Class Crc32HashFunction

java.lang.Object

cloud.opencode.base.hash.function.AbstractHashFunction

cloud.opencode.base.hash.function.Crc32HashFunction

All Implemented Interfaces:

HashFunction

public final class Crc32HashFunction
extends AbstractHashFunction

CRC32 hash function implementation CRC32 哈希函数实现

Provides CRC32 and CRC32C (Castagnoli) hash functions using the JDK's built-in implementations.

使用 JDK 内置实现提供 CRC32 和 CRC32C (Castagnoli) 哈希函数。

Features | 主要功能:

• Standard CRC32 - 标准CRC32
• CRC32C (Castagnoli) - CRC32C (Castagnoli)
• Hardware acceleration when available - 硬件加速（可用时）

Usage Examples | 使用示例:

// Standard CRC32
HashCode hash = Crc32HashFunction.crc32().hashBytes(data);

// CRC32C (faster on modern CPUs)
HashCode hashC = Crc32HashFunction.crc32c().hashBytes(data);

Security | 安全性:

• Thread-safe: Yes - 线程安全: 是
• Not for cryptographic use - 不用于加密用途

Performance | 性能特性:

• Time complexity: O(n) where n = input size - O(n), n为输入大小
• Space complexity: O(1) - O(1)

Since:

JDK 25, opencode-base-hash V1.0.0

Author:

Leon Soo www.LeonSoo.com

See Also:

• OpenCode.cloud

Nested Class Summary

Nested classes/interfaces inherited from class AbstractHashFunction

AbstractHashFunction.AbstractHasher, AbstractHashFunction.BufferedHasher

Field Summary

Fields inherited from class AbstractHashFunction

bits, name

Method Summary

Modifier and Type	Method	Description
static Crc32HashFunction	crc32()	Creates a standard CRC32 function 创建标准CRC32函数
static Crc32HashFunction	crc32c()	Creates a CRC32C (Castagnoli) function 创建CRC32C (Castagnoli) 函数
HashCode	hashBytes(byte[] input, int offset, int length)	Computes hash of a byte array portion 计算字节数组部分的哈希
Hasher	newHasher()	Creates a new Hasher instance for streaming hash computation 创建新的Hasher实例用于流式哈希计算

Methods inherited from class AbstractHashFunction

bits, hashBytes, hashInt, hashLong, hashObject, name, newHasher, toString

Methods inherited from class Object

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

Methods inherited from interface HashFunction

hashFile, hashInputStream, hashString, hashUtf8

Method Details

crc32

public static Crc32HashFunction crc32()

Creates a standard CRC32 function 创建标准CRC32函数

Returns:

hash function | 哈希函数

crc32c

public static Crc32HashFunction crc32c()

Creates a CRC32C (Castagnoli) function 创建CRC32C (Castagnoli) 函数

CRC32C is optimized for hardware acceleration on modern CPUs.

CRC32C 在现代 CPU 上针对硬件加速进行了优化。

Returns:

hash function | 哈希函数

newHasher

public Hasher newHasher()

Description copied from interface: HashFunction

Creates a new Hasher instance for streaming hash computation 创建新的Hasher实例用于流式哈希计算

Returns:

a new Hasher (stateful, not thread-safe) | 新的Hasher（有状态，非线程安全）

hashBytes

public HashCode hashBytes(byte[] input,
 int offset,
 int length)

Description copied from interface: HashFunction

Computes hash of a byte array portion 计算字节数组部分的哈希

Parameters:

input - input bytes | 输入字节

offset - starting offset | 起始偏移

length - number of bytes to hash | 要哈希的字节数

Returns:

hash code | 哈希码