Mercurial > hg
annotate mercurial/mpatch.c @ 11148:a912f26777d3
merge: introduce tool.check parameter
tool.check is a list of check options, and can be used in place of
tool.checkchanged and tool.checkconflicts:
Equivalences:
tool.checkchanged = yes
tool.checkconflicts = no
tool.check = changed
tool.checkchanged = no
tool.checkconflicts = yes
tool.check = conflicts
tool.checkchanged = yes
tool.checkconflicts = yes
tool.check = changed, conflicts
Add _toollist() wrapper for ui.configlist() to implement this consistently.
checkchanged and checkconflicts are still supported, but check is
preferred for implementing new check options.
author | David Champion <dgc@uchicago.edu> |
---|---|
date | Mon, 10 May 2010 11:04:56 -0500 |
parents | 08a0f04b56bd |
children | 2ac98313b26c |
rev | line source |
---|---|
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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26 |
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27 /* Definitions to get compatibility with python 2.4 and earlier which |
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28 does not have Py_ssize_t. See also PEP 353. |
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29 Note: msvc (8 or earlier) does not have ssize_t, so we use Py_ssize_t. |
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30 */ |
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31 #if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN) |
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32 typedef int Py_ssize_t; |
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33 #define PY_SSIZE_T_MAX INT_MAX |
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34 #define PY_SSIZE_T_MIN INT_MIN |
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35 #endif |
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36 |
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37 #ifdef _WIN32 |
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38 #ifdef _MSC_VER |
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39 /* msvc 6.0 has problems */ |
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40 #define inline __inline |
551 | 41 typedef unsigned long uint32_t; |
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42 #else |
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43 #include <stdint.h> |
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44 #endif |
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45 static uint32_t ntohl(uint32_t x) |
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46 { |
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47 return ((x & 0x000000ffUL) << 24) | |
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48 ((x & 0x0000ff00UL) << 8) | |
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49 ((x & 0x00ff0000UL) >> 8) | |
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50 ((x & 0xff000000UL) >> 24); |
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51 } |
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52 #else |
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53 /* not windows */ |
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54 #include <sys/types.h> |
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55 #if defined __BEOS__ && !defined __HAIKU__ |
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56 #include <ByteOrder.h> |
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57 #else |
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58 #include <arpa/inet.h> |
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59 #endif |
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60 #include <inttypes.h> |
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61 #endif |
72 | 62 |
63 static char mpatch_doc[] = "Efficient binary patching."; | |
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64 static PyObject *mpatch_Error; |
72 | 65 |
66 struct frag { | |
67 int start, end, len; | |
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68 const char *data; |
72 | 69 }; |
70 | |
71 struct flist { | |
72 struct frag *base, *head, *tail; | |
73 }; | |
74 | |
75 static struct flist *lalloc(int size) | |
76 { | |
128 | 77 struct flist *a = NULL; |
72 | 78 |
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79 if (size < 1) |
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80 size = 1; |
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81 |
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82 a = (struct flist *)malloc(sizeof(struct flist)); |
128 | 83 if (a) { |
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84 a->base = (struct frag *)malloc(sizeof(struct frag) * size); |
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85 if (a->base) { |
128 | 86 a->head = a->tail = a->base; |
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87 return a; |
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88 } |
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89 free(a); |
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90 a = NULL; |
128 | 91 } |
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92 if (!PyErr_Occurred()) |
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93 PyErr_NoMemory(); |
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94 return NULL; |
72 | 95 } |
96 | |
97 static void lfree(struct flist *a) | |
98 { | |
128 | 99 if (a) { |
100 free(a->base); | |
101 free(a); | |
102 } | |
72 | 103 } |
104 | |
105 static int lsize(struct flist *a) | |
106 { | |
107 return a->tail - a->head; | |
108 } | |
109 | |
110 /* move hunks in source that are less cut to dest, compensating | |
111 for changes in offset. the last hunk may be split if necessary. | |
112 */ | |
113 static int gather(struct flist *dest, struct flist *src, int cut, int offset) | |
114 { | |
115 struct frag *d = dest->tail, *s = src->head; | |
116 int postend, c, l; | |
117 | |
118 while (s != src->tail) { | |
119 if (s->start + offset >= cut) | |
82 | 120 break; /* we've gone far enough */ |
72 | 121 |
122 postend = offset + s->start + s->len; | |
123 if (postend <= cut) { | |
124 /* save this hunk */ | |
125 offset += s->start + s->len - s->end; | |
126 *d++ = *s++; | |
127 } | |
128 else { | |
129 /* break up this hunk */ | |
130 c = cut - offset; | |
131 if (s->end < c) | |
132 c = s->end; | |
133 l = cut - offset - s->start; | |
134 if (s->len < l) | |
135 l = s->len; | |
136 | |
137 offset += s->start + l - c; | |
138 | |
139 d->start = s->start; | |
140 d->end = c; | |
141 d->len = l; | |
142 d->data = s->data; | |
143 d++; | |
144 s->start = c; | |
145 s->len = s->len - l; | |
146 s->data = s->data + l; | |
147 | |
82 | 148 break; |
72 | 149 } |
150 } | |
151 | |
152 dest->tail = d; | |
153 src->head = s; | |
154 return offset; | |
