Function SlLoadChunk

src/saveload/saveload.cpp:2148–2194

* Load a chunk of data (eg vehicles, stations, etc.) * @param ch The chunkhandler that will be used for the operation */

 * @param ch The chunkhandler that will be used for the operation
 */
static void SlLoadChunk(const ChunkHandler &ch)
{
	uint8_t m = SlReadByte();

	_sl.block_mode = m & CH_TYPE_MASK;
	_sl.obj_len = 0;
	_sl.expect_table_header = (_sl.block_mode == CH_TABLE || _sl.block_mode == CH_SPARSE_TABLE);

	/* The header should always be at the start. Read the length; the
	 * Load() should as first action process the header. */
	if (_sl.expect_table_header) {
		if (SlIterateArray() != INT32_MAX) SlErrorCorrupt("Table chunk without header");
	}

	switch (_sl.block_mode) {
		case CH_TABLE:
		case CH_ARRAY:
			_sl.array_index = 0;
			ch.Load();
			if (_next_offs != 0) SlErrorCorrupt("Invalid array length");
			break;
		case CH_SPARSE_TABLE:
		case CH_SPARSE_ARRAY:
			ch.Load();
			if (_next_offs != 0) SlErrorCorrupt("Invalid array length");
			break;
		case CH_RIFF: {
			/* Read length */
			size_t len = (SlReadByte() << 16) | ((m >> 4) << 24);
			len += SlReadUint16();
			_sl.obj_len = len;
			size_t start_pos = _sl.reader->GetSize();
			size_t endoffs = start_pos + len;
			ch.Load();

			if (_sl.reader->GetSize() != endoffs) {
				SlErrorCorruptFmt("Invalid chunk size in RIFF in {} - expected {}, got {}", ch.GetName(), len, _sl.reader->GetSize() - start_pos);
			}
			break;
		}
		default:
			SlErrorCorrupt("Invalid chunk type");
			break;
	}

	if (_sl.expect_table_header) SlErrorCorrupt("Table chunk without header");
}

/**
 * Load a chunk of data for checking savegames.