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[C++] Split flatbuffers.h into separate files (#6868)
* split flatbuffers.h into separate files * wrong variable in cmakelists for android * readded two accidentally deleted includes * created buffer.h and moved buffer related things over
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| #ifndef FLATBUFFERS_ALLOCATOR_H_ | ||
| #define FLATBUFFERS_ALLOCATOR_H_ | ||
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| #include "flatbuffers/base.h" | ||
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| namespace flatbuffers { | ||
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| // Allocator interface. This is flatbuffers-specific and meant only for | ||
| // `vector_downward` usage. | ||
| class Allocator { | ||
| public: | ||
| virtual ~Allocator() {} | ||
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| // Allocate `size` bytes of memory. | ||
| virtual uint8_t *allocate(size_t size) = 0; | ||
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| // Deallocate `size` bytes of memory at `p` allocated by this allocator. | ||
| virtual void deallocate(uint8_t *p, size_t size) = 0; | ||
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| // Reallocate `new_size` bytes of memory, replacing the old region of size | ||
| // `old_size` at `p`. In contrast to a normal realloc, this grows downwards, | ||
| // and is intended specifcally for `vector_downward` use. | ||
| // `in_use_back` and `in_use_front` indicate how much of `old_size` is | ||
| // actually in use at each end, and needs to be copied. | ||
| virtual uint8_t *reallocate_downward(uint8_t *old_p, size_t old_size, | ||
| size_t new_size, size_t in_use_back, | ||
| size_t in_use_front) { | ||
| FLATBUFFERS_ASSERT(new_size > old_size); // vector_downward only grows | ||
| uint8_t *new_p = allocate(new_size); | ||
| memcpy_downward(old_p, old_size, new_p, new_size, in_use_back, | ||
| in_use_front); | ||
| deallocate(old_p, old_size); | ||
| return new_p; | ||
| } | ||
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| protected: | ||
| // Called by `reallocate_downward` to copy memory from `old_p` of `old_size` | ||
| // to `new_p` of `new_size`. Only memory of size `in_use_front` and | ||
| // `in_use_back` will be copied from the front and back of the old memory | ||
| // allocation. | ||
| void memcpy_downward(uint8_t *old_p, size_t old_size, uint8_t *new_p, | ||
| size_t new_size, size_t in_use_back, | ||
| size_t in_use_front) { | ||
| memcpy(new_p + new_size - in_use_back, old_p + old_size - in_use_back, | ||
| in_use_back); | ||
| memcpy(new_p, old_p, in_use_front); | ||
| } | ||
| }; | ||
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| } // namespace flatbuffers | ||
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| #endif // FLATBUFFERS_ALLOCATOR_H_ |
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