Mercurial > hg
annotate mercurial/mpatch.c @ 45237:39f4ec4039a8
commitctx: move a special case about files earlier
Same logic as a changeset a bit earlier, the `writefilecopymeta` section is more
a post processing details so we move the conditional about `files` value closer
to the rest of the code computing `files` value.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Thu, 23 Jul 2020 23:40:59 +0200 |
parents | 763b45bc4483 |
children | d4ba4d51f85f |
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 | |
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23 #include <limits.h> |
72 | 24 #include <stdlib.h> |
25 #include <string.h> | |
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26 |
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27 #include "bitmanipulation.h" |
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28 #include "compat.h" |
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29 #include "mpatch.h" |
72 | 30 |
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31 /* VC9 doesn't include bool and lacks stdbool.h based on cext/util.h */ |
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32 #if defined(_MSC_VER) || __STDC_VERSION__ < 199901L |
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33 #define true 1 |
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34 #define false 0 |
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35 typedef unsigned char bool; |
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36 #else |
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37 #include <stdbool.h> |
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38 #endif |
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39 |
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40 static struct mpatch_flist *lalloc(ssize_t size) |
72 | 41 { |
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42 struct mpatch_flist *a = NULL; |
72 | 43 |
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44 if (size < 1) { |
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45 size = 1; |
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46 } |
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47 |
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48 a = (struct mpatch_flist *)malloc(sizeof(struct mpatch_flist)); |
128 | 49 if (a) { |
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50 a->base = (struct mpatch_frag *)malloc( |
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51 sizeof(struct mpatch_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); |
128 | 57 } |
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58 return NULL; |
72 | 59 } |
60 | |
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61 void mpatch_lfree(struct mpatch_flist *a) |
72 | 62 { |
128 | 63 if (a) { |
64 free(a->base); | |
65 free(a); | |
66 } | |
72 | 67 } |
68 | |
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69 static ssize_t lsize(struct mpatch_flist *a) |
72 | 70 { |
71 return a->tail - a->head; | |
72 } | |
73 | |
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74 /* add helper to add src and *dest iff it won't overflow */ |
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75 static inline bool safeadd(int src, int *dest) |
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76 { |
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77 if ((src > 0) == (*dest > 0)) { |
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78 if (*dest > 0) { |
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79 if (src > (INT_MAX - *dest)) { |
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80 return false; |
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81 } |
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82 } else { |
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83 if (src < (INT_MIN - *dest)) { |
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84 return false; |
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85 } |
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86 } |
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87 } |
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88 *dest += src; |
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89 return true; |
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90 } |
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91 |
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92 /* subtract src from dest and store result in dest */ |
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93 static inline bool safesub(int src, int *dest) |
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94 { |
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95 if (((src > 0) && (*dest < INT_MIN + src)) || |
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96 ((src < 0) && (*dest > INT_MAX + src))) { |
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97 return false; |
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98 } |
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99 *dest -= src; |
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100 return true; |
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101 } |
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102 |
72 | 103 /* move hunks in source that are less cut to dest, compensating |
104 for changes in offset. the last hunk may be split if necessary. | |
105 */ | |
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106 static int gather(struct mpatch_flist *dest, struct mpatch_flist *src, int cut, |
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107 int offset) |
72 | 108 { |
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109 struct mpatch_frag *d = dest->tail, *s = src->head; |
72 | 110 int postend, c, l; |
111 | |
112 while (s != src->tail) { | |
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113 int soffset = s->start; |
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114 if (!safeadd(offset, &soffset)) { |
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115 break; /* add would overflow, oh well */ |
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116 } |
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117 if (soffset >= cut) { |
82 | 118 break; /* we've gone far enough */ |
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119 } |
72 | 120 |
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121 postend = offset; |
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122 if (!safeadd(s->start, &postend) || |
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123 !safeadd(s->len, &postend)) { |
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124 break; |
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125 } |
72 | 126 if (postend <= cut) { |
127 /* save this hunk */ | |
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128 int tmp = s->start; |
