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/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
*
* librsync -- the library for network deltas
* $Id$
*
* Copyright (C) 1999, 2000, 2001 by Martin Pool <mbp@samba.org>
* Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
*
* 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.
*/
/*
* readsums.c -- Load signatures from a file into an ::rs_signature_t.
*/
#include <config_rsync.h>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "rsync.h"
#include "sumset.h"
#include "job.h"
#include "trace.h"
#include "netint.h"
#include "protocol.h"
#include "util.h"
#include "stream.h"
static rs_result rs_loadsig_s_weak(rs_job_t *job);
static rs_result rs_loadsig_s_strong(rs_job_t *job);
/**
* Add a just-read-in checksum pair to the signature block.
*/
static rs_result rs_loadsig_add_sum(rs_job_t *job, rs_strong_sum_t *strong)
{
size_t new_size;
rs_signature_t *sig = job->signature;
rs_block_sig_t *asignature;
sig->count++;
new_size = sig->count * sizeof(rs_block_sig_t);
sig->block_sigs = realloc(sig->block_sigs, new_size);
if (sig->block_sigs == NULL) {
return RS_MEM_ERROR;
}
asignature = &(sig->block_sigs[sig->count - 1]);
asignature->weak_sum = job->weak_sig;
asignature->i = sig->count;
memcpy(asignature->strong_sum, strong, sig->strong_sum_len);
if (rs_trace_enabled()) {
char hexbuf[RS_MD4_LENGTH * 2 + 2];
rs_hexify(hexbuf, strong, sig->strong_sum_len);
rs_trace("read in checksum: weak=%#x, strong=%s", asignature->weak_sum,
hexbuf);
}
job->stats.sig_blocks++;
return RS_RUNNING;
}
static rs_result rs_loadsig_s_weak(rs_job_t *job)
{
int l;
rs_result result;
result = rs_suck_n4(job, &l);
if (result == RS_DONE)
;
else if (result == RS_INPUT_ENDED) /* ending here is OK */
return RS_DONE;
else
return result;
job->weak_sig = l;
job->statefn = rs_loadsig_s_strong;
return RS_RUNNING;
}
static rs_result rs_loadsig_s_strong(rs_job_t *job)
{
rs_result result;
rs_strong_sum_t *strongsum;
result = rs_scoop_read(job, job->signature->strong_sum_len,
(void **) &strongsum);
if (result != RS_DONE) return result;
job->statefn = rs_loadsig_s_weak;
return rs_loadsig_add_sum(job, strongsum);
}
static rs_result rs_loadsig_s_stronglen(rs_job_t *job)
{
int l;
rs_result result;
if ((result = rs_suck_n4(job, &l)) != RS_DONE)
return result;
job->strong_sum_len = l;
if (l < 0 || l > RS_MD4_LENGTH) {
rs_error("strong sum length %d is implausible", l);
return RS_CORRUPT;
}
job->signature->block_len = job->block_len;
job->signature->strong_sum_len = job->strong_sum_len;
rs_trace("allocated sigset_t (strong_sum_len=%d, block_len=%d)",
(int) job->strong_sum_len, (int) job->block_len);
job->statefn = rs_loadsig_s_weak;
return RS_RUNNING;
}
static rs_result rs_loadsig_s_blocklen(rs_job_t *job)
{
int l;
rs_result result;
if ((result = rs_suck_n4(job, &l)) != RS_DONE)
return result;
job->block_len = l;
if (job->block_len < 1) {
rs_error("block length of %d is bogus", (int) job->block_len);
return RS_CORRUPT;
}
job->statefn = rs_loadsig_s_stronglen;
job->stats.block_len = job->block_len;
return RS_RUNNING;
}
static rs_result rs_loadsig_s_magic(rs_job_t *job)
{
int l;
rs_result result;
if ((result = rs_suck_n4(job, &l)) != RS_DONE) {
return result;
} else if (l != RS_SIG_MAGIC) {
rs_error("wrong magic number %#10x for signature", l);
return RS_BAD_MAGIC;
} else {
rs_trace("got signature magic %#10x", l);
}
job->statefn = rs_loadsig_s_blocklen;
return RS_RUNNING;
}
/**
* \brief Read a signature from a file into an ::rs_signature_t structure
* in memory.
*
* Once there, it can be used to generate a delta to a newer version of
* the file.
*
* \note After loading the signatures, you must call
* rs_build_hash_table() before you can use them.
*/
rs_job_t *rs_loadsig_begin(rs_signature_t **signature)
{
rs_job_t *job;
job = rs_job_new("loadsig", rs_loadsig_s_magic);
*signature = job->signature = rs_alloc_struct(rs_signature_t);
job->signature->count = 0;
return job;
}
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