| .TH VENTI-ZERO 3 |
| .SH NAME |
| vtzerotruncate, vtzeroextend, vtzeroscore \- Venti block truncation |
| .SH SYNOPSIS |
| .ft L |
| #include <u.h> |
| .br |
| #include <libc.h> |
| .br |
| #include <venti.h> |
| .ta +\w'\fLuint 'u |
| .PP |
| .B |
| uint vtzerotruncate(int type, uchar *buf, uint size) |
| .PP |
| .B |
| void vtzeroextend(int type, uchar *buf, uint size, uint newsize) |
| .PP |
| .B |
| extern uchar vtzeroscore[VtScoreSize]; |
| .SH DESCRIPTION |
| These utility functions compute how to truncate or replace |
| trailing zeros (for data blocks) or trailing zero scores |
| (for pointer blocks) to canonicalize the blocks before |
| storing them to Venti. |
| .PP |
| .I Vtzerotruncate |
| returns the size of the |
| .IR size -byte |
| buffer pointed to by |
| .I buf |
| ignoring trailing zeros or zero scores, |
| according to the given |
| .IR type . |
| .PP |
| .I Vtzeroextend |
| pads |
| .I buf |
| with zeros or zero scores, |
| according to the given |
| .IR type , |
| to grow it from |
| .I size |
| bytes to |
| .I newsize |
| bytes. |
| .PP |
| .I Vtzeroscore |
| is the score of the zero-length block. |
| .SH SOURCE |
| .B \*9/src/libventi/zero.c |
| .br |
| .B \*9/src/libventi/zeroscore.c |
| .SH SEE ALSO |
| .IR venti (3), |
| .IR venti (7) |
