Manpages: Move manpages (back?) into the top-level directory.

[mLib] / man / crc32.3

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-.\" -*-nroff-*-
-.ie t \{\
-.  ds ss \s8\u
-.  ds se \d\s0
-.\}
-.el \{\
-.  ds ss ^
-.  ds se
-.\}
-.TH crc32 3 "8 May 1999" "Straylight/Edgeware" "mLib utilities library"
-.SH NAME
-crc32 \- calculate 32-bit CRC
-.\" @crc32
-.SH SYNOPSIS
-.nf
-.B "#include <mLib/crc32.h>"
-
-.BI "uint32 crc32(uint32 " crc ", const void *" buf ", size_t " sz );
-.BI CRC32( result ", " crc ", " buf ", " sz )
-.fi
-.SH DESCRIPTION
-The
-.B crc32
-function calculates a 32-bit cyclic redundancy check of the data block
-at address
-.I buf
-and size
-.I sz
-passed to it.
-.PP
-The function is restartable.  For a first call, pass zero as the value
-of the
-.I crc
-argument; for subsequent blocks, pass in the previous output.  The final
-answer is equal to the result you'd get from computing a CRC over the
-concatenation of the individual blocks.
-.PP
-The
-.B CRC32
-macro calculates a CRC inline.  The calculated CRC value is placed in
-the variable named by
-.IR result .
-Only use the macro version when efficiency is a major concern: it makes
-the code rather harder to read.
-.PP
-Note that a CRC is not cryptographically strong: it's fairly easy for an
-adversary to construct blocks of data with any desired CRC, or to modify
-a given block in a way which doesn't change its (unknown) CRC.
-.PP
-The exact behaviour of the CRC is beyond the scope of this manual;
-suffice to say that the result is, in some suitable representation, the
-remainder after division by a degree-32 polynomial in GF(2)[x].
-.SH "RETURN VALUE"
-The return value is the 32-bit CRC of the input block.
-.SH "SEE ALSO"
-.BR unihash (3),
-.BR mLib (3).
-.SH AUTHOR
-Mark Wooding, <mdw@distorted.org.uk>