Class HuffmanCodec

java.lang.Object

io.helidon.common.buffers.HuffmanCodec

public final class HuffmanCodec
extends Object

HPACK and QPACK Huffman codec defined by RFC 7541, Appendix B.

Method Summary

Modifier and Type	Method	Description
static int	decode(BufferData source, int encodedLength, byte[] destination)	Decode bytes into a destination byte array.
static void	decode(BufferData source, int encodedLength, Appendable destination)	Decode bytes into an appendable.
static int	encode(CharSequence value, byte[] destination)	Encode a value into a destination byte array.
static int	encodedLength(CharSequence value)	Calculate the encoded length of a value.

Methods inherited from class Object

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

Method Details

encodedLength

public static int encodedLength(CharSequence value)

Calculate the encoded length of a value.

Parameters:

value - octet-valued characters to encode

Returns:

encoded byte count

Throws:

IllegalArgumentException - if a character is outside the octet range or the encoded length exceeds the supported array range

encode

public static int encode(CharSequence value,
 byte[] destination)

Encode a value into a destination byte array.

If encoding is unsuccessful, the destination contents are undefined and must be discarded. A destination that is too small can be detected before all characters have been validated.

Parameters:

value - octet-valued characters to encode

destination - destination byte array

Returns:

encoded byte count, or -1 if the destination is too small

Throws:

IllegalArgumentException - if a character is outside the octet range

decode

public static int decode(BufferData source,
 int encodedLength,
 byte[] destination)

Decode bytes into a destination byte array.

Invalid input may partially advance the source and modify the destination. Range and capacity failures are detected before either is modified.

Parameters:

source - encoded bytes

encodedLength - encoded byte count

destination - decoded byte destination

Returns:

decoded byte count

Throws:

IndexOutOfBoundsException - if the encoded range exceeds the source or the destination cannot hold the maximum possible decoded value

IllegalArgumentException - if the input is malformed

decode

public static void decode(BufferData source,
 int encodedLength,
 Appendable destination)

Decode bytes into an appendable.

Invalid input or an append failure may partially advance the source and modify the destination. Range failures are detected before either is modified.

Parameters:

source - encoded bytes

encodedLength - encoded byte count

destination - decoded character destination

Throws:

IndexOutOfBoundsException - if the encoded range exceeds the source

IllegalArgumentException - if the input is malformed

UncheckedIOException - if appending fails