Mercurial > hg
annotate mercurial/mpatch.c @ 17517:15036492a103
spelling: Structured
author | timeless@mozdev.org |
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date | Fri, 17 Aug 2012 13:58:19 -0700 |
parents | 9a8ab5c47f84 |
children | 09e41ac6289d |
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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 | |
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23 #define PY_SSIZE_T_CLEAN |
72 | 24 #include <Python.h> |
25 #include <stdlib.h> | |
26 #include <string.h> | |
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27 |
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28 #include "util.h" |
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29 |
72 | 30 static char mpatch_doc[] = "Efficient binary patching."; |
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31 static PyObject *mpatch_Error; |
72 | 32 |
33 struct frag { | |
34 int start, end, len; | |
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35 const char *data; |
72 | 36 }; |
37 | |
38 struct flist { | |
39 struct frag *base, *head, *tail; | |
40 }; | |
41 | |
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42 static struct flist *lalloc(Py_ssize_t size) |
72 | 43 { |
128 | 44 struct flist *a = NULL; |
72 | 45 |
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46 if (size < 1) |
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47 size = 1; |
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48 |
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49 a = (struct flist *)malloc(sizeof(struct flist)); |
128 | 50 if (a) { |
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51 a->base = (struct frag *)malloc(sizeof(struct frag) * size); |
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52 if (a->base) { |
128 | 53 a->head = a->tail = a->base; |
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54 return a; |
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55 } |
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56 free(a); |
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57 a = NULL; |
128 | 58 } |
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59 if (!PyErr_Occurred()) |
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60 PyErr_NoMemory(); |
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61 return NULL; |
72 | 62 } |
63 | |
64 static void lfree(struct flist *a) | |
65 { | |
128 | 66 if (a) { |
67 free(a->base); | |
68 free(a); | |
69 } | |
72 | 70 } |
71 | |
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72 static Py_ssize_t lsize(struct flist *a) |
72 | 73 { |
74 return a->tail - a->head; | |
75 } | |
76 | |
77 /* move hunks in source that are less cut to dest, compensating | |
78 for changes in offset. the last hunk may be split if necessary. | |
79 */ | |
80 static int gather(struct flist *dest, struct flist *src, int cut, int offset) | |
81 { | |
82 struct frag *d = dest->tail, *s = src->head; | |
83 int postend, c, l; | |
84 | |
85 while (s != src->tail) { | |
86 if (s->start + offset >= cut) | |
82 | 87 break; /* we've gone far enough */ |
72 | 88 |
89 postend = offset + s->start + s->len; | |
90 if (postend <= cut) { | |
91 /* save this hunk */ | |
92 offset += s->start + s->len - s->end; | |
93 *d++ = *s++; | |
94 } | |
95 else { | |
96 /* break up this hunk */ | |
97 c = cut - offset; | |
98 if (s->end < c) | |
99 c = s->end; | |
100 l = cut - offset - s->start; | |
101 if (s->len < l) | |
102 l = s->len; | |
103 | |
104 offset += s->start + l - c; | |
105 | |
106 d->start = s->start; | |
107 d->end = c; | |
108 d->len = l; | |
109 d->data = s->data; | |
110 d++; | |
111 s->start = c; | |
112 s->len = s->len - l; | |
113 s->data = s->data + l; | |
114 | |
82 | 115 break; |
72 | 116 } |
117 } | |
118 | |
119 dest->tail = d; | |
120 src->head = s; | |
121 return offset; | |
122 } | |
123 | |
124 /* like gather, but with no output list */ | |
125 static int discard(struct flist *src, int cut, int offset) | |
126 { | |
127 struct frag *s = src->head; | |
128 int postend, c, l; | |
129 | |
130 while (s != src->tail) { | |
131 if (s->start + offset >= cut) | |
82 | 132 break; |
72 | 133 |
134 postend = offset + s->start + s->len; | |
135 if (postend <= cut) { | |
136 offset += s->start + s->len - s->end; | |
137 s++; | |
138 } | |
139 else { | |
140 c = cut - offset; | |
141 if (s->end < c) | |
142 c = s->end; | |
143 l = cut - offset - s->start; | |
144 if (s->len < l) | |
145 l = s->len; | |
146 | |
147 offset += s->start + l - c; | |
148 s->start = c; | |
149 s->len = s->len - l; | |
150 s->data = s->data + l; | |
151 | |
82 | 152 break; |
72 | 153 } |
154 } | |
155 | |
156 src->head = s; | |
157 return offset; | |
158 } | |
159 | |
160 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
161 this deletes a and b and returns the resultant list. */ | |
162 static struct flist *combine(struct flist *a, struct flist *b) | |
163 { | |
128 | 164 struct flist *c = NULL; |
165 struct frag *bh, *ct; | |
72 | 166 int offset = 0, post; |
167 | |
128 | 168 if (a && b) |
169 c = lalloc((lsize(a) + lsize(b)) * 2); | |
170 | |
171 if (c) { | |
72 | 172 |
128 | 173 for (bh = b->head; bh != b->tail; bh++) { |
174 /* save old hunks */ | |
175 offset = gather(c, a, bh->start, offset); | |
72 | 176 |
128 | 177 /* discard replaced hunks */ |
178 post = discard(a, bh->end, offset); | |
72 | 179 |
128 | 180 /* insert new hunk */ |
181 ct = c->tail; | |
182 ct->start = bh->start - offset; | |
183 ct->end = bh->end - post; | |
184 ct->len = bh->len; | |
185 ct->data = bh->data; | |
186 c->tail++; | |
187 offset = post; | |
188 } | |
189 | |
190 /* hold on to tail from a */ | |
191 memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); | |
192 c->tail += lsize(a); | |
72 | 193 } |
194 | |
195 lfree(a); | |
196 lfree(b); | |
197 return c; | |
198 } | |
199 | |
200 /* decode a binary patch into a hunk list */ | |
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201 static struct flist *decode(const char *bin, Py_ssize_t len) |
72 | 202 { |
203 struct flist *l; | |
204 struct frag *lt; | |
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205 const char *data = bin + 12, *end = bin + len; |
