com.google.common.hash.Hashing.crc32()方法的使用及代码示例

x33g5p2x  于2022-01-19 转载在 其他  
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本文整理了Java中com.google.common.hash.Hashing.crc32()方法的一些代码示例，展示了Hashing.crc32()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Hashing.crc32()方法的具体详情如下：
包路径：com.google.common.hash.Hashing
类名称：Hashing
方法名：crc32

Hashing.crc32介绍

[英]Returns a hash function implementing the CRC-32 checksum algorithm (32 hash bits).

To get the long value equivalent to Checksum#getValue() for a HashCode produced by this function, use HashCode#padToLong().

This function is best understood as a checksum rather than a true hash function.
[中]返回实现CRC-32校验和算法的哈希函数（32个哈希位）。
要获取此函数生成的HashCode的与Checksum#getValue（）等价的长值，请使用HashCode#padToLong（）。
最好将此函数理解为checksum，而不是真正的hash function。

代码示例

代码示例来源：origin: Graylog2/graylog2-server

@Override
protected String getDigest(String value) {
  return Hashing.crc32().hashString(value, StandardCharsets.UTF_8).toString();
}

代码示例来源：origin: google/guava

public void testCrc32() {
 HashTestUtils.assertInvariants(Hashing.crc32());
 assertEquals("Hashing.crc32()", Hashing.crc32().toString());
}

代码示例来源：origin: Netflix/EVCache

hf = Hashing.crc32();
break;

代码示例来源：origin: omero/common

protected CRC32ChecksumProviderImpl() {
  super(Hashing.crc32());
}

代码示例来源：origin: com.android.tools.build/builder

/**
 * Computes the hashcode of the cached file.
 *
 * @return the hash code
 */
@Nullable
private HashCode hashFile() {
  try {
    return Files.hash(mFile, Hashing.crc32());
  } catch (IOException e) {
    return null;
  }
}

代码示例来源：origin: jclouds/legacy-jclouds

@Override
public ToStringHelper string() {
 ToStringHelper toString = super.string();
 if (groupNames.size() != 0)
   toString.add("groupNames", groupNames);
 if (noKeyPair)
   toString.add("noKeyPair", noKeyPair);
 toString.add("keyPair", keyPair);
 if (userData != null && userData.size() > 0)
   toString.add("userDataCksum", Hashing.crc32().hashBytes(Bytes.toArray(userData)));
 ImmutableSet<BlockDeviceMapping> mappings = blockDeviceMappings.build();
 if (mappings.size() != 0)
   toString.add("blockDeviceMappings", mappings);
 return toString;
}

代码示例来源：origin: org.jclouds.api/ec2

@Override
public ToStringHelper string() {
 ToStringHelper toString = super.string();
 if (groupNames.size() != 0)
   toString.add("groupNames", groupNames);
 if (noKeyPair)
   toString.add("noKeyPair", noKeyPair);
 toString.add("keyPair", keyPair);
 if (userData != null && userData.size() > 0)
   toString.add("userDataCksum", Hashing.crc32().hashBytes(Bytes.toArray(userData)));
 ImmutableSet<BlockDeviceMapping> mappings = blockDeviceMappings.build();
 if (mappings.size() != 0)
   toString.add("blockDeviceMappings", mappings);
 return toString;
}

代码示例来源：origin: com.amysta.jclouds.api/ec2

@Override
public ToStringHelper string() {
 ToStringHelper toString = super.string();
 if (!groupNames.isEmpty())
   toString.add("groupNames", groupNames);
 if (noKeyPair)
   toString.add("noKeyPair", noKeyPair);
 toString.add("keyPair", keyPair);
 if (userData != null && !userData.isEmpty())
   toString.add("userDataCksum", Hashing.crc32().hashBytes(Bytes.toArray(userData)));
 ImmutableSet<BlockDeviceMapping> mappings = blockDeviceMappings.build();
 if (!mappings.isEmpty())
   toString.add("blockDeviceMappings", mappings);
 if (maxCount != null && maxCount.intValue() > 0)
   toString.add("maxCount", maxCount);
 if (clientToken != null)
   toString.add("clientToken", clientToken);
 return toString;
}

代码示例来源：origin: apache/jclouds

@Override
public ToStringHelper string() {
 ToStringHelper toString = super.string();
 if (!groupNames.isEmpty())
   toString.add("groupNames", groupNames);
 if (noKeyPair)
   toString.add("noKeyPair", noKeyPair);
 toString.add("keyPair", keyPair);
 if (userData != null && !userData.isEmpty())
   toString.add("userDataCksum", Hashing.crc32().hashBytes(Bytes.toArray(userData)));
 ImmutableSet<BlockDeviceMapping> mappings = blockDeviceMappings.build();
 if (!mappings.isEmpty())
   toString.add("blockDeviceMappings", mappings);
 if (maxCount != null && maxCount.intValue() > 0)
   toString.add("maxCount", maxCount);
 if (clientToken != null)
   toString.add("clientToken", clientToken);
 return toString;
}

