Mercurial > hg
annotate mercurial/mpatch.c @ 16422:c0b5bab3fb11
changegroupsubset: avoid setdefault in inner loop
author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 13 Apr 2012 22:55:46 -0500 |
parents | e501f45b0eba |
children | d126a0d16856 |
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 | |
2859 | 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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27 #include "util.h" |
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28 |
72 | 29 static char mpatch_doc[] = "Efficient binary patching."; |
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30 static PyObject *mpatch_Error; |
72 | 31 |
32 struct frag { | |
33 int start, end, len; | |
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34 const char *data; |
72 | 35 }; |
36 | |
37 struct flist { | |
38 struct frag *base, *head, *tail; | |
39 }; | |
40 | |
41 static struct flist *lalloc(int size) | |
42 { | |
128 | 43 struct flist *a = NULL; |
72 | 44 |
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45 if (size < 1) |
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46 size = 1; |
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47 |
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48 a = (struct flist *)malloc(sizeof(struct flist)); |
128 | 49 if (a) { |
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50 a->base = (struct frag *)malloc(sizeof(struct frag) * size); |
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51 if (a->base) { |
128 | 52 a->head = a->tail = a->base; |
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53 return a; |
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54 } |
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55 free(a); |
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56 a = NULL; |
128 | 57 } |
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58 if (!PyErr_Occurred()) |
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59 PyErr_NoMemory(); |
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60 return NULL; |
72 | 61 } |
62 | |
63 static void lfree(struct flist *a) | |
64 { | |
128 | 65 if (a) { |
66 free(a->base); | |
67 free(a); | |
68 } | |
72 | 69 } |
70 | |
71 static int lsize(struct flist *a) | |
72 { | |
73 return a->tail - a->head; | |
74 } | |
75 | |
76 /* move hunks in source that are less cut to dest, compensating | |
77 for changes in offset. the last hunk may be split if necessary. | |
78 */ | |
79 static int gather(struct flist *dest, struct flist *src, int cut, int offset) | |
80 { | |
81 struct frag *d = dest->tail, *s = src->head; | |
82 int postend, c, l; | |
83 | |
84 while (s != src->tail) { | |
85 if (s->start + offset >= cut) | |
82 | 86 break; /* we've gone far enough */ |
72 | 87 |
88 postend = offset + s->start + s->len; | |
89 if (postend <= cut) { | |
90 /* save this hunk */ | |
91 offset += s->start + s->len - s->end; | |
92 *d++ = *s++; | |
93 } | |
94 else { | |
95 /* break up this hunk */ | |
96 c = cut - offset; | |
97 if (s->end < c) | |
98 c = s->end; | |
99 l = cut - offset - s->start; | |
100 if (s->len < l) | |
101 l = s->len; | |
102 | |
103 offset += s->start + l - c; | |
104 | |
105 d->start = s->start; | |
106 d->end = c; | |
107 d->len = l; | |
108 d->data = s->data; | |
109 d++; | |
110 s->start = c; | |
111 s->len = s->len - l; | |
112 s->data = s->data + l; | |
113 | |
82 | 114 break; |
72 | 115 } |
116 } | |
117 | |
118 dest->tail = d; | |
119 src->head = s; | |
120 return offset; | |
121 } | |
122 | |
123 /* like gather, but with no output list */ | |
124 static int discard(struct flist *src, int cut, int offset) | |
125 { | |
126 struct frag *s = src->head; | |
127 int postend, c, l; | |
128 | |
129 while (s != src->tail) { | |
130 if (s->start + offset >= cut) | |
82 | 131 break; |
72 | 132 |
133 postend = offset + s->start + s->len; | |
134 if (postend <= cut) { | |
135 offset += s->start + s->len - s->end; | |
136 s++; | |
137 } | |
138 else { | |
139 c = cut - offset; | |
140 if (s->end < c) | |
141 c = s->end; | |
142 l = cut - offset - s->start; | |
143 if (s->len < l) | |
144 l = s->len; | |
145 | |
146 offset += s->start + l - c; | |
147 s->start = c; | |
148 s->len = s->len - l; | |
149 s->data = s->data + l; | |
150 | |
82 | 151 break; |
72 | 152 } |
153 } | |
154 | |
155 src->head = s; | |
156 return offset; | |
157 } | |
158 | |
159 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
160 this deletes a and b and returns the resultant list. */ | |
161 static struct flist *combine(struct flist *a, struct flist *b) | |
162 { | |
128 | 163 struct flist *c = NULL; |
164 struct frag *bh, *ct; | |
72 | 165 int offset = 0, post; |
166 | |
128 | 167 if (a && b) |
168 c = lalloc((lsize(a) + lsize(b)) * 2); | |
169 | |
170 if (c) { | |
72 | 171 |
128 | 172 for (bh = b->head; bh != b->tail; bh++) { |
173 /* save old hunks */ | |
174 offset = gather(c, a, bh->start, offset); | |
72 | 175 |
128 | 176 /* discard replaced hunks */ |
177 post = discard(a, bh->end, offset); | |
72 | 178 |
128 | 179 /* insert new hunk */ |
180 ct = c->tail; | |
181 ct->start = bh->start - offset; | |
182 ct->end = bh->end - post; | |
183 ct->len = bh->len; | |
184 ct->data = bh->data; | |
185 c->tail++; | |
186 offset = post; | |
187 } | |
188 | |
189 /* hold on to tail from a */ | |
190 memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); | |
191 c->tail += lsize(a); | |
72 | 192 } |
193 | |
194 lfree(a); | |
195 lfree(b); | |
196 return c; | |
197 } | |
198 | |
199 /* decode a binary patch into a hunk list */ | |
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200 static struct flist *decode(const char *bin, int len) |
72 | 201 { |
202 struct flist *l; | |
203 struct frag *lt; | |
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204 const char *data = bin + 12, *end = bin + len; |
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205 uint32_t decode[3]; /* for dealing with alignment issues */ |
72 | 206 |
207 /* assume worst case size, we won't have many of these lists */ | |
208 l = lalloc(len / 12); | |
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209 if (!l) |
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210 return NULL; |
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211 |
72 | 212 lt = l->tail; |
