Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/mpatch.c @ 3455:10b6fc51f672
Don't show empty list of files in hg log -v.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Wed, 18 Oct 2006 12:26:12 +0200 |
parents | cc856c4d91ca |
children | 95ffa36d1d2a 11dc22eb8e8d |
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 if (size < 1) |
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66 size = 1; |
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67 |
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68 a = (struct flist *)malloc(sizeof(struct flist)); |
128 | 69 if (a) { |
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70 a->base = (struct frag *)malloc(sizeof(struct frag) * size); |
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71 if (a->base) { |
128 | 72 a->head = a->tail = a->base; |
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73 return a; |
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74 } |
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75 free(a); |
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76 a = NULL; |
128 | 77 } |
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78 if (!PyErr_Occurred()) |
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79 PyErr_NoMemory(); |
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80 return NULL; |
72 | 81 } |
82 | |
83 static void lfree(struct flist *a) | |
84 { | |
128 | 85 if (a) { |
86 free(a->base); | |
87 free(a); | |
88 } | |
72 | 89 } |
90 | |
91 static int lsize(struct flist *a) | |
92 { | |
93 return a->tail - a->head; | |
94 } | |
95 | |
96 /* move hunks in source that are less cut to dest, compensating | |
97 for changes in offset. the last hunk may be split if necessary. | |
98 */ | |
99 static int gather(struct flist *dest, struct flist *src, int cut, int offset) | |
100 { | |
101 struct frag *d = dest->tail, *s = src->head; | |
102 int postend, c, l; | |
103 | |
104 while (s != src->tail) { | |
105 if (s->start + offset >= cut) | |
82 | 106 break; /* we've gone far enough */ |
72 | 107 |
108 postend = offset + s->start + s->len; | |
109 if (postend <= cut) { | |
110 /* save this hunk */ | |
111 offset += s->start + s->len - s->end; | |
112 *d++ = *s++; | |
113 } | |
114 else { | |
115 /* break up this hunk */ | |
116 c = cut - offset; | |
117 if (s->end < c) | |
118 c = s->end; | |
119 l = cut - offset - s->start; | |
120 if (s->len < l) | |
121 l = s->len; | |
122 | |
123 offset += s->start + l - c; | |
124 | |
125 d->start = s->start; | |
126 d->end = c; | |
127 d->len = l; | |
128 d->data = s->data; | |
129 d++; | |
130 s->start = c; | |
131 s->len = s->len - l; | |
132 s->data = s->data + l; | |
133 | |
82 | 134 break; |
72 | 135 } |
136 } | |
137 | |
138 dest->tail = d; | |
139 src->head = s; | |
140 return offset; | |
141 } | |
142 | |
143 /* like gather, but with no output list */ | |
144 static int discard(struct flist *src, int cut, int offset) | |
145 { | |
146 struct frag *s = src->head; | |
147 int postend, c, l; | |
148 | |
149 while (s != src->tail) { | |
150 if (s->start + offset >= cut) | |
82 | 151 break; |
72 | 152 |
153 postend = offset + s->start + s->len; | |
154 if (postend <= cut) { | |
155 offset += s->start + s->len - s->end; | |
156 s++; | |
157 } | |
158 else { | |
159 c = cut - offset; | |
160 if (s->end < c) | |
161 c = s->end; | |
162 l = cut - offset - s->start; | |
163 if (s->len < l) | |
164 l = s->len; | |
165 | |
166 offset += s->start + l - c; | |
167 s->start = c; | |
168 s->len = s->len - l; | |
169 s->data = s->data + l; | |
170 | |
82 | 171 break; |
72 | 172 } |
173 } | |
174 | |
175 src->head = s; | |
176 return offset; | |
177 } | |
178 | |
179 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
180 this deletes a and b and returns the resultant list. */ | |
181 static struct flist *combine(struct flist *a, struct flist *b) | |
182 { | |
128 | 183 struct flist *c = NULL; |
184 struct frag *bh, *ct; | |
72 | 185 int offset = 0, post; |
186 | |
128 | 187 if (a && b) |
188 c = lalloc((lsize(a) + lsize(b)) * 2); | |
189 | |
190 if (c) { | |
72 | 191 |
128 | 192 for (bh = b->head; bh != b->tail; bh++) { |
193 /* save old hunks */ | |
194 offset = gather(c, a, bh->start, offset); | |
72 | 195 |
128 | 196 /* discard replaced hunks */ |
197 post = discard(a, bh->end, offset); | |
72 | 198 |
128 | 199 /* insert new hunk */ |
200 ct = c->tail; | |
201 ct->start = bh->start - offset; | |
202 ct->end = bh->end - post; | |
203 ct->len = bh->len; | |
204 ct->data = bh->data; | |
205 c->tail++; | |
206 offset = post; | |
207 } | |
208 | |
209 /* hold on to tail from a */ | |
210 memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); | |
211 c->tail += lsize(a); | |
72 | 212 } |
213 | |
214 lfree(a); | |
215 lfree(b); | |
216 return c; | |
217 } | |
218 | |
219 /* decode a binary patch into a hunk list */ | |
220 static struct flist *decode(char *bin, int len) | |
221 { | |
222 struct flist *l; | |
223 struct frag *lt; | |
224 char *end = bin + len; | |
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225 char decode[12]; /* for dealing with alignment issues */ |
72 | 226 |
227 /* assume worst case size, we won't have many of these lists */ | |
228 l = lalloc(len / 12); | |
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229 if (!l) |
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230 return NULL; |
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231 |
72 | 232 lt = l->tail; |
233 | |
234 while (bin < end) { | |
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235 memcpy(decode, bin, 12); |
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236 lt->start = ntohl(*(uint32_t *)decode); |
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237 lt->end = ntohl(*(uint32_t *)(decode + 4)); |
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238 lt->len = ntohl(*(uint32_t *)(decode + 8)); |
72 | 239 lt->data = bin + 12; |
240 bin += 12 + lt->len; | |
241 lt++; | |
242 } | |
243 | |
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244 if (bin != end) { |
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245 if (!PyErr_Occurred()) |
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246 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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247 lfree(l); |
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248 return NULL; |
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249 } |
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250 |
72 | 251 l->tail = lt; |
252 return l; | |
253 } | |
254 | |
255 /* calculate the size of resultant text */ | |
256 static int calcsize(int len, struct flist *l) | |
257 { | |
258 int outlen = 0, last = 0; | |
259 struct frag *f = l->head; | |
260 | |
261 while (f != l->tail) { | |
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262 if (f->start < last || f->end > len) { |
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263 if (!PyErr_Occurred()) |
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264 PyErr_SetString(mpatch_Error, |
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265 "invalid patch"); |
