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/types.h>
28 #include <err.h>
29 #include <inttypes.h>
30 #include <md5.h>
31 #include <pthread.h>
32 #include <stdlib.h>
33 #include <strings.h>
34
35 #if defined(MKUZ_DEBUG)
36 # include <stdio.h>
37 #endif
38
39 #include "mkuz_conveyor.h"
40 #include "mkuz_cfg.h"
41 #include "mkuzip.h"
42 #include "mkuz_blk.h"
43 #include "mkuz_format.h"
44 #include "mkuz_fqueue.h"
45 #include "mkuz_blk_chain.h"
46
47 static void compute_digest(struct mkuz_blk *);
48
49 struct cw_args {
50 struct mkuz_conveyor *cvp;
51 struct mkuz_cfg *cfp;
52 };
53
54 static void *
cworker(void * p)55 cworker(void *p)
56 {
57 struct cw_args *cwp;
58 struct mkuz_cfg *cfp;
59 struct mkuz_blk *oblk, *iblk;
60 struct mkuz_conveyor *cvp;
61 void *c_ctx;
62
63 cwp = (struct cw_args *)p;
64 cfp = cwp->cfp;
65 cvp = cwp->cvp;
66 free(cwp);
67 c_ctx = cfp->handler->f_init(&cfp->comp_level);
68 for (;;) {
69 iblk = mkuz_fqueue_deq(cvp->wrk_queue);
70 if (iblk == MKUZ_BLK_EOF) {
71 /* Let other threads to see the EOF block */
72 mkuz_fqueue_enq(cvp->wrk_queue, iblk);
73 break;
74 }
75 if (cfp->no_zcomp == 0 &&
76 mkuz_memvcmp(iblk->data, '\0', iblk->info.len) != 0) {
77 /* All zeroes block */
78 oblk = mkuz_blk_ctor(0);
79 } else {
80 oblk = mkuz_blk_ctor(cfp->cbound_blksz);
81 cfp->handler->f_compress(c_ctx, iblk, oblk);
82 if (cfp->en_dedup != 0) {
83 compute_digest(oblk);
84 }
85 }
86 oblk->info.blkno = iblk->info.blkno;
87 mkuz_fqueue_enq(cvp->results, oblk);
88 free(iblk);
89 }
90 return (NULL);
91 }
92
93 static void
compute_digest(struct mkuz_blk * bp)94 compute_digest(struct mkuz_blk *bp)
95 {
96 MD5_CTX mcontext;
97
98 MD5Init(&mcontext);
99 MD5Update(&mcontext, bp->data, bp->info.len);
100 MD5Final(bp->info.digest, &mcontext);
101 }
102
103 struct mkuz_conveyor *
mkuz_conveyor_ctor(struct mkuz_cfg * cfp)104 mkuz_conveyor_ctor(struct mkuz_cfg *cfp)
105 {
106 struct mkuz_conveyor *cp;
107 struct cw_args *cwp;
108 int i, r;
109
110 cp = mkuz_safe_zmalloc(sizeof(struct mkuz_conveyor) +
111 (sizeof(pthread_t) * cfp->nworkers));
112
113 cp->wrk_queue = mkuz_fqueue_ctor(1);
114 cp->results = mkuz_fqueue_ctor(1);
115
116 for (i = 0; i < cfp->nworkers; i++) {
117 cwp = mkuz_safe_zmalloc(sizeof(struct cw_args));
118 cwp->cfp = cfp;
119 cwp->cvp = cp;
120 r = pthread_create(&cp->wthreads[i], NULL, cworker, (void *)cwp);
121 if (r != 0) {
122 errx(1, "mkuz_conveyor_ctor: pthread_create() failed");
123 /* Not reached */
124 }
125 }
126 return (cp);
127 }
128