#include "kernel/filesystem/open_file_description.hpp"

#include "kernel/filesystem/file.hpp"

#include <kstd/memory>
#include <kstd/os/error.hpp>

#include <cstddef>

namespace filesystem
{
  open_file_description::open_file_description(kstd::shared_ptr<file> const & file)
      : m_file(file)
      , m_offset(0)
  {
    if (!file)
    {
      kstd::os::panic("[FILESYSTEM] open_file_description constructed with null file.");
    }
  }

  auto open_file_description::read(void * buffer, size_t size) -> size_t
  {
    auto read_bytes = m_file->read(buffer, m_offset, size);
    m_offset += read_bytes;
    return read_bytes;
  }

  auto open_file_description::write(void const * buffer, size_t size) -> size_t
  {
    auto written_bytes = m_file->write(buffer, m_offset, size);
    m_offset += written_bytes;
    return written_bytes;
  }
}  // namespace filesystem