213 | |
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214 while (data <= end) { |
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215 memcpy(decode, bin, 12); |
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216 lt->start = ntohl(decode[0]); |
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217 lt->end = ntohl(decode[1]); |
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218 lt->len = ntohl(decode[2]); |
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219 if (lt->start > lt->end) |
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220 break; /* sanity check */ |
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221 bin = data + lt->len; |
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222 if (bin < data) |
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223 break; /* big data + big (bogus) len can wrap around */ |
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224 lt->data = data; |
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225 data = bin + 12; |
72 | 226 lt++; |
227 } | |
228 | |
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229 if (bin != end) { |
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230 if (!PyErr_Occurred()) |
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231 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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232 lfree(l); |
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233 return NULL; |
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234 } |
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235 |
72 | 236 l->tail = lt; |
237 return l; | |
238 } | |
239 | |
240 /* calculate the size of resultant text */ | |
241 static int calcsize(int len, struct flist *l) | |
242 { | |
243 int outlen = 0, last = 0; | |
244 struct frag *f = l->head; | |
245 | |
246 while (f != l->tail) { | |
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247 if (f->start < last || f->end > len) { |
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248 if (!PyErr_Occurred()) |
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249 PyErr_SetString(mpatch_Error, |
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250 "invalid patch"); |
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251 return -1; |
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252 } |
72 | 253 outlen += f->start - last; |
254 last = f->end; | |
255 outlen += f->len; | |
256 f++; | |
257 } | |
258 | |
259 outlen += len - last; | |
260 return outlen; | |
261 } | |
262 | |
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263 static int apply(char *buf, const char *orig, int len, struct flist *l) |
72 | 264 { |
265 struct frag *f = l->head; | |
266 int last = 0; | |
267 char *p = buf; | |
268 | |
269 while (f != l->tail) { | |
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270 if (f->start < last || f->end > len) { |
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271 if (!PyErr_Occurred()) |
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272 PyErr_SetString(mpatch_Error, |
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273 "invalid patch"); |
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274 return 0; |
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275 } |
72 | 276 memcpy(p, orig + last, f->start - last); |
277 p += f->start - last; | |
278 memcpy(p, f->data, f->len); | |
279 last = f->end; | |
280 p += f->len; | |
281 f++; | |
282 } | |
283 memcpy(p, orig + last, len - last); | |
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284 return 1; |
72 | 285 } |
286 | |
287 /* recursively generate a patch of all bins between start and end */ | |
288 static struct flist *fold(PyObject *bins, int start, int end) | |
289 { | |
290 int len; | |
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291 Py_ssize_t blen; |
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292 const char *buffer; |
72 | 293 |
294 if (start + 1 == end) { | |
295 /* trivial case, output a decoded list */ | |
296 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 297 if (!tmp) |
298 return NULL; | |
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299 if (PyObject_AsCharBuffer(tmp, &buffer, &blen)) |
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300 return NULL; |
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301 return decode(buffer, blen); |
72 | 302 } |
303 | |
304 /* divide and conquer, memory management is elsewhere */ | |
305 len = (end - start) / 2; | |
306 return combine(fold(bins, start, start + len), | |
307 fold(bins, start + len, end)); | |
308 } | |
309 | |
310 static PyObject * | |
311 patches(PyObject *self, PyObject *args) | |
312 { | |
313 PyObject *text, *bins, *result; | |
314 struct flist *patch; | |
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315 const char *in; |
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316 char *out; |
72 | 317 int len, outlen; |
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318 Py_ssize_t inlen; |
72 | 319 |
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320 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 321 return NULL; |
322 | |
323 len = PyList_Size(bins); | |
324 if (!len) { | |
325 /* nothing to do */ | |
326 Py_INCREF(text); | |
327 return text; | |
328 } | |
329 | |
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330 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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331 return NULL; |
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332 |
72 | 333 patch = fold(bins, 0, len); |
128 | 334 if (!patch) |
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335 return NULL; |
128 | 336 |
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337 outlen = calcsize(inlen, patch); |
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338 if (outlen < 0) { |
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339 result = NULL; |
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340 goto cleanup; |
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341 } |
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342 result = PyBytes_FromStringAndSize(NULL, outlen); |
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343 if (!result) { |
