2016-12-28 19:45:01 +01:00
|
|
|
#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
|
|
|
|
/*****************************************************************************
|
|
|
|
* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
|
|
|
|
*
|
|
|
|
* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
|
|
|
|
* For more information, visit https://github.com/OpenRCT2/OpenRCT2
|
|
|
|
*
|
|
|
|
* OpenRCT2 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, either version 3 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* A full copy of the GNU General Public License can be found in licence.txt
|
|
|
|
*****************************************************************************/
|
|
|
|
#pragma endregion
|
|
|
|
|
|
|
|
#include "core/FileStream.hpp"
|
|
|
|
#include "FileClassifier.h"
|
2017-02-05 13:18:07 +01:00
|
|
|
#include "rct12/SawyerChunkReader.h"
|
2016-12-28 19:45:01 +01:00
|
|
|
|
|
|
|
extern "C"
|
|
|
|
{
|
|
|
|
#include "scenario/scenario.h"
|
|
|
|
#include "util/sawyercoding.h"
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool TryClassifyAsS6(IStream * stream, ClassifiedFile * result);
|
|
|
|
static bool TryClassifyAsS4(IStream * stream, ClassifiedFile * result);
|
|
|
|
static bool TryClassifyAsTD4_TD6(IStream * stream, ClassifiedFile * result);
|
|
|
|
|
|
|
|
bool TryClassifyFile(const std::string &path, ClassifiedFile * result)
|
|
|
|
{
|
|
|
|
try
|
|
|
|
{
|
|
|
|
auto fs = FileStream(path, FILE_MODE_OPEN);
|
|
|
|
return TryClassifyFile(&fs, result);
|
|
|
|
}
|
|
|
|
catch (Exception)
|
|
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
bool TryClassifyFile(IStream * stream, ClassifiedFile * result)
|
|
|
|
{
|
|
|
|
// TODO Currently track designs get classified as SC4s because they use the
|
|
|
|
// same checksum algorithm. The only way after to tell the difference
|
|
|
|
// between them is to decode it. Decoding however is currently not protected
|
|
|
|
// against invalid compression data for that decoding algorithm and will crash.
|
|
|
|
|
|
|
|
// S6 detection
|
|
|
|
if (TryClassifyAsS6(stream, result))
|
|
|
|
{
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
// S4 detection
|
|
|
|
if (TryClassifyAsS4(stream, result))
|
|
|
|
{
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
// TD6 detection
|
|
|
|
if (TryClassifyAsTD4_TD6(stream, result))
|
|
|
|
{
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool TryClassifyAsS6(IStream * stream, ClassifiedFile * result)
|
|
|
|
{
|
2017-02-05 13:18:07 +01:00
|
|
|
try
|
2016-12-28 19:45:01 +01:00
|
|
|
{
|
2017-02-05 13:18:07 +01:00
|
|
|
auto chunkReader = SawyerChunkReader(stream);
|
|
|
|
auto s6Header = chunkReader.ReadChunkAs<rct_s6_header>();
|
2016-12-28 19:45:01 +01:00
|
|
|
if (s6Header.type == S6_TYPE_SAVEDGAME)
|
|
|
|
{
|
|
|
|
result->Type = FILE_TYPE::SAVED_GAME;
|
|
|
|
}
|
|
|
|
else if (s6Header.type == S6_TYPE_SCENARIO)
|
|
|
|
{
|
|
|
|
result->Type = FILE_TYPE::SCENARIO;
|
|
|
|
}
|
|
|
|
result->Version = s6Header.version;
|
|
|
|
return true;
|
|
|
|
}
|
2017-02-05 13:18:07 +01:00
|
|
|
catch (Exception)
|
|
|
|
{
|
|
|
|
}
|
2016-12-28 19:45:01 +01:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool TryClassifyAsS4(IStream * stream, ClassifiedFile * result)
|
|
|
|
{
|
|
|
|
uint64 originalPosition = stream->GetPosition();
|
|
|
|
size_t dataLength = (size_t)stream->GetLength();
|
|
|
|
uint8 * data = stream->ReadArray<uint8>(dataLength);
|
|
|
|
stream->SetPosition(originalPosition);
|
2017-01-04 22:17:08 +01:00
|
|
|
sint32 fileTypeVersion = sawyercoding_detect_file_type(data, dataLength);
|
2016-12-28 19:45:01 +01:00
|
|
|
Memory::Free(data);
|
|
|
|
|
2017-01-04 22:17:08 +01:00
|
|
|
sint32 type = fileTypeVersion & FILE_TYPE_MASK;
|
|
|
|
sint32 version = fileTypeVersion & FILE_VERSION_MASK;
|
2016-12-28 19:45:01 +01:00
|
|
|
|
|
|
|
if (type == FILE_TYPE_SV4)
|
|
|
|
{
|
|
|
|
result->Type = FILE_TYPE::SAVED_GAME;
|
|
|
|
result->Version = version;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
else if (type == FILE_TYPE_SC4)
|
|
|
|
{
|
|
|
|
result->Type = FILE_TYPE::SCENARIO;
|
|
|
|
result->Version = version;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool TryClassifyAsTD4_TD6(IStream * stream, ClassifiedFile * result)
|
|
|
|
{
|
|
|
|
bool success = false;
|
|
|
|
uint64 originalPosition = stream->GetPosition();
|
|
|
|
size_t dataLength = (size_t)stream->GetLength();
|
|
|
|
uint8 * data = stream->ReadArray<uint8>(dataLength);
|
|
|
|
stream->SetPosition(originalPosition);
|
|
|
|
|
|
|
|
if (sawyercoding_validate_track_checksum(data, dataLength))
|
|
|
|
{
|
|
|
|
uint8 * td6data = Memory::Allocate<uint8>(0x10000);
|
|
|
|
size_t td6len = sawyercoding_decode_td6(data, td6data, dataLength);
|
|
|
|
if (td6data != nullptr && td6len >= 8)
|
|
|
|
{
|
|
|
|
uint8 version = (td6data[7] >> 2) & 3;
|
|
|
|
if (version <= 2)
|
|
|
|
{
|
|
|
|
result->Type = FILE_TYPE::TRACK_DESIGN;
|
|
|
|
result->Version = version;
|
|
|
|
success = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
Memory::Free(td6data);
|
|
|
|
}
|
|
|
|
Memory::Free(data);
|
|
|
|
|
|
|
|
return success;
|
|
|
|
}
|