| rsc | be7cbb4 | 2005-07-12 15:24:18 +0000 | [diff] [blame] | 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, |
| rsc | 3aec33f | 2005-07-18 22:41:58 +0000 | [diff] [blame] | 33 | according to the given |
| rsc | be7cbb4 | 2005-07-12 15:24:18 +0000 | [diff] [blame] | 34 | .IR type . |
| 35 | .PP |
| 36 | .I Vtzeroextend |
| 37 | pads |
| 38 | .I buf |
| 39 | with zeros or zero scores, |
| rsc | 3aec33f | 2005-07-18 22:41:58 +0000 | [diff] [blame] | 40 | according to the given |
| rsc | be7cbb4 | 2005-07-12 15:24:18 +0000 | [diff] [blame] | 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 |
| rsc | 3aec33f | 2005-07-18 22:41:58 +0000 | [diff] [blame] | 55 | .IR venti (3), |
| 56 | .IR venti (7) |
