Talk:Anvil file format

ok, i updated my server to 1.2.3, and i want to revert to 1.1, becouse all the plugins are not working. (mostly /zmod) i need to convert it from anvill back to what ever it was befor. and the instruscions are not very clear on the page. can someone help me out? like a dumb i forgot to back it up. thank you in advance. my name is masterman467 im just to lazy to log in.

Example Chunk
Below is an Example of an Anvil chunk. May be useful to others.

TAG_Compound(""): 1 entries { TAG_Compound("Level"): 9 entries {   TAG_List("Entities"): 0 entries {   }    TAG_ByteArray("Biomes"):      [256 values] TAG_Int64("LastUpdate"): 215588 TAG_Int32("xPos"): -5 TAG_Int32("zPos"): -112 TAG_List("TileEntities"): 0 entries {   }    TAG_Int8("TerrainPopulated"): 1 TAG_Int32Array("HeightMap"):     [256 values] TAG_List("Sections"): 5 entries {     TAG_Compound("0"): 5 entries {       TAG_ByteArray("Data"):          [2048 values] TAG_ByteArray("SkyLight"):         [2048 values] TAG_ByteArray("BlockLight"):         [2048 values] TAG_Int8("Y"): 0 TAG_ByteArray("Blocks"):         [4096 values] }     TAG_Compound("1"): 5 entries {       TAG_ByteArray("Data"):          [2048 values] TAG_ByteArray("SkyLight"):         [2048 values] TAG_ByteArray("BlockLight"):         [2048 values] TAG_Int8("Y"): 1 TAG_ByteArray("Blocks"):         [4096 values] }     TAG_Compound("2"): 5 entries {       TAG_ByteArray("Data"):          [2048 values] TAG_ByteArray("SkyLight"):         [2048 values] TAG_ByteArray("BlockLight"):         [2048 values] TAG_Int8("Y"): 2 TAG_ByteArray("Blocks"):         [4096 values] }     TAG_Compound("3"): 5 entries {       TAG_ByteArray("Data"):          [2048 values] TAG_ByteArray("SkyLight"):         [2048 values] TAG_ByteArray("BlockLight"):         [2048 values] TAG_Int8("Y"): 3 TAG_ByteArray("Blocks"):         [4096 values] }     TAG_Compound("4"): 5 entries {       TAG_ByteArray("Data"):          [2048 values] TAG_ByteArray("SkyLight"):         [2048 values] TAG_ByteArray("BlockLight"):         [2048 values] TAG_Int8("Y"): 4 TAG_ByteArray("Blocks"):         [4096 values] }   }  } }

--Stucuk 18:00, 11 March 2012 (UTC)


 * Thanks! Having an actual example is much more helpful than just the description. Posted right when I needed it, too. -- Orthotope 00:14, 12 March 2012 (UTC)

This seems relevant: Rumsey figured out what the biome ids actually correspond to: http://www.minecraftforum.net/topic/1034766-list-of-biome-ids/page__p__12881601#entry12881601 Orangy Tang 18:10, 21 March 2012 (UTC)

How many chunks are in a anvil mca file? The page for region mcr files mentioned this as being 16x16 for mcr regions.