ArchiveFile.h

/*
╔══════════════════════════════════════════════════════════════════════════════╗
║                       SIMPLY POWERFUL TOOLKIT (SPTK)                         ║
╟──────────────────────────────────────────────────────────────────────────────╢
║  copyright            © 1999-2022 Alexey Parshin. All rights reserved.       ║
║  email                alexeyp@gmail.com                                      ║
╚══════════════════════════════════════════════════════════════════════════════╝
┌──────────────────────────────────────────────────────────────────────────────┐
│   This library is free software; you can redistribute it and/or modify it    │
│   under the terms of the GNU Library General Public License as published by  │
│   the Free Software Foundation; either version 2 of the License, or (at your │
│   option) any later version.                                                 │
│                                                                              │
│   This library 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 Library   │
│   General Public License for more details.                                   │
│                                                                              │
│   You should have received a copy of the GNU Library General Public License  │
│   along with this library; if not, write to the Free Software Foundation,    │
│   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.               │
│                                                                              │
│   Please report all bugs and problems to alexeyp@gmail.com.                  │
└──────────────────────────────────────────────────────────────────────────────┘
*/
 
#ifndef SPTK_ARCHIVEFILE_H
#define SPTK_ARCHIVEFILE_H
 
#include <sptk5/Buffer.h>
#include <sptk5/DateTime.h>
 
namespace sptk {
 
constexpr int TAR_BLOCK_SIZE = 512; 
 
#pragma pack(push, 1)
 
struct TarHeader {
    std::array<char, 100> filename;
    std::array<char, 8> mode;
    std::array<char, 8> uid;
    std::array<char, 8> gid;
    std::array<char, 12> size;
    std::array<char, 12> mtime;
    std::array<char, 8> chksum;
    char typeflag;
    std::array<char, 100> linkname;
    std::array<char, 6> magic;
    std::array<char, 2> version;
    std::array<char, 32> uname;
    std::array<char, 32> gname;
    std::array<char, 8> devmajor;
    std::array<char, 8> devminor;
    std::array<char, 155> prefix;
    std::array<char, 12> padding;
};
 
#pragma pack(pop)
 
class SP_EXPORT ArchiveFile
    : public Buffer
{
public:
    enum class Type : uint8_t
    {
        REGULAR_FILE = '0',   
        REGULAR_FILE2 = '\0', 
        HARD_LINK = '1',      
        SYM_LINK = '2',       
        CHARACTER = '3',      
        BLOCK = '4',          
        DIRECTORY = '5',      
        FIFO = '6',           
        CONTTYPE = '7'        
    };
 
    struct Ownership {
        int uid {0};
        int gid {0};
        String uname;
        String gname;
    };
 
    explicit ArchiveFile(const fs::path& fileName, const fs::path& baseDirectory);
 
    ArchiveFile(const fs::path& fileName, const Buffer& content, int mode, const DateTime& mtime,
                ArchiveFile::Type type, const Ownership& ownership, const fs::path& linkName);
 
    const char* header() const;
 
    String fileName() const
    {
        return m_fileName;
    }
 
    unsigned mode() const
    {
        return m_mode;
    }
 
    const Ownership& ownership() const
    {
        return m_ownership;
    }
 
    unsigned size() const
    {
        return m_size;
    }
 
    DateTime mtime() const
    {
        return m_mtime;
    }
 
    Type type() const
    {
        return m_type;
    }
 
    String linkname() const
    {
        return m_linkname;
    }
 
    static fs::path relativePath(const fs::path& fileName, const fs::path& baseDirectory);
 
private:
    String m_fileName;
    unsigned m_mode {777};
    Ownership m_ownership {};
    unsigned m_size {0};
    DateTime m_mtime;
    Type m_type {Type::REGULAR_FILE};
    String m_linkname;
 
    std::shared_ptr<TarHeader> m_header;
 
    void makeHeader();
};
 
using SArchiveFile = std::shared_ptr<ArchiveFile>;
 
} // namespace sptk
 
#endif