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NBTフォーマット

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NBTフォーマット(The Named Binary Tag format)はマインクラフトでデータをファイルに保存するのに使われる。このフォーマットをNotchが簡潔に説明しているspecification。このフォーマットは様々な"タグ"からなるツリー構造でデータを蓄えている。全てのタグはIDとnameを持っている。The original known version was 19132 as introduced in Minecraft Beta 1.3, and since then has been updated to 19133 with Anvil, with the addition of the Int Array tag.The NBT format dates all the way back to Minecraft Indev with tags 0 to 10 in use.

タグ定義[編集 | ソースを編集]

タグはデータツリーの一部分である。タグの最初のバイトはタグタイプIDである。続いて2バイトがnameの長さで、それからnameがUTF-8フォーマットで続いている(注意: TAG_Endに名前は無いので2バイトは必要ない、名前が空であると仮定されている)。タグnameにもしかしたらスペースがあるかもしれない、だがマインクラフト自身はけっしてnameにスペースを含めタグを保存することはない。最終的にタグのタイプによりタグのペイロードバイトが続く。このテーブルはNBTFormat19133バージョンにおける12のタグの説明である。

ID Icon Tag Type Payload Description Storage Capacity
0 TAG_End なし 終了するのに使用する。このタグに名前はない、だから1バイト(0)のみである。空のリストのタグになることもある。 N/A
1 Nbtsheet.png TAG_Byte 1 byte / 8 bits, signed 符号付整数型 しばしば真偽値を表すのにも使用される 範囲 -(27) to (27 - 1)
(-128 to 127)
2 Nbtsheet.png TAG_Short 2 bytes / 16 bits, signed, big endian 符号付整数型 範囲 -(215) to (215 - 1)
(-32,768 to 32,767)
3 Nbtsheet.png TAG_Int 4 bytes / 32 bits, signed, big endian 符号付整数型 範囲 -(231) to (231 - 1)
(-2,147,483,648 to 2,147,483,647)
4 Nbtsheet.png TAG_Long 8 bytes / 64 bits, signed, big endian 符号付整数型. 範囲 -(263) to (263 - 1)
(-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807)
5 Nbtsheet.png TAG_Float 4 bytes / 32 bits, signed, big endian, IEEE 754-2008, binary32 符号付浮動小数点数. Precision varies throughout number line;
See Single-precision floating-point format. 最大値 3.4*1038
6 Nbtsheet.png TAG_Double 8 bytes / 64 bits, signed, big endian, IEEE 754-2008, binary64 符号付浮動小数点数 Precision varies throughout number line;
See Double-precision floating-point format. 最大値 1.8*10308
7 Nbtsheet.png TAG_Byte_Array TAG_Intで要素数 それから要素数分のTAG_Byteのペイロード. バイト配列 最大要素数 (231 - 9) and (231 - 1) (2,147,483,639 and 2,147,483,647) JVMによる
8 Nbtsheet.png TAG_String TAG_Shortのペイロードでバイト数 それからUTF-8文字列のバイト. A UTF-8 string. It has a size, rather than being null terminated. 最大で32767バイト 詳しくはUTF-8フォーマットを参照
9 Nbtsheet.png TAG_List TAG_ByteのペイロードでTagタイプをキメる、続いてTAG_Intのペイロードで要素数を決める。それから指定したタグIDのペイロードが続く。. タグペイロードのリスト、なおTagIDは省略され名前も無い。 Due to JVM limitations and the implementation of ArrayList, the maximum number of list elements is (231 - 9), or 2,147,483,639. Also note that List and Compound tags may not be nested beyond a depth of 512.
10 Nbtsheet.png TAG_Compound フリーフォーマットである。終端にTAG_Endを指定する。 フリーフォーマット Unlike lists, there is no hard limit to the amount of tags within a Compound (of course, there is always the implicit limit of virtual memory). Note, however, that Compound and List tags may not be nested beyond a depth of 512.
11 Nbtsheet.png TAG_Int_Array TAG_Intのペイロードで要素数、それからTAG_Intのペイロードが要素数分続く。 4バイト整数配列 Maximum number of elements ranges between (231 - 9) and (231 - 1) (2,147,483,639 and 2,147,483,647), depending on the specific JVM.

The List and Compound tags can be and often are recursively nested. It should also be noted that, in a list of lists, each of the sub-lists can list a different kind of tag. 注意:要素数や文字数を示す型は符号付きである。

File Format[編集 | ソースを編集]

An NBT file is a GZip'd Compound tag, name and tag ID included. Some of the files utilized by Minecraft may be uncompressed, but in most cases the files follow Notch's original specification and are compressed with GZip. In the Xbox 360 Edition, chunks are compressed with XMemCompress, a variation of an LZX compression algorithm. There is no header to specify the version or any other information - only the level.dat file specifies the version.

As used in Minecraft[編集 | ソースを編集]

Minecraft's use of the NBT format is odd at times. In some instances, empty lists may be represented as a list of Byte tags rather than a list of the correct type, or as a list of End tags in newer versions of Minecraft, which can break some older NBT tools. Additionally, almost every root tag has an empty name string and encapsulates only one Compound tag with the actual data and a name. For instance:

  • Nbtsheet.png The root tag for most Minecraft NBT structures.
    • Nbtsheet.png SomeName: The only tag contained within the root tag - it has a name and contains all the actual data.

Another noticeable oddity is that, although the original specification by Notch allows for spaces in tag names, and even the example uses spaces in the tag names, Minecraft has no known files where any tags have spaces in their names. There is also inconsistent use of letter case, mostly either lowerCamelCase or UpperCamelCase, but sometimes even in all lowercase.

Uses[編集 | ソースを編集]

Software[編集 | ソースを編集]

Mojang has provided sample Java NBT classes for developers to use and reference as part of the source code for the McRegion -> Anvil converter. Other than this, the community has developed programs to view and modify compressed and uncompressed NBT files:

Name NBT Version Description Screenshot
MineBack Ultimate 19133 MineBack Ultimate provides a full NBT editor supporting all available types of NBT format file (Map, Level, World etc.). It comes with a modern GUI and many helper functions. MineBackNBTEditor.png
NBTEdit 19132 Allows for viewing and modifying NBT files via a Windows tree control. It is outdated not only from being an NBT version behind, but because it does not support multiple tags with the same name and it forces incorrect ranges on some types, and it lacks support for uncompressed NBT files. NBTEdit Level.Dat.png
NBTExplorer - Forum Post 19133 Inspired by and based on NBTEdit, this program allows viewing and editing of NBT files via a Windows tree control. It supports compressed and uncompressed NBT files, and allows for direct editing of the NBT structures in MCRegion and Anvil files, level.dat, etc. NBTExplorer.png
NBT grammar for Synalyze It! 19132 Using this grammar Synalyze It! displays a color-coded hex dump along with the parsed tag tree. Currently only uncompressed files are supported. Synalyze-It-NBT-decoded.png
NEINedit 19132 NBT editor for mac with a text-based tree structure. NEINedit.png
NBT2YAML 19133 nbt2yaml presents a command line interface for reading and editing Minecraft NBT files using a custom YAML format. It also includes a Python API for parsing and writing NBT files to/from a simple Python data structure.
webNBT 19133 webNBT is an NBT-editor that runs in modern browsers without requiring the user to download an application or use third-party browser plugins (like Flash or Java).