Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bdiff.c @ 455:8d43dfdfb514
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author | mpm@selenic.com |
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date | Thu, 23 Jun 2005 18:49:38 -0800 |
parents | f81a011fba3d |
children | ea93402b81b9 50da4bb9cab6 |
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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 |
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16 |
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17 typedef unsigned long uint32_t; |
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18 |
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19 static uint32_t htonl(uint32_t x) |
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20 { |
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21 return ((x & 0x000000ffUL) << 24) | |
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22 ((x & 0x0000ff00UL) << 8) | |
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23 ((x & 0x00ff0000UL) >> 8) | |
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24 ((x & 0xff000000UL) >> 24); |
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25 } |
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26 |
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27 #else |
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28 #include <netinet/in.h> |
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29 #include <sys/types.h> |
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30 #endif |
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31 |
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32 struct line { |
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33 int h, len, n, e; |
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34 const char *l; |
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35 }; |
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36 |
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37 struct hunk { |
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38 int a1, a2, b1, b2; |
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39 }; |
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40 |
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41 struct hunklist { |
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42 struct hunk *base, *head; |
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43 }; |
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44 |
439 | 45 static __inline uint32_t rol32(uint32_t word, unsigned int shift) |
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46 { |
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47 return (word << shift) | (word >> (32 - shift)); |
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48 } |
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49 |
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50 int splitlines(const char *a, int len, struct line **lr) |
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51 { |
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52 int h, i; |
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53 const char *p, *b = a; |
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54 struct line *l; |
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55 |
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56 /* count the lines */ |
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57 i = 1; /* extra line for sentinel */ |
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58 for (p = a; p < a + len; p++) |
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59 if (*p == '\n' || p == a + len - 1) |
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60 i++; |
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61 |
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62 *lr = l = malloc(sizeof(struct line) * i); |
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63 if (!l) |
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64 return -1; |
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65 |
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66 /* build the line array and calculate hashes */ |
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67 h = 0; |
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68 for (p = a; p < a + len; p++) { |
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69 h = *p + rol32(h, 7); /* a simple hash from GNU diff */ |
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70 if (*p == '\n' || p == a + len - 1) { |
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71 l->len = p - b + 1; |
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72 l->h = h * l->len; |
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73 l->l = b; |
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74 l->n = -1; |
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75 l++; |
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76 b = p + 1; |
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77 h = 0; |
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78 } |
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79 } |
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80 |
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81 /* set up a sentinel */ |
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82 l->h = l->len = 0; |
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83 l->l = a + len; |
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84 return i - 1; |
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85 } |
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86 |
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87 int inline cmp(struct line *a, struct line *b) |
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88 { |
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89 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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90 } |
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91 |
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92 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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93 { |
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94 int i, j, buckets = 1, t, *h, *l; |
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95 |
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96 /* build a hash table of the next highest power of 2 */ |
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97 while (buckets < bn + 1) |
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98 buckets *= 2; |
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99 |
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100 h = malloc(buckets * sizeof(int)); |
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101 l = calloc(buckets, sizeof(int)); |
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102 buckets = buckets - 1; |
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103 if (!h || !l) { |
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104 free(h); |
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105 return 0; |
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106 } |
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107 |
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108 /* clear the hash table */ |
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109 for (i = 0; i <= buckets; i++) |
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110 h[i] = -1; |
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111 |
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112 /* add lines to the hash table chains */ |
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113 for (i = bn - 1; i >= 0; i--) { |
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114 /* find the equivalence class */ |
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115 for (j = b[i].h & buckets; h[j] != -1; j = (j + 1) & buckets) |
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116 if (!cmp(b + i, b + h[j])) |
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117 break; |
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118 |
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119 /* add to the head of the equivalence class */ |
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120 b[i].n = h[j]; |
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121 b[i].e = j; |
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122 h[j] = i; |
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123 l[j]++; /* keep track of popularity */ |
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124 } |
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125 |
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126 /* compute popularity threshold */ |
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127 t = (bn >= 200) ? bn / 100 : bn + 1; |
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128 |
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129 /* match items in a to their equivalence class in b */ |
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130 for (i = 0; i < an; i++) { |
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131 /* find the equivalence class */ |
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132 for (j = a[i].h & buckets; h[j] != -1; j = (j + 1) & buckets) |
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133 if (!cmp(a + i, b + h[j])) |
