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/* -*- c-file-style: "bsd" -*-
* rproxy -- dynamic caching and delta update in HTTP
* $Id: sumset.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.
*/
/* sumset -- Manipulate and do IO on sets of checksums. */
#include "includes.h"
#include "sum_p.h"
/*
* Read and remember all the signatures from last time. Return null *
* if there are no signatures.
*/
hs_sumset_t *
hs_read_sumset(hs_read_fn_t sigread_fn, void *sigread_priv)
{
int ret = 0;
int block_len;
hs_sum_buf_t *asignature;
int n = 0;
int checksum1;
hs_sumset_t *sumbuf;
uint32_t tmp32;
ret = _hs_check_sig_version(sigread_fn, sigread_priv);
if (ret <= 0)
return NULL;
if (_hs_read_blocksize(sigread_fn, sigread_priv, &block_len) < 0)
return NULL;
sumbuf = _hs_alloc_struct(hs_sumset_t);
sumbuf->block_len = block_len;
sumbuf->block_sums = NULL;
/* XXX: It's perhaps a bit inefficient to realloc each time. We could
prealloc, but for now we'll give realloc the benefit of the doubt. */
while (1) {
ret = _hs_read_netint(sigread_fn, sigread_priv, &tmp32);
checksum1 = tmp32;
if (ret == 0)
break;
if (ret < 0) {
_hs_error("IO error while reading in signatures");
goto fail;
}
assert(ret == 4);
sumbuf->block_sums = realloc(sumbuf->block_sums, (n + 1) * sizeof(hs_sum_buf_t));
if (sumbuf->block_sums == NULL) {
errno = ENOMEM;
ret = -1;
break;
}
asignature = &(sumbuf->block_sums[n]);
asignature->weak_sum = checksum1;
asignature->i = ++n;
/* read in the long sum */
ret = _hs_must_read(sigread_fn, sigread_priv,
asignature->strong_sum, DEFAULT_SUM_LENGTH);
if (ret != DEFAULT_SUM_LENGTH) {
_hs_error("IO error while reading strong signature %d", n);
break;
}
}
if (ret < 0) {
_hs_error("error reading checksums");
goto fail;
}
sumbuf->count = n;
_hs_trace("Read %d sigs", n);
if (_hs_build_hash_table(sumbuf) < 0) {
_hs_error("error building checksum hashtable");
goto fail;
}
return sumbuf;
fail:
if (sumbuf)
free(sumbuf);
return NULL;
}
void
hs_free_sumset(hs_sumset_t * psums)
{
if (psums->block_sums)
free(psums->block_sums);
assert(psums->tag_table);
free(psums->tag_table);
if (psums->targets)
free(psums->targets);
hs_bzero(psums, sizeof *psums);
free(psums);
}
void
hs_sumset_dump(hs_sumset_t const *sums)
{
int i;
char strong_hex[MD4_LENGTH * 3];
_hs_log(LOG_INFO,
"sumset info: block_len=%d, file length=%lu, "
"number of chunks=%d, remainder=%d",
sums->block_len,
(unsigned long) sums->flength, sums->count,
sums->remainder);
for (i = 0; i < sums->count; i++) {
hs_hexify_buf(strong_hex, sums->block_sums[i].strong_sum,
DEFAULT_SUM_LENGTH);
_hs_log(LOG_INFO,
"sum %6d: weak=%08x, strong=%s",
i, sums->block_sums[i].weak_sum, strong_hex);
}
}
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