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.TH VENTI-ZERO 2
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.SH NAME
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vtzerotruncate, vtzeroextend, vtzeroscore \- Venti block truncation
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.SH SYNOPSIS
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.ft L
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#include <u.h>
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.br
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#include <libc.h>
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.br
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#include <venti.h>
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.ta +\w'\fLuint 'u
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.PP
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.B
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uint	vtzerotruncate(int type, uchar *buf, uint size)
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.PP
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.B
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void	vtzeroextend(int type, uchar *buf, uint size, uint newsize)
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.PP
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.B
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extern uchar vtzeroscore[VtScoreSize];
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.SH DESCRIPTION
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These utility functions compute how to truncate or replace
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trailing zeros (for data blocks) or trailing zero scores
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(for pointer blocks) to canonicalize the blocks before
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storing them to Venti.
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.PP
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.I Vtzerotruncate
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returns the size of the
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.IR size -byte
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buffer pointed to by
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.I buf
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ignoring trailing zeros or zero scores,
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according to the given
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.IR type .
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.PP
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.I Vtzeroextend
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pads
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.I buf
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with zeros or zero scores,
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according to the given
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.IR type ,
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to grow it from
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.I size
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bytes to
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.I newsize
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bytes.
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.PP
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.I Vtzeroscore
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is the score of the zero-length block.
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.SH SOURCE
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.B /sys/src/libventi/zero.c
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.br
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.B /sys/src/libventi/zeroscore.c
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.SH SEE ALSO
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.IR venti (2),
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.IR venti (6)