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authorJune McEnroe <june@causal.agency>2018-11-11 15:45:25 -0500
committerJune McEnroe <june@causal.agency>2018-11-11 15:45:25 -0500
commit57b8d9d45807412fc69cb59d9827f851209c2a23 (patch)
tree0379a7f636aa399a910eed445f1c1d9c37d8ae42 /crc32_combine.3
parentSeparate out adler32_combine.3 (diff)
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+.Dd November 8, 2018
+.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