зеркало из https://github.com/microsoft/git.git
480 строки
11 KiB
C
480 строки
11 KiB
C
/*
|
|
* LibXDiff by Davide Libenzi ( File Differential Library )
|
|
* Copyright (C) 2003 Davide Libenzi
|
|
*
|
|
* This library 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 library 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 library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Davide Libenzi <davidel@xmailserver.org>
|
|
*
|
|
*/
|
|
|
|
#include "xinclude.h"
|
|
|
|
|
|
#define XDL_KPDIS_RUN 4
|
|
#define XDL_MAX_EQLIMIT 1024
|
|
#define XDL_SIMSCAN_WINDOW 100
|
|
|
|
|
|
typedef struct s_xdlclass {
|
|
struct s_xdlclass *next;
|
|
unsigned long ha;
|
|
char const *line;
|
|
long size;
|
|
long idx;
|
|
} xdlclass_t;
|
|
|
|
typedef struct s_xdlclassifier {
|
|
unsigned int hbits;
|
|
long hsize;
|
|
xdlclass_t **rchash;
|
|
chastore_t ncha;
|
|
long count;
|
|
long flags;
|
|
} xdlclassifier_t;
|
|
|
|
|
|
|
|
|
|
static int xdl_init_classifier(xdlclassifier_t *cf, long size, long flags);
|
|
static void xdl_free_classifier(xdlclassifier_t *cf);
|
|
static int xdl_classify_record(xdlclassifier_t *cf, xrecord_t **rhash, unsigned int hbits,
|
|
xrecord_t *rec);
|
|
static int xdl_prepare_ctx(mmfile_t *mf, long narec, xpparam_t const *xpp,
|
|
xdlclassifier_t *cf, xdfile_t *xdf);
|
|
static void xdl_free_ctx(xdfile_t *xdf);
|
|
static int xdl_clean_mmatch(char const *dis, long i, long s, long e);
|
|
static int xdl_cleanup_records(xdfile_t *xdf1, xdfile_t *xdf2);
|
|
static int xdl_trim_ends(xdfile_t *xdf1, xdfile_t *xdf2);
|
|
static int xdl_optimize_ctxs(xdfile_t *xdf1, xdfile_t *xdf2);
|
|
|
|
|
|
|
|
|
|
static int xdl_init_classifier(xdlclassifier_t *cf, long size, long flags) {
|
|
long i;
|
|
|
|
cf->flags = flags;
|
|
|
|
cf->hbits = xdl_hashbits((unsigned int) size);
|
|
cf->hsize = 1 << cf->hbits;
|
|
|
|
if (xdl_cha_init(&cf->ncha, sizeof(xdlclass_t), size / 4 + 1) < 0) {
|
|
|
|
return -1;
|
|
}
|
|
if (!(cf->rchash = (xdlclass_t **) xdl_malloc(cf->hsize * sizeof(xdlclass_t *)))) {
|
|
|
|
xdl_cha_free(&cf->ncha);
|
|
return -1;
|
|
}
|
|
for (i = 0; i < cf->hsize; i++)
|
|
cf->rchash[i] = NULL;
|
|
|
|
cf->count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void xdl_free_classifier(xdlclassifier_t *cf) {
|
|
|
|
xdl_free(cf->rchash);
|
|
xdl_cha_free(&cf->ncha);
|
|
}
|
|
|
|
|
|
static int xdl_classify_record(xdlclassifier_t *cf, xrecord_t **rhash, unsigned int hbits,
|
|
xrecord_t *rec) {
|
|
long hi;
|
|
char const *line;
|
|
xdlclass_t *rcrec;
|
|
|
|
line = rec->ptr;
|
|
hi = (long) XDL_HASHLONG(rec->ha, cf->hbits);
|
|
for (rcrec = cf->rchash[hi]; rcrec; rcrec = rcrec->next)
|
|
if (rcrec->ha == rec->ha &&
|
|
xdl_recmatch(rcrec->line, rcrec->size,
|
|
rec->ptr, rec->size, cf->flags))
|
|
break;
|
|
|
|
if (!rcrec) {
|
|
if (!(rcrec = xdl_cha_alloc(&cf->ncha))) {
|
|
|
|
return -1;
|
|
}
|
|
rcrec->idx = cf->count++;
|
|
rcrec->line = line;
|
|
rcrec->size = rec->size;
|
|