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266 return -1; |
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267 } |
72 | 268 outlen += f->start - last; |
269 last = f->end; | |
270 outlen += f->len; | |
271 f++; | |
272 } | |
273 | |
274 outlen += len - last; | |
275 return outlen; | |
276 } | |
277 | |
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278 static int apply(char *buf, char *orig, int len, struct flist *l) |
72 | 279 { |
280 struct frag *f = l->head; | |
281 int last = 0; | |
282 char *p = buf; | |
283 | |
284 while (f != l->tail) { | |
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285 if (f->start < last || f->end > len) { |
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286 if (!PyErr_Occurred()) |
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287 PyErr_SetString(mpatch_Error, |
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288 "invalid patch"); |
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289 return 0; |
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290 } |
72 | 291 memcpy(p, orig + last, f->start - last); |
292 p += f->start - last; | |
293 memcpy(p, f->data, f->len); | |
294 last = f->end; | |
295 p += f->len; | |
296 f++; | |
297 } | |
298 memcpy(p, orig + last, len - last); | |
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299 return 1; |
72 | 300 } |
301 | |
302 /* recursively generate a patch of all bins between start and end */ | |
303 static struct flist *fold(PyObject *bins, int start, int end) | |
304 { | |
305 int len; | |
306 | |
307 if (start + 1 == end) { | |
308 /* trivial case, output a decoded list */ | |
309 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 310 if (!tmp) |
311 return NULL; | |
72 | 312 return decode(PyString_AsString(tmp), PyString_Size(tmp)); |
313 } | |
314 | |
315 /* divide and conquer, memory management is elsewhere */ | |
316 len = (end - start) / 2; | |
317 return combine(fold(bins, start, start + len), | |
318 fold(bins, start + len, end)); | |
319 } | |
320 | |
321 static PyObject * | |
322 patches(PyObject *self, PyObject *args) | |
323 { | |
324 PyObject *text, *bins, *result; | |
325 struct flist *patch; | |
326 char *in, *out; | |
327 int len, outlen; | |
328 | |
128 | 329 if (!PyArg_ParseTuple(args, "SO:mpatch", &text, &bins)) |
72 | 330 return NULL; |
331 | |
332 len = PyList_Size(bins); | |
333 if (!len) { | |
334 /* nothing to do */ | |
335 Py_INCREF(text); | |
336 return text; | |
337 } | |
338 | |
339 patch = fold(bins, 0, len); | |
128 | 340 if (!patch) |
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341 return NULL; |
128 | 342 |
72 | 343 outlen = calcsize(PyString_Size(text), patch); |
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344 if (outlen < 0) { |
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345 result = NULL; |
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346 goto cleanup; |
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347 } |
72 | 348 result = PyString_FromStringAndSize(NULL, outlen); |
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349 if (!result) { |
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350 result = NULL; |
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351 goto cleanup; |
128 | 352 } |
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353 in = PyString_AsString(text); |
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354 out = PyString_AsString(result); |
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355 if (!apply(out, in, PyString_Size(text), patch)) { |
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356 Py_DECREF(result); |
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357 result = NULL; |
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358 } |
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359 cleanup: |
72 | 360 lfree(patch); |
361 return result; | |
362 } | |
363 | |
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364 /* calculate size of a patched file directly */ |
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365 static PyObject * |
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366 patchedsize(PyObject *self, PyObject *args) |
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367 { |
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368 long orig, start, end, len, outlen = 0, last = 0; |
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369 int patchlen; |
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370 char *bin, *binend; |
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371 char decode[12]; /* for dealing with alignment issues */ |
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372 |
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373 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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374 return NULL; |
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375 |
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376 binend = bin + patchlen; |
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377 |
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378 while (bin < binend) { |
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379 memcpy(decode, bin, 12); |
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380 start = ntohl(*(uint32_t *)decode); |
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381 end = ntohl(*(uint32_t *)(decode + 4)); |
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382 len = ntohl(*(uint32_t *)(decode + 8)); |
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383 bin += 12 + len; |
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384 outlen += start - last; |
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385 last = end; |
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386 outlen += len; |
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387 } |
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388 |
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389 if (bin != binend) { |
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390 if (!PyErr_Occurred()) |
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391 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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392 return NULL; |
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393 } |
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394 |
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395 outlen += orig - last; |
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396 return Py_BuildValue("l", outlen); |
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397 } |
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398 |
72 | 399 static PyMethodDef methods[] = { |
400 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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401 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 402 {NULL, NULL} |
403 }; | |
404 | |
405 PyMODINIT_FUNC | |
406 initmpatch(void) | |
407 { | |
408 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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409 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 410 } |
411 |