Mercurial > hg
annotate mercurial/mpatch.c @ 28749:2fa5c7c1df8c
py3: use absolute_import in test-hybridencode.py
author | Robert Stanca <robert.stanca7@gmail.com> |
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date | Mon, 04 Apr 2016 01:33:08 +0300 |
parents | b9714d958e89 |
children | f736f98e16ca |
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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 int pos = 0; |
72 | 206 |
207 /* assume worst case size, we won't have many of these lists */ | |
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208 l = lalloc(len / 12 + 1); |
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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 (pos >= 0 && pos < len) { |
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215 lt->start = getbe32(bin + pos); |
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216 lt->end = getbe32(bin + pos + 4); |
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217 lt->len = getbe32(bin + pos + 8); |
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218 lt->data = bin + pos + 12; |
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219 pos += 12 + lt->len; |
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220 if (lt->start > lt->end || lt->len < 0) |
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221 break; /* sanity check */ |
72 | 222 lt++; |
223 } | |
224 | |
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225 if (pos != len) { |
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226 if (!PyErr_Occurred()) |
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227 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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228 lfree(l); |
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229 return NULL; |
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230 } |
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231 |
72 | 232 l->tail = lt; |
233 return l; | |
234 } | |
235 | |
236 /* calculate the size of resultant text */ | |
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237 static Py_ssize_t calcsize(Py_ssize_t len, struct flist *l) |
72 | 238 { |
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239 Py_ssize_t outlen = 0, last = 0; |
72 | 240 struct frag *f = l->head; |
241 | |
242 while (f != l->tail) { | |
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243 if (f->start < last || f->end > len) { |
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244 if (!PyErr_Occurred()) |
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245 PyErr_SetString(mpatch_Error, |
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246 "invalid patch"); |
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247 return -1; |
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248 } |
72 | 249 outlen += f->start - last; |
250 last = f->end; | |
251 outlen += f->len; | |
252 f++; | |
253 } | |
254 | |
255 outlen += len - last; | |
256 return outlen; | |
257 } | |
258 | |
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259 static int apply(char *buf, const char *orig, Py_ssize_t len, struct flist *l) |
72 | 260 { |
261 struct frag *f = l->head; | |
262 int last = 0; | |
263 char *p = buf; | |
264 | |
265 while (f != l->tail) { | |
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266 if (f->start < last || f->end > len) { |
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267 if (!PyErr_Occurred()) |
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268 PyErr_SetString(mpatch_Error, |
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269 "invalid patch"); |
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270 return 0; |
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271 } |
72 | 272 memcpy(p, orig + last, f->start - last); |
273 p += f->start - last; | |
274 memcpy(p, f->data, f->len); | |
275 last = f->end; | |
276 p += f->len; | |
277 f++; | |
278 } | |
279 memcpy(p, orig + last, len - last); | |
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280 return 1; |
72 | 281 } |
282 | |
283 /* recursively generate a patch of all bins between start and end */ | |
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284 static struct flist *fold(PyObject *bins, Py_ssize_t start, Py_ssize_t end) |
72 | 285 { |
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286 Py_ssize_t len, blen; |
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287 const char *buffer; |
72 | 288 |
289 if (start + 1 == end) { | |
290 /* trivial case, output a decoded list */ | |
291 PyObject *tmp = PyList_GetItem(bins, start); | |
128 | 292 if (!tmp) |
293 return NULL; | |
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294 if (PyObject_AsCharBuffer(tmp, &buffer, &blen)) |
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295 return NULL; |
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296 return decode(buffer, blen); |
72 | 297 } |
298 | |
299 /* divide and conquer, memory management is elsewhere */ | |
300 len = (end - start) / 2; | |
301 return combine(fold(bins, start, start + len), | |
302 fold(bins, start + len, end)); | |
303 } | |
304 | |
305 static PyObject * | |
306 patches(PyObject *self, PyObject *args) | |
307 { | |
308 PyObject *text, *bins, *result; | |
309 struct flist *patch; | |
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310 const char *in; |
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311 char *out; |
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312 Py_ssize_t len, outlen, inlen; |
72 | 313 |
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314 if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins)) |
72 | 315 return NULL; |
316 | |
317 len = PyList_Size(bins); | |
318 if (!len) { | |
319 /* nothing to do */ | |
320 Py_INCREF(text); | |
321 return text; | |
322 } | |
323 | |
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324 if (PyObject_AsCharBuffer(text, &in, &inlen)) |
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325 return NULL; |
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326 |
72 | 327 patch = fold(bins, 0, len); |
128 | 328 if (!patch) |
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329 return NULL; |
128 | 330 |
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331 outlen = calcsize(inlen, patch); |
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332 if (outlen < 0) { |
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333 result = NULL; |
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334 goto cleanup; |
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335 } |
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336 result = PyBytes_FromStringAndSize(NULL, outlen); |
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337 if (!result) { |
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338 result = NULL; |
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339 goto cleanup; |
128 | 340 } |
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341 out = PyBytes_AsString(result); |
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342 if (!apply(out, in, inlen, patch)) { |
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343 Py_DECREF(result); |
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344 result = NULL; |
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345 } |
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346 cleanup: |
72 | 347 lfree(patch); |
348 return result; | |
349 } | |
350 | |
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351 /* calculate size of a patched file directly */ |
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352 static PyObject * |
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353 patchedsize(PyObject *self, PyObject *args) |
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354 { |
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355 long orig, start, end, len, outlen = 0, last = 0, pos = 0; |
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356 Py_ssize_t patchlen; |
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357 char *bin; |
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358 |
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359 if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
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360 return NULL; |
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361 |
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362 while (pos >= 0 && pos < patchlen) { |
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363 start = getbe32(bin + pos); |
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364 end = getbe32(bin + pos + 4); |
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365 len = getbe32(bin + pos + 8); |
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366 if (start > end) |
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367 break; /* sanity check */ |
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368 pos += 12 + len; |
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369 outlen += start - last; |
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370 last = end; |
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371 outlen += len; |
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372 } |
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373 |
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374 if (pos != patchlen) { |
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375 if (!PyErr_Occurred()) |
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376 PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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377 return NULL; |
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378 } |
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379 |
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380 outlen += orig - last; |
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381 return Py_BuildValue("l", outlen); |
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382 } |
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383 |
72 | 384 static PyMethodDef methods[] = { |
385 {"patches", patches, METH_VARARGS, "apply a series of patches\n"}, | |
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386 {"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 387 {NULL, NULL} |
388 }; | |
389 | |
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390 #ifdef IS_PY3K |
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391 static struct PyModuleDef mpatch_module = { |
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392 PyModuleDef_HEAD_INIT, |
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393 "mpatch", |
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394 mpatch_doc, |
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395 -1, |
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396 methods |
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397 }; |
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398 |
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399 PyMODINIT_FUNC PyInit_mpatch(void) |
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400 { |
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401 PyObject *m; |
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402 |
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403 m = PyModule_Create(&mpatch_module); |
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404 if (m == NULL) |
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405 return NULL; |
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406 |
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407 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
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408 Py_INCREF(mpatch_Error); |
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409 PyModule_AddObject(m, "mpatchError", mpatch_Error); |
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410 |
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411 return m; |
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412 } |
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413 #else |
72 | 414 PyMODINIT_FUNC |
415 initmpatch(void) | |
416 { | |
417 Py_InitModule3("mpatch", methods, mpatch_doc); | |
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418 mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 419 } |
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420 #endif |