author | Matt Mackall <mpm@selenic.com> |
Sat, 01 Oct 2005 13:11:48 -0700 | |
changeset 1370 | 710079d2a821 |
parent 981 | 4f81068ed8cd |
child 1397 | 66fd3bc1cfcf |
permissions | -rw-r--r-- |
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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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|
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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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|
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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 __hpux |
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#define inline |
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#endif |
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#ifdef _WIN32 |
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#ifdef _MSC_VER |
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#define inline __inline |
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typedef unsigned long uint32_t; |
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#else |
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#include <stdint.h> |
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#endif |
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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 <sys/types.h> |
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#include <arpa/inet.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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||
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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 */ |
474 | 144 |
for (j = a[i].h & buckets; h[j].pos != -1; |
145 |
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 */ |
474 | 150 |
if(h[j].len <= t) |
151 |
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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changeset
|
155 |
|
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|
156 |
/* discard hash tables */ |
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changeset
|
157 |
free(h); |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
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changeset
|
158 |
return 1; |
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Add a fast binary diff extension (not yet used)
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parents:
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changeset
|
159 |
} |
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|
160 |
|
474 | 161 |
static int longest_match(struct line *a, struct line *b, struct pos *pos, |
400
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changeset
|
162 |
int a1, int a2, int b1, int b2, int *omi, int *omj) |
8b067bde6679
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|
163 |
{ |
8b067bde6679
Add a fast binary diff extension (not yet used)
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diff
changeset
|
164 |
int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
8b067bde6679
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changeset
|
165 |
|
8b067bde6679
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parents:
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changeset
|
166 |
for (i = a1; i < a2; i++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
167 |
/* skip things before the current block */ |
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parents:
diff
changeset
|
168 |
for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
8b067bde6679
Add a fast binary diff extension (not yet used)
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|
169 |
; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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|
170 |
|
8b067bde6679
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|
171 |
/* loop through all lines match a[i] in b */ |
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changeset
|
172 |
for (; j != -1 && j < b2; j = b[j].n) { |
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Add a fast binary diff extension (not yet used)
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changeset
|
173 |
/* does this extend an earlier match? */ |
474 | 174 |
if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
175 |
k = pos[j - 1].len + 1; |
|
400
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|
176 |
else |
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|
177 |
k = 1; |
474 | 178 |
pos[j].pos = i; |
179 |
pos[j].len = k; |
|
400
8b067bde6679
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|
180 |
|
8b067bde6679
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diff
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|
181 |
/* best match so far? */ |
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diff
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|
182 |
if (k > mk) { |
8b067bde6679
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parents:
diff
changeset
|
183 |
mi = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
184 |
mj = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
185 |
mk = k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
186 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
187 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
188 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
189 |
|
8b067bde6679
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parents:
diff
changeset
|
190 |
if (mk) { |
8b067bde6679
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parents:
diff
changeset
|
191 |
mi = mi - mk + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
192 |
mj = mj - mk + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
193 |
} |
8b067bde6679
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parents:
diff
changeset
|
194 |
|
8b067bde6679
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parents:
diff
changeset
|
195 |
/* expand match to include neighboring popular lines */ |
8b067bde6679
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diff
changeset
|
196 |
while (mi - mb > a1 && mj - mb > b1 && |
433
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411
diff
changeset
|
197 |
a[mi - mb - 1].e == b[mj - mb - 1].e) |
400
8b067bde6679
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|
198 |
mb++; |
8b067bde6679
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parents:
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changeset
|
199 |
while (mi + mk < a2 && mj + mk < b2 && |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
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diff
changeset
|
200 |
a[mi + mk].e == b[mj + mk].e) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
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changeset
|
201 |
mk++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
202 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
203 |
*omi = mi - mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
204 |
*omj = mj - mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
205 |
return mk + mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
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changeset
|
206 |
} |
8b067bde6679
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mpm@selenic.com
parents:
diff
changeset
|
207 |
|
474 | 208 |
static void recurse(struct line *a, struct line *b, struct pos *pos, |
400
8b067bde6679
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changeset
|
209 |
int a1, int a2, int b1, int b2, struct hunklist *l) |
8b067bde6679
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parents:
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changeset
|
210 |
{ |
8b067bde6679
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parents:
diff
changeset
|
211 |
int i, j, k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
212 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
213 |
/* find the longest match in this chunk */ |
474 | 214 |
k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
400
8b067bde6679
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parents:
diff
changeset
|
215 |
if (!k) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
216 |
return; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
217 |
|
8b067bde6679
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parents:
diff
changeset
|
218 |
/* and recurse on the remaining chunks on either side */ |
474 | 219 |
recurse(a, b, pos, a1, i, b1, j, l); |
400
8b067bde6679
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parents:
diff
changeset
|
220 |
l->head->a1 = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
221 |
l->head->a2 = i + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
222 |
l->head->b1 = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
223 |
l->head->b2 = j + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
224 |
l->head++; |
474 | 225 |
recurse(a, b, pos, i + k, a2, j + k, b2, l); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
226 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
227 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
228 |
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
|
229 |
{ |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
