1d386b48a5
Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/
147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*
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* Copyright (c) 2016 Maxim Sobolev <sobomax@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if defined(MKUZ_DEBUG)
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# include <assert.h>
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# include <stdio.h>
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#endif
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#include "mkuz_blockcache.h"
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#include "mkuz_blk.h"
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struct mkuz_blkcache_itm {
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struct mkuz_blk_info hit;
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struct mkuz_blkcache_itm *next;
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};
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static struct mkuz_blkcache {
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struct mkuz_blkcache_itm first[256];
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} blkcache;
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static int
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verify_match(int fd, const struct mkuz_blk *cbp, struct mkuz_blkcache_itm *bcep)
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{
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void *vbuf;
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ssize_t rlen;
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int rval;
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rval = -1;
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vbuf = malloc(cbp->info.len);
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if (vbuf == NULL) {
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goto e0;
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}
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if (lseek(fd, bcep->hit.offset, SEEK_SET) < 0) {
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goto e1;
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}
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rlen = read(fd, vbuf, cbp->info.len);
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if (rlen < 0 || (unsigned)rlen != cbp->info.len) {
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goto e2;
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}
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rval = (memcmp(cbp->data, vbuf, cbp->info.len) == 0) ? 1 : 0;
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e2:
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lseek(fd, cbp->info.offset, SEEK_SET);
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e1:
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free(vbuf);
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e0:
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return (rval);
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}
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#define I2J(x) ((intmax_t)(x))
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#define U2J(x) ((uintmax_t)(x))
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static unsigned char
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digest_fold(const unsigned char *mdigest)
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{
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int i;
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unsigned char rval;
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rval = mdigest[0];
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for (i = 1; i < 16; i++) {
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rval = rval ^ mdigest[i];
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}
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return (rval);
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}
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struct mkuz_blk_info *
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mkuz_blkcache_regblock(int fd, const struct mkuz_blk *bp)
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{
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struct mkuz_blkcache_itm *bcep;
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int rval;
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unsigned char h;
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#if defined(MKUZ_DEBUG)
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assert((unsigned)lseek(fd, 0, SEEK_CUR) == bp->info.offset);
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#endif
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h = digest_fold(bp->info.digest);
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if (blkcache.first[h].hit.len == 0) {
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bcep = &blkcache.first[h];
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} else {
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for (bcep = &blkcache.first[h]; bcep != NULL; bcep = bcep->next) {
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if (bcep->hit.len != bp->info.len)
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continue;
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if (memcmp(bp->info.digest, bcep->hit.digest,
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sizeof(bp->info.digest)) == 0) {
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break;
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}
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}
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if (bcep != NULL) {
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rval = verify_match(fd, bp, bcep);
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if (rval == 1) {
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#if defined(MKUZ_DEBUG)
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fprintf(stderr, "cache hit %jd, %jd, %jd, %jd\n",
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I2J(bcep->hit.blkno), I2J(bcep->hit.offset),
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I2J(bp->info.offset), I2J(bp->info.len));
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#endif
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return (&bcep->hit);
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}
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if (rval == 0) {
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#if defined(MKUZ_DEBUG)
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fprintf(stderr, "block MD5 collision, you should try lottery, "
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"man!\n");
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#endif
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return (NULL);
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}
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warn("verify_match");
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return (NULL);
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}
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bcep = malloc(sizeof(struct mkuz_blkcache_itm));
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if (bcep == NULL)
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return (NULL);
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memset(bcep, '\0', sizeof(struct mkuz_blkcache_itm));
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bcep->next = blkcache.first[h].next;
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blkcache.first[h].next = bcep;
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}
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bcep->hit = bp->info;
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return (NULL);
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}
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