Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mpatch.c @ 2911:95cc73523983
Use revlog hash comparison technique in merge
author | Matt Mackall <mpm@selenic.com> |
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date | Tue, 15 Aug 2006 15:45:45 -0500 |
parents | 345bac2bc4ec |
children | cc856c4d91ca |
rev | line source |
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72 | 1 /* |
2 mpatch.c - efficient binary patching for Mercurial | |
3 | |
4 This implements a patch algorithm that's O(m + nlog n) where m is the | |
5 size of the output and n is the number of patches. | |
6 | |
7 Given a list of binary patches, it unpacks each into a hunk list, | |
8 then combines the hunk lists with a treewise recursion to form a | |
9 single hunk list. This hunk list is then applied to the original | |
10 text. | |
11 | |
12 The text (or binary) fragments are copied directly from their source | |
13 Python objects into a preallocated output string to avoid the | |
14 allocation of intermediate Python objects. Working memory is about 2x | |
15 the total number of hunks. | |
16 | |
2858 | 17 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
72 | 18 |
19 This software may be used and distributed according to the terms | |
20 of the GNU General Public License, incorporated herein by reference. | |
21 */ | |
22 | |
23 #include <Python.h> | |
24 #include <stdlib.h> | |
25 #include <string.h> | |
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26 |
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27 #ifdef _WIN32 |
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28 # ifdef _MSC_VER |
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29 /* msvc 6.0 has problems */ |
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30 # define inline __inline |
551 | 31 typedef unsigned long uint32_t; |
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32 # else |
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33 # include <stdint.h> |
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34 # endif |
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35 static uint32_t ntohl(uint32_t x) |
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36 { |
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37 return ((x & 0x000000ffUL) << 24) | |
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38 ((x & 0x0000ff00UL) << 8) | |
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39 ((x & 0x00ff0000UL) >> 8) | |
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40 ((x & 0xff000000UL) >> 24); |
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41 } |
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42 #else |
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43 /* not windows */ |
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44 # include <sys/types.h> |
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45 # include <arpa/inet.h> |
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46 # include <inttypes.h> |
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47 #endif |
72 | 48 |
49 static char mpatch_doc[] = "Efficient binary patching."; | |
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50 static PyObject *mpatch_Error; |
72 | 51 |
52 struct frag { | |
53 int start, end, len; | |
54 char *data; | |
55 }; | |
56 | |
57 struct flist { | |
58 struct frag *base, *head, *tail; | |
59 }; | |
60 | |
61 static struct flist *lalloc(int size) | |
62 { | |
128 | 63 struct flist *a = NULL; |
72 | 64 |
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65 a = (struct flist *)malloc(sizeof(struct flist)); |
128 | 66 if (a) { |
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67 a->base = (struct frag *)malloc(sizeof(struct frag) * size); |
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68 if (a->base) { |
128 | 69 a->head = a->tail = a->base; |
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70 return a; |
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71 } |
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72 free(a); |
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73 a = NULL; |
128 | 74 } |
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75 if (!PyErr_Occurred()) |
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76 PyErr_NoMemory(); |
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77 return NULL; |
72 | 78 } |
79 | |
80 static void lfree(struct flist *a) | |
81 { | |
128 | 82 if (a) { |
83 free(a->base); | |
84 free(a); | |
85 } | |
72 | 86 } |
87 | |
88 static int lsize(struct flist *a) | |
89 { | |
90 return a->tail - a->head; | |
91 } | |
92 | |
93 /* move hunks in source that are less cut to dest, compensating | |
94 for changes in offset. the last hunk may be split if necessary. | |
95 */ | |
96 static int gather(struct flist *dest, struct flist *src, int cut, int offset) | |
97 { | |
98 struct frag *d = dest->tail, *s = src->head; | |
99 int postend, c, l; | |
100 | |
101 while (s != src->tail) { | |
102 if (s->start + offset >= cut) | |
82 | 103 break; /* we've gone far enough */ |
72 | 104 |
105 postend = offset + s->start + s->len; | |
106 if (postend <= cut) { | |
107 /* save this hunk */ | |
108 offset += s->start + s->len - s->end; | |
109 *d++ = *s++; | |
110 } | |
111 else { | |
112 /* break up this hunk */ | |
113 c = cut - offset; | |
114 if (s->end < c) | |
115 c = s->end; | |
116 l = cut - offset - s->start; | |
117 if (s->len < l) | |
118 l = s->len; | |
119 | |
120 offset += s->start + l - c; | |
121 | |
122 d->start = s->start; | |
123 d->end = c; | |
124 d->len = l; | |
125 d->data = s->data; | |
126 d++; | |
127 s->start = c; | |
128 s->len = s->len - l; | |
129 s->data = s->data + l; | |
130 | |
82 | 131 break; |
72 | 132 } |
133 } | |
134 | |
135 dest->tail = d; | |
