javacrc32算法实现,java.util.zip.CRC32中的CRC32实现

Which CRC-32 algorithm is used in the Java CRC-32 class ? The java doc does not give any details. What is the polynomail used and the initial value for calculaton ?

解决方案

According to the source:

Computes CRC32 data checksum of a data stream. The actual CRC32

algorithm is described in RFC 1952 (GZIP file format specification

version 4.3). Can be used to get the CRC32 over a stream if used

with checked input/output streams.

The RFC1952 can be found here, but presents a quite technical read.

The initial value for the CRC is 0xFFFFFFFF, and the CRC table is built the first time the class is loaded on the VM.