diff options
| author | June McEnroe <june@causal.agency> | 2018-11-09 00:31:44 -0500 |
|---|---|---|
| committer | June McEnroe <june@causal.agency> | 2018-11-09 00:31:44 -0500 |
| commit | 9f89319dbd42796ebc955f768ba7de9b52c77531 (patch) | |
| tree | 66d9e88452ddf92fd211e93feece68544fcbfff1 /crc32.3 | |
| parent | Add adler32.3 (diff) | |
| download | zlib-man-pages-9f89319dbd42796ebc955f768ba7de9b52c77531.tar.gz zlib-man-pages-9f89319dbd42796ebc955f768ba7de9b52c77531.zip | |
Add crc32_combine.3
Diffstat (limited to 'crc32.3')
| -rw-r--r-- | crc32.3 | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/crc32.3 b/crc32.3 index 66191fd..84c1d65 100644 --- a/crc32.3 +++ b/crc32.3 @@ -4,7 +4,8 @@ . .Sh NAME .Nm crc32 , -.Nm crc32_z +.Nm crc32_z , +.Nm crc32_combine .Nd update CRC-32 checksum . .Sh LIBRARY @@ -16,6 +17,8 @@ .Fn crc32 "uLong crc" "const Bytef *buf" "uInt len" .Ft uLong .Fn crc32_z "uLong crc" "const Bytef *buf" "z_size_t len" +.Ft uLong +.Fn crc32_combine "uLong crc1" "uLong crc2" "z_off_t len2" . .Sh DESCRIPTION Update a running CRC-32 with the bytes @@ -41,6 +44,33 @@ but with a .Vt size_t length. . +.Pp +.Fn crc32_combine +combines 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 EXAMPLES .Bd -literal -offset indent uLong crc = crc32(0L, Z_NULL, 0); |