File: hsnad.c

package info (click to toggle)
libhsync 0.5.7-1.2
  • links: PTS
  • area: main
  • in suites: woody
  • size: 1,060 kB
  • ctags: 543
  • sloc: sh: 7,944; ansic: 5,413; makefile: 154
file content (124 lines) | stat: -rw-r--r-- 3,031 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
/*				       	-*- c-file-style: "bsd" -*-
 * rproxy -- dynamic caching and delta update in HTTP
 * $Id: hsnad.c,v 1.9 2000/08/06 12:50:36 mbp Exp $
 * 
 * Copyright (C) 1999, 2000 by Martin Pool <mbp@humbug.org.au>
 * Copyright (C) 1999 by Andrew Tridgell
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * TODO: Is anyone interested in having a way to write out the
 * signatures as they're generated?  We'd have to make hsnad also
 * generate an in-memory sumset, I imagine... or perhaps if we had
 * pluggable output callbacks, then we could put a tee into the
 * signature output routine.
 */

#include "includes.h"


#include <unistd.h>
#include <stdio.h>
#include <sys/file.h>
#include <string.h>

int             show_stats = 0;

static void
usage(char const *progname)
{
    fprintf(stderr,
	    "Usage: %s OLDSIG [OPTIONS]\n"
	    "\n"
	    "Computes difference/signature of stdin and "
	    "writes it to stdout."
	    "\n"
	    "Options:\n"
	    "  -D           show debugging trace if compiled in\n"
	    "  -S           show statistics\n"
	    "  -h           show help\n", progname);
}


static void
process_opts(int argc, char **argv)
{
    int             c;

    while ((c = getopt(argc, argv, "DS")) != -1) {
	switch (c) {
	case '?':
	case ':':
	    usage(argv[0]);
	    exit(1);

	case 'h':
	    usage(argv[0]);
	    exit(0);

        case 'D':
	    if (!hs_supports_trace()) {
		_hs_error("library does not support trace");
	    }
	    hs_trace_set_level(LOG_DEBUG);
	    break;

        case 'S':
	    show_stats = 1;
	    break;
	}
    }
}


int
main(int argc, char **argv)
{
    hs_encode_job_t *job;
    hs_filebuf_t   *out;
    hs_result_t     result;
    hs_stats_t      stats;
    hs_filebuf_t   *sig_fb;
    hs_sumset_t    *sums = NULL;

    process_opts(argc, argv);

    out = hs_filebuf_from_fd(STDOUT_FILENO);
    if (!out) {
	_hs_fatal("couldn't create a filebuf on stdout");
	return 1;
    }

    if (optind < argc) {
	sig_fb = hs_filebuf_open(argv[optind], O_RDONLY);
	sums = hs_read_sumset(hs_filebuf_read, sig_fb);
    }

    job = hs_encode_begin(STDIN_FILENO, hs_filebuf_write, out,
			  sums, &stats, 1024);
    do {
	result = hs_encode_iter(job);
    } while (result == HS_AGAIN);

    if (sums)
	hs_free_sumset(sums);

    if (show_stats)
	hs_log_stats(&stats);

    return result == HS_DONE ? 0 : 2;
}