Tomasz Wiszkowski | a449e9c | 2017-05-25 14:30:56 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | #ifndef CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_ |
| 17 | #define CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_ |
| 18 | |
| 19 | #include <stdarg.h> |
| 20 | #include <stdio.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | #include <pthread.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/stat.h> |
| 26 | |
| 27 | template <typename T, size_t N> |
| 28 | char (&ArraySizeHelper(T (&array)[N]))[N]; |
| 29 | |
| 30 | template <typename T, size_t N> |
| 31 | char (&ArraySizeHelper(const T (&array)[N]))[N]; |
| 32 | |
| 33 | #define arraysize(array) (sizeof(ArraySizeHelper(array))) |
| 34 | |
Tomasz Wiszkowski | a449e9c | 2017-05-25 14:30:56 -0700 | [diff] [blame] | 35 | // In C++11 this is just std::vector<char>, but Android isn't |
| 36 | // there yet. |
| 37 | class AutoFreeBuffer { |
| 38 | public: |
| 39 | enum { |
| 40 | // Minimum reserve size of AutoFreeBuffer to consider shrinking reservation. |
| 41 | // Any buffer shorter than this will not be shrunk. |
| 42 | kAutoBufferShrinkReserveThreshold = 8192 |
| 43 | }; |
| 44 | |
| 45 | AutoFreeBuffer() |
| 46 | : data_(NULL), size_(0), reserve_size_(0) {} |
| 47 | |
| 48 | AutoFreeBuffer(size_t reserve_size) |
| 49 | : data_(NULL), size_(0), reserve_size_(0) { |
| 50 | Reserve(reserve_size); |
| 51 | } |
| 52 | |
| 53 | ~AutoFreeBuffer(); |
| 54 | void Clear(); |
| 55 | bool Resize(size_t newsize); |
| 56 | bool Reserve(size_t newsize); |
| 57 | bool SetToString(const char* in); |
| 58 | bool Append(const void* new_data, size_t new_data_size); |
| 59 | size_t PrintF(const char* format, ... ); |
| 60 | |
| 61 | char* data() { |
| 62 | return data_; |
| 63 | } |
| 64 | |
| 65 | const char* data() const { |
| 66 | return data_; |
| 67 | } |
| 68 | |
| 69 | char* begin() { |
| 70 | return data_; |
| 71 | } |
| 72 | |
| 73 | const char* begin() const { |
| 74 | return data_; |
| 75 | } |
| 76 | |
| 77 | char* end() { |
| 78 | return data_ + size_; |
| 79 | } |
| 80 | |
| 81 | const char* end() const { |
| 82 | return data_ + size_; |
| 83 | } |
| 84 | |
| 85 | size_t size() const { |
| 86 | return size_; |
| 87 | } |
| 88 | |
| 89 | size_t reserve_size() const { |
| 90 | return reserve_size_; |
| 91 | } |
| 92 | |
| 93 | void Swap(AutoFreeBuffer& other) { |
| 94 | char* temp_ptr = data_; |
| 95 | data_ = other.data_; |
| 96 | other.data_ = temp_ptr; |
| 97 | |
| 98 | size_t temp_size = size_; |
| 99 | size_ = other.size_; |
| 100 | other.size_ = temp_size; |
| 101 | |
| 102 | temp_size = reserve_size_; |
| 103 | reserve_size_ = other.reserve_size_; |
| 104 | other.reserve_size_ = temp_size; |
| 105 | } |
| 106 | |
| 107 | bool operator==(const AutoFreeBuffer& other) const { |
| 108 | return (size_ == other.size_) && !memcmp(data_, other.data_, size_); |
| 109 | } |
| 110 | |
| 111 | bool operator!=(const AutoFreeBuffer& other) const { |
| 112 | return !(*this == other); |
| 113 | } |
| 114 | |
| 115 | protected: |
| 116 | char *data_; |
| 117 | size_t size_; |
| 118 | size_t reserve_size_; |
| 119 | |
| 120 | private: |
| 121 | AutoFreeBuffer& operator=(const AutoFreeBuffer&); |
| 122 | explicit AutoFreeBuffer(const AutoFreeBuffer&); |
| 123 | }; |
Tomasz Wiszkowski | a449e9c | 2017-05-25 14:30:56 -0700 | [diff] [blame] | 124 | #endif // CUTTLEFISH_COMMON_COMMON_LIBS_AUTO_RESOURCES_AUTO_RESOURCES_H_ |