sys_file.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef M4_FILEIO_SYS_FILE_H
#define M4_FILEIO_SYS_FILE_H

#include "common/file.h"
#include "m4/fileio/fileio.h"
#include "m4/mem/reloc.h"

namespace M4 {

struct Hash_Record {
    Common::String filename;
    byte hagfile;
    byte disks;
    uint32 offset;
    uint32 size;
};

struct Hag_Statics {
    bool hag_flag = false;
    bool first_read_flag = false;
    Common::Path hash_file;
    Hag_Name_Record *hag_name_list = nullptr;
    Hag_Record *hag_file_list = nullptr;
};

class SysFile {
private:
    Common::Stream *_fp = nullptr;
    FileMode fmode;
    AccessMode mode = UNOPENED;
    int hag_success = 0;
    bool show_error_flag = true;
    Hag_Record *curr_hag_record = nullptr;
    Hash_Record curr_hash_record;
    uint32 last_head_pos = 0;

private:
    void open_read();
    void open_write();
    void open_read_low_level();
    bool open_hash_file();
    Common::String get_last_string(const Common::String &src);

    uint32 key_to_hash_address(const Common::String &src, uint32 hash_table_size);

    int hash_search(const Common::String &fname, Hash_Record *current_hash_record_ptr, Hag_Record *curr_hag_record, uint32 hash_address,
        Common::SeekableReadStream *hashfp, uint32 hash_table_size, bool show_error_flag);

    Common::Stream *open_by_first_char();

    bool get_local_name_from_hagfile(Common::String &local_name, byte hagfile);

    Common::SeekableReadStream *rs() const;

public:
    Common::String filename;

public:
    SysFile(const Common::String &fname, FileMode myfmode = BINARY);

    bool exists();

    uint32 size();

    uint32 get_pos();

    bool seek(uint32 pos);

    bool seek_ahead(int32 amount);

    uint32 read(MemHandle bufferHandle);
    int32 read(MemHandle bufferHandle, int32 n);

    uint32 readUint32LE();
    int32 readSint32LE() {
        return (int32)readUint32LE();
    }

    void close();
};

void sysfile_init(bool in_hag_mode);
void sysfile_shutdown();

} // namespace M4

#endif