Package net.minecraft.nbt

Class NbtIo

java.lang.Object

net.minecraft.nbt.NbtIo

public class NbtIo
extends Object

A set of utility functions for reading, writing, and scanning NBT files. Methods that do not require NbtTagSizeTracker accept any bytes of data, provided that its depth does not exceed 512.

When writing an invalid string, methods in this class will write an empty string instead of crashing, with the exception of writeUnsafe(net.minecraft.nbt.NbtElement, java.io.DataOutput) which throws instead.

Mappings:

Namespace	Name
official	ta
intermediary	net/minecraft/class_2507
named	net/minecraft/nbt/NbtIo

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NbtIo.InvalidUtfSkippingDataOutput

Field Summary

Fields

Modifier and Type	Field	Description
private static final OpenOption[]	OPEN_OPTIONS

Constructor Summary

Constructors

Constructor	Description
NbtIo()

Method Summary

Modifier and Type	Method	Description
private static DataOutputStream	compress(OutputStream stream)	Returns a new output stream that compresses the input stream.
private static DataInputStream	decompress(InputStream stream)	Returns a new input stream that decompresses the input stream.
static NbtElement	read(DataInput input, NbtTagSizeTracker tracker)	Reads an NBT element from input.
static @Nullable NbtCompound	read(Path path)	Reads an NBT compound from the file atpath.
static NbtCompound	readCompound(DataInput input)	Reads an NBT compound from input.
static NbtCompound	readCompound(DataInput input, NbtTagSizeTracker tracker)	Reads an NBT compound from input.
static NbtCompound	readCompressed(InputStream stream, NbtTagSizeTracker tagSizeTracker)	Reads an NBT compound from Gzip-compressed stream.
static NbtCompound	readCompressed(Path path, NbtTagSizeTracker tagSizeTracker)	Reads an NBT compound from Gzip-compressed file at path.
private static NbtElement	readElement(DataInput input, NbtTagSizeTracker tracker)
private static NbtElement	readElement(DataInput input, NbtTagSizeTracker tracker, byte typeId)
static void	scan(DataInput input, NbtScanner scanner, NbtTagSizeTracker tracker)	Scans the NBT input using scanner.
static void	scanCompressed(InputStream stream, NbtScanner scanner, NbtTagSizeTracker tracker)	Scans the compressed NBT stream using scanner.
static void	scanCompressed(Path path, NbtScanner scanner, NbtTagSizeTracker tracker)	Scans the compressed NBT file using scanner.
static void	write(NbtCompound nbt, Path path)	Writes the nbt to the file at path.
static void	write(NbtElement nbt, DataOutput output)	Writes the nbt to output.
static void	writeCompound(NbtCompound nbt, DataOutput output)	Writes the nbt to output.
static void	writeCompressed(NbtCompound nbt, OutputStream stream)	Writes the Gzip-compressed nbt to stream.
static void	writeCompressed(NbtCompound nbt, Path path)	Writes the Gzip-compressed nbt to the file at path.
static void	writeForPacket(NbtElement nbt, DataOutput output)	Writes the nbt to output.
static void	writeUnsafe(NbtElement nbt, DataOutput output)	Writes the nbt to output.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

OPEN_OPTIONS

private static final OpenOption[] OPEN_OPTIONS

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a:[Ljava/nio/file/OpenOption;
intermediary	field_47513	Lnet/minecraft/class_2507;field_47513:[Ljava/nio/file/OpenOption;
named	OPEN_OPTIONS	Lnet/minecraft/nbt/NbtIo;OPEN_OPTIONS:[Ljava/nio/file/OpenOption;

Constructor Details

NbtIo

public NbtIo()

Method Details

readCompressed

public static NbtCompound readCompressed(Path path,
 NbtTagSizeTracker tagSizeTracker)
                                  throws IOException

Reads an NBT compound from Gzip-compressed file at path.

Returns:

the NBT compound from the file

Throws:

IOException - if the IO operation fails or if the root NBT element is not a compound

NbtSizeValidationException - if the NBT is too deep

See Also:

• readCompressed(InputStream, NbtTagSizeTracker)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/nio/file/Path;Lsw;)Lsn;
intermediary	method_30613	Lnet/minecraft/class_2507;method_30613(Ljava/nio/file/Path;Lnet/minecraft/class_2505;)Lnet/minecraft/class_2487;
named	readCompressed	Lnet/minecraft/nbt/NbtIo;readCompressed(Ljava/nio/file/Path;Lnet/minecraft/nbt/NbtTagSizeTracker;)Lnet/minecraft/nbt/NbtCompound;

decompress

private static DataInputStream decompress(InputStream stream)
                                   throws IOException

Returns a new input stream that decompresses the input stream.