230 |
struct hunklist l; |
474 | 231 |
struct pos *pos; |
232 |
int t; |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
233 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
234 |
/* allocate and fill arrays */ |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
235 |
t = equatelines(a, an, b, bn); |
474 | 236 |
pos = calloc(bn, sizeof(struct pos)); |
827
a61728b58dc0
Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents:
597
diff
changeset
|
237 |
/* we can't have more matches than lines in the shorter file */ |
a61728b58dc0
Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents:
597
diff
changeset
|
238 |
l.head = l.base = malloc(sizeof(struct hunk) * ((an<bn ? an:bn) + 1)); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
239 |
|
474 | 240 |
if (pos && l.base && t) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
241 |
/* generate the matching block list */ |
474 | 242 |
recurse(a, b, pos, 0, an, 0, bn, &l); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
243 |
l.head->a1 = an; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
244 |
l.head->b1 = bn; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
245 |
l.head++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
246 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
247 |
|
474 | 248 |
free(pos); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
249 |
return l; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
250 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
251 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
252 |
static PyObject *blocks(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
253 |
{ |
435 | 254 |
PyObject *sa, *sb, *rl = NULL, *m; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
255 |
struct line *a, *b; |
970 | 256 |
struct hunklist l = {NULL, NULL}; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
257 |
struct hunk *h; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
258 |
int an, bn, pos = 0; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
259 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
260 |
if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
261 |
return NULL; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
262 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
263 |
an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
264 |
bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
265 |
if (!a || !b) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
266 |
goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
267 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
268 |
l = diff(a, an, b, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
269 |
rl = PyList_New(l.head - l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
270 |
if (!l.head || !rl) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
271 |
goto nomem; |
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 |
for(h = l.base; h != l.head; h++) { |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
274 |
m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
79c694462294
Add bdiff.blocks / minor performance tweaks
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parents:
411
diff
changeset
|
275 |
PyList_SetItem(rl, pos, m); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
276 |
pos++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
277 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
278 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
279 |
nomem: |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
280 |
free(a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
281 |
free(b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
282 |
free(l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
283 |
return rl ? rl : PyErr_NoMemory(); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
284 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
285 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
286 |
static PyObject *bdiff(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
287 |
{ |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
288 |
PyObject *sa, *sb, *result = NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
289 |
struct line *al, *bl; |
970 | 290 |
struct hunklist l = {NULL, NULL}; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
291 |
struct hunk *h; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
292 |
char encode[12], *rb; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
293 |
int an, bn, len = 0, la = 0, lb = 0; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
294 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
295 |
if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
296 |
return NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
297 |
|
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
298 |
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
|
299 |
bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
300 |
if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
301 |
goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
302 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
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411
diff
changeset
|
303 |
l = diff(al, an, bl, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
304 |
if (!l.head) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
305 |
goto nomem; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
306 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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changeset
|
307 |
/* calculate length of output */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
|
308 |
for(h = l.base; h != l.head; h++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
309 |
if (h->a1 != la || h->b1 != lb) |
8b067bde6679
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parents:
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changeset
|
310 |
len += 12 + bl[h->b1].l - bl[lb].l; |
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Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
311 |
la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
312 |
lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
313 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
314 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
315 |
result = PyString_FromStringAndSize(NULL, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
316 |
if (!result) |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
317 |
goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
318 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
319 |
/* build binary patch */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
320 |
rb = PyString_AsString(result); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
321 |
la = lb = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
322 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
323 |
for(h = l.base; h != l.head; h++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
324 |
if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
325 |
len = bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
326 |
*(uint32_t *)(encode) = htonl(al[la].l - al->l); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
327 |
*(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
328 |
*(uint32_t *)(encode + 8) = htonl(len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
329 |
memcpy(rb, encode, 12); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
330 |
memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
331 |
rb += 12 + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
332 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
333 |
la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
334 |
lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
335 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
336 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
337 |
nomem: |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
338 |
free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
339 |
free(bl); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
340 |
free(l.base); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
341 |
return result ? result : PyErr_NoMemory(); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
342 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
343 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
344 |
static char mdiff_doc[] = "Efficient binary diff."; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
345 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
346 |
static PyMethodDef methods[] = { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
347 |
{"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
348 |
{"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
349 |
{NULL, NULL} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
350 |
}; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
351 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
352 |
PyMODINIT_FUNC initbdiff(void) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
353 |
{ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
354 |
Py_InitModule3("bdiff", methods, mdiff_doc); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
355 |
} |