Function LoadData

PanzerChasm/save_load.cpp:90–153

Returns true, if all ok

// Returns true, if all ok
bool LoadData(
	const char* file_name,
	SaveLoadBuffer& out_data )
{
	FILE* const f= std::fopen( file_name, "rb" );
	if( f == nullptr )
	{
		Log::Warning( "Can not read save \"", file_name, "\"." );
		return false;
	}

	std::fseek( f, 0, SEEK_END );
	const unsigned int file_size= std::ftell( f );
	std::fseek( f, 0, SEEK_SET );

	if( file_size < sizeof(SaveHeader) + sizeof(SaveComment) )
	{
		Log::Warning( "Save file is broken - it is too small." );
		std::fclose(f);
		return false;
	}

	SaveHeader header;
	FileRead( f, &header, sizeof(SaveHeader) );

	if( std::memcmp( header.id, header.c_expected_id, sizeof(header.id) ) != 0 )
	{
		Log::Warning( "Save file is not a PanzerChasm save." );
		std::fclose(f);
		return false;
	}
	if( header.version != SaveHeader::c_expected_version )
	{
		Log::Warning( "Save file has different version." );
		std::fclose(f);
		return false;
	}

	const unsigned int content_size= file_size - ( sizeof(SaveHeader) + sizeof(SaveComment) );
	if( header.content_size != content_size )
	{
		Log::Warning( "Save file has content size, different from actual file size." );
		std::fclose(f);
		return false;
	}

	SaveComment save_comment;
	FileRead( f, save_comment.data(), sizeof(SaveComment) );

	out_data.resize( content_size );
	FileRead( f, out_data.data(), out_data.size() );

	if( header.content_hash != SaveHeader::CalculateHash( out_data.data(), out_data.size() ) )
	{
		out_data.clear();

		Log::Warning( "Save file is broken - saved content hash is different from actual content hash." );
		std::fclose(f);