mercurial/bdiff.c
author mpm@selenic.com
Tue, 28 Jun 2005 02:34:14 -0800
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child 510 7f3fc8fd427e
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/*
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 bdiff.c - efficient binary diff extension for Mercurial
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 Copyright 2005 Matt Mackall <mpm@selenic.com>
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 This software may be used and distributed according to the terms of
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 the GNU General Public License, incorporated herein by reference.
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 Based roughly on Python difflib
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*/
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#include <Python.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef _WIN32
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static uint32_t htonl(uint32_t x)
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{
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	return ((x & 0x000000ffUL) << 24) |
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		((x & 0x0000ff00UL) <<  8) |
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		((x & 0x00ff0000UL) >>  8) |
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		((x & 0xff000000UL) >> 24);
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}
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#else
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#include <netinet/in.h>
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#endif
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struct line {
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	int h, len, n, e;
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	const char *l;
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};
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struct pos {
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	int pos, len;
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};
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struct hunk {
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	int a1, a2, b1, b2;
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};
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struct hunklist {
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	struct hunk *base, *head;
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};
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static __inline uint32_t rol32(uint32_t word, unsigned int shift)
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{
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        return (word << shift) | (word >> (32 - shift));
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}
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int splitlines(const char *a, int len, struct line **lr)
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{
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	int h, i;
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	const char *p, *b = a;
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	struct line *l;
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	/* count the lines */
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	i = 1; /* extra line for sentinel */
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	for (p = a; p < a + len; p++)
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		if (*p == '\n' || p == a + len - 1)
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			i++;
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	*lr = l = malloc(sizeof(struct line) * i);
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	if (!l)
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		return -1;
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	/* build the line array and calculate hashes */
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	h = 0;
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	for (p = a; p < a + len; p++) {
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		h = *p + rol32(h, 7); /* a simple hash from GNU diff */
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		if (*p == '\n' || p == a + len - 1) {
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			l->len = p - b + 1;
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			l->h = h * l->len;
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			l->l = b;
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			l->n = -1;
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			l++;
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			b = p + 1;
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			h = 0;
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		}
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	}
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	/* set up a sentinel */
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	l->h = l->len = 0;
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	l->l = a + len;
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	return i - 1;
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}
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int inline cmp(struct line *a, struct line *b)
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{
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	return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len);
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}
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static int equatelines(struct line *a, int an, struct line *b, int bn)
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{
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	int i, j, buckets = 1, t;
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	struct pos *h;
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	/* build a hash table of the next highest power of 2 */
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	while (buckets < bn + 1)
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		buckets *= 2;
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	h = malloc(buckets * sizeof(struct pos));
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	buckets = buckets - 1;
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	if (!h)
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		return 0;
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	/* clear the hash table */
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	for (i = 0; i <= buckets; i++) {
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		h[i].pos = -1;
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		h[i].len = 0;
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	}
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	/* add lines to the hash table chains */
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	for (i = bn - 1; i >= 0; i--) {
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		/* find the equivalence class */
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		for (j = b[i].h & buckets; h[j].pos != -1;
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		     j = (j + 1) & buckets)
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			if (!cmp(b + i, b + h[j].pos))
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				break;
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		/* add to the head of the equivalence class */
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		b[i].n = h[j].pos;
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		b[i].e = j;
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		h[j].pos = i;
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		h[j].len++; /* keep track of popularity */
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	}
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	/* compute popularity threshold */
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	t = (bn >= 200) ? bn / 100 : bn + 1;
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	/* match items in a to their equivalence class in b */
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	for (i = 0; i < an; i++) {
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		/* find the equivalence class */
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		for (j = a[i].h & buckets; h[j].pos != -1;
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		     j = (j + 1) & buckets)
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			if (!cmp(a + i, b + h[j].pos))
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				break;
