtual size_t TotalSize() const override { |
| 39 | return size(); |
| 40 | } |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 41 | }; |
| 42 | |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 43 | class DataSegment : public IData { |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 44 | public: |
| 45 | explicit DataSegment(std::unique_ptr<IData> data, size_t offset, size_t len) |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 46 | : data_(std::move(data)), offset_(offset), len_(len), next_read_(offset) {} |
| 47 | virtual ~DataSegment() = default; |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 48 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 49 | const void* data() const override { |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 50 | return static_cast<const uint8_t*>(data_->data()) + offset_; |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 51 | } |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 52 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 53 | size_t size() const override { return len_; } |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 54 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 55 | bool Next(const void** data, size_t* size) override { |
| 56 | if (next_read_ == offset_ + len_) { |
| 57 | return false; |
| 58 | } |
| 59 | *data = static_cast<const uint8_t*>(data_->data()) + next_read_; |
| 60 | *size = len_ - (next_read_ - offset_); |
| 61 | next_read_ = offset_ + len_; |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | void BackUp(size_t count) override { |
| 66 | if (count > next_read_ - offset_) { |
| 67 | next_read_ = offset_; |
| 68 | } else { |
| 69 | next_read_ -= count; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | bool CanRewind() const override { return true; } |
| 74 | |
| 75 | bool Rewind() override { |
| 76 | next_read_ = offset_; |
| 77 | return true; |
| 78 | } |
| 79 | |
| 80 | size_t ByteCount() const override { return next_read_ - offset_; } |
| 81 | |
| 82 | bool HadError() const override { return false; } |
| 83 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 84 | private: |
| 85 | DISALLOW_COPY_AND_ASSIGN(DataSegment); |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 86 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 87 | std::unique_ptr<IData> data_; |
| 88 | size_t offset_; |
| 89 | size_t len_; |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 90 | size_t next_read_; |
Adam Lesinski | 5eeaadd | 2016-08-25 12:26:56 -0700 | [diff] [blame] | 91 | }; |
| 92 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 93 | // Implementation of IData that exposes a memory mapped file. |
| 94 | // The mmapped file is owned by this object. |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 95 | class MmappedData : public IData { |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 96 | public: |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 97 | explicit MmappedData(android::FileMap&& map) : map_(std::forward<android::FileMap>(map)) {} |
| 98 | virtual ~MmappedData() = default; |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 99 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 100 | const void* data() const override { return map_.getDataPtr(); } |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 101 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 102 | size_t size() const override { return map_.getDataLength(); } |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 103 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 104 | bool Next(const void** data, size_t* size) override { |
| 105 | if (next_read_ == map_.getDataLength()) { |
| 106 | return false; |
| 107 | } |
| 108 | *data = reinterpret_cast<const uint8_t*>(map_.getDataPtr()) + next_read_; |
| 109 | *size = map_.getDataLength() - next_read_; |
| 110 | next_read_ = map_.getDataLength(); |
| 111 | return true; |
| 112 | } |
| 113 | |
| 114 | void BackUp(size_t count) override { |
| 115 | if (count > next_read_) { |
| 116 | next_read_ = 0; |
| 117 | } else { |
| 118 | next_read_ -= count; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | bool CanRewind() const override { return true; } |
| 123 | |
| 124 | bool Rewind() override { |
| 125 | next_read_ = 0; |
| 126 | return true; |
| 127 | } |
| 128 | |
| 129 | size_t ByteCount() const override { return next_read_; } |
| 130 | |
| 131 | bool HadError() const override { return false; } |
| 132 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 133 | private: |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 134 | DISALLOW_COPY_AND_ASSIGN(MmappedData); |
| 135 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 136 | android::FileMap map_; |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 137 | size_t next_read_ = 0; |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 138 | }; |
| 139 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 140 | // Implementation of IData that exposes a block of memory that was malloc'ed (new'ed). |
| 141 | // The memory is owned by this object. |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 142 | class MallocData : public IData { |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 143 | public: |
| 144 | MallocData(std::unique_ptr<const uint8_t[]> data, size_t size) |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 145 | : data_(std::move(data)), size_(size) {} |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 146 | virtual ~MallocData() = default; |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 147 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 148 | const void* data() const override { return data_.get(); } |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 149 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 150 | size_t size() const override { return size_; } |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 151 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 152 | bool Next(const void** data, size_t* size) override { |
| 153 | if (next_read_ == size_) { |
| 154 | return false; |
| 155 | } |
| 156 | *data = data_.get() + next_read_; |
| 157 | *size = size_ - next_read_; |
| 158 | next_read_ = size_; |
| 159 | return true; |
| 160 | } |
| 161 | |
| 162 | void BackUp(size_t count) override { |
| 163 | if (count > next_read_) { |
| 164 | next_read_ = 0; |
| 165 | } else { |
| 166 | next_read_ -= count; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | bool CanRewind() const override { return true; } |
| 171 | |
| 172 | bool Rewind() override { |
| 173 | next_read_ = 0; |
| 174 | return true; |
| 175 | } |
| 176 | |
| 177 | size_t ByteCount() const override { return next_read_; } |
| 178 | |
| 179 | bool HadError() const override { return false; } |
| 180 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 181 | private: |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 182 | DISALLOW_COPY_AND_ASSIGN(MallocData); |
| 183 | |
Adam Lesinski | ce5e56e | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 184 | std::unique_ptr<const uint8_t[]> data_; |
| 185 | size_t size_; |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 186 | size_t next_read_ = 0; |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 187 | }; |
| 188 | |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 189 | // When mmap fails because the file has length 0, we use the EmptyData to simulate data of length 0. |
Adam Lesinski | 52364f7 | 2016-01-11 13:10:24 -0800 | [diff] [blame] | 190 | class EmptyData : public IData { |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 191 | public: |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 192 | virtual ~EmptyData() = default; |
| 193 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 194 | const void* data() const override { |
| 195 | static const uint8_t d = 0; |
| 196 | return &d; |
| 197 | } |
Adam Lesinski | 52364f7 | 2016-01-11 13:10:24 -0800 | [diff] [blame] | 198 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 199 | size_t size() const override { return 0u; } |
Adam Lesinski | 06460ef | 2017-03-14 18:52:13 -0700 | [diff] [blame] | 200 | |
| 201 | bool Next(const void** /*data*/, size_t* /*size*/) override { return false; } |
| 202 | |
| 203 | void BackUp(size_t /*count*/) override {} |
| 204 | |
| 205 | bool CanRewind() const override { return true; } |
| 206 | |
| 207 | bool Rewind() override { return true; } |
| 208 | |
| 209 | size_t ByteCount() const override { return 0u; } |
| 210 | |
| 211 | bool HadError() const override { return false; } |
Adam Lesinski | 52364f7 | 2016-01-11 13:10:24 -0800 | [diff] [blame] | 212 | }; |
| 213 | |
Adam Lesinski | cacb28f | 2016-10-19 12:18:14 -0700 | [diff] [blame] | 214 | } // namespace io |
| 215 | } // namespace aapt |
Adam Lesinski | a40e972 | 2015-11-24 19:11:46 -0800 | [diff] [blame] | 216 | |
| 217 | #endif /* AAPT_IO_DATA_H */ |