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 lt->start = getbe32(bin); |
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216 lt->end = getbe32(bin + 4); |
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217 lt->len = getbe32(bin + 8); |
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218 if (lt->start > lt->end) |
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219 break; /* sanity check */ |
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220 bin = data + lt->len; |
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221 if (bin < data) |
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222 break; /* big data + big (bogus) len can wrap around */ |
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223 lt->data = data; |
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224 data = bin + 12; |
72 | 225 lt++; |
226 } | |
227 | |
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228 if (bin != end) { |
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229 if (!PyErr_Occurred()) |
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230 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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231 lfree(l); |
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232 return NULL; |
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233 } |
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234 |
72 | 235 l->tail = lt; |
236 return l; | |
237 } | |
238 | |
239 /* calculate the size of resultant text */ | |
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240 static Py_ssize_t calcsize(Py_ssize_t len, struct flist *l) |
72 | 241 { |
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242 Py_ssize_t outlen = 0, last = 0; |
72 | 243 struct frag *f = l->head; |
244 | |
245 while (f != l->tail) { | |
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246 if (f->start < last || f->end > len) { |
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247 if (!PyErr_Occurred()) |
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248 PyErr_SetString(mpatch_Error, |
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249 "invalid patch"); |
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250 return -1; |
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251 } |
72 | 252 outlen += f->start - last; |
253 last = f->end; | |
254 outlen += f->len; | |
255 f++; | |
256 } | |
257 | |
258 outlen += len - last; | |
259 return outlen; | |
260 } | |
261 | |
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262 static int apply(char *buf, const char *orig, Py_ssize_t len, struct flist *l) |
72 | 263 { |
264 struct frag *f = l->head; | |
265 int last = 0; | |
266 char *p = buf; | |
267 | |
268 while (f != l->tail) { | |
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269 if (f->start < last || f->end > len) { |
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270 if (!PyErr_Occurred()) |
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271 PyErr_SetString(mpatch_Error, |
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272 "invalid patch"); |
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273 return 0; |
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274 } |
72 | 275 memcpy(p, orig + last, f->start - last); |
276 p += f->start - last; | |
277 memcpy(p, f->data, f->len); | |
278 last = f->end; | |
279 p += f->len; | |
280 f++; | |
281 } | |
282 memcpy(p, orig + last, len - last); | |
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283 return 1; |
72 | 284 } |
285 | |
286 /* recursively generate a patch of all bins between start and end */ | |
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287 static struct flist *fold(PyObject *bins, Py_ssize_t start, Py_ssize_t end) |
72 | 288 { |
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289 Py_ssize_t len, blen; |
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290 const char *buffer; |
72 | 291 |
292 if (start + 1 == end) { | |
293 /* trivial case, output a decoded list */ | |
294 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 295 if (!tmp) |
296 return NULL; | |
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297 if (PyObject_AsCharBuffer(tmp, &buffer, &blen)) |
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298 return NULL; |
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299 return decode(buffer, blen); |
72 | 300 } |
301 | |
302 /* divide and conquer, memory management is elsewhere */ | |
303 len = (end - start) / 2; | |
304 return combine(fold(bins, start, start + len), | |
305 fold(bins, start + len, end)); | |
306 } | |
307 | |
308 static PyObject * | |
309 patches(PyObject *self, PyObject *args) | |
310 { | |
311 PyObject *text, *bins, *result; | |
312 struct flist *patch; | |
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313 const char *in; |
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314 char *out; |
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315 Py_ssize_t len, outlen, inlen; |
72 | 316 |
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317 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 318 return NULL; |
319 | |
320 len = PyList_Size(bins); | |
321 if (!len) { | |
322 /* nothing to do */ | |
323 Py_INCREF(text); | |
324 return text; | |
325 } | |
326 | |
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327 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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328 return NULL; |
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329 |
72 | 330 patch = fold(bins, 0, len); |
128 | 331 if (!patch) |
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332 return NULL; |
128 | 333 |
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334 outlen = calcsize(inlen, patch); |
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335 if (outlen < 0) { |
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336 result = NULL; |
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337 goto cleanup; |
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338 } |
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339 result = PyBytes_FromStringAndSize(NULL, outlen); |
