fix example of custom storage
This commit is contained in:
arvidn
Arvid Norberg
parent
e08dc0b21d
commit
f67fb0850f
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@ -2,6 +2,7 @@ project(libtorrent-examples)
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set(single_file_examples
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simple_client
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custom_storage
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stats_counters
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dump_torrent
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make_torrent
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@ -18,6 +18,7 @@ project client_test
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# C4268: 'identifier' : 'const' static/global data initialized
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# with compiler generated default constructor fills the object with zeros
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<toolset>msvc:<cflags>/wd4268
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<toolset>msvc:<cflags>/wd4373
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: default-build
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<link>static
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;
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@ -25,6 +26,7 @@ project client_test
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exe client_test : client_test.cpp print.cpp torrent_view.cpp session_view.cpp ;
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exe simple_client : simple_client.cpp ;
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exe custom_storage : custom_storage.cpp ;
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exe bt-get : bt-get.cpp ;
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exe bt-get2 : bt-get2.cpp ;
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exe stats_counters : stats_counters.cpp ;
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@ -4,6 +4,7 @@ example_programs = \
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dump_torrent \
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make_torrent \
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simple_client \
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custom_storage \
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upnp_test \
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bt_get \
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bt_get2 \
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@ -23,6 +24,7 @@ bt_get2_SOURCES = bt-get2.cpp
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dump_torrent_SOURCES = dump_torrent.cpp
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make_torrent_SOURCES = make_torrent.cpp
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simple_client_SOURCES = simple_client.cpp
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custom_storage_SOURCES = custom_storage.cpp
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connection_tester_SOURCES = connection_tester.cpp
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upnp_test_SOURCES = upnp_test.cpp
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@ -0,0 +1,125 @@
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/*
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Copyright (c) 2019, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <cstdlib>
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#include "libtorrent/entry.hpp"
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#include "libtorrent/bencode.hpp"
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#include "libtorrent/session.hpp"
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#include "libtorrent/torrent_info.hpp"
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#include "libtorrent/fwd.hpp"
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#include <iostream>
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// -- example begin
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struct temp_storage : lt::storage_interface
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{
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explicit temp_storage(lt::file_storage const& fs) : lt::storage_interface(fs) {}
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void initialize(lt::storage_error&) override {}
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bool has_any_file(lt::storage_error&) override { return false; }
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virtual void set_file_priority(lt::aux::vector<lt::download_priority_t, lt::file_index_t>&
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, lt::storage_error&) override {}
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int readv(lt::span<lt::iovec_t const> bufs, lt::piece_index_t piece
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, int offset, lt::open_mode_t, lt::storage_error&) override
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{
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auto const i = m_file_data.find(piece);
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if (i == m_file_data.end()) return 0;
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if (int(i->second.size()) <= offset) return 0;
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lt::iovec_t data{ i->second.data() + offset, int(i->second.size() - offset) };
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int ret = 0;
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for (lt::iovec_t const& b : bufs) {
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int const to_copy = std::min(int(b.size()), int(data.size()));
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memcpy(b.data(), data.data(), to_copy);
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data = data.subspan(to_copy);
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ret += to_copy;
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if (data.empty()) break;
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}
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return ret;
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}
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int writev(lt::span<lt::iovec_t const> bufs
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, lt::piece_index_t const piece, int offset, lt::open_mode_t, lt::storage_error&) override
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{
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auto& data = m_file_data[piece];
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int ret = 0;
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for (auto& b : bufs) {
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if (int(data.size()) < offset + b.size()) data.resize(offset + b.size());
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std::memcpy(data.data() + offset, b.data(), b.size());
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offset += int(b.size());
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ret += int(b.size());
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}
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return ret;
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}
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void rename_file(lt::file_index_t, std::string const&, lt::storage_error&) override
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{ assert(false); }
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lt::status_t move_storage(std::string const&
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, lt::move_flags_t, lt::storage_error&) override { return lt::status_t::no_error; }
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bool verify_resume_data(lt::add_torrent_params const&
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, lt::aux::vector<std::string, lt::file_index_t> const&
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, lt::storage_error&) override
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{ return false; }
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void release_files(lt::storage_error&) override {}
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void delete_files(lt::remove_flags_t, lt::storage_error&) override {}
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std::map<lt::piece_index_t, std::vector<char>> m_file_data;