Returns:

a new input stream that decompresses the input stream

Throws:

IOException

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/InputStream;)Ljava/io/DataInputStream;
intermediary	method_40059	Lnet/minecraft/class_2507;method_40059(Ljava/io/InputStream;)Ljava/io/DataInputStream;
named	decompress	Lnet/minecraft/nbt/NbtIo;decompress(Ljava/io/InputStream;)Ljava/io/DataInputStream;

compress

private static DataOutputStream compress(OutputStream stream)
                                  throws IOException

Returns a new output stream that compresses the input stream.

Returns:

a new output stream that compresses the input stream

Throws:

IOException

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/OutputStream;)Ljava/io/DataOutputStream;
intermediary	method_54906	Lnet/minecraft/class_2507;method_54906(Ljava/io/OutputStream;)Ljava/io/DataOutputStream;
named	compress	Lnet/minecraft/nbt/NbtIo;compress(Ljava/io/OutputStream;)Ljava/io/DataOutputStream;

readCompressed

public static NbtCompound readCompressed(InputStream stream,
 NbtTagSizeTracker tagSizeTracker)
                                  throws IOException

Reads an NBT compound from Gzip-compressed stream.

Returns:

the NBT compound from the stream

Throws:

IOException - if the IO operation fails or if the root NBT element is not a compound

NbtSizeValidationException - if the NBT is too deep

See Also:

• readCompressed(Path, NbtTagSizeTracker)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/InputStream;Lsw;)Lsn;
intermediary	method_10629	Lnet/minecraft/class_2507;method_10629(Ljava/io/InputStream;Lnet/minecraft/class_2505;)Lnet/minecraft/class_2487;
named	readCompressed	Lnet/minecraft/nbt/NbtIo;readCompressed(Ljava/io/InputStream;Lnet/minecraft/nbt/NbtTagSizeTracker;)Lnet/minecraft/nbt/NbtCompound;

scanCompressed

public static void scanCompressed(Path path,
 NbtScanner scanner,
 NbtTagSizeTracker tracker)
                           throws IOException

Scans the compressed NBT file using scanner.

Throws:

IOException - if the IO operation fails

NbtSizeValidationException - if the tracker's validation fails

See Also:

• scanCompressed(InputStream, NbtScanner, NbtTagSizeTracker)

API Note:

This method does not return the scan result; the user is expected to call the appropriate method of the NbtScanner subclasses, such as NbtCollector.getRoot().

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/nio/file/Path;Lth;Lsw;)V
intermediary	method_40057	Lnet/minecraft/class_2507;method_40057(Ljava/nio/file/Path;Lnet/minecraft/class_6836;Lnet/minecraft/class_2505;)V
named	scanCompressed	Lnet/minecraft/nbt/NbtIo;scanCompressed(Ljava/nio/file/Path;Lnet/minecraft/nbt/scanner/NbtScanner;Lnet/minecraft/nbt/NbtTagSizeTracker;)V

scanCompressed

public static void scanCompressed(InputStream stream,
 NbtScanner scanner,
 NbtTagSizeTracker tracker)
                           throws IOException

Scans the compressed NBT stream using scanner.

Throws:

IOException - if the IO operation fails

NbtSizeValidationException - if the tracker's validation fails

See Also:

• scanCompressed(Path, NbtScanner, NbtTagSizeTracker)

API Note:

This method does not return the scan result; the user is expected to call the appropriate method of the NbtScanner subclasses, such as NbtCollector.getRoot().

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/InputStream;Lth;Lsw;)V
intermediary	method_40058	Lnet/minecraft/class_2507;method_40058(Ljava/io/InputStream;Lnet/minecraft/class_6836;Lnet/minecraft/class_2505;)V
named	scanCompressed	Lnet/minecraft/nbt/NbtIo;scanCompressed(Ljava/io/InputStream;Lnet/minecraft/nbt/scanner/NbtScanner;Lnet/minecraft/nbt/NbtTagSizeTracker;)V

writeCompressed

public static void writeCompressed(NbtCompound nbt,
 Path path)
                            throws IOException

Writes the Gzip-compressed nbt to the file at path.

Throws:

IOException - if the IO operation fails

See Also:

• writeCompressed(NbtCompound, OutputStream)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Lsn;Ljava/nio/file/Path;)V
intermediary	method_30614	Lnet/minecraft/class_2507;method_30614(Lnet/minecraft/class_2487;Ljava/nio/file/Path;)V
named	writeCompressed	Lnet/minecraft/nbt/NbtIo;writeCompressed(Lnet/minecraft/nbt/NbtCompound;Ljava/nio/file/Path;)V

writeCompressed

public static void writeCompressed(NbtCompound nbt,
 OutputStream stream)
                            throws IOException

Writes the Gzip-compressed nbt to stream.

