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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/EnumBits.h>
#include <AK/Forward.h>
#include <AK/Stream.h>
#include <LibCore/Object.h>
namespace Core {
enum class OpenMode : unsigned {
NotOpen = 0,
ReadOnly = 1,
WriteOnly = 2,
ReadWrite = 3,
Append = 4,
Truncate = 8,
MustBeNew = 16,
KeepOnExec = 32,
};
AK_ENUM_BITWISE_OPERATORS(OpenMode)
class IODevice : public Object {
C_OBJECT_ABSTRACT(IODevice)
public:
virtual ~IODevice() override = default;
int fd() const { return m_fd; }
OpenMode mode() const { return m_mode; }
bool eof() const { return m_eof; }
int error() const { return m_error; }
char const* error_string() const;
int read(u8* buffer, int length);
ByteBuffer read(size_t max_size);
ByteBuffer read_all();
DeprecatedString read_line(size_t max_size = 16384);
bool write(u8 const*, int size);
bool can_read_line() const;
bool seek(i64, SeekMode = SeekMode::SetPosition, off_t* = nullptr);
virtual bool open(OpenMode) = 0;
virtual bool close();
protected:
explicit IODevice(Object* parent = nullptr);
void set_fd(int);
void set_mode(OpenMode mode) { m_mode = mode; }
void set_error(int error) const { m_error = error; }
void set_eof(bool eof) const { m_eof = eof; }
private:
bool populate_read_buffer(size_t size = 1024) const;
bool can_read_from_fd() const;
int m_fd { -1 };
OpenMode m_mode { OpenMode::NotOpen };
mutable int m_error { 0 };
mutable bool m_eof { false };
mutable Vector<u8> m_buffered_data;
};
}
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