mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
David Vacca
91b3f5d48a
Summary: This diff contains the code from the 35 diff stack - D27210587 This diff implement and integrates Mapbuffer into Fabric text measure system changelog: [internal] internal Reviewed By: JoshuaGross Differential Revision: D27241836 fbshipit-source-id: f40a780df0723f27da440f709a8676cfcca63953
93 lines
2.5 KiB
C++
93 lines
2.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its 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 <glog/logging.h>
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// TODO: Enable CHECK_CONSISTENCY only in debug mode or test environments (or
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// just in demand)
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// #define CHECK_CONSISTENCY 1
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constexpr static int NULL_VALUE = 0;
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// Value used to verify if the data is serialized with LittleEndian order
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constexpr static uint16_t ALIGNMENT = 0xFE;
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using Key = uint16_t;
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using Byte = uint8_t;
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namespace facebook {
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namespace react {
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struct Header {
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uint16_t alignment; // alignment of serialization
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uint16_t count; // amount of items in the map
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uint16_t bufferSize; // Amount of bytes used to store the map in memory
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};
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constexpr static int KEY_SIZE = sizeof(Key);
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constexpr static int HEADER_SIZE = sizeof(Header);
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constexpr static int INT_SIZE = sizeof(int);
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constexpr static int DOUBLE_SIZE = sizeof(double);
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constexpr static int UINT8_SIZE = sizeof(uint8_t);
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constexpr static int UINT16_SIZE = sizeof(uint16_t);
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constexpr static int UINT64_SIZE = sizeof(uint64_t);
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constexpr static int HEADER_ALIGNMENT_OFFSET = 0;
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constexpr static int HEADER_COUNT_OFFSET = UINT16_SIZE;
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constexpr static int HEADER_BUFFER_SIZE_OFFSET = UINT16_SIZE * 2;
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constexpr static int MAX_VALUE_SIZE = UINT64_SIZE;
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// 10 bytes : 2 key + 8 value
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constexpr static int BUCKET_SIZE = KEY_SIZE + UINT64_SIZE;
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/**
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* Returns the offset of the key received by parameter.
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*/
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inline int getKeyOffset(Key key) {
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return HEADER_SIZE + BUCKET_SIZE * key;
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}
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/**
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* Returns the offset of the value associated to the key received by parameter.
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*/
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inline int getValueOffset(Key key) {
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return getKeyOffset(key) + KEY_SIZE;
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}
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static inline const char *getCstring(const std::string *str) {
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return str ? str->c_str() : "";
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}
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inline void
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checkKeyConsistency(const Header &header, const uint8_t *data, Key key) {
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#ifdef CHECK_CONSISTENCY
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if (key >= header.count) {
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LOG(ERROR) << "Error: Key is higher than size of Map - key '" << key
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<< "' - size: '" << header.count << "'";
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assert(false && "Error while reading key");
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}
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Key storedKey = 0;
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memcpy(
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reinterpret_cast<Key *>(&storedKey),
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reinterpret_cast<const Key *>(data + getKeyOffset(key)),
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KEY_SIZE);
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if (storedKey != key) {
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LOG(ERROR) << "Error while reading key, expecting '" << key << "' found: '"
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<< storedKey << "'";
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assert(false && "Error while reading key");
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}
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#endif
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}
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} // namespace react
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} // namespace facebook
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