mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Andrei Shikov
aaff15c2c8
Summary: Replaces raw array pointer inside `MapBuffer` with `std::vector`, which is more conventional "safer" way of storing dynamically sized arrays. Changelog: [Internal] Reviewed By: mdvacca Differential Revision: D33512115 fbshipit-source-id: d875a2240f7938fd35c4c3ae0e7e91dc7456ff32
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <react/debug/react_native_assert.h>
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#include <react/renderer/mapbuffer/primitives.h>
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#include <limits>
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namespace facebook {
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namespace react {
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/**
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* MapBuffer is an optimized map format for transferring data like props between
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* C++ and other platforms The implementation of this map is optimized to:
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* - be compact to optimize space when sparse (sparse is the common case).
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* - be accessible through JNI with zero/minimal copying via ByteBuffer.
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* - be Have excellent C++ single-write and many-read performance by maximizing
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* CPU cache performance through compactness, data locality, and fixed offsets
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* where possible.
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* - be optimized for iteration and intersection against other maps, but with
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* reasonably good random access as well.
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* - Work recursively for nested maps/arrays.
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* - Supports dynamic types that map to JSON.
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* - Don't require mutability - single-write on creation.
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* - have minimal APK size and build time impact.
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*/
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class MapBuffer {
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private:
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// Buffer and its size
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std::vector<uint8_t> const bytes_;
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// amount of items in the MapBuffer
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uint16_t count_ = 0;
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// returns the relative offset of the first byte of dynamic data
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int32_t getDynamicDataOffset() const;
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public:
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explicit MapBuffer(std::vector<uint8_t> data);
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MapBuffer(MapBuffer const &buffer) = delete;
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MapBuffer &operator=(MapBuffer other) = delete;
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MapBuffer(MapBuffer &&buffer) = default;
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int32_t getInt(Key key) const;
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bool getBool(Key key) const;
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double getDouble(Key key) const;
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std::string getString(Key key) const;
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// TODO T83483191: review this declaration
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MapBuffer getMapBuffer(Key key) const;
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int32_t getBufferSize() const;
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// TODO T83483191: review parameters of copy method
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void copy(uint8_t *output) const;
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bool isNull(Key key) const;
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uint16_t getCount() const;
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};
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} // namespace react
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} // namespace facebook
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