NBT 1.3

Named Binary Tag Reader/Writer

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Other/Proprietary License
Thomas Woolford
ROOT \ Utilities
NBT is a Named Binary Tag parser based upon the specification by Markus Persson.

From The spec:

 "NBT (Named Binary Tag) is a tag based binary format designed to carry large
 amounts of binary data with smaller amounts of additional data. An NBT file consists of a single GZIPped Named Tag of type TAG_Compound."

read the full spec at http://www.minecraft.net/docs/NBT.txt


 1. Reading files.

 the easiest way to read an nbt file is to instantiate an NBTFile object e.g.

 >>> import nbt
 >>> nbtfile = nbt.NBTFile("bigtest.nbt",'rb')
 >>> nbtfile.name.value
 >>> nbtfile["nested compound test"].tag_info()
 TAG_Compound("nested compound test"): 2 Entries
 >>> for tag in nbtfile["nested compound test"]["ham"].tags:
 ... print tag.tag_info()
 TAG_String("name"): Hampus
 TAG_Float("value"): 0.75
 >>> [tag.value for tag in nbtfile["listTest (long)"].tags]
 [11, 12, 13, 14, 15]

 2. Writing files.

 Writing files is easy too! if you have a NBTFile object, simply call it's write_file() method. If the NBTFile was instantiated with a filename, then write_file needs no extra arguments. It just works. If however you created a new file object from scratch (or even if you just want to save it somewhere else) call write_file('pathtonewfile.nbt')

 >>> import nbt
 >>> nbtfile = nbt.NBTFile("bigtest.nbt",'rb')
 >>> nbtfile["listTest (compound)"][0].value = u'Hello World!'
 >>> nbtfile.write_file("newnbtfile.nbt")

 3. Creating files

 Creating files is trickier but ultimately should give you no issue, as long as you have read the NBT spec (hint.. it's very short). Also be sure to note that the NBTFile object is actually a TAG_Compound with some wrapper features, so you can use all the standard tag features

 >>> from nbt import *
 >>> nbtfile = NBTFile()

 first, don't forget to name the top level tag

 >>> nbtfile.name = TAG_String("My Top Level Tag")
 >>> nbtfile.tags.append(TAG_Float(name="My Float Name", value=3.152987593947))
 >>> mylist = TAG_List(name="TestList", type=TAG_Long) #type needs to be pre-declared!
 >>> mylist.tags.append(TAG_Long(100))
 >>> mylist.tags.extend([TAG_Long(120),TAG_Long(320),TAG_Long(19)])
 >>> nbtfile.tags.append(mylist)
 >>> print nbtfile.pretty_tree()
 TAG_Compound("My Top Level Tag"): 2 Entries
 TAG_Float("My Float Name"): 3.15298759395
 TAG_List("TestList"): 4 entries of type TAG_Long
 TAG_Long: 100
 TAG_Long: 120
 TAG_Long: 320
 TAG_Long: 19
 >>> nbtfile["TestList"].tags.sort(key = lambda tag: tag.value)
 >>> print nbtfile.pretty_tree()
 TAG_Compound("My Top Level Tag"): 2 Entries
 TAG_Float("My FloatName"): 3.15298759395
 TAG_List("TestList"): 4 entries of type TAG_Long
 TAG_Long: 19
 TAG_Long: 100
 TAG_Long: 120
 TAG_Long: 320
 >>> nbtfile.write_file("mynbt.dat")

Last updated on May 22nd, 2012


#tag parser #named binary #named #binary #tag #parser

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