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134 break; |
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135 |
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136 a[i].e = j; /* use equivalence class for quick compare */ |
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137 if(l[j] <= t) |
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138 a[i].n = h[j]; /* point to head of match list */ |
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139 else |
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140 a[i].n = -1; /* too popular */ |
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141 } |
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142 |
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143 /* discard hash tables */ |
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144 free(h); |
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145 free(l); |
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146 return 1; |
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147 } |
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148 |
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149 static int longest_match(struct line *a, struct line *b, int *jpos, int *jlen, |
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150 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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151 { |
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152 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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153 |
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154 for (i = a1; i < a2; i++) { |
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155 /* skip things before the current block */ |
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156 for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
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157 ; |
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158 |
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159 /* loop through all lines match a[i] in b */ |
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160 for (; j != -1 && j < b2; j = b[j].n) { |
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161 /* does this extend an earlier match? */ |
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162 if (i > a1 && j > b1 && jpos[j - 1] == i - 1) |
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163 k = jlen[j - 1] + 1; |
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164 else |
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165 k = 1; |
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166 jpos[j] = i; |
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167 jlen[j] = k; |
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168 |
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169 /* best match so far? */ |
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170 if (k > mk) { |
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171 mi = i; |
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172 mj = j; |
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173 mk = k; |
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174 } |
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175 } |
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176 } |
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177 |
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178 if (mk) { |
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179 mi = mi - mk + 1; |
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180 mj = mj - mk + 1; |
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181 } |
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182 |
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183 /* expand match to include neighboring popular lines */ |
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184 while (mi - mb > a1 && mj - mb > b1 && |
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185 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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186 mb++; |
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187 while (mi + mk < a2 && mj + mk < b2 && |
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188 a[mi + mk].e == b[mj + mk].e) |
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189 mk++; |
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190 |
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191 *omi = mi - mb; |
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192 *omj = mj - mb; |
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193 return mk + mb; |
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194 } |
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195 |
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196 static void recurse(struct line *a, struct line *b, int *jpos, int *jlen, |
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197 int a1, int a2, int b1, int b2, struct hunklist *l) |
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198 { |
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199 int i, j, k; |
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200 |
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201 /* find the longest match in this chunk */ |
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202 k = longest_match(a, b, jpos, jlen, a1, a2, b1, b2, &i, &j); |
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203 if (!k) |
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204 return; |
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205 |
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206 /* and recurse on the remaining chunks on either side */ |
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207 recurse(a, b, jpos, jlen, a1, i, b1, j, l); |
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208 l->head->a1 = i; |
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209 l->head->a2 = i + k; |
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210 l->head->b1 = j; |
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211 l->head->b2 = j + k; |
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212 l->head++; |
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213 recurse(a, b, jpos, jlen, i + k, a2, j + k, b2, l); |
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214 } |
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215 |
433
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216 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
400
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217 { |
433
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218 struct hunklist l; |
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219 int *jpos, *jlen, t; |
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220 |
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221 /* allocate and fill arrays */ |
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222 t = equatelines(a, an, b, bn); |
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223 jpos = calloc(bn, sizeof(int)); |
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224 jlen = calloc(bn, sizeof(int)); |
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225 l.head = l.base = malloc(sizeof(struct hunk) * ((an + bn) / 4 + 2)); |
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226 |
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diff
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227 if (jpos && jlen && l.base && t) { |
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diff
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228 /* generate the matching block list */ |
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diff
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229 recurse(a, b, jpos, jlen, 0, an, 0, bn, &l); |
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diff
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230 l.head->a1 = an; |
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diff
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231 l.head->b1 = bn; |
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232 l.head++; |
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|
233 } |
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diff
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|
234 |
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diff
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|
235 free(jpos); |
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diff
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|
236 free(jlen); |
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|
237 return l; |
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|
238 } |
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diff
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|
239 |
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diff
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240 static PyObject *blocks(PyObject *self, PyObject *args) |
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diff
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241 { |
435 | 242 PyObject *sa, *sb, *rl = NULL, *m; |
433
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diff
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243 struct line *a, *b; |
