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 and Description
static byte[]	DECODE_MAP
static byte[]	ENCODE_MAP
static int	ENCODED_UUID_LENGTH

Constructor Summary

Constructors

Constructor and Description
Base85Codec()

Method Summary

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

Methods inherited from class Object

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

Field Detail

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 Detail

Base85Codec

public Base85Codec()

Method Detail

decodeUUID

public static java.util.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(java.util.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.