transmission/libtransmission/torrent-files.h

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// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <algorithm> // std::sort()
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#include <cstddef>
#include <cstdint> // uint64_t
#include <functional>
#include <iterator>
#include <optional>
#include <string>
#include <string_view>
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#include <utility>
#include <vector>
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#include "libtransmission/transmission.h"
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#include "libtransmission/file.h"
#include "libtransmission/tr-macros.h"
#include "libtransmission/tr-strbuf.h"
struct tr_error;
/**
* A simple collection of files & utils for finding them, moving them, etc.
*/
struct tr_torrent_files
{
public:
[[nodiscard]] TR_CONSTEXPR20 bool empty() const noexcept
{
return std::empty(files_);
}
[[nodiscard]] TR_CONSTEXPR20 size_t fileCount() const noexcept
{
return std::size(files_);
}
[[nodiscard]] TR_CONSTEXPR20 uint64_t fileSize(tr_file_index_t file_index) const
{
return files_.at(file_index).size_;
}
[[nodiscard]] constexpr auto totalSize() const noexcept
{
return total_size_;
}
[[nodiscard]] TR_CONSTEXPR20 std::string const& path(tr_file_index_t file_index) const
{
return files_.at(file_index).path_;
}
void setPath(tr_file_index_t file_index, std::string_view path)
{
files_.at(file_index).setPath(path);
}
void insertSubpathPrefix(std::string_view path)
{
auto const buf = tr_pathbuf{ path, '/' };
for (auto& file : files_)
{
file.path_.insert(0, buf.sv());
file.path_.shrink_to_fit();
}
}
void reserve(size_t n_files)
{
files_.reserve(n_files);
}
void shrinkToFit()
{
files_.shrink_to_fit();
}
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TR_CONSTEXPR20 void clear() noexcept
{
files_.clear();
total_size_ = uint64_t{};
}
[[nodiscard]] auto sortedByPath() const
{
auto ret = std::vector<std::pair<std::string /*path*/, uint64_t /*size*/>>{};
ret.reserve(std::size(files_));
std::transform(
std::begin(files_),
std::end(files_),
std::back_inserter(ret),
[](auto const& in) { return std::make_pair(in.path_, in.size_); });
std::sort(std::begin(ret), std::end(ret), [](auto const& lhs, auto const& rhs) { return lhs.first < rhs.first; });
return ret;
}
tr_file_index_t add(std::string_view path, uint64_t file_size)
{
auto const ret = static_cast<tr_file_index_t>(std::size(files_));
files_.emplace_back(path, file_size);
total_size_ += file_size;
return ret;
}
bool move(
std::string_view old_parent_in,
std::string_view parent_in,
std::string_view parent_name = "",
tr_error* error = nullptr) const;
using FileFunc = std::function<void(char const* filename)>;
void remove(std::string_view parent_in, std::string_view tmpdir_prefix, FileFunc const& func) const;
struct FoundFile : public tr_sys_path_info
{
public:
FoundFile(tr_sys_path_info info, tr_pathbuf&& filename_in, size_t base_len_in)
: tr_sys_path_info{ info }
, filename_{ std::move(filename_in) }
, base_len_{ base_len_in }
{
}
[[nodiscard]] constexpr auto const& filename() const noexcept
{
// /home/foo/Downloads/torrent/01-file-one.txt
return filename_;
}
[[nodiscard]] constexpr auto base() const noexcept
{
// /home/foo/Downloads
return filename_.sv().substr(0, base_len_);
}
[[nodiscard]] constexpr auto subpath() const noexcept
{
// torrent/01-file-one.txt
return filename_.sv().substr(base_len_ + 1);
}
private:
tr_pathbuf filename_;
size_t base_len_;
};
[[nodiscard]] std::optional<FoundFile> find(tr_file_index_t file, std::string_view const* paths, size_t n_paths) const;
[[nodiscard]] bool hasAnyLocalData(std::string_view const* paths, size_t n_paths) const;
static void makeSubpathPortable(std::string_view path, tr_pathbuf& append_me);
[[nodiscard]] static auto makeSubpathPortable(std::string_view path)
{
auto tmp = tr_pathbuf{};
makeSubpathPortable(path, tmp);
return std::string{ tmp.sv() };
}
[[nodiscard]] static bool isSubpathPortable(std::string_view path)
{
return makeSubpathPortable(path) == path;
}
static constexpr std::string_view PartialFileSuffix = ".part";
private:
struct file_t
{
public:
void setPath(std::string_view subpath)
{
if (path_ != subpath)
{
path_ = subpath;
path_.shrink_to_fit();
}
}
file_t(std::string_view path, uint64_t size)
: path_{ path }
, size_{ size }
{
}
std::string path_;
uint64_t size_ = 0;
};
std::vector<file_t> files_;
uint64_t total_size_ = 0;
};