400
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244 struct hunklist l; |
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245 struct hunk *h; |
433
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diff
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|
246 int an, bn, pos = 0; |
400
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247 |
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248 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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249 return NULL; |
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250 |
433
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diff
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251 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
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diff
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252 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
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diff
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|
253 if (!a || !b) |
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diff
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|
254 goto nomem; |
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diff
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|
255 |
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411
diff
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|
256 l = diff(a, an, b, bn); |
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diff
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|
257 rl = PyList_New(l.head - l.base); |
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diff
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|
258 if (!l.head || !rl) |
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diff
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|
259 goto nomem; |
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|
260 |
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diff
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|
261 for(h = l.base; h != l.head; h++) { |
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diff
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262 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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diff
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|
263 PyList_SetItem(rl, pos, m); |
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diff
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|
264 pos++; |
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diff
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|
265 } |
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diff
changeset
|
266 |
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411
diff
changeset
|
267 nomem: |
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diff
changeset
|
268 free(a); |
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diff
changeset
|
269 free(b); |
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diff
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|
270 free(l.base); |
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diff
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|
271 return rl ? rl : PyErr_NoMemory(); |
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diff
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|
272 } |
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diff
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|
273 |
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diff
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|
274 static PyObject *bdiff(PyObject *self, PyObject *args) |
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diff
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|
275 { |
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diff
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|
276 PyObject *sa, *sb, *result = NULL; |
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411
diff
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|
277 struct line *al, *bl; |
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411
diff
changeset
|
278 struct hunklist l; |
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411
diff
changeset
|
279 struct hunk *h; |
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280 char encode[12], *rb; |
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281 int an, bn, len = 0, la = 0, lb = 0; |
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282 |
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283 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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284 return NULL; |
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285 |
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286 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al); |
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287 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
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288 if (!al || !bl) |
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289 goto nomem; |
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290 |
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291 l = diff(al, an, bl, bn); |
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292 if (!l.head) |
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293 goto nomem; |
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294 |
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295 /* calculate length of output */ |
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296 for(h = l.base; h != l.head; h++) { |
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297 if (h->a1 != la || h->b1 != lb) |
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298 len += 12 + bl[h->b1].l - bl[lb].l; |
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299 la = h->a2; |
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300 lb = h->b2; |
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301 } |
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302 |
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303 result = PyString_FromStringAndSize(NULL, len); |
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304 if (!result) |
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305 goto nomem; |
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306 |
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307 /* build binary patch */ |
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308 rb = PyString_AsString(result); |
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309 la = lb = 0; |
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310 |
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311 for(h = l.base; h != l.head; h++) { |
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312 if (h->a1 != la || h->b1 != lb) { |
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313 len = bl[h->b1].l - bl[lb].l; |
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314 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
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315 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
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316 *(uint32_t *)(encode + 8) = htonl(len); |
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317 memcpy(rb, encode, 12); |
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318 memcpy(rb + 12, bl[lb].l, len); |
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319 rb += 12 + len; |
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320 } |
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321 la = h->a2; |
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322 lb = h->b2; |
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323 } |
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324 |
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325 nomem: |
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326 free(al); |
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327 free(bl); |
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328 free(l.base); |
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329 return result ? result : PyErr_NoMemory(); |
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330 } |
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331 |
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332 static char mdiff_doc[] = "Efficient binary diff."; |
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333 |
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334 static PyMethodDef methods[] = { |
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335 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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336 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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337 {NULL, NULL} |
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338 }; |
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339 |
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340 PyMODINIT_FUNC initbdiff(void) |
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341 { |
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342 Py_InitModule3("bdiff", methods, mdiff_doc); |
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343 } |