/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2017 OSSRS(winlin)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef SRS_KERNEL_FILE_HPP
#define SRS_KERNEL_FILE_HPP

#include <srs_core.hpp>

#include <srs_kernel_io.hpp>

#include <string>

// for srs-librtmp, @see https://github.com/ossrs/srs/issues/213
#ifndef _WIN32
#include <sys/uio.h>
#endif

/**
 * file writer, to write to file.
 */
class SrsFileWriter : public ISrsWriteSeeker
{
private:
    std::string path;
    int fd;
public:
    SrsFileWriter();
    virtual ~SrsFileWriter();
public:
    /**
     * open file writer, in truncate mode.
     * @param p a string indicates the path of file to open.
     */
    virtual int open(std::string p);
    /**
     * open file writer, in append mode.
     * @param p a string indicates the path of file to open.
     */
    virtual int open_append(std::string p);
    /**
     * close current writer.
     * @remark user can reopen again.
     */
    virtual void close();
public:
    virtual bool is_open();
    virtual void seek2(int64_t offset);
    virtual int64_t tellg();
// Interface ISrsWriteSeeker
public:
    virtual int write(void* buf, size_t count, ssize_t* pnwrite);
    virtual int writev(const iovec* iov, int iovcnt, ssize_t* pnwrite);
    virtual int lseek(off_t offset, int whence, off_t* seeked);
};

/**
 * file reader, to read from file.
 */
class SrsFileReader : public ISrsReadSeeker
{
private:
    std::string path;
    int fd;
public:
    SrsFileReader();
    virtual ~SrsFileReader();
public:
    /**
     * open file reader.
     * @param p a string indicates the path of file to open.
     */
    virtual int open(std::string p);
    /**
     * close current reader.
     * @remark user can reopen again.
     */
    virtual void close();
public:
    // TODO: FIXME: extract interface.
    virtual bool is_open();
    virtual int64_t tellg();
    virtual void skip(int64_t size);
    virtual int64_t seek2(int64_t offset);
    virtual int64_t filesize();
// Interface ISrsReadSeeker
public:
    virtual int read(void* buf, size_t count, ssize_t* pnread);
    virtual int lseek(off_t offset, int whence, off_t* seeked);
};

#endif