136 src->head = s; | |
137 return offset; | |
138 } | |
139 | |
140 /* like gather, but with no output list */ | |
141 static int discard(struct flist *src, int cut, int offset) | |
142 { | |
143 struct frag *s = src->head; | |
144 int postend, c, l; | |
145 | |
146 while (s != src->tail) { | |
147 if (s->start + offset >= cut) | |
82 | 148 break; |
72 | 149 |
150 postend = offset + s->start + s->len; | |
151 if (postend <= cut) { | |
152 offset += s->start + s->len - s->end; | |
153 s++; | |
154 } | |
155 else { | |
156 c = cut - offset; | |
157 if (s->end < c) | |
158 c = s->end; | |
159 l = cut - offset - s->start; | |
160 if (s->len < l) | |
161 l = s->len; | |
162 | |
163 offset += s->start + l - c; | |
164 s->start = c; | |
165 s->len = s->len - l; | |
166 s->data = s->data + l; | |
167 | |
82 | 168 break; |
72 | 169 } |
170 } | |
171 | |
172 src->head = s; | |
173 return offset; | |
174 } | |
175 | |
176 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
177 this deletes a and b and returns the resultant list. */ | |
178 static struct flist *combine(struct flist *a, struct flist *b) | |
179 { | |
128 | 180 struct flist *c = NULL; |
181 struct frag *bh, *ct; | |
72 | 182 int offset = 0, post; |
183 | |
128 | 184 if (a && b) |
185 c = lalloc((lsize(a) + lsize(b)) * 2); | |
186 | |
187 if (c) { | |
72 | 188 |
128 | 189 for (bh = b->head; bh != b->tail; bh++) { |
190 /* save old hunks */ | |
191 offset = gather(c, a, bh->start, offset); | |
72 | 192 |
128 | 193 /* discard replaced hunks */ |
194 post = discard(a, bh->end, offset); | |
72 | 195 |
128 | 196 /* insert new hunk */ |
197 ct = c->tail; | |
198 ct->start = bh->start - offset; | |
199 ct->end = bh->end - post; | |
200 ct->len = bh->len; | |
201 ct->data = bh->data; | |
202 c->tail++; | |
203 offset = post; | |
204 } | |
205 | |
206 /* hold on to tail from a */ | |
207 memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); | |
208 c->tail += lsize(a); | |
72 | 209 } |
210 | |
211 lfree(a); | |
212 lfree(b); | |
213 return c; | |
214 } | |
215 | |
216 /* decode a binary patch into a hunk list */ | |
217 static struct flist *decode(char *bin, int len) | |
218 { | |
219 struct flist *l; | |
220 struct frag *lt; | |
221 char *end = bin + len; | |
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222 char decode[12]; /* for dealing with alignment issues */ |
72 | 223 |
224 /* assume worst case size, we won't have many of these lists */ | |
225 l = lalloc(len / 12); | |
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226 if (!l) |
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227 return NULL; |
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228 |
72 | 229 lt = l->tail; |
230 | |
231 while (bin < end) { | |
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232 memcpy(decode, bin, 12); |
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233 lt->start = ntohl(*(uint32_t *)decode); |
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234 lt->end = ntohl(*(uint32_t *)(decode + 4)); |
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235 lt->len = ntohl(*(uint32_t *)(decode + 8)); |
72 | 236 lt->data = bin + 12; |
237 bin += 12 + lt->len; | |
238 lt++; | |
239 } | |
240 | |
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241 if (bin != end) { |
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242 if (!PyErr_Occurred()) |
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243 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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244 lfree(l); |
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245 return NULL; |
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246 } |
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247 |
72 | 248 l->tail = lt; |
249 return l; | |
250 } | |
251 | |
252 /* calculate the size of resultant text */ | |
253 static int calcsize(int len, struct flist *l) | |
254 { | |
255 int outlen = 0, last = 0; | |
256 struct frag *f = l->head; | |
257 | |
258 while (f != l->tail) { | |
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259 if (f->start < last || f->end > len) { |
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260 if (!PyErr_Occurred()) |
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261 PyErr_SetString(mpatch_Error, |
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262 "invalid patch"); |
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263 return -1; |
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264 } |
72 | 265 outlen += f->start - last; |
266 last = f->end; | |
267 outlen += f->len; | |
268 f++; | |
269 } | |
270 | |
271 outlen += len - last; | |
272 return outlen; | |
273 } | |
274 | |
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275 static int apply(char *buf, char *orig, int len, struct flist *l) |
72 | 276 { |
277 struct frag *f = l->head; | |
278 int last = 0; | |
279 char *p = buf; | |
280 | |
281 while (f != l->tail) { | |
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282 if (f->start < last || f->end > len) { |
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283 if (!PyErr_Occurred()) |
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284 PyErr_SetString(mpatch_Error, |
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285 "invalid patch"); |
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286 return 0; |
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287 } |
72 | 288 memcpy(p, orig + last, f->start - last); |
289 p += f->start - last; | |
290 memcpy(p, f->data, f->len); | |
291 last = f->end; | |
292 p += f->len; | |
293 f++; | |
294 } | |
295 memcpy(p, orig + last, len - last); | |
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296 return 1; |
72 | 297 } |
298 | |
299 /* recursively generate a patch of all bins between start and end */ | |
