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	tventi-zero.3 - plan9port - [fork] Plan 9 from user space
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	tventi-zero.3 (1063B)
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	1 .TH VENTI-ZERO 3
	2 .SH NAME
	3 vtzerotruncate, vtzeroextend, vtzeroscore \- Venti block truncation
	4 .SH SYNOPSIS
	5 .ft L
	6 #include <u.h>
	7 .br
	8 #include <libc.h>
	9 .br
	10 #include <venti.h>
	11 .ta +\w'\fLuint 'u
	12 .PP
	13 .B
	14 uint vtzerotruncate(int type, uchar *buf, uint size)
	15 .PP
	16 .B
	17 void vtzeroextend(int type, uchar *buf, uint size, uint newsize)
	18 .PP
	19 .B
	20 extern uchar vtzeroscore[VtScoreSize];
	21 .SH DESCRIPTION
	22 These utility functions compute how to truncate or replace
	23 trailing zeros (for data blocks) or trailing zero scores
	24 (for pointer blocks) to canonicalize the blocks before
	25 storing them to Venti.
	26 .PP
	27 .I Vtzerotruncate
	28 returns the size of the
	29 .IR size -byte
	30 buffer pointed to by
	31 .I buf
	32 ignoring trailing zeros or zero scores,
	33 according to the given
	34 .IR type .
	35 .PP
	36 .I Vtzeroextend
	37 pads
	38 .I buf
	39 with zeros or zero scores,
	40 according to the given
	41 .IR type ,
	42 to grow it from
	43 .I size
	44 bytes to
	45 .I newsize
	46 bytes.
	47 .PP
	48 .I Vtzeroscore
	49 is the score of the zero-length block.
	50 .SH SOURCE
	51 .B \*9/src/libventi/zero.c
	52 .br
	53 .B \*9/src/libventi/zeroscore.c
	54 .SH SEE ALSO
	55 .MR venti (3) ,
	56 .MR venti (7)