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/usr/include/rados/crc32c.h is in librados-dev 0.41-1ubuntu2.

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#ifndef CEPH_CRC32C_H
#define CEPH_CRC32C_H

#ifdef __cplusplus
extern "C" {
#endif

uint32_t ceph_crc32c_le(uint32_t crc, unsigned char const *data, unsigned length);

#ifdef __cplusplus
}
#endif

#endif