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129 if (!safesub(s->end, &tmp)) { |
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130 break; |
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131 } |
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132 if (!safeadd(s->len, &tmp)) { |
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133 break; |
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134 } |
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135 if (!safeadd(tmp, &offset)) { |
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136 break; /* add would overflow, oh well */ |
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137 } |
72 | 138 *d++ = *s++; |
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139 } else { |
72 | 140 /* break up this hunk */ |
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141 c = cut; |
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142 if (!safesub(offset, &c)) { |
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143 break; |
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144 } |
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145 if (s->end < c) { |
72 | 146 c = s->end; |
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147 } |
72 | 148 l = cut - offset - s->start; |
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149 if (s->len < l) { |
72 | 150 l = s->len; |
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151 } |
72 | 152 |
153 offset += s->start + l - c; | |
154 | |
155 d->start = s->start; | |
156 d->end = c; | |
157 d->len = l; | |
158 d->data = s->data; | |
159 d++; | |
160 s->start = c; | |
161 s->len = s->len - l; | |
162 s->data = s->data + l; | |
163 | |
82 | 164 break; |
72 | 165 } |
166 } | |
167 | |
168 dest->tail = d; | |
169 src->head = s; | |
170 return offset; | |
171 } | |
172 | |
173 /* like gather, but with no output list */ | |
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174 static int discard(struct mpatch_flist *src, int cut, int offset) |
72 | 175 { |
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176 struct mpatch_frag *s = src->head; |
72 | 177 int postend, c, l; |
178 | |
179 while (s != src->tail) { | |
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180 int cmpcut = s->start; |
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181 if (!safeadd(offset, &cmpcut)) { |
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182 break; |
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183 } |
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184 if (cmpcut >= cut) { |
82 | 185 break; |
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186 } |
72 | 187 |
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188 postend = offset; |
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189 if (!safeadd(s->start, &postend)) { |
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190 break; |
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191 } |
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192 if (!safeadd(s->len, &postend)) { |
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193 break; |
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194 } |
72 | 195 if (postend <= cut) { |
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196 /* do the subtraction first to avoid UB integer overflow |
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197 */ |
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198 int tmp = s->start; |
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199 if (!safesub(s->end, &tmp)) { |
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200 break; |
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201 } |
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202 if (!safeadd(s->len, &tmp)) { |
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203 break; |
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204 } |
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205 if (!safeadd(tmp, &offset)) { |
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206 break; |
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207 } |
72 | 208 s++; |
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209 } else { |
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210 c = cut; |
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211 if (!safesub(offset, &c)) { |
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212 break; |
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213 } |
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214 if (s->end < c) { |
72 | 215 c = s->end; |
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216 } |
72 | 217 l = cut - offset - s->start; |
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218 if (s->len < l) { |
72 | 219 l = s->len; |
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220 } |
72 | 221 |
222 offset += s->start + l - c; | |
223 s->start = c; | |
224 s->len = s->len - l; | |
225 s->data = s->data + l; | |
226 | |
82 | 227 break; |
72 | 228 } |
229 } | |
230 | |
231 src->head = s; | |
232 return offset; | |
233 } | |
234 | |
235 /* combine hunk lists a and b, while adjusting b for offset changes in a/ | |
236 this deletes a and b and returns the resultant list. */ | |
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237 static struct mpatch_flist *combine(struct mpatch_flist *a, |
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238 struct mpatch_flist *b) |
72 | 239 { |
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240 struct mpatch_flist *c = NULL; |
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241 struct mpatch_frag *bh, *ct; |
72 | 242 int offset = 0, post; |
243 | |
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244 if (a && b) { |
128 | 245 c = lalloc((lsize(a) + lsize(b)) * 2); |
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246 } |
128 | 247 |
248 if (c) { | |
72 | 249 |
128 | 250 for (bh = b->head; bh != b->tail; bh++) { |
251 /* save old hunks */ | |
252 offset = gather(c, a, bh->start, offset); | |
72 | 253 |
128 | 254 /* discard replaced hunks */ |
255 post = discard(a, bh->end, offset); | |
72 | 256 |
128 | 257 /* insert new hunk */ |
258 ct = c->tail; | |
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259 ct->start = bh->start; |
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260 ct->end = bh->end; |
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261 if (!safesub(offset, &(ct->start)) || |
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262 !safesub(post, &(ct->end))) { |
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263 /* It was already possible to exit |
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264 * this function with a return value |
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265 * of NULL before the safesub()s were |
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266 * added, so this should be fine. */ |
