Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bdiff.c @ 1946:9fee186f7f0d
bundlerepo: remove relative import, fix a comment
author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
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date | Mon, 13 Mar 2006 06:58:31 +0100 |
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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 #endif |
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42 |
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43 struct line { |
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44 int h, len, n, e; |
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45 const char *l; |
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46 }; |
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47 |
474 | 48 struct pos { |
49 int pos, len; | |
50 }; | |
51 | |
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52 struct hunk { |
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53 int a1, a2, b1, b2; |
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54 }; |
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55 |
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56 struct hunklist { |
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57 struct hunk *base, *head; |
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58 }; |
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59 |
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60 static inline uint32_t rol32(uint32_t word, unsigned int shift) |
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61 { |
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62 return (word << shift) | (word >> (32 - shift)); |
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63 } |
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64 |
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65 int splitlines(const char *a, int len, struct line **lr) |
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66 { |
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67 int h, i; |
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68 const char *p, *b = a; |
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69 struct line *l; |
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70 |
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71 /* count the lines */ |
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72 i = 1; /* extra line for sentinel */ |
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73 for (p = a; p < a + len; p++) |
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74 if (*p == '\n' || p == a + len - 1) |
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75 i++; |
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76 |
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77 *lr = l = malloc(sizeof(struct line) * i); |
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78 if (!l) |
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79 return -1; |
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80 |
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81 /* build the line array and calculate hashes */ |
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82 h = 0; |
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83 for (p = a; p < a + len; p++) { |
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84 h = *p + rol32(h, 7); /* a simple hash from GNU diff */ |
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85 if (*p == '\n' || p == a + len - 1) { |
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86 l->len = p - b + 1; |
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87 l->h = h * l->len; |
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88 l->l = b; |
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89 l->n = -1; |
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90 l++; |
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91 b = p + 1; |
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92 h = 0; |
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93 } |
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94 } |
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95 |
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96 /* set up a sentinel */ |
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97 l->h = l->len = 0; |
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98 l->l = a + len; |
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99 return i - 1; |
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100 } |
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101 |
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102 int inline cmp(struct line *a, struct line *b) |
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103 { |
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104 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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105 } |
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106 |
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107 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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108 { |
474 | 109 int i, j, buckets = 1, t; |
110 struct pos *h; | |
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111 |
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112 /* build a hash table of the next highest power of 2 */ |
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113 while (buckets < bn + 1) |
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114 buckets *= 2; |
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115 |
474 | 116 h = malloc(buckets * sizeof(struct pos)); |
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117 buckets = buckets - 1; |
474 | 118 if (!h) |
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119 return 0; |
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120 |
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121 /* clear the hash table */ |
474 | 122 for (i = 0; i <= buckets; i++) { |
123 h[i].pos = -1; | |
124 h[i].len = 0; | |
125 } | |
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126 |
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127 /* add lines to the hash table chains */ |
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128 for (i = bn - 1; i >= 0; i--) { |
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129 /* find the equivalence class */ |
474 | 130 for (j = b[i].h & buckets; h[j].pos != -1; |
131 j = (j + 1) & buckets) | |
132 if (!cmp(b + i, b + h[j].pos)) | |
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133 break; |
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134 |
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135 /* add to the head of the equivalence class */ |
474 | 136 b[i].n = h[j].pos; |
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137 b[i].e = j; |
474 | 138 h[j].pos = i; |
139 h[j].len++; /* keep track of popularity */ | |
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140 } |
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141 |
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142 /* compute popularity threshold */ |
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143 t = (bn >= 200) ? bn / 100 : bn + 1; |
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144 |
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145 /* match items in a to their equivalence class in b */ |
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146 for (i = 0; i < an; i++) { |
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147 /* find the equivalence class */ |
474 | 148 for (j = a[i].h & buckets; h[j].pos != -1; |
149 j = (j + 1) & buckets) | |
150 if (!cmp(a + i, b + h[j].pos)) | |
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151 break; |
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152 |
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153 a[i].e = j; /* use equivalence class for quick compare */ |
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154 if (h[j].len <= t) |
474 | 155 a[i].n = h[j].pos; /* point to head of match list */ |
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156 else |
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157 a[i].n = -1; /* too popular */ |
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158 } |
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159 |
