stdiostream.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 BACKENDS_FS_STDIOSTREAM_H
#define BACKENDS_FS_STDIOSTREAM_H

#include "common/scummsys.h"
#include "common/noncopyable.h"
#include "common/stream.h"
#include "common/str.h"

class StdioStream : public Common::SeekableReadStream, public Common::SeekableWriteStream, public Common::NonCopyable {
public:
    enum WriteMode {
        WriteMode_Read = 0,
        WriteMode_Write = 1,
        WriteMode_WriteAtomic = 2,
    };

protected:
    void *_handle;
    Common::String *_path;

    static StdioStream *makeFromPathHelper(const Common::String &path, WriteMode writeMode,
            StdioStream *(*factory)(void *handle));

public:
    static StdioStream *makeFromPath(const Common::String &path, WriteMode writeMode) {
        return makeFromPathHelper(path, writeMode, [](void *handle) {
            return new StdioStream(handle);
        });
    }

    StdioStream(void *handle);
    ~StdioStream() override;

    bool err() const override;
    void clearErr() override;
    bool eos() const override;

    uint32 write(const void *dataPtr, uint32 dataSize) override;
    bool flush() override;

    int64 pos() const override;
    int64 size() const override;
    bool seek(int64 offs, int whence = SEEK_SET) override;
    uint32 read(void *dataPtr, uint32 dataSize) override;

    bool setBufferSize(uint32 bufferSize);

private:
    bool moveFile(const Common::String &src, const Common::String &dst);
};

#endif