获取Objective-C中NSData的CRC校验和

在这里查找用于NSData的CRC32

http://classroomm.com/objective-c/index.php?action=printpage;topic=2891.0

crc32() 功能来自 zlib 图书馆:

#import <zlib.h>

NSData *data;

// ...

unsigned long result = crc32(0, data.bytes, data.length);
NSLog(@"CRC32: %lu", result);

libz

从iOS11开始使用:

unsigned long result = crc32_z(0, data.bytes, data.length);