88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
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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/common.h"
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#include "td/utils/Status.h"
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namespace td {
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/*** PartsManager***/
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struct Part {
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int id;
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int64 offset;
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size_t size;
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};
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class PartsManager {
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public:
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Status init(int64 size, int64 expected_size, bool is_size_final, size_t part_size,
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const std::vector<int> &ready_parts, bool use_part_count_limit) TD_WARN_UNUSED_RESULT;
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bool ready();
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bool unchecked_ready();
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Status finish() TD_WARN_UNUSED_RESULT;
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// returns empty part if nothing to return
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Result<Part> start_part() TD_WARN_UNUSED_RESULT;
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Status on_part_ok(int32 id, size_t part_size, size_t actual_size) TD_WARN_UNUSED_RESULT;
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void on_part_failed(int32 id);
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Status set_known_prefix(size_t size, bool is_ready);
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void set_need_check();
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void set_checked_prefix_size(int64 size);
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int64 get_checked_prefix_size() const;
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int64 get_unchecked_ready_prefix_size();
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int64 get_size() const;
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int64 get_size_or_zero() const;
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int64 get_expected_size() const;
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int64 get_ready_size() const;
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size_t get_part_size() const;
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int32 get_part_count() const;
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int32 get_ready_prefix_count();
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private:
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static constexpr int MAX_PART_COUNT = 3000;
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static constexpr int MAX_PART_SIZE = 512 * (1 << 10);
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static constexpr int64 MAX_FILE_SIZE = MAX_PART_SIZE * MAX_PART_COUNT;
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enum class PartStatus : int32 { Empty, Pending, Ready };
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bool need_check_{false};
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int64 checked_prefix_size_{0};
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bool known_prefix_flag_{false};
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int64 known_prefix_size_;
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int64 size_;
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int64 expected_size_;
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int64 min_size_;
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int64 max_size_;
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bool unknown_size_flag_;
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int64 ready_size_;
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size_t part_size_;
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int part_count_;
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int pending_count_;
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int first_empty_part_;
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int first_not_ready_part_;
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vector<PartStatus> part_status_;
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bool use_part_count_limit_;
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void init_common(const vector<int> &ready_parts);
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Status init_known_prefix(int64 known_prefix, size_t part_size,
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const std::vector<int> &ready_parts) TD_WARN_UNUSED_RESULT;
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Status init_no_size(size_t part_size, const std::vector<int> &ready_parts) TD_WARN_UNUSED_RESULT;
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Part get_part(int id);
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Part get_empty_part();
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void on_part_start(int32 id);
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void update_first_empty_part();
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void update_first_not_ready_part();
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};
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} // namespace td
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