Throws:

IOException - if the IO operation fails

See Also:

• writeCompressed(NbtCompound, Path)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Lsn;Ljava/io/OutputStream;)V
intermediary	method_10634	Lnet/minecraft/class_2507;method_10634(Lnet/minecraft/class_2487;Ljava/io/OutputStream;)V
named	writeCompressed	Lnet/minecraft/nbt/NbtIo;writeCompressed(Lnet/minecraft/nbt/NbtCompound;Ljava/io/OutputStream;)V

write

public static void write(NbtCompound nbt,
 Path path)
                  throws IOException

Writes the nbt to the file at path.

Throws:

IOException - if the IO operation fails

See Also:

• write(NbtCompound, DataOutput)

Mappings:

Namespace	Name	Mixin selector
official	b	Lta;b(Lsn;Ljava/nio/file/Path;)V
intermediary	method_10630	Lnet/minecraft/class_2507;method_10630(Lnet/minecraft/class_2487;Ljava/nio/file/Path;)V
named	write	Lnet/minecraft/nbt/NbtIo;write(Lnet/minecraft/nbt/NbtCompound;Ljava/nio/file/Path;)V

read

@Nullable
public static @Nullable NbtCompound read(Path path)
                                  throws IOException

Reads an NBT compound from the file atpath.

Returns:

the NBT compound from the file, or null if the file does not exist

Throws:

IOException - if the IO operation fails or if the root NBT element is not a compound

NbtSizeValidationException - if the NBT is too deep

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/nio/file/Path;)Lsn;
intermediary	method_10633	Lnet/minecraft/class_2507;method_10633(Ljava/nio/file/Path;)Lnet/minecraft/class_2487;
named	read	Lnet/minecraft/nbt/NbtIo;read(Ljava/nio/file/Path;)Lnet/minecraft/nbt/NbtCompound;

readCompound

public static NbtCompound readCompound(DataInput input)
                                throws IOException

Reads an NBT compound from input.

Returns:

the NBT compound from the input

Throws:

IOException - if the IO operation fails or if the root NBT element is not a compound

NbtSizeValidationException - if the NBT is too deep

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/DataInput;)Lsn;
intermediary	method_10627	Lnet/minecraft/class_2507;method_10627(Ljava/io/DataInput;)Lnet/minecraft/class_2487;
named	readCompound	Lnet/minecraft/nbt/NbtIo;readCompound(Ljava/io/DataInput;)Lnet/minecraft/nbt/NbtCompound;

readCompound

public static NbtCompound readCompound(DataInput input,
 NbtTagSizeTracker tracker)
                                throws IOException

Reads an NBT compound from input.

Returns:

the NBT compound from the input

Throws:

IOException - if the IO operation fails or if the root NBT element is not a compound

NbtSizeValidationException - if the tracker's validation fails

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/DataInput;Lsw;)Lsn;
intermediary	method_10625	Lnet/minecraft/class_2507;method_10625(Ljava/io/DataInput;Lnet/minecraft/class_2505;)Lnet/minecraft/class_2487;
named	readCompound	Lnet/minecraft/nbt/NbtIo;readCompound(Ljava/io/DataInput;Lnet/minecraft/nbt/NbtTagSizeTracker;)Lnet/minecraft/nbt/NbtCompound;

writeCompound

public static void writeCompound(NbtCompound nbt,
 DataOutput output)
                          throws IOException

Writes the nbt to output.

Throws:

IOException - if the IO operation fails

See Also:

• write(NbtCompound, Path)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Lsn;Ljava/io/DataOutput;)V
intermediary	method_10628	Lnet/minecraft/class_2507;method_10628(Lnet/minecraft/class_2487;Ljava/io/DataOutput;)V
named	writeCompound	Lnet/minecraft/nbt/NbtIo;writeCompound(Lnet/minecraft/nbt/NbtCompound;Ljava/io/DataOutput;)V

scan

public static void scan(DataInput input,
 NbtScanner scanner,
 NbtTagSizeTracker tracker)
                 throws IOException

Scans the NBT input using scanner.

Throws:

IOException - if the IO operation fails

NbtSizeValidationException - if the tracker's validation fails

API Note:

This method does not return the scan result; the user is expected to call the appropriate method of the NbtScanner subclasses, such as NbtCollector.getRoot().

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/DataInput;Lth;Lsw;)V
intermediary	method_39855	Lnet/minecraft/class_2507;method_39855(Ljava/io/DataInput;Lnet/minecraft/class_6836;Lnet/minecraft/class_2505;)V
named	scan	Lnet/minecraft/nbt/NbtIo;scan(Ljava/io/DataInput;Lnet/minecraft/nbt/scanner/NbtScanner;Lnet/minecraft/nbt/NbtTagSizeTracker;)V

read

public static NbtElement read(DataInput input,
 NbtTagSizeTracker tracker)
                       throws IOException

Reads an NBT element from input. Unlike readCompound(DataInput, NbtTagSizeTracker), the element does not have to be a compound.

