Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bdiff.c @ 2499:894435215344
Added ui.configlist method to get comma/space separated lists of strings.
For example:
users = alice, bob
colors = red green blue
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Mon, 26 Jun 2006 14:52:26 +0200 |
parents | 5583d5ef257e |
children | 860e9c83fc59 |
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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 |
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16 #ifdef __hpux |
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17 #define inline |
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18 #endif |
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19 |
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20 #ifdef __SUNPRO_C |
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21 # define inline |
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22 #endif |
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23 |
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24 #ifdef _WIN32 |
551 | 25 #ifdef _MSC_VER |
26 #define inline __inline | |
27 typedef unsigned long uint32_t; | |
28 #else | |
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29 #include <stdint.h> |
551 | 30 #endif |
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31 static uint32_t htonl(uint32_t x) |
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32 { |
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33 return ((x & 0x000000ffUL) << 24) | |
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34 ((x & 0x0000ff00UL) << 8) | |
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35 ((x & 0x00ff0000UL) >> 8) | |
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36 ((x & 0xff000000UL) >> 24); |
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37 } |
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38 #else |
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39 #include <sys/types.h> |
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40 #include <arpa/inet.h> |
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41 #include <stdint.h> |
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42 #endif |
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43 |
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44 struct line { |
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45 int h, len, n, e; |
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46 const char *l; |
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47 }; |
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48 |
474 | 49 struct pos { |
50 int pos, len; | |
51 }; | |
52 | |
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53 struct hunk { |
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54 int a1, a2, b1, b2; |
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55 }; |
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56 |
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57 struct hunklist { |
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58 struct hunk *base, *head; |
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59 }; |
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60 |
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61 static inline uint32_t rol32(uint32_t word, unsigned int shift) |
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62 { |
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63 return (word << shift) | (word >> (32 - shift)); |
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64 } |
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65 |
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66 int splitlines(const char *a, int len, struct line **lr) |
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67 { |
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68 int h, i; |
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69 const char *p, *b = a; |
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70 struct line *l; |
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71 |
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72 /* count the lines */ |
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73 i = 1; /* extra line for sentinel */ |
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74 for (p = a; p < a + len; p++) |
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75 if (*p == '\n' || p == a + len - 1) |
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76 i++; |
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77 |
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78 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
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79 if (!l) |
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80 return -1; |
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81 |
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82 /* build the line array and calculate hashes */ |
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83 h = 0; |
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84 for (p = a; p < a + len; p++) { |
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85 h = *p + rol32(h, 7); /* a simple hash from GNU diff */ |
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86 if (*p == '\n' || p == a + len - 1) { |
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87 l->len = p - b + 1; |
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88 l->h = h * l->len; |
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89 l->l = b; |
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90 l->n = -1; |
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91 l++; |
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92 b = p + 1; |
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93 h = 0; |
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94 } |
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95 } |
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96 |
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97 /* set up a sentinel */ |
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98 l->h = l->len = 0; |
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99 l->l = a + len; |
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100 return i - 1; |
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101 } |
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102 |
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103 int inline cmp(struct line *a, struct line *b) |
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104 { |
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105 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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106 } |
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107 |
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108 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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109 { |
474 | 110 int i, j, buckets = 1, t; |
111 struct pos *h; | |
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112 |
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113 /* build a hash table of the next highest power of 2 */ |
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114 while (buckets < bn + 1) |
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115 buckets *= 2; |
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116 |
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117 h = (struct pos *)malloc(buckets * sizeof(struct pos)); |
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118 buckets = buckets - 1; |
474 | 119 if (!h) |
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120 return 0; |
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121 |
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122 /* clear the hash table */ |
474 | 123 for (i = 0; i <= buckets; i++) { |
124 h[i].pos = -1; | |
125 h[i].len = 0; | |
126 } | |
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127 |
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128 /* add lines to the hash table chains */ |
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129 for (i = bn - 1; i >= 0; i--) { |
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130 /* find the equivalence class */ |
474 | 131 for (j = b[i].h & buckets; h[j].pos != -1; |
132 j = (j + 1) & buckets) | |
133 if (!cmp(b + i, b + h[j].pos)) | |
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134 break; |
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135 |
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136 /* add to the head of the equivalence class */ |
474 | 137 b[i].n = h[j].pos; |
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138 b[i].e = j; |
474 | 139 h[j].pos = i; |
140 h[j].len++; /* keep track of popularity */ | |
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141 } |
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142 |
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143 /* compute popularity threshold */ |
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144 t = (bn >= 200) ? bn / 100 : bn + 1; |
