Package io.delta.kernel.internal.deletionvectors

Class Base85Codec

Object

io.delta.kernel.internal.deletionvectors.Base85Codec

public final class Base85Codec
extends Object

This implements Base85 using the 4 byte block aligned encoding and character set from Z85.

See Also:

• Z85 encoding

  Taken from https://github.com/delta-io/delta/blob/master/spark/src/main/scala/org/apache/spark /sql/delta/util/Codec.scala

Field Summary

Fields

Modifier and Type	Field	Description
static final byte[]	DECODE_MAP
static final byte[]	ENCODE_MAP
static final int	ENCODED_UUID_LENGTH

Constructor Summary

Constructors

Constructor	Description
Base85Codec()

Method Summary

Modifier and Type	Method	Description
static byte[]	decodeAlignedBytes(String encoded)	Decode an arbitrary byte array.
static byte[]	decodeBytes(String encoded, int outputLength)	Decode an arbitrary byte array.
static UUID	decodeUUID(String encoded)	Decode a 16 byte UUID.
static String	encodeBytes(byte[] input)	Encode an arbitrary byte array.
static String	encodeUUID(UUID id)	Encode a 16 byte UUID.

Methods inherited from class java.lang.Object

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

Field Details

ENCODED_UUID_LENGTH

public static final int ENCODED_UUID_LENGTH

See Also:

• Constant Field Values

ENCODE_MAP

public static final byte[] ENCODE_MAP

DECODE_MAP

public static final byte[] DECODE_MAP

Constructor Details

Base85Codec

public Base85Codec()

Method Details

decodeUUID

public static UUID decodeUUID(String encoded)

Decode a 16 byte UUID.

decodeBytes

public static byte[] decodeBytes(String encoded,
 int outputLength)

Decode an arbitrary byte array.

Only `outputLength` bytes will be returned. Any extra bytes, such as padding added because the input was unaligned, will be dropped.

decodeAlignedBytes

public static byte[] decodeAlignedBytes(String encoded)

Decode an arbitrary byte array.

Output may contain padding bytes, if the input was not 4 byte aligned. Use [[decodeBytes]] in that case and specify the expected number of output bytes without padding.

encodeUUID

public static String encodeUUID(UUID id)

Encode a 16 byte UUID.

encodeBytes

public static String encodeBytes(byte[] input)

Encode an arbitrary byte array.

Unaligned input will be padded to a multiple of 4 bytes.