rcrec->ha = rec->ha;
|
|
rcrec->next = cf->rchash[hi];
|
|
cf->rchash[hi] = rcrec;
|
|
}
|
|
|
|
rec->ha = (unsigned long) rcrec->idx;
|
|
|
|
hi = (long) XDL_HASHLONG(rec->ha, hbits);
|
|
rec->next = rhash[hi];
|
|
rhash[hi] = rec;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int xdl_prepare_ctx(mmfile_t *mf, long narec, xpparam_t const *xpp,
|
|
xdlclassifier_t *cf, xdfile_t *xdf) {
|
|
unsigned int hbits;
|
|
long i, nrec, hsize, bsize;
|
|
unsigned long hav;
|
|
char const *blk, *cur, *top, *prev;
|
|
xrecord_t *crec;
|
|
xrecord_t **recs, **rrecs;
|
|
xrecord_t **rhash;
|
|
unsigned long *ha;
|
|
char *rchg;
|
|
long *rindex;
|
|
|
|
if (xdl_cha_init(&xdf->rcha, sizeof(xrecord_t), narec / 4 + 1) < 0) {
|
|
|
|
return -1;
|
|
}
|
|
if (!(recs = (xrecord_t **) xdl_malloc(narec * sizeof(xrecord_t *)))) {
|
|
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
|
|
hbits = xdl_hashbits((unsigned int) narec);
|
|
hsize = 1 << hbits;
|
|
if (!(rhash = (xrecord_t **) xdl_malloc(hsize * sizeof(xrecord_t *)))) {
|
|
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
for (i = 0; i < hsize; i++)
|
|
rhash[i] = NULL;
|
|
|
|
nrec = 0;
|
|
if ((cur = blk = xdl_mmfile_first(mf, &bsize)) != NULL) {
|
|
for (top = blk + bsize;;) {
|
|
if (cur >= top) {
|
|
if (!(cur = blk = xdl_mmfile_next(mf, &bsize)))
|
|
break;
|
|
top = blk + bsize;
|
|
}
|
|
prev = cur;
|
|
hav = xdl_hash_record(&cur, top, xpp->flags);
|
|
if (nrec >= narec) {
|
|
narec *= 2;
|
|
if (!(rrecs = (xrecord_t **) xdl_realloc(recs, narec * sizeof(xrecord_t *)))) {
|
|
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
recs = rrecs;
|
|
}
|
|
if (!(crec = xdl_cha_alloc(&xdf->rcha))) {
|
|
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
crec->ptr = prev;
|
|
crec->size = (long) (cur - prev);
|
|
crec->ha = hav;
|
|
recs[nrec++] = crec;
|
|
|
|
if (xdl_classify_record(cf, rhash, hbits, crec) < 0) {
|
|
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!(rchg = (char *) xdl_malloc((nrec + 2) * sizeof(char)))) {
|
|
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
memset(rchg, 0, (nrec + 2) * sizeof(char));
|
|
|
|
if (!(rindex = (long *) xdl_malloc((nrec + 1) * sizeof(long)))) {
|
|
|
|
xdl_free(rchg);
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
if (!(ha = (unsigned long *) xdl_malloc((nrec + 1) * sizeof(unsigned long)))) {
|
|
|
|
xdl_free(rindex);
|
|
xdl_free(rchg);
|
|
xdl_free(rhash);
|
|
xdl_free(recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
return -1;
|
|
}
|
|
|
|
xdf->nrec = nrec;
|
|
xdf->recs = recs;
|
|
xdf->hbits = hbits;
|
|
xdf->rhash = rhash;
|
|
xdf->rchg = rchg + 1;
|
|
xdf->rindex = rindex;
|
|
xdf->nreff = 0;
|
|
xdf->ha = ha;
|
|
xdf->dstart = 0;
|
|
xdf->dend = nrec - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void xdl_free_ctx(xdfile_t *xdf) {
|
|
|
|
xdl_free(xdf->rhash);
|
|
xdl_free(xdf->rindex);
|
|
xdl_free(xdf->rchg - 1);
|
|
xdl_free(xdf->ha);
|
|
xdl_free(xdf->recs);
|
|
xdl_cha_free(&xdf->rcha);