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344 result = NULL; |
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345 goto cleanup; |
128 | 346 } |
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347 out = PyBytes_AsString(result); |
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348 if (!apply(out, in, inlen, patch)) { |
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349 Py_DECREF(result); |
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350 result = NULL; |
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351 } |
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352 cleanup: |
72 | 353 lfree(patch); |
354 return result; | |
355 } | |
356 | |
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357 /* calculate size of a patched file directly */ |
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358 static PyObject * |
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359 patchedsize(PyObject *self, PyObject *args) |
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360 { |
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361 long orig, start, end, len, outlen = 0, last = 0; |
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362 int patchlen; |
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363 char *bin, *binend, *data; |
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364 uint32_t decode[3]; /* for dealing with alignment issues */ |
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365 |
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366 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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367 return NULL; |
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368 |
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369 binend = bin + patchlen; |
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370 data = bin + 12; |
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371 |
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372 while (data <= binend) { |
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373 memcpy(decode, bin, 12); |
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374 start = ntohl(decode[0]); |
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375 end = ntohl(decode[1]); |
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376 len = ntohl(decode[2]); |
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377 if (start > end) |
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378 break; /* sanity check */ |
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379 bin = data + len; |
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380 if (bin < data) |
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381 break; /* big data + big (bogus) len can wrap around */ |
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382 data = bin + 12; |
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383 outlen += start - last; |
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384 last = end; |
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385 outlen += len; |
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386 } |
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387 |
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388 if (bin != binend) { |
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389 if (!PyErr_Occurred()) |
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390 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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391 return NULL; |
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392 } |
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393 |
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394 outlen += orig - last; |
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395 return Py_BuildValue("l", outlen); |
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396 } |
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397 |
72 | 398 static PyMethodDef methods[] = { |
399 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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400 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 401 {NULL, NULL} |
402 }; | |
403 | |
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404 #ifdef IS_PY3K |
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405 static struct PyModuleDef mpatch_module = { |
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406 PyModuleDef_HEAD_INIT, |
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407 "mpatch", |
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408 mpatch_doc, |
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409 -1, |
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410 methods |
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411 }; |
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412 |
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413 PyMODINIT_FUNC PyInit_mpatch(void) |
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414 { |
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415 PyObject *m; |
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416 |
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417 m = PyModule_Create(&mpatch_module); |
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418 if (m == NULL) |
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419 return NULL; |
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420 |
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421 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
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422 Py_INCREF(mpatch_Error); |
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423 PyModule_AddObject(m, "mpatchError", mpatch_Error); |
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424 |
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425 return m; |
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426 } |
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427 #else |
72 | 428 PyMODINIT_FUNC |
429 initmpatch(void) | |
430 { | |
431 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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432 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 433 } |
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434 #endif |