xxhash block hashing

BlockXXHash.java

XXHashFactory factory = XXHashFactory.fastestInstance();

byte[] data = "12345345234572".getBytes("UTF-8");

XXHash32 hash32 = factory.hash32();
int seed = 0x9747b28c; // used to initialize the hash value, use whatever
                       // value you want, but always the same
int hash = hash32.hash(data, 0, data.length, seed);
System.out.println("Block hash: " + hash);