newgrf_bytereader.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
#include "../core/backup_type.hpp"
#include "../string_func.h"
#include "newgrf_bytereader.h"
 
#include "../safeguards.h"
 
uint32_t ByteReader::PeekDWord()
{
  AutoRestoreBackup backup(this->data, this->data);
  return this->ReadDWord();
}
 
uint32_t ByteReader::ReadVarSize(uint8_t size)
{
  switch (size) {
    case 1: return this->ReadByte();
    case 2: return this->ReadWord();
    case 4: return this->ReadDWord();
    default:
      NOT_REACHED();
      return 0;
  }
}
 
std::string_view ByteReader::ReadString()
{
  const char *string = reinterpret_cast<const char *>(this->data);
  size_t string_length = ttd_strnlen(string, this->Remaining());
 
  /* Skip past the terminating NUL byte if it is present, but not more than remaining. */
  this->Skip(std::min(string_length + 1, this->Remaining()));
 
  return std::string_view(string, string_length);
}