Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bdiff.c @ 595:c2c2c6d617bd
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author | mpm@selenic.com |
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date | Sun, 03 Jul 2005 11:41:43 -0800 |
parents | f2442a6a5893 |
children | e530637ea060 |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
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4 Copyright 2005 Matt Mackall <mpm@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 |
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9 Based roughly on Python difflib |
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10 */ |
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11 |
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12 #include <Python.h> |
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13 #include <stdlib.h> |
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14 #include <string.h> |
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15 #ifdef _WIN32 |
551 | 16 #ifdef _MSC_VER |
17 #define inline __inline | |
18 typedef unsigned long uint32_t; | |
19 #else | |
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20 #include <stdint.h> |
551 | 21 #endif |
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22 static uint32_t htonl(uint32_t x) |
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23 { |
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24 return ((x & 0x000000ffUL) << 24) | |
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25 ((x & 0x0000ff00UL) << 8) | |
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26 ((x & 0x00ff0000UL) >> 8) | |
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27 ((x & 0xff000000UL) >> 24); |
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28 } |
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29 #else |
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30 #include <sys/types.h> |
472 | 31 #include <netinet/in.h> |
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32 #endif |
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33 |
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34 struct line { |
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35 int h, len, n, e; |
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36 const char *l; |
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37 }; |
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38 |
474 | 39 struct pos { |
40 int pos, len; | |
41 }; | |
42 | |
400
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43 struct hunk { |
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44 int a1, a2, b1, b2; |
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45 }; |
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46 |
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47 struct hunklist { |
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48 struct hunk *base, *head; |
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49 }; |
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50 |
439 | 51 static __inline uint32_t rol32(uint32_t word, unsigned int shift) |
400
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52 { |
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53 return (word << shift) | (word >> (32 - shift)); |
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54 } |
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55 |
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56 int splitlines(const char *a, int len, struct line **lr) |
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57 { |
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58 int h, i; |
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59 const char *p, *b = a; |
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60 struct line *l; |
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61 |
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62 /* count the lines */ |
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63 i = 1; /* extra line for sentinel */ |
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64 for (p = a; p < a + len; p++) |
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65 if (*p == '\n' || p == a + len - 1) |
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66 i++; |
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67 |
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68 *lr = l = malloc(sizeof(struct line) * i); |
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69 if (!l) |
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70 return -1; |
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71 |
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72 /* build the line array and calculate hashes */ |
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73 h = 0; |
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74 for (p = a; p < a + len; p++) { |
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75 h = *p + rol32(h, 7); /* a simple hash from GNU diff */ |
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76 if (*p == '\n' || p == a + len - 1) { |
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77 l->len = p - b + 1; |
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78 l->h = h * l->len; |
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79 l->l = b; |
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80 l->n = -1; |
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81 l++; |
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82 b = p + 1; |
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83 h = 0; |
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84 } |
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85 } |
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86 |
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87 /* set up a sentinel */ |
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88 l->h = l->len = 0; |
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89 l->l = a + len; |
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90 return i - 1; |
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91 } |
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92 |
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93 int inline cmp(struct line *a, struct line *b) |
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94 { |
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95 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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96 } |
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97 |
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98 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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99 { |
474 | 100 int i, j, buckets = 1, t; |
101 struct pos *h; | |
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102 |
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103 /* build a hash table of the next highest power of 2 */ |
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104 while (buckets < bn + 1) |
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105 buckets *= 2; |
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106 |
474 | 107 h = malloc(buckets * sizeof(struct pos)); |
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108 buckets = buckets - 1; |
474 | 109 if (!h) |
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110 return 0; |
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111 |
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112 /* clear the hash table */ |
474 | 113 for (i = 0; i <= buckets; i++) { |
114 h[i].pos = -1; | |
115 h[i].len = 0; | |
116 } | |
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117 |
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118 /* add lines to the hash table chains */ |
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119 for (i = bn - 1; i >= 0; i--) { |
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120 /* find the equivalence class */ |
474 | 121 for (j = b[i].h & buckets; h[j].pos != -1; |
122 j = (j + 1) & buckets) | |
123 if (!cmp(b + i, b + h[j].pos)) | |
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124 break; |
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125 |
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126 /* add to the head of the equivalence class */ |
