89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/StorerBase.h"
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#include "td/utils/common.h"
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#include "td/utils/Slice.h"
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#include "td/utils/tl_storers.h"
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#include <cstring>
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#include <limits>
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namespace td {
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class SliceStorer : public Storer {
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Slice slice;
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public:
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explicit SliceStorer(Slice slice) : slice(slice) {
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}
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size_t size() const override {
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return slice.size();
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}
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size_t store(uint8 *ptr) const override {
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std::memcpy(ptr, slice.ubegin(), slice.size());
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return slice.size();
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}
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};
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inline SliceStorer create_storer(Slice slice) {
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return SliceStorer(slice);
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}
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class ConcatStorer : public Storer {
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const Storer &a_;
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const Storer &b_;
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public:
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ConcatStorer(const Storer &a, const Storer &b) : a_(a), b_(b) {
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}
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size_t size() const override {
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return a_.size() + b_.size();
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}
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size_t store(uint8 *ptr) const override {
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uint8 *ptr_save = ptr;
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ptr += a_.store(ptr);
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ptr += b_.store(ptr);
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return ptr - ptr_save;
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}
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};
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inline ConcatStorer create_storer(const Storer &a, const Storer &b) {
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return ConcatStorer(a, b);
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}
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template <class T>
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class DefaultStorer : public Storer {
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public:
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explicit DefaultStorer(const T &object) : object_(object) {
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}
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size_t size() const override {
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if (size_ == std::numeric_limits<size_t>::max()) {
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size_ = tl_calc_length(object_);
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}
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return size_;
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}
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size_t store(uint8 *ptr) const override {
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return tl_store_unsafe(object_, ptr);
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}
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private:
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mutable size_t size_ = std::numeric_limits<size_t>::max();
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const T &object_;
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};
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template <class T>
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DefaultStorer<T> create_default_storer(const T &from) {
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return DefaultStorer<T>(from);
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}
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} // namespace td
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