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		a[i].e = j; /* use equivalence class for quick compare */
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		if(h[j].len <= t)
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			a[i].n = h[j].pos; /* point to head of match list */
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		else
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			a[i].n = -1; /* too popular */
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	}
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	/* discard hash tables */
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	free(h);
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	return 1;
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}
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static int longest_match(struct line *a, struct line *b, struct pos *pos,
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			 int a1, int a2, int b1, int b2, int *omi, int *omj)
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{
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   152
	int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k;
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   153
8b067bde6679 Add a fast binary diff extension (not yet used)
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   154
	for (i = a1; i < a2; i++) {
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   155
		/* skip things before the current block */
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   156
		for (j = a[i].n; j != -1 && j < b1; j = b[j].n)
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diff changeset
   157
			;
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diff changeset
   158
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   159
		/* loop through all lines match a[i] in b */
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   160
		for (; j != -1 && j < b2; j = b[j].n) {
8b067bde6679 Add a fast binary diff extension (not yet used)
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   161
			/* does this extend an earlier match? */
474
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diff changeset
   162
			if (i > a1 && j > b1 && pos[j - 1].pos == i - 1)
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diff changeset
   163
				k = pos[j - 1].len + 1;
400
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   164
			else
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   165
				k = 1;
474
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   166
			pos[j].pos = i;
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diff changeset
   167
			pos[j].len = k;
400
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   168
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diff changeset
   169
			/* best match so far? */
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diff changeset
   170
			if (k > mk) {
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   171
				mi = i;
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   172
				mj = j;
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   173
				mk = k;
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   174
			}
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   175
		}
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   176
	}
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   177
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   178
	if (mk) {
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   179
		mi = mi - mk + 1;
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   180
		mj = mj - mk + 1;
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   181
	}
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   182
8b067bde6679 Add a fast binary diff extension (not yet used)
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   183
	/* expand match to include neighboring popular lines */
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   184
	while (mi - mb > a1 && mj - mb > b1 &&
433
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diff changeset
   185
	       a[mi - mb - 1].e == b[mj - mb - 1].e)
400
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   186
		mb++;
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   187
	while (mi + mk < a2 && mj + mk < b2 &&
433
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diff changeset
   188
	       a[mi + mk].e == b[mj + mk].e)
400
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   189
		mk++;
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   190
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diff changeset
   191
	*omi = mi - mb;
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parents:
diff changeset
   192
	*omj = mj - mb;
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   193
	return mk + mb;
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diff changeset
   194
}
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   195
474
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   196
static void recurse(struct line *a, struct line *b, struct pos *pos,
400
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   197
		    int a1, int a2, int b1, int b2, struct hunklist *l)
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   198
{
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diff changeset
   199
	int i, j, k;
8b067bde6679 Add a fast binary diff extension (not yet used)
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   200
8b067bde6679 Add a fast binary diff extension (not yet used)
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diff changeset
   201
	/* find the longest match in this chunk */
474
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diff changeset
   202
	k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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diff changeset
   203
	if (!k)
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   204
		return;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   205
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   206
	/* and recurse on the remaining chunks on either side */
474
b2ae8283d1a6 Minor speed improvements for bdiff
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parents: 472
diff changeset
   207
	recurse(a, b, pos, a1, i, b1, j, l);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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diff changeset
   208
	l->head->a1 = i;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   209
	l->head->a2 = i + k;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   210
	l->head->b1 = j;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   211
	l->head->b2 = j + k;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   212
	l->head++;
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
   213
	recurse(a, b, pos, i + k, a2, j + k, b2, l);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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diff changeset
   214
}
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   215
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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diff changeset
   216
static struct hunklist diff(struct line *a, int an, struct line *b, int bn)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   217
{
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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diff changeset
   218
	struct hunklist l;
474
b2ae8283d1a6 Minor speed improvements for bdiff
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parents: 472
diff changeset
   219
	struct pos *pos;
b2ae8283d1a6 Minor speed improvements for bdiff
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parents: 472
diff changeset
   220
	int t;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   221
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   222
	/* allocate and fill arrays */
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   223
	t = equatelines(a, an, b, bn);
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
   224
	pos = calloc(bn, sizeof(struct pos));
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   225
	l.head = l.base = malloc(sizeof(struct hunk) * ((an + bn) / 4 + 2));
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   226
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
   227
	if (pos && l.base && t) {
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   228
		/* generate the matching block list */
474
b2ae8283d1a6 Minor speed improvements for bdiff
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parents: 472
diff changeset
   229