474 | 127 b[i].n = h[j].pos; |
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128 b[i].e = j; |
474 | 129 h[j].pos = i; |
130 h[j].len++; /* keep track of popularity */ | |
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131 } |
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132 |
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133 /* compute popularity threshold */ |
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134 t = (bn >= 200) ? bn / 100 : bn + 1; |
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135 |
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136 /* match items in a to their equivalence class in b */ |
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137 for (i = 0; i < an; i++) { |
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138 /* find the equivalence class */ |
474 | 139 for (j = a[i].h & buckets; h[j].pos != -1; |
140 j = (j + 1) & buckets) | |
141 if (!cmp(a + i, b + h[j].pos)) | |
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142 break; |
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143 |
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144 a[i].e = j; /* use equivalence class for quick compare */ |
474 | 145 if(h[j].len <= t) |
146 a[i].n = h[j].pos; /* point to head of match list */ | |
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147 else |
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148 a[i].n = -1; /* too popular */ |
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149 } |
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150 |
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151 /* discard hash tables */ |
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152 free(h); |
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153 return 1; |
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154 } |
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155 |
474 | 156 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
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157 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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158 { |
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159 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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160 |
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161 for (i = a1; i < a2; i++) { |
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162 /* skip things before the current block */ |
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163 for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
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164 ; |
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165 |
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166 /* loop through all lines match a[i] in b */ |
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167 for (; j != -1 && j < b2; j = b[j].n) { |
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168 /* does this extend an earlier match? */ |
474 | 169 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
170 k = pos[j - 1].len + 1; | |
400
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171 else |
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172 k = 1; |
474 | 173 pos[j].pos = i; |
174 pos[j].len = k; | |
400
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175 |
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176 /* best match so far? */ |
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177 if (k > mk) { |
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178 mi = i; |
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179 mj = j; |
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180 mk = k; |
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181 } |
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182 } |
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183 } |
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184 |
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185 if (mk) { |
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186 mi = mi - mk + 1; |
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187 mj = mj - mk + 1; |
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188 } |
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189 |
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190 /* expand match to include neighboring popular lines */ |
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191 while (mi - mb > a1 && mj - mb > b1 && |
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192 a[mi - mb - 1].e == b[mj - mb - 1].e) |
400
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193 mb++; |
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194 while (mi + mk < a2 && mj + mk < b2 && |
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195 a[mi + mk].e == b[mj + mk].e) |
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196 mk++; |
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197 |
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198 *omi = mi - mb; |
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199 *omj = mj - mb; |
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200 return mk + mb; |
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201 } |
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202 |
474 | 203 static void recurse(struct line *a, struct line *b, struct pos *pos, |
400
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204 int a1, int a2, int b1, int b2, struct hunklist *l) |
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205 { |
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206 int i, j, k; |
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207 |
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208 /* find the longest match in this chunk */ |
474 | 209 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
400
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210 if (!k) |
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211 return; |
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212 |
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213 /* and recurse on the remaining chunks on either side */ |
474 | 214 recurse(a, b, pos, a1, i, b1, j, l); |
400
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215 l->head->a1 = i; |
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216 l->head->a2 = i + k; |
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217 l->head->b1 = j; |
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218 l->head->b2 = j + k; |
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219 l->head++; |
474 | 220 recurse(a, b, pos, i + k, a2, j + k, b2, l); |
400
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221 } |
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222 |
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223 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
400
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224 { |
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225 struct hunklist l; |
474 | 226 struct pos *pos; |
227 int t; | |
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228 |
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229 /* allocate and fill arrays */ |
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230 t = equatelines(a, an, b, bn); |
474 | 231 pos = calloc(bn, sizeof(struct pos)); |
433
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232 l.head = l.base = malloc(sizeof(struct hunk) * ((an + bn) / 4 + 2)); |
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233 |
474 | 234 if (pos && l.base && t) { |
433
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235 /* generate the matching block list */ |
474 | 236 recurse(a, b, pos, 0, an, 0, bn, &l); |
433
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237 l.head->a1 = an; |
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238 l.head->b1 = bn; |
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239 l.head++; |
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240 } |
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241 |
474 | 242 free(pos); |
433
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243 return l; |
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244 } |
