Mercurial > hg
annotate mercurial/bdiff.c @ 30076:400dfded8a29
py3: make the string unicode so its iterable in py3k
author | Mateusz Kwapich <mitrandir@fb.com> |
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date | Sat, 08 Oct 2016 08:45:28 -0700 |
parents | 9631ff5ebbeb |
children | d500ddae7494 |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
2859 | 4 Copyright 2005, 2006 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 <stdlib.h> |
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13 #include <string.h> |
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14 #include <limits.h> |
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15 |
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16 #include "compat.h" |
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17 #include "bitmanipulation.h" |
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18 #include "bdiff.h" |
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19 |
474 | 20 struct pos { |
21 int pos, len; | |
22 }; | |
23 | |
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24 int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr) |
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25 { |
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26 unsigned hash; |
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27 int i; |
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28 const char *p, *b = a; |
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29 const char * const plast = a + len - 1; |
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30 struct bdiff_line *l; |
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31 |
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32 /* count the lines */ |
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33 i = 1; /* extra line for sentinel */ |
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34 for (p = a; p < a + len; p++) |
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35 if (*p == '\n' || p == plast) |
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36 i++; |
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37 |
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38 *lr = l = (struct bdiff_line *)malloc(sizeof(struct bdiff_line) * i); |
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39 if (!l) |
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40 return -1; |
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41 |
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42 /* build the line array and calculate hashes */ |
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43 hash = 0; |
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44 for (p = a; p < a + len; p++) { |
5342 | 45 /* Leonid Yuriev's hash */ |
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46 hash = (hash * 1664525) + (unsigned char)*p + 1013904223; |
5342 | 47 |
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48 if (*p == '\n' || p == plast) { |
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49 l->hash = hash; |
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50 hash = 0; |
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51 l->len = p - b + 1; |
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52 l->l = b; |
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53 l->n = INT_MAX; |
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54 l++; |
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55 b = p + 1; |
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56 } |
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57 } |
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58 |
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59 /* set up a sentinel */ |
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60 l->hash = 0; |
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61 l->len = 0; |
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62 l->l = a + len; |
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63 return i - 1; |
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64 } |
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65 |
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66 static inline int cmp(struct bdiff_line *a, struct bdiff_line *b) |
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67 { |
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68 return a->hash != b->hash || a->len != b->len || memcmp(a->l, b->l, a->len); |
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69 } |
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70 |
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71 static int equatelines(struct bdiff_line *a, int an, struct bdiff_line *b, |
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72 int bn) |
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73 { |
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74 int i, j, buckets = 1, t, scale; |
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75 struct pos *h = NULL; |
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76 |
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77 /* build a hash table of the next highest power of 2 */ |
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78 while (buckets < bn + 1) |
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79 buckets *= 2; |
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80 |
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81 /* try to allocate a large hash table to avoid collisions */ |
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82 for (scale = 4; scale; scale /= 2) { |
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83 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos)); |
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84 if (h) |
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85 break; |
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86 } |
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87 |
474 | 88 if (!h) |
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89 return 0; |
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90 |
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91 buckets = buckets * scale - 1; |
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92 |
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93 /* clear the hash table */ |
474 | 94 for (i = 0; i <= buckets; i++) { |
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95 h[i].pos = -1; |
474 | 96 h[i].len = 0; |
97 } | |
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98 |
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99 /* add lines to the hash table chains */ |
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100 for (i = 0; i < bn; i++) { |
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101 /* find the equivalence class */ |
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102 for (j = b[i].hash & buckets; h[j].pos != -1; |
474 | 103 j = (j + 1) & buckets) |
104 if (!cmp(b + i, b + h[j].pos)) | |
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105 break; |
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106 |
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107 /* add to the head of the equivalence class */ |
474 | 108 b[i].n = h[j].pos; |
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109 b[i].e = j; |
474 | 110 h[j].pos = i; |
111 h[j].len++; /* keep track of popularity */ | |
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112 } |
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113 |
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114 /* compute popularity threshold */ |
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115 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1); |
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116 |
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117 /* match items in a to their equivalence class in b */ |
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118 for (i = 0; i < an; i++) { |
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119 /* find the equivalence class */ |
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120 for (j = a[i].hash & buckets; h[j].pos != -1; |
474 | 121 j = (j + 1) & buckets) |
122 if (!cmp(a + i, b + h[j].pos)) | |
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123 break; |
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124 |
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125 a[i].e = j; /* use equivalence class for quick compare */ |
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126 if (h[j].len <= t) |
474 | 127 a[i].n = h[j].pos; /* point to head of match list */ |
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128 else |
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129 a[i].n = -1; /* too popular */ |
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130 } |
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131 |
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132 /* discard hash tables */ |
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133 free(h); |
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134 return 1; |
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135 } |
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136 |
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137 static int longest_match(struct bdiff_line *a, struct bdiff_line *b, |
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138 struct pos *pos, |
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139 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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140 { |
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141 int mi = a1, mj = b1, mk = 0, i, j, k, half; |
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142 |
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143 /* window our search on large regions to better bound |
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144 worst-case performance. by choosing a window at the end, we |
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145 reduce skipping overhead on the b chains. */ |
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146 if (a2 - a1 > 30000) |
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147 a1 = a2 - 30000; |
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148 |
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149 half = (a1 + a2) / 2; |
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150 |
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151 for (i = a1; i < a2; i++) { |
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152 /* skip all lines in b after the current block */ |
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153 for (j = a[i].n; j >= b2; j = b[j].n) |
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154 ; |
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155 |
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156 /* loop through all lines match a[i] in b */ |
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157 for (; j >= b1; j = b[j].n) { |
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158 /* does this extend an earlier match? */ |
