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/*
Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file src/lib/file_group.h
* @brief FileGroup class.
*/
#ifndef DCPOMATIC_FILE_GROUP_H
#define DCPOMATIC_FILE_GROUP_H
#include <dcp/file.h>
#include <boost/filesystem.hpp>
#include <boost/optional.hpp>
#include <vector>
/** @class FileGroup
* @brief A class to make a list of files behave like they were concatenated.
*/
class FileGroup
{
public:
FileGroup ();
explicit FileGroup (boost::filesystem::path);
explicit FileGroup (std::vector<boost::filesystem::path> const &);
FileGroup (FileGroup const&) = delete;
FileGroup& operator= (FileGroup const&) = delete;
void set_paths (std::vector<boost::filesystem::path> const &);
struct Result {
Result(int bytes_read_, bool eof_)
: bytes_read(bytes_read_)
, eof(eof_)
{}
int bytes_read = 0;
bool eof = false;
};
int64_t seek (int64_t, int) const;
Result read (uint8_t*, int) const;
int64_t length () const;
private:
void ensure_open_path (size_t) const;
std::vector<boost::filesystem::path> _paths;
/** Index of path that we are currently reading from */
mutable size_t _current_path = 0;
mutable boost::optional<dcp::File> _current_file;
mutable size_t _current_size = 0;
mutable int64_t _position = 0;
};
#endif
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