Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -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 | |
Jeremy Meyer | 56f36e8 | 2022-05-20 20:35:42 +0000 | [diff] [blame] | 17 | #include <androidfw/BigBuffer.h> |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 18 | |
| 19 | #include <algorithm> |
Yurii Zubrytskyi | 707263e | 2024-08-09 10:47:08 -0700 | [diff] [blame] | 20 | #include <iterator> |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 21 | #include <memory> |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 22 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 23 | #include "android-base/logging.h" |
| 24 | |
Jeremy Meyer | 56f36e8 | 2022-05-20 20:35:42 +0000 | [diff] [blame] | 25 | namespace android { |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 26 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 27 | void* BigBuffer::NextBlockImpl(size_t size) { |
| 28 | if (!blocks_.empty()) { |
| 29 | Block& block = blocks_.back(); |
| 30 | if (block.block_size_ - block.size >= size) { |
| 31 | void* out_buffer = block.buffer.get() + block.size; |
| 32 | block.size += size; |
| 33 | size_ += size; |
| 34 | return out_buffer; |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 35 | } |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 36 | } |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 37 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 38 | const size_t actual_size = std::max(block_size_, size); |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 39 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 40 | Block block = {}; |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 41 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 42 | // Zero-allocate the block's buffer. |
| 43 | block.buffer = std::unique_ptr<uint8_t[]>(new uint8_t[actual_size]()); |
| 44 | CHECK(block.buffer); |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 45 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 46 | block.size = size; |
| 47 | block.block_size_ = actual_size; |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 48 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 49 | blocks_.push_back(std::move(block)); |
| 50 | size_ += size; |
| 51 | return blocks_.back().buffer.get(); |
Adam Lesinski | 6f6ceb7 | 2014-11-14 14:48:12 -0800 | [diff] [blame] | 52 | } |
| 53 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 54 | void* BigBuffer::NextBlock(size_t* out_size) { |
| 55 | if (!blocks_.empty()) { |
| 56 | Block& block = blocks_.back(); |
| 57 | if (block.size != block.block_size_) { |
| 58 | void* out_buffer = block.buffer.get() + block.size; |
| 59 | size_t size = block.block_size_ - block.size; |
| 60 | block.size = block.block_size_; |
| 61 | size_ += size; |
| 62 | *out_size = size; |
| 63 | return out_buffer; |
Adam Lesinski | 21efb68 | 2016-09-14 17:35:43 -0700 | [diff] [blame] | 64 | } |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 65 | } |
Adam Lesinski | 21efb68 | 2016-09-14 17:35:43 -0700 | [diff] [blame] | 66 | |
Adam Lesinski | ce5e56e2 | 2016-10-21 17:56:45 -0700 | [diff] [blame] | 67 | // Zero-allocate the block's buffer. |
| 68 | Block block = {}; |
| 69 | block.buffer = std::unique_ptr<uint8_t[]>(new uint8_t[block_size_]()); |
| 70 | CHECK(block.buffer); |
| 71 | block.size = block_size_; |
| 72 | block.block_size_ = block_size_; |
| 73 | blocks_.push_back(std::move(block)); |
| 74 | size_ += block_size_; |
| 75 | *out_size = block_size_; |
| 76 | return blocks_.back().buffer.get(); |
Adam Lesinski | 21efb68 | 2016-09-14 17:35:43 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Adam Lesinski | c8f71aa | 2017-02-08 07:03:50 -0800 | [diff] [blame] | 79 | std::string BigBuffer::to_string() const { |
| 80 | std::string result; |
Yurii Zubrytskyi | 707263e | 2024-08-09 10:47:08 -0700 | [diff] [blame] | 81 | result.reserve(size_); |
Adam Lesinski | c8f71aa | 2017-02-08 07:03:50 -0800 | [diff] [blame] | 82 | for (const Block& block : blocks_) { |
| 83 | result.append(block.buffer.get(), block.buffer.get() + block.size); |
| 84 | } |
| 85 | return result; |
| 86 | } |
| 87 | |
Yurii Zubrytskyi | 707263e | 2024-08-09 10:47:08 -0700 | [diff] [blame] | 88 | void BigBuffer::AppendBuffer(BigBuffer&& buffer) { |
| 89 | std::move(buffer.blocks_.begin(), buffer.blocks_.end(), std::back_inserter(blocks_)); |
| 90 | size_ += buffer.size_; |
| 91 | buffer.blocks_.clear(); |
| 92 | buffer.size_ = 0; |
| 93 | } |
| 94 | |
| 95 | void BigBuffer::BackUp(size_t count) { |
| 96 | Block& block = blocks_.back(); |
| 97 | block.size -= count; |
| 98 | size_ -= count; |
| 99 | // BigBuffer is supposed to always give zeroed memory, but backing up usually means |
| 100 | // something has been already written into the block. Erase it. |
| 101 | std::fill_n(block.buffer.get() + block.size, count, 0); |
| 102 | } |
| 103 | |
Jeremy Meyer | 56f36e8 | 2022-05-20 20:35:42 +0000 | [diff] [blame] | 104 | } // namespace android |