Streams.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2019 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * Part of this file comes from SFML, with the same license:
 * Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
 */
#ifndef GF_STREAMS_H
#define GF_STREAMS_H

#include <cstddef>
#include <cstdio>

#include <zlib.h>

#include "Stream.h"
#include "Path.h"
#include "Portability.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class GF_API FileInputStream : public InputStream {
  public:
    explicit FileInputStream(const Path& path);

    ~FileInputStream();

    std::size_t read(BufferRef<uint8_t> buffer) override;
    void seek(std::ptrdiff_t position) override;
    void skip(std::ptrdiff_t position) override;
    bool isFinished() override;

  private:
    std::FILE *m_file;
  };


  class GF_API MemoryInputStream : public InputStream {
  public:
    explicit MemoryInputStream(ArrayRef<uint8_t> memory);

    std::size_t read(BufferRef<uint8_t> buffer) override;
    void seek(std::ptrdiff_t position) override;
    void skip(std::ptrdiff_t position) override;
    bool isFinished() override;

  private:
    ArrayRef<uint8_t> m_memory;
    std::size_t m_offset;
  };


  class GF_API CompressedInputStream : public InputStream {
  public:
    explicit CompressedInputStream(InputStream& compressed);

    virtual ~CompressedInputStream();

    std::size_t read(BufferRef<uint8_t> buffer) override;
    void seek(std::ptrdiff_t position) override;
    void skip(std::ptrdiff_t position) override;
    bool isFinished() override;

  private:
    static constexpr uInt BufferSize = 256;

    InputStream *m_compressed;
    z_stream m_stream;
    uInt m_start;
    uInt m_stop;
    bool m_eof;
    Bytef m_buffer[BufferSize];
  };


  class GF_API BufferInputStream : public InputStream {
  public:
    BufferInputStream(std::vector<uint8_t> *bytes);

    std::vector<uint8_t> *getBytes() {
      return m_bytes;
    }

    virtual std::size_t read(BufferRef<uint8_t> buffer) override;
    virtual void seek(std::ptrdiff_t position) override;
    virtual void skip(std::ptrdiff_t position) override;
    virtual bool isFinished() override;
  private:
    std::vector<uint8_t> *m_bytes;
    std::size_t m_offset;
  };


  class GF_API FileOutputStream : public OutputStream {
  public:
    enum class Mode {
      Write,  
      Append, 
    };

    FileOutputStream(const Path& path, Mode mode = Mode::Write);

    ~FileOutputStream();

    std::size_t write(ArrayRef<uint8_t> buffer) override;

    std::size_t getWrittenBytesCount() const override;

  private:
    std::FILE *m_file;
    std::size_t m_written;
  };

  class GF_API MemoryOutputStream : public OutputStream {
  public:
    explicit MemoryOutputStream(BufferRef<uint8_t> memory);

    std::size_t write(ArrayRef<uint8_t> buffer) override;

    std::size_t getWrittenBytesCount() const override;
  private:
    BufferRef<uint8_t> m_memory;
    std::size_t m_offset;
  };


  class GF_API CompressedOutputStream : public OutputStream {
  public:
    explicit CompressedOutputStream(OutputStream& compressed);

    ~CompressedOutputStream();

    std::size_t write(ArrayRef<uint8_t> buffer) override;

    std::size_t getWrittenBytesCount() const override;
  private:
    static constexpr uInt BufferSize = 256;

    OutputStream *m_compressed;
    z_stream m_stream;
    Bytef m_buffer[BufferSize];
  };


  class GF_API BufferOutputStream : public OutputStream {
  public:
    BufferOutputStream(std::vector<uint8_t> *bytes);

    std::vector<uint8_t> *getBytes() {
      return m_bytes;
    }

    virtual std::size_t write(ArrayRef<uint8_t> buffer) override;
    virtual std::size_t getWrittenBytesCount() const override;

  private:
    std::vector<uint8_t> *m_bytes;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_STREAMS_H