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160 /* discard hash tables */ |
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161 free(h); |
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162 return 1; |
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163 } |
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164 |
474 | 165 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
400
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166 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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167 { |
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168 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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169 |
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170 for (i = a1; i < a2; i++) { |
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171 /* skip things before the current block */ |
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172 for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
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173 ; |
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174 |
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175 /* loop through all lines match a[i] in b */ |
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176 for (; j != -1 && j < b2; j = b[j].n) { |
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177 /* does this extend an earlier match? */ |
474 | 178 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
179 k = pos[j - 1].len + 1; | |
400
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180 else |
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181 k = 1; |
474 | 182 pos[j].pos = i; |
183 pos[j].len = k; | |
400
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184 |
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185 /* best match so far? */ |
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186 if (k > mk) { |
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187 mi = i; |
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188 mj = j; |
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189 mk = k; |
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190 } |
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191 } |
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192 } |
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193 |
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194 if (mk) { |
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195 mi = mi - mk + 1; |
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196 mj = mj - mk + 1; |
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197 } |
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198 |
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199 /* expand match to include neighboring popular lines */ |
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200 while (mi - mb > a1 && mj - mb > b1 && |
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201 a[mi - mb - 1].e == b[mj - mb - 1].e) |
400
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202 mb++; |
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203 while (mi + mk < a2 && mj + mk < b2 && |
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204 a[mi + mk].e == b[mj + mk].e) |
400
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205 mk++; |
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206 |
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207 *omi = mi - mb; |
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208 *omj = mj - mb; |
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209 return mk + mb; |
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210 } |
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211 |
474 | 212 static void recurse(struct line *a, struct line *b, struct pos *pos, |
400
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213 int a1, int a2, int b1, int b2, struct hunklist *l) |
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214 { |
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215 int i, j, k; |
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216 |
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217 /* find the longest match in this chunk */ |
474 | 218 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
400
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219 if (!k) |
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220 return; |
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221 |
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222 /* and recurse on the remaining chunks on either side */ |
474 | 223 recurse(a, b, pos, a1, i, b1, j, l); |
400
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224 l->head->a1 = i; |
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225 l->head->a2 = i + k; |
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226 l->head->b1 = j; |
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227 l->head->b2 = j + k; |
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228 l->head++; |
474 | 229 recurse(a, b, pos, i + k, a2, j + k, b2, l); |
400
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230 } |
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231 |
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232 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
400
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233 { |
433
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234 struct hunklist l; |
474 | 235 struct pos *pos; |
236 int t; | |
433
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237 |
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238 /* allocate and fill arrays */ |
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239 t = equatelines(a, an, b, bn); |
474 | 240 pos = calloc(bn, sizeof(struct pos)); |
827
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Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
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597
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changeset
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241 /* we can't have more matches than lines in the shorter file */ |
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Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
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597
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242 l.head = l.base = malloc(sizeof(struct hunk) * ((an<bn ? an:bn) + 1)); |
433
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243 |
474 | 244 if (pos && l.base && t) { |
433
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245 /* generate the matching block list */ |
474 | 246 recurse(a, b, pos, 0, an, 0, bn, &l); |
433
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247 l.head->a1 = an; |
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248 l.head->b1 = bn; |
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249 l.head++; |
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250 } |
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251 |
474 | 252 free(pos); |
433
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253 return l; |
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254 } |
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255 |
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256 static PyObject *blocks(PyObject *self, PyObject *args) |
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257 { |
435 | 258 PyObject *sa, *sb, *rl = NULL, *m; |
433
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diff
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259 struct line *a, *b; |
970 | 260 struct hunklist l = {NULL, NULL}; |
400
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261 struct hunk *h; |
433
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changeset
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262 int an, bn, pos = 0; |
400
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263 |
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264 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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265 return NULL; |
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266 |
433
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267 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
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268 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
