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/* -*- 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;
}
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