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https://github.com/robbert-vdh/yabridge.git
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Robbert van der Helm
108 lines
3.9 KiB
C++
108 lines
3.9 KiB
C++
// yabridge: a Wine VST bridge
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// Copyright (C) 2020 Robbert van der Helm
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#include "communication.h"
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#include <random>
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#include "utils.h"
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namespace fs = boost::filesystem;
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/**
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* Used for generating random identifiers.
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*/
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constexpr char alphanumeric_characters[] =
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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EventPayload DefaultDataConverter::read(const int /*opcode*/,
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const int /*index*/,
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const intptr_t /*value*/,
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const void* data) const {
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if (!data) {
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return nullptr;
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}
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// This is a simple fallback that will work in almost every case.
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// Because some plugins don't zero out their string buffers when sending
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// host callbacks, we will explicitely list all callbacks that expect a
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// string in `DispatchDataConverter` adn `HostCallbackDataConverter`.
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const char* c_string = static_cast<const char*>(data);
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if (c_string[0] != 0) {
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return std::string(c_string);
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} else {
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return WantsString{};
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}
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}
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std::optional<EventPayload> DefaultDataConverter::read_value(
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const int /*opcode*/,
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const intptr_t /*value*/) const {
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return std::nullopt;
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}
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void DefaultDataConverter::write(const int /*opcode*/,
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void* data,
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const EventResult& response) const {
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// The default behavior is to handle this as a null terminated C-style
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// string
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std::visit(overload{[&](const auto&) {},
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[&](const std::string& s) {
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char* output = static_cast<char*>(data);
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// We use std::string for easy transport but in
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// practice we're always writing null terminated
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// C-style strings
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std::copy(s.begin(), s.end(), output);
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output[s.size()] = 0;
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}},
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response.payload);
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}
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void DefaultDataConverter::write_value(const int /*opcode*/,
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intptr_t /*value*/,
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const EventResult& /*response*/) const {}
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intptr_t DefaultDataConverter::return_value(const int /*opcode*/,
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const intptr_t original) const {
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return original;
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}
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boost::filesystem::path generate_endpoint_base(const std::string& plugin_name) {
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fs::path temp_directory = get_temporary_directory();
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std::random_device random_device;
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std::mt19937 rng(random_device());
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fs::path candidate_endpoint;
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do {
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std::string random_id;
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std::sample(
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alphanumeric_characters,
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alphanumeric_characters + strlen(alphanumeric_characters) - 1,
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std::back_inserter(random_id), 8, rng);
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// We'll get rid of the file descriptors immediately after accepting the
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// sockets, so putting them inside of a subdirectory would only leave
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// behind an empty directory
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std::ostringstream socket_name;
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socket_name << "yabridge-" << plugin_name << "-" << random_id;
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candidate_endpoint = temp_directory / socket_name.str();
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} while (fs::exists(candidate_endpoint));
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return candidate_endpoint;
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}
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