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};
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lt::storage_interface* temp_storage_constructor(lt::storage_params const& params, lt::file_pool&)
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{
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return new temp_storage(params.files);
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}
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// -- example end
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int main(int argc, char* argv[]) try
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{
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if (argc != 2) {
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std::cerr << "usage: ./custom_storage torrent-file\n"
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"to stop the client, press return.\n";
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return 1;
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}
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lt::session s;
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lt::add_torrent_params p;
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p.storage = temp_storage_constructor;
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p.save_path = "./";
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p.ti = std::make_shared<lt::torrent_info>(argv[1]);
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s.add_torrent(p);
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// wait for the user to end
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char a;
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int ret = std::scanf("%c\n", &a);
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(void)ret; // ignore
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return 0;
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}
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catch (std::exception const& e) {
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std::cerr << "ERROR: " << e.what() << "\n";
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}
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@ -67,64 +67,11 @@ POSSIBILITY OF SUCH DAMAGE.
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// ``std::map``, i.e. in RAM. It's not necessarily very useful in practice, but
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// illustrates the basics of implementing a custom storage.
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//
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// .. code:: c++
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//
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// struct temp_storage : storage_interface
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// {
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// temp_storage(file_storage const& fs) : storage_interface(fs) {}
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// bool initialize(storage_error& se) override { return false; }
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// bool has_any_file() override { return false; }
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// int read(char* buf, int piece, int offset, int size) override
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// {
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// std::map<int, std::vector<char>>::const_iterator i = m_file_data.find(piece);
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// if (i == m_file_data.end()) return 0;
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// int available = i->second.size() - offset;
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// if (available <= 0) return 0;
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// if (available > size) available = size;
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// memcpy(buf, &i->second[offset], available);
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// return available;
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// }
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// int write(const char* buf, int piece, int offset, int size) override
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// {
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// std::vector<char>& data = m_file_data[piece];
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// if (data.size() < offset + size) data.resize(offset + size);
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// std::memcpy(&data[offset], buf, size);
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// return size;
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// }
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// bool rename_file(file_index_t file, std::string const& new_name) override
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// { assert(false); return false; }
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// status_t move_storage(std::string const& save_path) override { return false; }
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// bool verify_resume_data(add_torrent_params const& rd
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// , std::vector<std::string> const* links
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// , storage_error& error) override { return false; }
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// std::int64_t physical_offset(int piece, int offset) override
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// { return piece * files().piece_length() + offset; };
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// sha1_hash hash_for_slot(int piece, partial_hash& ph, int piece_size) override
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// {
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// int left = piece_size - ph.offset;
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// assert(left >= 0);
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// if (left > 0)
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// {
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// std::vector<char>& data = m_file_data[piece];
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// // if there are padding files, those blocks will be considered
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// // completed even though they haven't been written to the storage.
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// // in this case, just extend the piece buffer to its full size
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// // and fill it with zeros.
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// if (data.size() < piece_size) data.resize(piece_size, 0);
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// ph.h.update(&data[ph.offset], left);
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// }
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// return ph.h.final();
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// }
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// bool release_files() override { return false; }
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// bool delete_files() override { return false; }
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//
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// std::map<int, std::vector<char>> m_file_data;
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// };
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//
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// storage_interface* temp_storage_constructor(storage_params const& params)
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// {
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// return new temp_storage(*params.files);
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// }
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// .. include:: ../examples/custom_storage.cpp
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// :code: c++
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// :tab-width: 2
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// :start-after: -- example begin
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// :end-before: // -- example end
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namespace libtorrent {
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namespace aux { struct session_settings; }
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