Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/bdiff.c @ 3569:a27d90c9336e
Stripping of query string (since 88b4755fa48f) stripped too much (issue327)
rstrip(qs) not only strips qs from the right, but it continues stripping
every char at the end of the URL that occurs on qs.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Sat, 28 Oct 2006 11:00:59 +0200 |
parents | 8c617d48564a |
children | 95ffa36d1d2a 1ca664c964e0 |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
2858 | 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 <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 #if defined __hpux || defined __SUNPRO_C || defined _AIX |
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17 # define inline |
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18 #endif |
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19 |
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20 #ifdef _WIN32 |
551 | 21 #ifdef _MSC_VER |
22 #define inline __inline | |
23 typedef unsigned long uint32_t; | |
24 #else | |
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25 #include <stdint.h> |
551 | 26 #endif |
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27 static uint32_t htonl(uint32_t x) |
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28 { |
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29 return ((x & 0x000000ffUL) << 24) | |
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30 ((x & 0x0000ff00UL) << 8) | |
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31 ((x & 0x00ff0000UL) >> 8) | |
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32 ((x & 0xff000000UL) >> 24); |
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33 } |
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34 #else |
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35 #include <sys/types.h> |
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36 #include <arpa/inet.h> |
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37 #include <inttypes.h> |
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38 #endif |
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39 |
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40 struct line { |
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41 int h, len, n, e; |
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42 const char *l; |
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43 }; |
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44 |
474 | 45 struct pos { |
46 int pos, len; | |
47 }; | |
48 | |
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49 struct hunk { |
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50 int a1, a2, b1, b2; |
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51 }; |
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52 |
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53 struct hunklist { |
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54 struct hunk *base, *head; |
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55 }; |
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56 |
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57 static inline uint32_t rol32(uint32_t word, unsigned int shift) |
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58 { |
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59 return (word << shift) | (word >> (32 - shift)); |
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60 } |
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61 |
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62 int splitlines(const char *a, int len, struct line **lr) |
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63 { |
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64 int g, h, i; |
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65 const char *p, *b = a; |
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66 struct line *l; |
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67 |
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68 /* count the lines */ |
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69 i = 1; /* extra line for sentinel */ |
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70 for (p = a; p < a + len; p++) |
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71 if (*p == '\n' || p == a + len - 1) |
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72 i++; |
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73 |
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74 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
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75 if (!l) |
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76 return -1; |
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77 |
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78 /* build the line array and calculate hashes */ |
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79 h = 0; |
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80 for (p = a; p < a + len; p++) { |
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81 /* |
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82 * a simple hash from GNU diff, with better collision |
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83 * resistance from hashpjw. this slows down common |
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84 * case by 10%, but speeds up worst case by 100x. |
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85 */ |
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86 h = *p + rol32(h, 7); |
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87 if ((g = h & 0xf0000000)) { |
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88 h ^= g >> 24; |
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89 h ^= g; |
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90 } |
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91 if (*p == '\n' || p == a + len - 1) { |
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92 l->len = p - b + 1; |
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93 l->h = h * l->len; |
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94 l->l = b; |
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95 l->n = -1; |
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96 l++; |
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97 b = p + 1; |
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98 h = 0; |
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99 } |
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100 } |
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101 |
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102 /* set up a sentinel */ |
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103 l->h = l->len = 0; |
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104 l->l = a + len; |
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105 return i - 1; |
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106 } |
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107 |
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108 int inline cmp(struct line *a, struct line *b) |
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109 { |
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110 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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111 } |
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112 |
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113 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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114 { |
474 | 115 int i, j, buckets = 1, t; |
116 struct pos *h; | |
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117 |
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118 /* build a hash table of the next highest power of 2 */ |
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119 while (buckets < bn + 1) |
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120 buckets *= 2; |
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121 |