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267 mpatch_lfree(c); |
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268 c = NULL; |
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269 goto done; |
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270 } |
128 | 271 ct->len = bh->len; |
272 ct->data = bh->data; | |
273 c->tail++; | |
274 offset = post; | |
275 } | |
276 | |
277 /* hold on to tail from a */ | |
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278 memcpy(c->tail, a->head, sizeof(struct mpatch_frag) * lsize(a)); |
128 | 279 c->tail += lsize(a); |
72 | 280 } |
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281 done: |
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282 mpatch_lfree(a); |
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283 mpatch_lfree(b); |
72 | 284 return c; |
285 } | |
286 | |
287 /* decode a binary patch into a hunk list */ | |
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288 int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res) |
72 | 289 { |
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290 struct mpatch_flist *l; |
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291 struct mpatch_frag *lt; |
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292 int pos = 0; |
72 | 293 |
294 /* assume worst case size, we won't have many of these lists */ | |
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295 l = lalloc(len / 12 + 1); |
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296 if (!l) { |
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297 return MPATCH_ERR_NO_MEM; |
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298 } |
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299 |
72 | 300 lt = l->tail; |
301 | |
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302 /* We check against len-11 to ensure we have at least 12 bytes |
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303 left in the patch so we can read our three be32s out of it. */ |
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304 while (pos >= 0 && pos < (len - 11)) { |
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305 lt->start = getbe32(bin + pos); |
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306 lt->end = getbe32(bin + pos + 4); |
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307 lt->len = getbe32(bin + pos + 8); |
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308 if (lt->start < 0 || lt->start > lt->end || lt->len < 0) { |
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309 break; /* sanity check */ |
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310 } |
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311 if (!safeadd(12, &pos)) { |
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312 break; |
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313 } |
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314 lt->data = bin + pos; |
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315 if (!safeadd(lt->len, &pos)) { |
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316 break; |
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317 } |
72 | 318 lt++; |
319 } | |
320 | |
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321 if (pos != len) { |
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322 mpatch_lfree(l); |
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323 return MPATCH_ERR_CANNOT_BE_DECODED; |
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324 } |
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325 |
72 | 326 l->tail = lt; |
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327 *res = l; |
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328 return 0; |
72 | 329 } |
330 | |
331 /* calculate the size of resultant text */ | |
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332 ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l) |
72 | 333 { |
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334 ssize_t outlen = 0, last = 0; |
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335 struct mpatch_frag *f = l->head; |
72 | 336 |
337 while (f != l->tail) { | |
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338 if (f->start < last || f->end > len) { |
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339 return MPATCH_ERR_INVALID_PATCH; |
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340 } |
72 | 341 outlen += f->start - last; |
342 last = f->end; | |
343 outlen += f->len; | |
344 f++; | |
345 } | |
346 | |
347 outlen += len - last; | |
348 return outlen; | |
349 } | |
350 | |
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351 int mpatch_apply(char *buf, const char *orig, ssize_t len, |
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352 struct mpatch_flist *l) |
72 | 353 { |
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354 struct mpatch_frag *f = l->head; |
72 | 355 int last = 0; |
356 char *p = buf; | |
357 | |
358 while (f != l->tail) { | |
38189
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359 if (f->start < last || f->start > len || f->end > len || |
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360 last < 0) { |
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361 return MPATCH_ERR_INVALID_PATCH; |
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362 } |
72 | 363 memcpy(p, orig + last, f->start - last); |
364 p += f->start - last; | |
365 memcpy(p, f->data, f->len); | |
366 last = f->end; | |
367 p += f->len; | |
368 f++; | |
369 } | |
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370 if (last < 0) { |
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371 return MPATCH_ERR_INVALID_PATCH; |
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372 } |
72 | 373 memcpy(p, orig + last, len - last); |
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374 return 0; |
72 | 375 } |
376 | |
377 /* recursively generate a patch of all bins between start and end */ | |
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378 struct mpatch_flist * |
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379 mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t), |
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380 ssize_t start, ssize_t end) |
72 | 381 { |
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382 ssize_t len; |
72 | 383 |
384 if (start + 1 == end) { | |
385 /* trivial case, output a decoded list */ | |
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386 return get_next_item(bins, start); |
72 | 387 } |
388 | |
389 /* divide and conquer, memory management is elsewhere */ | |
390 len = (end - start) / 2; | |
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391 return combine(mpatch_fold(bins, get_next_item, start, start + len), |
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392 mpatch_fold(bins, get_next_item, start + len, end)); |
72 | 393 } |