// Aseprite TGA Library
// Copyright (C) 2020-2021  Igara Studio S.A.
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#include "tga.h"

#include <cassert>
#include <limits>

namespace tga {

StdioFileInterface::StdioFileInterface(FILE* file)
  : m_file(file)
  , m_ok(true)
{
}

bool StdioFileInterface::ok() const
{
  return m_ok;
}

size_t StdioFileInterface::tell()
{
  return ftell(m_file);
}

void StdioFileInterface::seek(size_t absPos)
{
  // To detect surprises with the size_t -> long cast.
  assert(absPos <= std::numeric_limits<long>::max());

  fseek(m_file, (long)absPos, SEEK_SET);
}

uint8_t StdioFileInterface::read8()
{
  int value = fgetc(m_file);
  if (value != EOF) {
    // We can safely cast to uint8_t as EOF is the only special
    // non-uint8 value than fgetc() should return.
    return (uint8_t)value;
  }

  m_ok = false;
  return 0;
}

void StdioFileInterface::write8(uint8_t value)
{
  fputc(value, m_file);
}

} // namespace tga