NBT-Cpp

The NBT::Tag class is a class to load, create, modify, save, and print NBT files.

From Notch's original 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.

Features

• read raw filestream
• read gzip filestream
• read byte array
• get tag name
• get tag type
• get tag value
• get compound subtag
• get list item
• get tag content as string
• print tag tree as json
• read region chunk

To do list

• read region timestamps
• write raw filestream
• write gzip filestream
• write region chunk

Included programs

####worldmap.cpp

Takes a minecraft world path and renders the map into worldmap.png. Rendered are width by height blocks around the center, each block zoom by zoom pixels large. Optionally prints center x, center z, width, and height of the map. The current color data is from the default texture pack, slightly adjusted by me. The renderer even calculates block transparency and does a bit of height mapping.

Arguments:

<worldpath> [center x=0] [center z=0] [width=256] [height=256] [zoom=1] [info text size=10]

• worldpath: The path to the Minecraft world.
  • Example: saves/Legio-Umbra/
• center x: The x coordinate of the block at the center of the image.
  • Example: 500
• center z: The z coordinate of the block at the center of the image.
  • Example: -432
• width: The x range of the blocks in the image.
  • Example: 600
• height: The z range of the blocks in the image.
  • Example: 400
• zoom: The size of each map pixel.
  • Example: 5
• info text size: The font size to use for the info text. 0 for no text.
  • Example: 12

Example:

worldmap saves/Legio-Umbra/ 500 -432 600 400 5 12

Renders saves/Legio-Umbra/ with 5x5 block size and prints various data in font size 12. The image contains all blocks from 200,-632 to 799,-231.

####main.cpp

Prints a json-like tree of the provided file. Supports uncompressed and gzip compressed files.

Arguments:

<path/to/file> [tag path=""]

• path/to/file: The file to load the tag from.
  • Example: testdata/bigtest.nbt
• tag path: The path to the tag that will be printed.
  • Example: nested compound test.ham.name

Example:

main bigtest.nbt

Prints the content of bigtest.nbt, which is too long and can be found here: http://wiki.vg/NBT#bigtest.nbt

####map.cpp

Takes a minecraft world path and map id and renders the map item into map_#.png. Optionally prints scale, dimension, xCenter and zCenter of the map.

Arguments:

<worldpath> <mapnr> [zoom=5] [info text size=0]

• worldpath: The path to the Minecraft world.
  • Example: saves/Legio-Umbra/
• mapnr: The id of the map item.
  • Example: 4
• zoom: The size of each map pixel.
  • Example: 5
• info text size: The font size to use for the info text. 0 for no text.
  • Example: 12

Example:

map saves/Legio-Umbra/ 4 5 12

Renders saves/Legio-Umbra/data/map_4.dat with 5x5 pixel size and prints various map data in font size 12.

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