Package com.marksayson.deletionchecker.checksum

Class Crc32c

java.lang.Object

com.marksayson.deletionchecker.checksum.Crc32c

public final class Crc32c
extends Object

CRC32C (Castagnoli, 32-bit) — the integrity check on each packed entity-type file.

Delegates to CRC32C, which the JVM accelerates with the CPU's CRC instruction where available. CRC32C detects accidental corruption and truncation (bit flips, burst errors); it is not a defense against a deliberately crafted collision, which is outside the dataset's threat model. The manifest's SHA-256 (see Sha256) is the trust anchor above it.

Method Summary

Modifier and Type	Method	Description
static long	of(byte[] data)	Returns the CRC32C of data.
static long	of(ByteBuffer data)	Returns the CRC32C of data's remaining bytes, leaving its position and limit unchanged.

Methods inherited from class java.lang.Object

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

Method Details

of

public static long of(byte[] data)

Returns the CRC32C of data.

Parameters:

data - the bytes to checksum

Returns:

the CRC32C as an unsigned 32-bit value (0 to 2^32 - 1) in the low bits of the result

of

public static long of(ByteBuffer data)

Returns the CRC32C of data's remaining bytes, leaving its position and limit unchanged.

Parameters:

data - the bytes to checksum, from position to limit

Returns:

the CRC32C as an unsigned 32-bit value (0 to 2^32 - 1) in the low bits of the result