Returns:

the NBT element from the input

Throws:

IOException - if the IO operation fails

NbtSizeValidationException - if the tracker's validation fails

Mappings:

Namespace	Name	Mixin selector
official	b	Lta;b(Ljava/io/DataInput;Lsw;)Ltk;
intermediary	method_52894	Lnet/minecraft/class_2507;method_52894(Ljava/io/DataInput;Lnet/minecraft/class_2505;)Lnet/minecraft/class_2520;
named	read	Lnet/minecraft/nbt/NbtIo;read(Ljava/io/DataInput;Lnet/minecraft/nbt/NbtTagSizeTracker;)Lnet/minecraft/nbt/NbtElement;

writeForPacket

public static void writeForPacket(NbtElement nbt,
 DataOutput output)
                           throws IOException

Writes the nbt to output. The output is the byte indicating the element type, followed by the NBT data.

Throws:

IOException - if the IO operation fails

See Also:

• read(DataInput, NbtTagSizeTracker)
• write(NbtElement, DataOutput)

API Note:

In vanilla, this is used exclusively in networking.

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ltk;Ljava/io/DataOutput;)V
intermediary	method_52893	Lnet/minecraft/class_2507;method_52893(Lnet/minecraft/class_2520;Ljava/io/DataOutput;)V
named	writeForPacket	Lnet/minecraft/nbt/NbtIo;writeForPacket(Lnet/minecraft/nbt/NbtElement;Ljava/io/DataOutput;)V

writeUnsafe

public static void writeUnsafe(NbtElement nbt,
 DataOutput output)
                        throws IOException

Writes the nbt to output. The output is the byte indicating the element type, followed by an empty string and the NBT data.

When writing an invalid string, this method will throw an error, unlike other methods.

Throws:

IOException - if the IO operation fails

See Also:

• read(DataInput, NbtTagSizeTracker)
• writeForPacket(NbtElement, DataOutput)
• write(NbtElement, DataOutput)

Mappings:

Namespace	Name	Mixin selector
official	b	Lta;b(Ltk;Ljava/io/DataOutput;)V
intermediary	method_10631	Lnet/minecraft/class_2507;method_10631(Lnet/minecraft/class_2520;Ljava/io/DataOutput;)V
named	writeUnsafe	Lnet/minecraft/nbt/NbtIo;writeUnsafe(Lnet/minecraft/nbt/NbtElement;Ljava/io/DataOutput;)V

write

public static void write(NbtElement nbt,
 DataOutput output)
                  throws IOException

Writes the nbt to output. The output is the byte indicating the element type, followed by an empty string and the NBT data.

When writing an invalid string, this method will write an empty string instead of crashing.

Throws:

IOException - if the IO operation fails

See Also:

• read(DataInput, NbtTagSizeTracker)
• writeForPacket(NbtElement, DataOutput)
• writeUnsafe(NbtElement, DataOutput)

Mappings:

Namespace	Name	Mixin selector
official	c	Lta;c(Ltk;Ljava/io/DataOutput;)V
intermediary	method_55324	Lnet/minecraft/class_2507;method_55324(Lnet/minecraft/class_2520;Ljava/io/DataOutput;)V
named	write	Lnet/minecraft/nbt/NbtIo;write(Lnet/minecraft/nbt/NbtElement;Ljava/io/DataOutput;)V

readElement

private static NbtElement readElement(DataInput input,
 NbtTagSizeTracker tracker)
                               throws IOException

Throws:

IOException

Mappings:

Namespace	Name	Mixin selector
official	c	Lta;c(Ljava/io/DataInput;Lsw;)Ltk;
intermediary	method_10626	Lnet/minecraft/class_2507;method_10626(Ljava/io/DataInput;Lnet/minecraft/class_2505;)Lnet/minecraft/class_2520;
named	readElement	Lnet/minecraft/nbt/NbtIo;readElement(Ljava/io/DataInput;Lnet/minecraft/nbt/NbtTagSizeTracker;)Lnet/minecraft/nbt/NbtElement;

readElement

private static NbtElement readElement(DataInput input,
 NbtTagSizeTracker tracker,
 byte typeId)

Mappings:

Namespace	Name	Mixin selector
official	a	Lta;a(Ljava/io/DataInput;Lsw;B)Ltk;
intermediary	method_52892	Lnet/minecraft/class_2507;method_52892(Ljava/io/DataInput;Lnet/minecraft/class_2505;B)Lnet/minecraft/class_2520;
named	readElement	Lnet/minecraft/nbt/NbtIo;readElement(Ljava/io/DataInput;Lnet/minecraft/nbt/NbtTagSizeTracker;B)Lnet/minecraft/nbt/NbtElement;