package net.jpountz.example;
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import net.jpountz.xxhash.StreamingXXHash32;
import net.jpountz.xxhash.XXHash32;
import net.jpountz.xxhash.XXHashFactory;
public class XXHashExample {
public static void main(String[] args) throws Exception {
blockExample();
streamingExample();
}
private static void blockExample() throws UnsupportedEncodingException {
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);
}
private static void streamingExample() throws IOException {
XXHashFactory factory = XXHashFactory.fastestInstance();
byte[] data = "12345345234572".getBytes("UTF-8");
ByteArrayInputStream in = new ByteArrayInputStream(data);
int seed = 0x9747b28c; // used to initialize the hash value, use whatever
// value you want, but always the same
StreamingXXHash32 hash32 = factory.newStreamingHash32(seed);
byte[] buf = new byte[8]; // for real-world usage, use a larger buffer, like 8192 bytes
for (;;) {
int read = in.read(buf);
if (read == -1) {
break;
}
hash32.update(buf, 0, read);
}
int hash = hash32.getValue();
System.out.println("Streaming hash: " + hash);
}
}