org.web3j.rlp

Class RlpDecoder

java.lang.Object

org.web3j.rlp.RlpDecoder

public class RlpDecoder
extends java.lang.Object

Recursive Length Prefix (RLP) decoder.

For the specification, refer to p16 of the yellow paper and here.

Field Summary

Fields

Modifier and Type	Field and Description
static int	OFFSET_LONG_LIST [0xf7] If the total payload of a list is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xf7 plus the length of the length of the list in binary form, followed by the length of the list, followed by the concatenation of the RLP encodings of the items.
static int	OFFSET_LONG_STRING [0xb7] If a string is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xb7 plus the length of the length of the string in binary form, followed by the length of the string, followed by the string.
static int	OFFSET_SHORT_LIST [0xc0] If the total payload of a list (i.e.
static int	OFFSET_SHORT_STRING [0x80] If a string is 0-55 bytes long, the RLP encoding consists of a single byte with value 0x80 plus the length of the string followed by the string.

Constructor Summary

Constructors

Constructor and Description
RlpDecoder()

Method Summary

Modifier and Type	Method and Description
static RlpList	decode(byte[] rlpEncoded) Parse wire byte[] message into RLP elements.

Methods inherited from class java.lang.Object

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

Field Detail

OFFSET_SHORT_STRING

public static int OFFSET_SHORT_STRING

[0x80] If a string is 0-55 bytes long, the RLP encoding consists of a single byte with value 0x80 plus the length of the string followed by the string. The range of the first byte is thus [0x80, 0xb7].

OFFSET_LONG_STRING

public static int OFFSET_LONG_STRING

[0xb7] If a string is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xb7 plus the length of the length of the string in binary form, followed by the length of the string, followed by the string. For example, a length-1024 string would be encoded as \xb9\x04\x00 followed by the string. The range of the first byte is thus [0xb8, 0xbf].

OFFSET_SHORT_LIST

public static int OFFSET_SHORT_LIST

[0xc0] If the total payload of a list (i.e. the combined length of all its items) is 0-55 bytes long, the RLP encoding consists of a single byte with value 0xc0 plus the length of the list followed by the concatenation of the RLP encodings of the items. The range of the first byte is thus [0xc0, 0xf7].

OFFSET_LONG_LIST

public static int OFFSET_LONG_LIST

[0xf7] If the total payload of a list is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xf7 plus the length of the length of the list in binary form, followed by the length of the list, followed by the concatenation of the RLP encodings of the items. The range of the first byte is thus [0xf8, 0xff].

Constructor Detail

RlpDecoder

public RlpDecoder()

Method Detail

decode

public static RlpList decode(byte[] rlpEncoded)

Parse wire byte[] message into RLP elements.

Parameters:

rlpEncoded - - RLP encoded byte-array

Returns:

recursive RLP structure