1/*
2 * Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/types.h>
31#include <err.h>
32#include <inttypes.h>
33#include <md5.h>
34#include <pthread.h>
35#include <stdlib.h>
36#include <strings.h>
37
38#if defined(MKUZ_DEBUG)
39# include <stdio.h>
40#endif
41
42#include "mkuz_conveyor.h"
43#include "mkuz_cfg.h"
44#include "mkuzip.h"
45#include "mkuz_format.h"
46#include "mkuz_blk.h"
47#include "mkuz_fqueue.h"
48#include "mkuz_blk_chain.h"
49
50static void compute_digest(struct mkuz_blk *);
51
52struct cw_args {
53    struct mkuz_conveyor *cvp;
54    struct mkuz_cfg *cfp;
55};
56
57static void *
58cworker(void *p)
59{
60    struct cw_args *cwp;
61    struct mkuz_cfg *cfp;
62    struct mkuz_blk *oblk, *iblk;
63    struct mkuz_conveyor *cvp;
64    void *c_ctx;
65
66    cwp = (struct cw_args *)p;
67    cfp = cwp->cfp;
68    cvp = cwp->cvp;
69    free(cwp);
70    c_ctx = cfp->handler->f_init(cfp->blksz);
71    for (;;) {
72        iblk = mkuz_fqueue_deq(cvp->wrk_queue);
73        if (iblk == MKUZ_BLK_EOF) {
74            /* Let other threads to see the EOF block */
75            mkuz_fqueue_enq(cvp->wrk_queue, iblk);
76            break;
77        }
78        if (cfp->no_zcomp == 0 &&
79          mkuz_memvcmp(iblk->data, '\0', iblk->info.len) != 0) {
80            /* All zeroes block */
81            oblk = mkuz_blk_ctor(0);
82        } else {
83            oblk = cfp->handler->f_compress(c_ctx, iblk);
84            if (cfp->en_dedup != 0) {
85                compute_digest(oblk);
86            }
87        }
88        oblk->info.blkno = iblk->info.blkno;
89        mkuz_fqueue_enq(cvp->results, oblk);
90        free(iblk);
91    }
92    return (NULL);
93}
94
95static void
96compute_digest(struct mkuz_blk *bp)
97{
98    MD5_CTX mcontext;
99
100    MD5Init(&mcontext);
101    MD5Update(&mcontext, bp->data, bp->info.len);
102    MD5Final(bp->info.digest, &mcontext);
103}
104
105struct mkuz_conveyor *
106mkuz_conveyor_ctor(struct mkuz_cfg *cfp)
107{
108    struct mkuz_conveyor *cp;
109    struct cw_args *cwp;
110    int i, r;
111
112    cp = mkuz_safe_zmalloc(sizeof(struct mkuz_conveyor) +
113      (sizeof(pthread_t) * cfp->nworkers));
114
115    cp->wrk_queue = mkuz_fqueue_ctor(1);
116    cp->results = mkuz_fqueue_ctor(1);
117
118    for (i = 0; i < cfp->nworkers; i++) {
119        cwp = mkuz_safe_zmalloc(sizeof(struct cw_args));
120        cwp->cfp = cfp;
121        cwp->cvp = cp;
122        r = pthread_create(&cp->wthreads[i], NULL, cworker, (void *)cwp);
123        if (r != 0) {
124            errx(1, "mkuz_conveyor_ctor: pthread_create() failed");
125            /* Not reached */
126        }
127    }
128    return (cp);
129}
130