Package org.klomp.snark.v2

Class V2Util

java.lang.Object

org.klomp.snark.v2.V2Util

public class V2Util
extends Object

Merkle utilities

Since:

0.9.71

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MIN

Constructor Summary

Constructors

Constructor	Description
V2Util()

Method Summary

Modifier and Type	Method	Description
static List<MerkleHash>	calculateMerklePieces(File f, int plen)
static MerkleHash	calculateMerkleRoot(byte[] b)
static MerkleHash	calculateMerkleRoot(File f)
static MerkleHash	calculateMerkleRoot(InputStream in, int plen)	Warning: Will return bad value if plen is greater than the next power of two of the input size
static MerkleHash	calculateMerkleRoot(List<MerkleHash> pieces, int plen)
static boolean	checkMerkle(MerkleHash root, List<MerkleHash> pieces, int plen)
static boolean	isValidPieceLength(int plen)	16K min and power of two Storage.MAX_PIECE_SIZE is checked elsewhere but do it here also.
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Field Details

MIN

public static final int MIN

See Also:

• Constant Field Values

Constructor Details

V2Util

public V2Util()

Method Details

isValidPieceLength

public static boolean isValidPieceLength(int plen)

16K min and power of two Storage.MAX_PIECE_SIZE is checked elsewhere but do it here also.

checkMerkle

public static boolean checkMerkle(MerkleHash root,
 List<MerkleHash> pieces,
 int plen)

Parameters:

pieces - two minimum

plen - piece length, 16K minimum, power of two

calculateMerkleRoot

public static MerkleHash calculateMerkleRoot(List<MerkleHash> pieces,
 int plen)

Parameters:

pieces - two minimum

plen - piece length, 16K minimum, power of two

calculateMerkleRoot

public static MerkleHash calculateMerkleRoot(File f)
                                      throws IOException

Returns:

the root hash

Throws:

IOException

calculateMerkleRoot

public static MerkleHash calculateMerkleRoot(byte[] b)
                                      throws IOException

Returns:

the root hash

Throws:

IOException

calculateMerkleRoot

public static MerkleHash calculateMerkleRoot(InputStream in,
 int plen)
                                      throws IOException

Warning: Will return bad value if plen is greater than the next power of two of the input size

Parameters:

plen - piece length, will be rectified to next power of two 16K min

Returns:

the root hash

Throws:

IOException

calculateMerklePieces

public static List<MerkleHash> calculateMerklePieces(File f,
 int plen)
                                              throws IOException

Parameters:

plen - will use only if smaller than file size

Returns:

the piece hashes

Throws:

IOException

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception