From 9d9141efac942fc87ed529a9f5c68ef96eb6d707 Mon Sep 17 00:00:00 2001 From: Taras Madan Date: Wed, 8 May 2024 12:18:24 +0200 Subject: executor: move flatbuffers from vendor to executor --- executor/_include/flatbuffers/table.h | 168 ++++++++++++++++++++++++++++++++++ 1 file changed, 168 insertions(+) create mode 100644 executor/_include/flatbuffers/table.h (limited to 'executor/_include/flatbuffers/table.h') diff --git a/executor/_include/flatbuffers/table.h b/executor/_include/flatbuffers/table.h new file mode 100644 index 000000000..11b292476 --- /dev/null +++ b/executor/_include/flatbuffers/table.h @@ -0,0 +1,168 @@ +/* + * Copyright 2021 Google Inc. All rights reserved. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef FLATBUFFERS_TABLE_H_ +#define FLATBUFFERS_TABLE_H_ + +#include "flatbuffers/base.h" +#include "flatbuffers/verifier.h" + +namespace flatbuffers { + +// "tables" use an offset table (possibly shared) that allows fields to be +// omitted and added at will, but uses an extra indirection to read. +class Table { + public: + const uint8_t *GetVTable() const { + return data_ - ReadScalar(data_); + } + + // This gets the field offset for any of the functions below it, or 0 + // if the field was not present. + voffset_t GetOptionalFieldOffset(voffset_t field) const { + // The vtable offset is always at the start. + auto vtable = GetVTable(); + // The first element is the size of the vtable (fields + type id + itself). + auto vtsize = ReadScalar(vtable); + // If the field we're accessing is outside the vtable, we're reading older + // data, so it's the same as if the offset was 0 (not present). + return field < vtsize ? ReadScalar(vtable + field) : 0; + } + + template T GetField(voffset_t field, T defaultval) const { + auto field_offset = GetOptionalFieldOffset(field); + return field_offset ? ReadScalar(data_ + field_offset) : defaultval; + } + + template P GetPointer(voffset_t field) { + auto field_offset = GetOptionalFieldOffset(field); + auto p = data_ + field_offset; + return field_offset ? reinterpret_cast

(p + ReadScalar(p)) + : nullptr; + } + template P GetPointer(voffset_t field) const { + return const_cast(this)->GetPointer

(field); + } + + template P GetStruct(voffset_t field) const { + auto field_offset = GetOptionalFieldOffset(field); + auto p = const_cast(data_ + field_offset); + return field_offset ? reinterpret_cast

(p) : nullptr; + } + + template + flatbuffers::Optional GetOptional(voffset_t field) const { + auto field_offset = GetOptionalFieldOffset(field); + auto p = data_ + field_offset; + return field_offset ? Optional(static_cast(ReadScalar(p))) + : Optional(); + } + + template bool SetField(voffset_t field, T val, T def) { + auto field_offset = GetOptionalFieldOffset(field); + if (!field_offset) return IsTheSameAs(val, def); + WriteScalar(data_ + field_offset, val); + return true; + } + template bool SetField(voffset_t field, T val) { + auto field_offset = GetOptionalFieldOffset(field); + if (!field_offset) return false; + WriteScalar(data_ + field_offset, val); + return true; + } + + bool SetPointer(voffset_t field, const uint8_t *val) { + auto field_offset = GetOptionalFieldOffset(field); + if (!field_offset) return false; + WriteScalar(data_ + field_offset, + static_cast(val - (data_ + field_offset))); + return true; + } + + uint8_t *GetAddressOf(voffset_t field) { + auto field_offset = GetOptionalFieldOffset(field); + return field_offset ? data_ + field_offset : nullptr; + } + const uint8_t *GetAddressOf(voffset_t field) const { + return const_cast

(this)->GetAddressOf(field); + } + + bool CheckField(voffset_t field) const { + return GetOptionalFieldOffset(field) != 0; + } + + // Verify the vtable of this table. + // Call this once per table, followed by VerifyField once per field. + bool VerifyTableStart(Verifier &verifier) const { + return verifier.VerifyTableStart(data_); + } + + // Verify a particular field. + template + bool VerifyField(const Verifier &verifier, voffset_t field, + size_t align) const { + // Calling GetOptionalFieldOffset should be safe now thanks to + // VerifyTable(). + auto field_offset = GetOptionalFieldOffset(field); + // Check the actual field. + return !field_offset || verifier.VerifyField(data_, field_offset, align); + } + + // VerifyField for required fields. + template + bool VerifyFieldRequired(const Verifier &verifier, voffset_t field, + size_t align) const { + auto field_offset = GetOptionalFieldOffset(field); + return verifier.Check(field_offset != 0) && + verifier.VerifyField(data_, field_offset, align); + } + + // Versions for offsets. + bool VerifyOffset(const Verifier &verifier, voffset_t field) const { + auto field_offset = GetOptionalFieldOffset(field); + return !field_offset || verifier.VerifyOffset(data_, field_offset); + } + + bool VerifyOffsetRequired(const Verifier &verifier, voffset_t field) const { + auto field_offset = GetOptionalFieldOffset(field); + return verifier.Check(field_offset != 0) && + verifier.VerifyOffset(data_, field_offset); + } + + private: + // private constructor & copy constructor: you obtain instances of this + // class by pointing to existing data only + Table(); + Table(const Table &other); + Table &operator=(const Table &); + + uint8_t data_[1]; +}; + +// This specialization allows avoiding warnings like: +// MSVC C4800: type: forcing value to bool 'true' or 'false'. +template<> +inline flatbuffers::Optional Table::GetOptional( + voffset_t field) const { + auto field_offset = GetOptionalFieldOffset(field); + auto p = data_ + field_offset; + return field_offset ? Optional(ReadScalar(p) != 0) + : Optional(); +} + +} // namespace flatbuffers + +#endif // FLATBUFFERS_TABLE_H_ -- cgit mrf-deployment