155 } | |
156 | |
157 /* like gather, but with no output list */ | |
158 static int discard(struct flist *src, int cut, int offset) | |
159 { | |
160 struct frag *s = src->head; | |
161 int postend, c, l; | |
162 | |
163 while (s != src->tail) { | |
164 if (s->start + offset >= cut) | |
82 | 165 break; |
72 | 166 |
167 postend = offset + s->start + s->len; | |
168 if (postend <= cut) { | |
169 offset += s->start + s->len - s->end; | |
170 s++; | |
171 } | |
172 else { | |
173 c = cut - offset; | |
174 if (s->end < c) | |
175 c = s->end; | |
176 l = cut - offset - s->start; | |
177 if (s->len < l) | |
178 l = s->len; | |
179 | |
180 offset += s->start + l - c; | |
181 s->start = c; | |
182 s->len = s->len - l; | |
183 s->data = s->data + l; | |
184 | |
82 | 185 break; |
72 | 186 } |
187 } | |
188 | |
189 src->head = s; | |
190 return offset; | |
191 } | |
192 | |
193 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
194 this deletes a and b and returns the resultant list. */ | |
195 static struct flist *combine(struct flist *a, struct flist *b) | |
196 { | |
128 | 197 struct flist *c = NULL; |
198 struct frag *bh, *ct; | |
72 | 199 int offset = 0, post; |
200 | |
128 | 201 if (a && b) |
202 c = lalloc((lsize(a) + lsize(b)) * 2); | |
203 | |
204 if (c) { | |
72 | 205 |
128 | 206 for (bh = b->head; bh != b->tail; bh++) { |
207 /* save old hunks */ | |
208 offset = gather(c, a, bh->start, offset); | |
72 | 209 |
128 | 210 /* discard replaced hunks */ |
211 post = discard(a, bh->end, offset); | |
72 | 212 |
128 | 213 /* insert new hunk */ |
214 ct = c->tail; | |
215 ct->start = bh->start - offset; | |
216 ct->end = bh->end - post; | |
217 ct->len = bh->len; | |
218 ct->data = bh->data; | |
219 c->tail++; | |
220 offset = post; | |
221 } | |
222 | |
223 /* hold on to tail from a */ | |
224 memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); | |
225 c->tail += lsize(a); | |
72 | 226 } |
227 | |
228 lfree(a); | |
229 lfree(b); | |
230 return c; | |
231 } | |
232 | |
233 /* decode a binary patch into a hunk list */ | |
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234 static struct flist *decode(const char *bin, int len) |
72 | 235 { |
236 struct flist *l; | |
237 struct frag *lt; | |
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238 const char *data = bin + 12, *end = bin + len; |
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239 char decode[12]; /* for dealing with alignment issues */ |
72 | 240 |
241 /* assume worst case size, we won't have many of these lists */ | |
242 l = lalloc(len / 12); | |
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243 if (!l) |
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244 return NULL; |
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245 |
72 | 246 lt = l->tail; |
247 | |
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248 while (data <= end) { |
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249 memcpy(decode, bin, 12); |
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250 lt->start = ntohl(*(uint32_t *)decode); |
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251 lt->end = ntohl(*(uint32_t *)(decode + 4)); |
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252 lt->len = ntohl(*(uint32_t *)(decode + 8)); |
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253 if (lt->start > lt->end) |
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254 break; /* sanity check */ |
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255 bin = data + lt->len; |
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256 if (bin < data) |
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257 break; /* big data + big (bogus) len can wrap around */ |
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258 lt->data = data; |
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259 data = bin + 12; |
72 | 260 lt++; |
261 } | |
262 | |
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263 if (bin != end) { |
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264 if (!PyErr_Occurred()) |
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265 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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266 lfree(l); |
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267 return NULL; |
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268 } |
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269 |
72 | 270 l->tail = lt; |
271 return l; | |
272 } | |
273 | |
274 /* calculate the size of resultant text */ | |
275 static int calcsize(int len, struct flist *l) | |
276 { | |
277 int outlen = 0, last = 0; | |
278 struct frag *f = l->head; | |
279 | |
280 while (f != l->tail) { | |
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281 if (f->start < last || f->end > len) { |
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282 if (!PyErr_Occurred()) |
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283 PyErr_SetString(mpatch_Error, |
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284 "invalid patch"); |
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285 return -1; |
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286 } |
72 | 287 outlen += f->start - last; |
288 last = f->end; | |
289 outlen += f->len; | |
290 f++; | |
291 } | |
292 | |
293 outlen += len - last; | |
294 return outlen; | |
295 } | |
296 | |
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297 static int apply(char *buf, const char *orig, int len, struct flist *l) |
72 | 298 { |
299 struct frag *f = l->head; | |
300 int last = 0; | |
301 char *p = buf; | |
302 | |
303 while (f != l->tail) { | |
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304 if (f->start < last || f->end > len) { |
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305 if (!PyErr_Occurred()) |
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306 PyErr_SetString(mpatch_Error, |
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307 "invalid patch"); |
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308 return 0; |
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309 } |
72 | 310 memcpy(p, orig + last, f->start - last); |
311 p += f->start - last; | |
312 memcpy(p, f->data, f->len); | |
313 last = f->end; | |
314 p += f->len; | |
315 f++; | |
316 } | |
317 memcpy(p, orig + last, len - last); | |
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318 return 1; |
72 | 319 } |
320 | |
321 /* recursively generate a patch of all bins between start and end */ | |
322 static struct flist *fold(PyObject *bins, int start, int end) | |
323 { | |
324 int len; | |
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325 Py_ssize_t blen; |
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326 const char *buffer; |
72 | 327 |
