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 20#include <utils/FileMap.h> 21 22#include <memory> 23 24namespace aapt { 25namespace io { 26 27/** 28 * Interface for a block of contiguous memory. An instance of this interface owns the data. 29 */ 30class IData { 31public: 32 virtual ~IData() = default; 33 34 virtual const void* data() const = 0; 35 virtual size_t size() const = 0; 36}; 37 38/** 39 * Implementation of IData that exposes a memory mapped file. The mmapped file is owned by this 40 * object. 41 */ 42class MmappedData : public IData { 43public: 44 explicit MmappedData(android::FileMap&& map) : mMap(std::forward<android::FileMap>(map)) { 45 } 46 47 const void* data() const override { 48 return mMap.getDataPtr(); 49 } 50 51 size_t size() const override { 52 return mMap.getDataLength(); 53 } 54 55private: 56 android::FileMap mMap; 57}; 58 59/** 60 * Implementation of IData that exposes a block of memory that was malloc'ed (new'ed). The 61 * memory is owned by this object. 62 */ 63class MallocData : public IData { 64public: 65 MallocData(std::unique_ptr<const uint8_t[]> data, size_t size) : 66 mData(std::move(data)), mSize(size) { 67 } 68 69 const void* data() const override { 70 return mData.get(); 71 } 72 73 size_t size() const override { 74 return mSize; 75 } 76 77private: 78 std::unique_ptr<const uint8_t[]> mData; 79 size_t mSize; 80}; 81 82/** 83 * When mmap fails because the file has length 0, we use the EmptyData to simulate data of length 0. 84 */ 85class EmptyData : public IData { 86public: 87 const void* data() const override { 88 static const uint8_t d = 0; 89 return &d; 90 } 91 92 size_t size() const override { 93 return 0u; 94 } 95}; 96 97} // namespace io 98} // namespace aapt 99 100#endif /* AAPT_IO_DATA_H */ 101