		recurse(a, b, pos, 0, an, 0, bn, &l);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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diff changeset
   230
		l.head->a1 = an;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   231
		l.head->b1 = bn;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   232
		l.head++;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   233
	}
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   234
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
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diff changeset
   235
	free(pos);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   236
	return l;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   237
}
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   238
79c694462294 Add bdiff.blocks / minor performance tweaks
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diff changeset
   239
static PyObject *blocks(PyObject *self, PyObject *args)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   240
{
435
e731d25ddab2 Fix a compile warning for bdiff
mpm@selenic.com
parents: 433
diff changeset
   241
	PyObject *sa, *sb, *rl = NULL, *m;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   242
	struct line *a, *b;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   243
	struct hunklist l;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   244
	struct hunk *h;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   245
	int an, bn, pos = 0;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   246
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   247
	if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   248
		return NULL;
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   249
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   250
	an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   251
	bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   252
	if (!a || !b)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   253
		goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   254
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   255
	l = diff(a, an, b, bn);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   256
	rl = PyList_New(l.head - l.base);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   257
	if (!l.head || !rl)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   258
		goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   259
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   260
	for(h = l.base; h != l.head; h++) {
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   261
		m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   262
		PyList_SetItem(rl, pos, m);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   263
		pos++;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   264
	}
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   265
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   266
nomem:
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   267
	free(a);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   268
	free(b);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   269
	free(l.base);
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   270
	return rl ? rl : PyErr_NoMemory();
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   271
}
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   272
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   273
static PyObject *bdiff(PyObject *self, PyObject *args)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   274
{
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   275
	PyObject *sa, *sb, *result = NULL;
79c694462294 Add bdiff.blocks / minor performance tweaks
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parents: 411
diff changeset
   276
	struct line *al, *bl;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   277
	struct hunklist l;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   278
	struct hunk *h;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   279
	char encode[12], *rb;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   280
	int an, bn, len = 0, la = 0, lb = 0;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   281
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   282
	if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   283
		return NULL;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   284
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   285
	an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al);
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   286
	bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   287
	if (!al || !bl)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   288
		goto nomem;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   289
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   290
	l = diff(al, an, bl, bn);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   291
	if (!l.head)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
   292
		goto nomem;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   293
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   294
	/* calculate length of output */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   295
	for(h = l.base; h != l.head; h++) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   296
		if (h->a1 != la || h->b1 != lb)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   297
			len += 12 + bl[h->b1].l - bl[lb].l;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   298
		la = h->a2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   299
		lb = h->b2;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   300
	}
8b067bde6679 Add a fast binary diff extension (not yet used)
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parents:
diff changeset
   301
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   302
	result = PyString_FromStringAndSize(NULL, len);
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   303
	if (!result)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   304
		goto nomem;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
   305
8b067bde6679 Add a fast binary diff extension (not yet used)
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	/* build binary patch */
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	rb = PyString_AsString(result);
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	la = lb = 0;
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	for(h = l.base; h != l.head; h++) {
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		if (h->a1 != la || h->b1 != lb) {
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			len = bl[h->b1].l - bl[lb].l;
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			*(uint32_t *)(encode)     = htonl(al[la].l - al->l);
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			*(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l);
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			*(uint32_t *)(encode + 8) = htonl(len);
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			memcpy(rb, encode, 12);
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			memcpy(rb + 12, bl[lb].l, len);
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			rb += 12 + len;
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		}
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		la = h->a2;
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		lb = h->b2;
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	}
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nomem:
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	free(al);
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	free(bl);
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	free(l.base);
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	return result ? result : PyErr_NoMemory();
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}
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static char mdiff_doc[] = "Efficient binary diff.";
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static PyMethodDef methods[] = {
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	{"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"},
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	{"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"},
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	{NULL, NULL}
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};
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PyMODINIT_FUNC initbdiff(void)
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{
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	Py_InitModule3("bdiff", methods, mdiff_doc);
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}