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145 |
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146 /* match items in a to their equivalence class in b */ |
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147 for (i = 0; i < an; i++) { |
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148 /* find the equivalence class */ |
474 | 149 for (j = a[i].h & buckets; h[j].pos != -1; |
150 j = (j + 1) & buckets) | |
151 if (!cmp(a + i, b + h[j].pos)) | |
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152 break; |
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153 |
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154 a[i].e = j; /* use equivalence class for quick compare */ |
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155 if (h[j].len <= t) |
474 | 156 a[i].n = h[j].pos; /* point to head of match list */ |
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157 else |
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158 a[i].n = -1; /* too popular */ |
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159 } |
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160 |
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161 /* discard hash tables */ |
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162 free(h); |
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163 return 1; |
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164 } |
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165 |
474 | 166 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
400
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167 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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168 { |
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169 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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170 |
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171 for (i = a1; i < a2; i++) { |
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172 /* skip things before the current block */ |
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173 for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
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174 ; |
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175 |
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176 /* loop through all lines match a[i] in b */ |
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177 for (; j != -1 && j < b2; j = b[j].n) { |
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178 /* does this extend an earlier match? */ |
474 | 179 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
180 k = pos[j - 1].len + 1; | |
400
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181 else |
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182 k = 1; |
474 | 183 pos[j].pos = i; |
184 pos[j].len = k; | |
400
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185 |
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186 /* best match so far? */ |
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187 if (k > mk) { |
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188 mi = i; |
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189 mj = j; |
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190 mk = k; |
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191 } |
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192 } |
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193 } |
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194 |
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195 if (mk) { |
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196 mi = mi - mk + 1; |
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197 mj = mj - mk + 1; |
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198 } |
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199 |
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200 /* expand match to include neighboring popular lines */ |
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201 while (mi - mb > a1 && mj - mb > b1 && |
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202 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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203 mb++; |
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204 while (mi + mk < a2 && mj + mk < b2 && |
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205 a[mi + mk].e == b[mj + mk].e) |
400
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206 mk++; |
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207 |
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208 *omi = mi - mb; |
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209 *omj = mj - mb; |
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210 return mk + mb; |
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211 } |
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212 |
474 | 213 static void recurse(struct line *a, struct line *b, struct pos *pos, |
400
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214 int a1, int a2, int b1, int b2, struct hunklist *l) |
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215 { |
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216 int i, j, k; |
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217 |
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218 /* find the longest match in this chunk */ |
474 | 219 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
400
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220 if (!k) |
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221 return; |
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222 |
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223 /* and recurse on the remaining chunks on either side */ |
474 | 224 recurse(a, b, pos, a1, i, b1, j, l); |
400
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225 l->head->a1 = i; |
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226 l->head->a2 = i + k; |
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227 l->head->b1 = j; |
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228 l->head->b2 = j + k; |
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229 l->head++; |
474 | 230 recurse(a, b, pos, i + k, a2, j + k, b2, l); |
400
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231 } |
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232 |
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233 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
400
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234 { |
433
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235 struct hunklist l; |
474 | 236 struct pos *pos; |
237 int t; | |
433
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238 |
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239 /* allocate and fill arrays */ |
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240 t = equatelines(a, an, b, bn); |
1978
10606ee61107
do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents:
1759
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changeset
|
241 pos = (struct pos *)calloc(bn, sizeof(struct pos)); |
827
a61728b58dc0
Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents:
597
diff
changeset
|
242 /* we can't have more matches than lines in the shorter file */ |
1978
10606ee61107
do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents:
1759
diff
changeset
|
243 l.head = l.base = (struct hunk *)malloc(sizeof(struct hunk) * |
10606ee61107
do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents:
1759
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|
244 ((an<bn ? an:bn) + 1)); |
433
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245 |
474 | 246 if (pos && l.base && t) { |
433
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247 /* generate the matching block list */ |
474 | 248 recurse(a, b, pos, 0, an, 0, bn, &l); |
433
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249 l.head->a1 = an; |
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250 l.head->b1 = bn; |
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251 l.head++; |
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|
252 } |
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253 |
474 | 254 free(pos); |
433
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255 return l; |
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changeset
|
256 } |
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changeset
|
257 |
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changeset
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258 static PyObject *blocks(PyObject *self, PyObject *args) |
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diff
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259 { |
435 | 260 PyObject *sa, *sb, *rl = NULL, *m; |
433
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diff
changeset
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261 struct line *a, *b; |
970 | 262 struct hunklist l = {NULL, NULL}; |
400
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|
263 struct hunk *h; |