代码示例来源：origin: molgenis/molgenis

private String createFingerprint(Class<?> contextClass, String resourceName) throws IOException {
  byte[] bytes =
    contextClass != null
      ? ResourceUtils.getBytes(contextClass, resourceName)
      : ResourceUtils.getBytes(resourceName);
  HashCode crc32 = Hashing.crc32().hashBytes(bytes);
  return Base64.getUrlEncoder().withoutPadding().encodeToString(crc32.asBytes());
 }
}

代码示例来源：origin: indeedeng/util

public static long computeFileChecksum(@Nonnull final File file, @Nonnull final Checksum checksum) throws IOException {
  return ByteStreams.hash(com.google.common.io.Files.newInputStreamSupplier(file), Hashing.crc32())
    .padToLong();
}

代码示例来源：origin: org.molgenis/molgenis-core

private String createFingerprint(Class<?> contextClass, String resourceName) throws IOException {
  byte[] bytes =
    contextClass != null
      ? ResourceUtils.getBytes(contextClass, resourceName)
      : ResourceUtils.getBytes(resourceName);
  HashCode crc32 = Hashing.crc32().hashBytes(bytes);
  return BaseEncoding.base64Url().omitPadding().encode(crc32.asBytes());
 }
}

代码示例来源：origin: com.conveyal/r5

/**
 * FIXME why is this a long when crc32 returns an int?
 * @return a checksum of the graph, for use in verifying whether it changed or remained the same after
 * some operation.
 */
public long checksum () {
  LOG.info("Calculating transport network checksum...");
  try {
    File tempFile = File.createTempFile("r5-network-checksum-", ".dat");
    tempFile.deleteOnExit();
    KryoNetworkSerializer.write(this, tempFile);
    HashCode crc32 = Files.hash(tempFile, Hashing.crc32());
    tempFile.delete();
    LOG.info("Network CRC is {}", crc32.hashCode());
    return crc32.hashCode();
  } catch (IOException e) {
    throw new RuntimeException();
  }
}

代码示例来源：origin: org.molgenis/molgenis-core-ui

private String createFingerprint(String themeUri) throws IOException, MolgenisStyleException {
 String fileName = extractThemeNameFromThemeUri(themeUri);
 BootstrapVersion version = extractBootstrapVersionFromPath(themeUri);
 FileSystemResource styleData = styleService.getThemeData(fileName, version);
 byte[] bytes = IOUtils.toByteArray(styleData.getInputStream());
 HashCode crc32 = Hashing.crc32().hashBytes(bytes);
 return BaseEncoding.base64Url().omitPadding().encode(crc32.asBytes());
}

代码示例来源：origin: com.google.guava/guava-tests

public void testCrc32() {
 HashTestUtils.assertInvariants(Hashing.crc32());
 assertEquals("Hashing.crc32()", Hashing.crc32().toString());
}

代码示例来源：origin: com.google.guava/guava-tests

private byte runHashFunction(int reps, HashFunction hashFunction) {
  byte result = 0x01;
  // Trick the JVM to prevent it from using the hash function non-polymorphically
  result ^= Hashing.crc32().hashInt(reps).asBytes()[0];
  result ^= Hashing.adler32().hashInt(reps).asBytes()[0];
  for (int i = 0; i < reps; i++) {
   result ^= hashFunction.hashBytes(testBytes).asBytes()[0];
  }
  return result;
 }
}

代码示例来源：origin: com.android.tools.build/builder

private static void configureStoredEntry(JarEntry entry, File inputFile) throws IOException {
  ByteSource byteSource = Files.asByteSource(inputFile);
  long size = inputFile.length();
  entry.setMethod(ZipEntry.STORED);
  entry.setSize(size);
  entry.setCompressedSize(size);
  entry.setCrc(byteSource.hash(Hashing.crc32()).padToLong());
}

代码示例来源：origin: com.google.guava/guava-tests

@Benchmark byte crc32HashFunction(int reps) {
 return runHashFunction(reps, Hashing.crc32());
}

代码示例来源：origin: com.yahoo.pulsar/pulsar-broker

/**
 * Default constructor.
 *
 * @throws PulsarServerException
 */
public NamespaceService(PulsarService pulsar) {
  this.pulsar = pulsar;
  host = pulsar.getAdvertisedAddress();
  this.config = pulsar.getConfiguration();
  this.loadManager = pulsar.getLoadManager();
  ServiceUnitZkUtils.initZK(pulsar.getLocalZkCache().getZooKeeper(), pulsar.getBrokerServiceUrl());
  this.bundleFactory = new NamespaceBundleFactory(pulsar, Hashing.crc32());
  this.ownershipCache = new OwnershipCache(pulsar, bundleFactory);
}

代码示例来源：origin: org.apache.pulsar/pulsar-broker

/**
 * Default constructor.
 *
 * @throws PulsarServerException
 */
public NamespaceService(PulsarService pulsar) {
  this.pulsar = pulsar;
  host = pulsar.getAdvertisedAddress();
  this.config = pulsar.getConfiguration();
  this.loadManager = pulsar.getLoadManager();
  ServiceUnitZkUtils.initZK(pulsar.getLocalZkCache().getZooKeeper(), pulsar.getBrokerServiceUrl());
  this.bundleFactory = new NamespaceBundleFactory(pulsar, Hashing.crc32());
  this.ownershipCache = new OwnershipCache(pulsar, bundleFactory);
  this.namespaceClients = new ConcurrentOpenHashMap<>();
}

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