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340 if (!result) { |
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341 result = NULL; |
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342 goto cleanup; |
128 | 343 } |
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344 out = PyBytes_AsString(result); |
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345 if (!apply(out, in, inlen, patch)) { |
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346 Py_DECREF(result); |
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347 result = NULL; |
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348 } |
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349 cleanup: |
72 | 350 lfree(patch); |
351 return result; | |
352 } | |
353 | |
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354 /* calculate size of a patched file directly */ |
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355 static PyObject * |
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356 patchedsize(PyObject *self, PyObject *args) |
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357 { |
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358 long orig, start, end, len, outlen = 0, last = 0; |
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359 Py_ssize_t patchlen; |
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360 char *bin, *binend, *data; |
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361 |
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362 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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363 return NULL; |
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364 |
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365 binend = bin + patchlen; |
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366 data = bin + 12; |
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367 |
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368 while (data <= binend) { |
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369 start = getbe32(bin); |
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370 end = getbe32(bin + 4); |
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371 len = getbe32(bin + 8); |
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372 if (start > end) |
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373 break; /* sanity check */ |
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374 bin = data + len; |
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375 if (bin < data) |
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376 break; /* big data + big (bogus) len can wrap around */ |
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377 data = bin + 12; |
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378 outlen += start - last; |
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379 last = end; |
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380 outlen += len; |
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381 } |
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382 |
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383 if (bin != binend) { |
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384 if (!PyErr_Occurred()) |
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385 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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386 return NULL; |
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387 } |
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388 |
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389 outlen += orig - last; |
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390 return Py_BuildValue("l", outlen); |
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391 } |
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392 |
72 | 393 static PyMethodDef methods[] = { |
394 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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395 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 396 {NULL, NULL} |
397 }; | |
398 | |
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399 #ifdef IS_PY3K |
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400 static struct PyModuleDef mpatch_module = { |
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401 PyModuleDef_HEAD_INIT, |
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402 "mpatch", |
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403 mpatch_doc, |
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404 -1, |
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405 methods |
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406 }; |
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407 |
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408 PyMODINIT_FUNC PyInit_mpatch(void) |
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409 { |
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410 PyObject *m; |
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411 |
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412 m = PyModule_Create(&mpatch_module); |
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413 if (m == NULL) |
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414 return NULL; |
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415 |
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416 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
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417 Py_INCREF(mpatch_Error); |
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418 PyModule_AddObject(m, "mpatchError", mpatch_Error); |
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419 |
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420 return m; |
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421 } |
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422 #else |
72 | 423 PyMODINIT_FUNC |
424 initmpatch(void) | |
425 { | |
426 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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427 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 428 } |
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429 #endif |