328 if (start + 1 == end) { | |
329 /* trivial case, output a decoded list */ | |
330 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 331 if (!tmp) |
332 return NULL; | |
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333 if (PyObject_AsCharBuffer(tmp, &buffer, &blen)) |
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334 return NULL; |
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335 return decode(buffer, blen); |
72 | 336 } |
337 | |
338 /* divide and conquer, memory management is elsewhere */ | |
339 len = (end - start) / 2; | |
340 return combine(fold(bins, start, start + len), | |
341 fold(bins, start + len, end)); | |
342 } | |
343 | |
344 static PyObject * | |
345 patches(PyObject *self, PyObject *args) | |
346 { | |
347 PyObject *text, *bins, *result; | |
348 struct flist *patch; | |
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349 const char *in; |
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350 char *out; |
72 | 351 int len, outlen; |
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352 Py_ssize_t inlen; |
72 | 353 |
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354 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 355 return NULL; |
356 | |
357 len = PyList_Size(bins); | |
358 if (!len) { | |
359 /* nothing to do */ | |
360 Py_INCREF(text); | |
361 return text; | |
362 } | |
363 | |
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364 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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365 return NULL; |
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366 |
72 | 367 patch = fold(bins, 0, len); |
128 | 368 if (!patch) |
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369 return NULL; |
128 | 370 |
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371 outlen = calcsize(inlen, patch); |
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372 if (outlen < 0) { |
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373 result = NULL; |
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374 goto cleanup; |
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375 } |
72 | 376 result = PyString_FromStringAndSize(NULL, outlen); |
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377 if (!result) { |
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378 result = NULL; |
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379 goto cleanup; |
128 | 380 } |
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381 out = PyString_AsString(result); |
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382 if (!apply(out, in, inlen, patch)) { |
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383 Py_DECREF(result); |
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384 result = NULL; |
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385 } |
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386 cleanup: |
72 | 387 lfree(patch); |
388 return result; | |
389 } | |
390 | |
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391 /* calculate size of a patched file directly */ |
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392 static PyObject * |
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393 patchedsize(PyObject *self, PyObject *args) |
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394 { |
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395 long orig, start, end, len, outlen = 0, last = 0; |
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396 int patchlen; |
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397 char *bin, *binend, *data; |
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398 char decode[12]; /* for dealing with alignment issues */ |
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399 |
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400 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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401 return NULL; |
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402 |
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403 binend = bin + patchlen; |
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404 data = bin + 12; |
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405 |
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406 while (data <= binend) { |
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407 memcpy(decode, bin, 12); |
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408 start = ntohl(*(uint32_t *)decode); |
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409 end = ntohl(*(uint32_t *)(decode + 4)); |
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410 len = ntohl(*(uint32_t *)(decode + 8)); |
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411 if (start > end) |
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412 break; /* sanity check */ |
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413 bin = data + len; |
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414 if (bin < data) |
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415 break; /* big data + big (bogus) len can wrap around */ |
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416 data = bin + 12; |
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417 outlen += start - last; |
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418 last = end; |
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419 outlen += len; |
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420 } |
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421 |
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422 if (bin != binend) { |
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423 if (!PyErr_Occurred()) |
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424 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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425 return NULL; |
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426 } |
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427 |
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428 outlen += orig - last; |
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429 return Py_BuildValue("l", outlen); |
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430 } |
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431 |
72 | 432 static PyMethodDef methods[] = { |
433 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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434 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 435 {NULL, NULL} |
436 }; | |
437 | |
438 PyMODINIT_FUNC | |
439 initmpatch(void) | |
440 { | |
441 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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442 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 443 } |
444 |