433
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diff
changeset
|
264 int an, bn, pos = 0; |
400
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265 |
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266 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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267 return NULL; |
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268 |
433
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diff
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269 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
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diff
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270 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
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diff
changeset
|
271 if (!a || !b) |
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|
272 goto nomem; |
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diff
changeset
|
273 |
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diff
changeset
|
274 l = diff(a, an, b, bn); |
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diff
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275 rl = PyList_New(l.head - l.base); |
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diff
changeset
|
276 if (!l.head || !rl) |
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diff
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|
277 goto nomem; |
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diff
changeset
|
278 |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
279 for (h = l.base; h != l.head; h++) { |
433
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diff
changeset
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280 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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diff
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281 PyList_SetItem(rl, pos, m); |
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diff
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282 pos++; |
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diff
changeset
|
283 } |
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diff
changeset
|
284 |
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411
diff
changeset
|
285 nomem: |
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diff
changeset
|
286 free(a); |
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diff
changeset
|
287 free(b); |
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diff
changeset
|
288 free(l.base); |
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changeset
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289 return rl ? rl : PyErr_NoMemory(); |
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diff
changeset
|
290 } |
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diff
changeset
|
291 |
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diff
changeset
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292 static PyObject *bdiff(PyObject *self, PyObject *args) |
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diff
changeset
|
293 { |
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diff
changeset
|
294 PyObject *sa, *sb, *result = NULL; |
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diff
changeset
|
295 struct line *al, *bl; |
970 | 296 struct hunklist l = {NULL, NULL}; |
433
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diff
changeset
|
297 struct hunk *h; |
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diff
changeset
|
298 char encode[12], *rb; |
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diff
changeset
|
299 int an, bn, len = 0, la = 0, lb = 0; |
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diff
changeset
|
300 |
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diff
changeset
|
301 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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diff
changeset
|
302 return NULL; |
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diff
changeset
|
303 |
400
8b067bde6679
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changeset
|
304 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al); |
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Add a fast binary diff extension (not yet used)
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changeset
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305 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
433
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411
diff
changeset
|
306 if (!al || !bl) |
400
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parents:
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|
307 goto nomem; |
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diff
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|
308 |
433
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411
diff
changeset
|
309 l = diff(al, an, bl, bn); |
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310 if (!l.head) |
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311 goto nomem; |
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312 |
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313 /* calculate length of output */ |
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314 for (h = l.base; h != l.head; h++) { |
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315 if (h->a1 != la || h->b1 != lb) |
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316 len += 12 + bl[h->b1].l - bl[lb].l; |
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317 la = h->a2; |
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318 lb = h->b2; |
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319 } |
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320 |
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321 result = PyString_FromStringAndSize(NULL, len); |
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322 if (!result) |
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323 goto nomem; |
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324 |
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325 /* build binary patch */ |
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326 rb = PyString_AsString(result); |
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327 la = lb = 0; |
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328 |
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329 for (h = l.base; h != l.head; h++) { |
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330 if (h->a1 != la || h->b1 != lb) { |
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331 len = bl[h->b1].l - bl[lb].l; |
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332 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
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333 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
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334 *(uint32_t *)(encode + 8) = htonl(len); |
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335 memcpy(rb, encode, 12); |
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336 memcpy(rb + 12, bl[lb].l, len); |
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337 rb += 12 + len; |
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338 } |
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339 la = h->a2; |
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340 lb = h->b2; |
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341 } |
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342 |
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343 nomem: |
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344 free(al); |
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345 free(bl); |
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346 free(l.base); |
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347 return result ? result : PyErr_NoMemory(); |
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348 } |
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349 |
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350 static char mdiff_doc[] = "Efficient binary diff."; |
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351 |
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352 static PyMethodDef methods[] = { |
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353 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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354 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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355 {NULL, NULL} |
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356 }; |
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357 |
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358 PyMODINIT_FUNC initbdiff(void) |
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359 { |
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360 Py_InitModule3("bdiff", methods, mdiff_doc); |
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361 } |
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362 |