DumpBlock-forge-1.12.2.java

static Random r = new Random();
static int size = Block.REGISTRY.getKeys().size();

static boolean isValidBlock(Block block) {
    if (block.getCreativeTab() != CreativeTabs.BUILDING_BLOCKS)
        return false;
    if (block == Blocks.WATER)
        return false;
    if (block == Blocks.WATERLILY)
        return false;
    if (block == Blocks.ICE)
        return false;
    if (block == Blocks.FROSTED_ICE)
        return false;
    if (block == Blocks.PACKED_ICE)
        return false;
    if (block == Blocks.GRAVEL)
        return false;
    if (block == Blocks.SAND)
        return false;
    return true;
}

static IBlockState getBlockState() {
    Block block;
    do {
        block = Block.REGISTRY.getObjectById(r.nextInt(size));
    } while (!isValidBlock(block));
    ImmutableList<IBlockState> states = block.getBlockState().getValidStates();
    return states.get(r.nextInt(states.size()));
}

static int getIndex(int x, int y, int z) {
    return y << 8 | z << 4 | x;
}

// generate random block in chunk 0,0,0
static void generate(World world) {
    for (int x = 0; x < 16; x += 2) {
        for (int y = 0; y < 16; y += 2) {
            for (int z = 0; z < 16; z += 2) {
              IBlockState state = getBlockState();
              world.setBlockState(new BlockPos(x, y, z), state, 1);
            }
        }
    }
}

// dump chunk 0,0,0 blockstates
static void dump(World world) {
    List<String> lines = new ArrayList<>();
    Chunk chunk = world.getChunk(0, 0);
    net.minecraft.world.chunk.BlockStateContainer container = chunk.getBlockStorageArray()[0].getData();
    BitArray arr = null;

    Field f;
    try {
        f = container.getClass().getDeclaredField("storage");
        f.setAccessible(true);
        arr = (BitArray) f.get(container);
    } catch (Exception e1) {
        e1.printStackTrace();
    }

    lines.clear();

    for (int x = 0; x < 16; x += 2) {
        for (int y = 0; y < 16; y += 2) {
            for (int z = 0; z < 16; z += 2) {
                IBlockState state = container.get(x, y, z);
                int persistId = Block.BLOCK_STATE_IDS.get(state);
                lines.add(new StringBuilder().append(persistId).append(" ").append(x).append(" ").append(y).append(" ")
                        .append(z).append(" ").append(state).toString());
            }
        }
    }
    try {
        Files.write(Paths.get("mock.txt"), lines, Charset.defaultCharset());
    } catch (Exception e) {
    }
}