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diff
changeset
|
269 if (!a || !b) |
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270 goto nomem; |
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diff
changeset
|
271 |
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diff
changeset
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272 l = diff(a, an, b, bn); |
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diff
changeset
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273 rl = PyList_New(l.head - l.base); |
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diff
changeset
|
274 if (!l.head || !rl) |
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411
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changeset
|
275 goto nomem; |
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diff
changeset
|
276 |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
277 for (h = l.base; h != l.head; h++) { |
433
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411
diff
changeset
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278 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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diff
changeset
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279 PyList_SetItem(rl, pos, m); |
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diff
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280 pos++; |
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diff
changeset
|
281 } |
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changeset
|
282 |
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411
diff
changeset
|
283 nomem: |
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411
diff
changeset
|
284 free(a); |
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diff
changeset
|
285 free(b); |
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diff
changeset
|
286 free(l.base); |
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287 return rl ? rl : PyErr_NoMemory(); |
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changeset
|
288 } |
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289 |
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290 static PyObject *bdiff(PyObject *self, PyObject *args) |
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diff
changeset
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291 { |
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changeset
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292 PyObject *sa, *sb, *result = NULL; |
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411
diff
changeset
|
293 struct line *al, *bl; |
970 | 294 struct hunklist l = {NULL, NULL}; |
433
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diff
changeset
|
295 struct hunk *h; |
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diff
changeset
|
296 char encode[12], *rb; |
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diff
changeset
|
297 int an, bn, len = 0, la = 0, lb = 0; |
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diff
changeset
|
298 |
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diff
changeset
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299 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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diff
changeset
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300 return NULL; |
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changeset
|
301 |
400
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302 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al); |
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303 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
433
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411
diff
changeset
|
304 if (!al || !bl) |
400
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|
305 goto nomem; |
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|
306 |
433
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411
diff
changeset
|
307 l = diff(al, an, bl, bn); |
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411
diff
changeset
|
308 if (!l.head) |
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411
diff
changeset
|
309 goto nomem; |
400
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|
310 |
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parents:
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changeset
|
311 /* calculate length of output */ |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
312 for (h = l.base; h != l.head; h++) { |
400
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mpm@selenic.com
parents:
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313 if (h->a1 != la || h->b1 != lb) |
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314 len += 12 + bl[h->b1].l - bl[lb].l; |
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315 la = h->a2; |
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316 lb = h->b2; |
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317 } |
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318 |
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319 result = PyString_FromStringAndSize(NULL, len); |
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320 if (!result) |
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321 goto nomem; |
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322 |
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323 /* build binary patch */ |
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324 rb = PyString_AsString(result); |
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325 la = lb = 0; |
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326 |
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327 for (h = l.base; h != l.head; h++) { |
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328 if (h->a1 != la || h->b1 != lb) { |
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329 len = bl[h->b1].l - bl[lb].l; |
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330 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
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331 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
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332 *(uint32_t *)(encode + 8) = htonl(len); |
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333 memcpy(rb, encode, 12); |
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334 memcpy(rb + 12, bl[lb].l, len); |
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335 rb += 12 + len; |
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336 } |
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337 la = h->a2; |
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338 lb = h->b2; |
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339 } |
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340 |
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341 nomem: |
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342 free(al); |
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343 free(bl); |
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344 free(l.base); |
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345 return result ? result : PyErr_NoMemory(); |
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346 } |
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347 |
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348 static char mdiff_doc[] = "Efficient binary diff."; |
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349 |
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350 static PyMethodDef methods[] = { |
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351 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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352 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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353 {NULL, NULL} |
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354 }; |
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355 |
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356 PyMODINIT_FUNC initbdiff(void) |
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357 { |
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358 Py_InitModule3("bdiff", methods, mdiff_doc); |
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359 } |
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360 |