|
|
}
|
|
|
|
|
|
int xdl_prepare_env(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
|
|
xdfenv_t *xe) {
|
|
long enl1, enl2;
|
|
xdlclassifier_t cf;
|
|
|
|
enl1 = xdl_guess_lines(mf1) + 1;
|
|
enl2 = xdl_guess_lines(mf2) + 1;
|
|
|
|
if (xdl_init_classifier(&cf, enl1 + enl2 + 1, xpp->flags) < 0) {
|
|
|
|
return -1;
|
|
}
|
|
|
|
if (xdl_prepare_ctx(mf1, enl1, xpp, &cf, &xe->xdf1) < 0) {
|
|
|
|
xdl_free_classifier(&cf);
|
|
return -1;
|
|
}
|
|
if (xdl_prepare_ctx(mf2, enl2, xpp, &cf, &xe->xdf2) < 0) {
|
|
|
|
xdl_free_ctx(&xe->xdf1);
|
|
xdl_free_classifier(&cf);
|
|
return -1;
|
|
}
|
|
|
|
xdl_free_classifier(&cf);
|
|
|
|
if (xdl_optimize_ctxs(&xe->xdf1, &xe->xdf2) < 0) {
|
|
|
|
xdl_free_ctx(&xe->xdf2);
|
|
xdl_free_ctx(&xe->xdf1);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void xdl_free_env(xdfenv_t *xe) {
|
|
|
|
xdl_free_ctx(&xe->xdf2);
|
|
xdl_free_ctx(&xe->xdf1);
|
|
}
|
|
|
|
|
|
static int xdl_clean_mmatch(char const *dis, long i, long s, long e) {
|
|
long r, rdis0, rpdis0, rdis1, rpdis1;
|
|
|
|
/*
|
|
* Limits the window the is examined during the similar-lines
|
|
* scan. The loops below stops when dis[i - r] == 1 (line that
|
|
* has no match), but there are corner cases where the loop
|
|
* proceed all the way to the extremities by causing huge
|
|
* performance penalties in case of big files.
|
|
*/
|
|
if (i - s > XDL_SIMSCAN_WINDOW)
|
|
s = i - XDL_SIMSCAN_WINDOW;
|
|
if (e - i > XDL_SIMSCAN_WINDOW)
|
|
e = i + XDL_SIMSCAN_WINDOW;
|
|
|
|
/*
|
|
* Scans the lines before 'i' to find a run of lines that either
|
|
* have no match (dis[j] == 0) or have multiple matches (dis[j] > 1).
|
|
* Note that we always call this function with dis[i] > 1, so the
|
|
* current line (i) is already a multimatch line.
|
|
*/
|
|
for (r = 1, rdis0 = 0, rpdis0 = 1; (i - r) >= s; r++) {
|
|
if (!dis[i - r])
|
|
rdis0++;
|
|
else if (dis[i - r] == 2)
|
|
rpdis0++;
|
|
else
|
|
break;
|
|
}
|
|
/*
|
|
* If the run before the line 'i' found only multimatch lines, we
|
|
* return 0 and hence we don't make the current line (i) discarded.
|
|
* We want to discard multimatch lines only when they appear in the
|
|
* middle of runs with nomatch lines (dis[j] == 0).
|
|
*/
|
|
if (rdis0 == 0)
|
|
return 0;
|
|
for (r = 1, rdis1 = 0, rpdis1 = 1; (i + r) <= e; r++) {
|
|
if (!dis[i + r])
|
|
rdis1++;
|
|
else if (dis[i + r] == 2)
|
|
rpdis1++;
|
|
else
|
|
break;
|
|
}
|
|
/*
|
|
* If the run after the line 'i' found only multimatch lines, we
|
|
* return 0 and hence we don't make the current line (i) discarded.
|
|
*/
|
|
if (rdis1 == 0)
|
|
return 0;
|
|
rdis1 += rdis0;
|
|
rpdis1 += rpdis0;
|
|
|
|
return rpdis1 * XDL_KPDIS_RUN < (rpdis1 + rdis1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Try to reduce the problem complexity, discard records that have no
|
|
* matches on the other file. Also, lines that have multiple matches
|
|
* might be potentially discarded if they happear in a run of discardable.