300 static struct flist *fold(PyObject *bins, int start, int end) | |
301 { | |
302 int len; | |
303 | |
304 if (start + 1 == end) { | |
305 /* trivial case, output a decoded list */ | |
306 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 307 if (!tmp) |
308 return NULL; | |
72 | 309 return decode(PyString_AsString(tmp), PyString_Size(tmp)); |
310 } | |
311 | |
312 /* divide and conquer, memory management is elsewhere */ | |
313 len = (end - start) / 2; | |
314 return combine(fold(bins, start, start + len), | |
315 fold(bins, start + len, end)); | |
316 } | |
317 | |
318 static PyObject * | |
319 patches(PyObject *self, PyObject *args) | |
320 { | |
321 PyObject *text, *bins, *result; | |
322 struct flist *patch; | |
323 char *in, *out; | |
324 int len, outlen; | |
325 | |
128 | 326 if (!PyArg_ParseTuple(args, "SO:mpatch", &text, &bins)) |
72 | 327 return NULL; |
328 | |
329 len = PyList_Size(bins); | |
330 if (!len) { | |
331 /* nothing to do */ | |
332 Py_INCREF(text); | |
333 return text; | |
334 } | |
335 | |
336 patch = fold(bins, 0, len); | |
128 | 337 if (!patch) |
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338 return NULL; |
128 | 339 |
72 | 340 outlen = calcsize(PyString_Size(text), patch); |
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341 if (outlen < 0) { |
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342 result = NULL; |
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343 goto cleanup; |
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344 } |
72 | 345 result = PyString_FromStringAndSize(NULL, outlen); |
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346 if (!result) { |
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347 result = NULL; |
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348 goto cleanup; |
128 | 349 } |
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350 in = PyString_AsString(text); |
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351 out = PyString_AsString(result); |
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352 if (!apply(out, in, PyString_Size(text), patch)) { |
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353 Py_DECREF(result); |
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354 result = NULL; |
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355 } |
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356 cleanup: |
72 | 357 lfree(patch); |
358 return result; | |
359 } | |
360 | |
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361 /* calculate size of a patched file directly */ |
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362 static PyObject * |
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363 patchedsize(PyObject *self, PyObject *args) |
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364 { |
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365 long orig, start, end, len, outlen = 0, last = 0; |
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366 int patchlen; |
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367 char *bin, *binend; |
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368 char decode[12]; /* for dealing with alignment issues */ |
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369 |
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370 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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371 return NULL; |
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372 |
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373 binend = bin + patchlen; |
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374 |
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375 while (bin < binend) { |
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376 memcpy(decode, bin, 12); |
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377 start = ntohl(*(uint32_t *)decode); |
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378 end = ntohl(*(uint32_t *)(decode + 4)); |
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379 len = ntohl(*(uint32_t *)(decode + 8)); |
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380 bin += 12 + len; |
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381 outlen += start - last; |
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382 last = end; |
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383 outlen += len; |
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384 } |
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385 |
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386 if (bin != binend) { |
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387 if (!PyErr_Occurred()) |
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388 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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389 return NULL; |
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390 } |
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391 |
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392 outlen += orig - last; |
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393 return Py_BuildValue("l", outlen); |
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394 } |
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395 |
72 | 396 static PyMethodDef methods[] = { |
397 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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398 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 399 {NULL, NULL} |
400 }; | |
401 | |
402 PyMODINIT_FUNC | |
403 initmpatch(void) | |
404 { | |
405 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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406 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 407 } |
408 |