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159 for (k = 1; j - k >= b1 && i - k >= a1; k++) { |
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160 /* reached an earlier match? */ |
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161 if (pos[j - k].pos == i - k) { |
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162 k += pos[j - k].len; |
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163 break; |
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164 } |
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165 /* previous line mismatch? */ |
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166 if (a[i - k].e != b[j - k].e) |
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167 break; |
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168 } |
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169 |
474 | 170 pos[j].pos = i; |
171 pos[j].len = k; | |
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172 |
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173 /* best match so far? we prefer matches closer |
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174 to the middle to balance recursion */ |
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175 if (k > mk || (k == mk && (i <= mi || i < half))) { |
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176 mi = i; |
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177 mj = j; |
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178 mk = k; |
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179 } |
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180 } |
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181 } |
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182 |
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183 if (mk) { |
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184 mi = mi - mk + 1; |
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185 mj = mj - mk + 1; |
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186 } |
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187 |
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188 /* expand match to include subsequent popular lines */ |
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189 while (mi + mk < a2 && mj + mk < b2 && |
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190 a[mi + mk].e == b[mj + mk].e) |
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191 mk++; |
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192 |
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193 *omi = mi; |
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194 *omj = mj; |
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195 |
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196 return mk; |
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197 } |
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198 |
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199 static struct bdiff_hunk *recurse(struct bdiff_line *a, struct bdiff_line *b, |
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200 struct pos *pos, |
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201 int a1, int a2, int b1, int b2, struct bdiff_hunk *l) |
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202 { |
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203 int i, j, k; |
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204 |
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205 while (1) { |
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206 /* find the longest match in this chunk */ |
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207 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
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208 if (!k) |
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209 return l; |
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210 |
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211 /* and recurse on the remaining chunks on either side */ |
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212 l = recurse(a, b, pos, a1, i, b1, j, l); |
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213 if (!l) |
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214 return NULL; |
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215 |
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216 l->next = (struct bdiff_hunk *)malloc(sizeof(struct bdiff_hunk)); |
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217 if (!l->next) |
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218 return NULL; |
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219 |
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220 l = l->next; |
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221 l->a1 = i; |
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222 l->a2 = i + k; |
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223 l->b1 = j; |
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224 l->b2 = j + k; |
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225 l->next = NULL; |
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226 |
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227 /* tail-recursion didn't happen, so do equivalent iteration */ |
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228 a1 = i + k; |
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229 b1 = j + k; |
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230 } |
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231 } |
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232 |
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233 int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, |
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234 int bn, struct bdiff_hunk *base) |
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235 { |
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236 struct bdiff_hunk *curr; |
474 | 237 struct pos *pos; |
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238 int t, count = 0; |
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239 |
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240 /* allocate and fill arrays */ |
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241 t = equatelines(a, an, b, bn); |
5571 | 242 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos)); |
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243 |
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244 if (pos && t) { |
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245 /* generate the matching block list */ |
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246 |
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247 curr = recurse(a, b, pos, 0, an, 0, bn, base); |
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248 if (!curr) |
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249 return -1; |
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250 |
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251 /* sentinel end hunk */ |
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252 curr->next = (struct bdiff_hunk *)malloc(sizeof(struct bdiff_hunk)); |
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253 if (!curr->next) |
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254 return -1; |
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255 curr = curr->next; |
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256 curr->a1 = curr->a2 = an; |
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257 curr->b1 = curr->b2 = bn; |
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258 curr->next = NULL; |
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259 } |
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260 |
474 | 261 free(pos); |
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262 |
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263 /* normalize the hunk list, try to push each hunk towards the end */ |
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264 for (curr = base->next; curr; curr = curr->next) { |
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265 struct bdiff_hunk *next = curr->next; |
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266 |
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267 if (!next) |
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268 break; |
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269 |
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270 if (curr->a2 == next->a1 || curr->b2 == next->b1) |
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271 while (curr->a2 < an && curr->b2 < bn |
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272 && next->a1 < next->a2 |
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Matt Mackall <mpm@selenic.com>
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273 && next->b1 < next->b2 |
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bdiff: fold in shift calculation in normalize
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274 && !cmp(a + curr->a2, b + curr->b2)) { |
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275 curr->a2++; |
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276 next->a1++; |
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277 curr->b2++; |
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278 next->b1++; |
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279 } |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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280 } |
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bdiff: normalize the diff (issue1295)
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281 |
13089
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bdiff: dynamically allocate hunks
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282 for (curr = base->next; curr; curr = curr->next) |
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283 count++; |
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284 return count; |
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285 } |
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286 |
29541
9631ff5ebbeb
bdiff: split bdiff into cpy-aware and cpy-agnostic part
Maciej Fijalkowski <fijall@gmail.com>
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287 void bdiff_freehunks(struct bdiff_hunk *l) |
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288 { |
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4ce1fc91e30a
bdiff: rename functions and structs to be amenable for later exporting
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289 struct bdiff_hunk *n; |
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290 for (; l; l = n) { |
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291 n = l->next; |
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292 free(l); |
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293 } |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
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294 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
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295 |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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296 |