|
|
*/
|
|
static int xdl_cleanup_records(xdfile_t *xdf1, xdfile_t *xdf2) {
|
|
long i, nm, rhi, nreff, mlim;
|
|
unsigned long hav;
|
|
xrecord_t **recs;
|
|
xrecord_t *rec;
|
|
char *dis, *dis1, *dis2;
|
|
|
|
if (!(dis = (char *) xdl_malloc(xdf1->nrec + xdf2->nrec + 2))) {
|
|
|
|
return -1;
|
|
}
|
|
memset(dis, 0, xdf1->nrec + xdf2->nrec + 2);
|
|
dis1 = dis;
|
|
dis2 = dis1 + xdf1->nrec + 1;
|
|
|
|
if ((mlim = xdl_bogosqrt(xdf1->nrec)) > XDL_MAX_EQLIMIT)
|
|
mlim = XDL_MAX_EQLIMIT;
|
|
for (i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart]; i <= xdf1->dend; i++, recs++) {
|
|
hav = (*recs)->ha;
|
|
rhi = (long) XDL_HASHLONG(hav, xdf2->hbits);
|
|
for (nm = 0, rec = xdf2->rhash[rhi]; rec; rec = rec->next)
|
|
if (rec->ha == hav && ++nm == mlim)
|
|
break;
|
|
dis1[i] = (nm == 0) ? 0: (nm >= mlim) ? 2: 1;
|
|
}
|
|
|
|
if ((mlim = xdl_bogosqrt(xdf2->nrec)) > XDL_MAX_EQLIMIT)
|
|
mlim = XDL_MAX_EQLIMIT;
|
|
for (i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart]; i <= xdf2->dend; i++, recs++) {
|
|
hav = (*recs)->ha;
|
|
rhi = (long) XDL_HASHLONG(hav, xdf1->hbits);
|
|
for (nm = 0, rec = xdf1->rhash[rhi]; rec; rec = rec->next)
|
|
if (rec->ha == hav && ++nm == mlim)
|
|
break;
|
|
dis2[i] = (nm == 0) ? 0: (nm >= mlim) ? 2: 1;
|
|
}
|
|
|
|
for (nreff = 0, i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart];
|
|
i <= xdf1->dend; i++, recs++) {
|
|
if (dis1[i] == 1 ||
|
|
(dis1[i] == 2 && !xdl_clean_mmatch(dis1, i, xdf1->dstart, xdf1->dend))) {
|
|
xdf1->rindex[nreff] = i;
|
|
xdf1->ha[nreff] = (*recs)->ha;
|
|
nreff++;
|
|
} else
|
|
xdf1->rchg[i] = 1;
|
|
}
|
|
xdf1->nreff = nreff;
|
|
|
|
for (nreff = 0, i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart];
|
|
i <= xdf2->dend; i++, recs++) {
|
|
if (dis2[i] == 1 ||
|
|
(dis2[i] == 2 && !xdl_clean_mmatch(dis2, i, xdf2->dstart, xdf2->dend))) {
|
|
xdf2->rindex[nreff] = i;
|
|
xdf2->ha[nreff] = (*recs)->ha;
|
|
nreff++;
|
|
} else
|
|
xdf2->rchg[i] = 1;
|
|
}
|
|
xdf2->nreff = nreff;
|
|
|
|
xdl_free(dis);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Early trim initial and terminal matching records.
|
|
*/
|
|
static int xdl_trim_ends(xdfile_t *xdf1, xdfile_t *xdf2) {
|
|
long i, lim;
|
|
xrecord_t **recs1, **recs2;
|
|
|
|
recs1 = xdf1->recs;
|
|
recs2 = xdf2->recs;
|
|
for (i = 0, lim = XDL_MIN(xdf1->nrec, xdf2->nrec); i < lim;
|
|
i++, recs1++, recs2++)
|
|
if ((*recs1)->ha != (*recs2)->ha)
|
|
break;
|
|
|
|
xdf1->dstart = xdf2->dstart = i;
|
|
|
|
recs1 = xdf1->recs + xdf1->nrec - 1;
|
|
recs2 = xdf2->recs + xdf2->nrec - 1;
|
|
for (lim -= i, i = 0; i < lim; i++, recs1--, recs2--)
|
|
if ((*recs1)->ha != (*recs2)->ha)
|
|
break;
|
|
|
|
xdf1->dend = xdf1->nrec - i - 1;
|
|
xdf2->dend = xdf2->nrec - i - 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int xdl_optimize_ctxs(xdfile_t *xdf1, xdfile_t *xdf2) {
|
|
|
|
if (xdl_trim_ends(xdf1, xdf2) < 0 ||
|
|
xdl_cleanup_records(xdf1, xdf2) < 0) {
|
|
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|