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245 |
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246 static PyObject *blocks(PyObject *self, PyObject *args) |
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247 { |
435 | 248 PyObject *sa, *sb, *rl = NULL, *m; |
433
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249 struct line *a, *b; |
400
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250 struct hunklist l; |
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251 struct hunk *h; |
433
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252 int an, bn, pos = 0; |
400
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253 |
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254 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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255 return NULL; |
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256 |
433
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257 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
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258 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
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259 if (!a || !b) |
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260 goto nomem; |
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261 |
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262 l = diff(a, an, b, bn); |
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263 rl = PyList_New(l.head - l.base); |
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264 if (!l.head || !rl) |
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265 goto nomem; |
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266 |
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267 for(h = l.base; h != l.head; h++) { |
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268 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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269 PyList_SetItem(rl, pos, m); |
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270 pos++; |
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271 } |
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272 |
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273 nomem: |
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274 free(a); |
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275 free(b); |
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276 free(l.base); |
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277 return rl ? rl : PyErr_NoMemory(); |
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278 } |
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279 |
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280 static PyObject *bdiff(PyObject *self, PyObject *args) |
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281 { |
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282 PyObject *sa, *sb, *result = NULL; |
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283 struct line *al, *bl; |
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284 struct hunklist l; |
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285 struct hunk *h; |
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286 char encode[12], *rb; |
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287 int an, bn, len = 0, la = 0, lb = 0; |
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288 |
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289 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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290 return NULL; |
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291 |
400
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292 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al); |
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293 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
433
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294 if (!al || !bl) |
400
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295 goto nomem; |
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296 |
433
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297 l = diff(al, an, bl, bn); |
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298 if (!l.head) |
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299 goto nomem; |
400
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300 |
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301 /* calculate length of output */ |
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302 for(h = l.base; h != l.head; h++) { |
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303 if (h->a1 != la || h->b1 != lb) |
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304 len += 12 + bl[h->b1].l - bl[lb].l; |
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305 la = h->a2; |
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306 lb = h->b2; |
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307 } |
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308 |
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309 result = PyString_FromStringAndSize(NULL, len); |
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310 if (!result) |
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311 goto nomem; |
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312 |
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313 /* build binary patch */ |
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314 rb = PyString_AsString(result); |
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315 la = lb = 0; |
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316 |
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317 for(h = l.base; h != l.head; h++) { |
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318 if (h->a1 != la || h->b1 != lb) { |
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319 len = bl[h->b1].l - bl[lb].l; |
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320 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
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321 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
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322 *(uint32_t *)(encode + 8) = htonl(len); |
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323 memcpy(rb, encode, 12); |
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324 memcpy(rb + 12, bl[lb].l, len); |
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325 rb += 12 + len; |
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326 } |
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327 la = h->a2; |
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328 lb = h->b2; |
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329 } |
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330 |
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331 nomem: |
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332 free(al); |
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333 free(bl); |
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334 free(l.base); |
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335 return result ? result : PyErr_NoMemory(); |
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336 } |
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337 |
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338 static char mdiff_doc[] = "Efficient binary diff."; |
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339 |
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340 static PyMethodDef methods[] = { |
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341 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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342 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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343 {NULL, NULL} |
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344 }; |
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345 |
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346 PyMODINIT_FUNC initbdiff(void) |
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347 { |
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348 Py_InitModule3("bdiff", methods, mdiff_doc); |
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349 } |