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.Dd January 15, 2017
.Dt CRC32_COMBINE 3
.Os
.
.Sh NAME
.Nm crc32_combine
.Nd combine CRC-32 checksums
.
.Sh LIBRARY
.Lb libz
.
.Sh SYNOPSIS
.In zlib.h
.Ft uLong
.Fn crc32_combine "uLong crc1" "uLong crc2" "z_off_t len2"
.
.Sh DESCRIPTION
Combine two CRC-32 check values into one.
For two sequences of bytes,
.Va seq1
and
.Va seq2
with lengths
.Va len1
and
.Va len2 ,
CRC-32 check values were calculated for each,
.Va crc1
and
.Va crc2 .
.Fn crc32_combine
returns the CRC-32 check value of
.Va seq1
and
.Va seq2
concatenated,
requiring only
.Fa crc1 ,
.Fa crc2 ,
and
.Fa len2 .
.
.Sh SEE ALSO
.Xr crc32 3
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