/**
 * Load a voxel stack from the save game file.
 * @param ldr Input stream to read.
 */
void VoxelStack::Load(Loader &ldr)
{
	this->Clear();
	uint32 version = ldr.OpenBlock("VSTK");
	if (version == 1) {
		int16 base = ldr.GetWord();
		uint16 height = ldr.GetWord();
		uint8 owner = ldr.GetByte();
		if (base < 0 || base + height > WORLD_Z_SIZE || owner >= OWN_COUNT) {
			ldr.SetFailMessage("Incorrect voxel stack size");
		} else {
			this->base = base;
			this->height = height;
			this->owner = (TileOwner)owner;
			delete[] this->voxels;
			this->voxels = (height > 0) ? MakeNewVoxels(height) : nullptr;
			for (uint i = 0; i < height; i++) this->voxels[i].Load(ldr, version);
		}
	}
	ldr.CloseBlock();
}

/**
 * Save a voxel stack to the save game file.
 * @param svr Output stream to write.
 */
void VoxelStack::Save(Saver &svr) const
{
	svr.StartBlock("VSTK", 1);
	svr.PutWord(this->base);
	svr.PutWord(this->height);
	svr.PutByte(this->owner);
	for (uint i = 0; i < this->height; i++) this->voxels[i].Save(svr);
	svr.EndBlock();
}