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122 h = (struct pos *)malloc(buckets * sizeof(struct pos)); |
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123 buckets = buckets - 1; |
474 | 124 if (!h) |
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125 return 0; |
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126 |
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127 /* clear the hash table */ |
474 | 128 for (i = 0; i <= buckets; i++) { |
129 h[i].pos = -1; | |
130 h[i].len = 0; | |
131 } | |
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132 |
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133 /* add lines to the hash table chains */ |
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134 for (i = bn - 1; i >= 0; i--) { |
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135 /* find the equivalence class */ |
474 | 136 for (j = b[i].h & buckets; h[j].pos != -1; |
137 j = (j + 1) & buckets) | |
138 if (!cmp(b + i, b + h[j].pos)) | |
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139 break; |
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140 |
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141 /* add to the head of the equivalence class */ |
474 | 142 b[i].n = h[j].pos; |
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143 b[i].e = j; |
474 | 144 h[j].pos = i; |
145 h[j].len++; /* keep track of popularity */ | |
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146 } |
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147 |
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148 /* compute popularity threshold */ |
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149 t = (bn >= 200) ? bn / 100 : bn + 1; |
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150 |
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151 /* match items in a to their equivalence class in b */ |
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152 for (i = 0; i < an; i++) { |
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153 /* find the equivalence class */ |
474 | 154 for (j = a[i].h & buckets; h[j].pos != -1; |
155 j = (j + 1) & buckets) | |
156 if (!cmp(a + i, b + h[j].pos)) | |
400
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157 break; |
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158 |
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159 a[i].e = j; /* use equivalence class for quick compare */ |
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160 if (h[j].len <= t) |
474 | 161 a[i].n = h[j].pos; /* point to head of match list */ |
400
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162 else |
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163 a[i].n = -1; /* too popular */ |
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164 } |
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165 |
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166 /* discard hash tables */ |
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167 free(h); |
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168 return 1; |
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169 } |
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170 |
474 | 171 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
400
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172 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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173 { |
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174 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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175 |
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176 for (i = a1; i < a2; i++) { |
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177 /* skip things before the current block */ |
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178 for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
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179 ; |
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180 |
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181 /* loop through all lines match a[i] in b */ |
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182 for (; j != -1 && j < b2; j = b[j].n) { |
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183 /* does this extend an earlier match? */ |
474 | 184 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
185 k = pos[j - 1].len + 1; | |
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186 else |
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187 k = 1; |
474 | 188 pos[j].pos = i; |
189 pos[j].len = k; | |
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190 |
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191 /* best match so far? */ |
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192 if (k > mk) { |
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193 mi = i; |
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194 mj = j; |
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195 mk = k; |
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196 } |
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197 } |
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198 } |
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199 |
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200 if (mk) { |
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201 mi = mi - mk + 1; |
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202 mj = mj - mk + 1; |
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203 } |
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204 |
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205 /* expand match to include neighboring popular lines */ |
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206 while (mi - mb > a1 && mj - mb > b1 && |
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207 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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208 mb++; |
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209 while (mi + mk < a2 && mj + mk < b2 && |
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210 a[mi + mk].e == b[mj + mk].e) |
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211 mk++; |
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212 |
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213 *omi = mi - mb; |
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214 *omj = mj - mb; |
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215 return mk + mb; |
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216 } |
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217 |
474 | 218 static void recurse(struct line *a, struct line *b, struct pos *pos, |
400
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219 int a1, int a2, int b1, int b2, struct hunklist *l) |
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220 { |
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221 int i, j, k; |
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222 |
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223 /* find the longest match in this chunk */ |
474 | 224 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
400
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225 if (!k) |
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226 return; |
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227 |
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228 /* and recurse on the remaining chunks on either side */ |
474 | 229 recurse(a, b, pos, a1, i, b1, j, l); |
400
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230 l->head->a1 = i; |
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231 l->head->a2 = i + k; |
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232 l->head->b1 = j; |
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233 l->head->b2 = j + k; |
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234 l->head++; |
474 | 235 recurse(a, b, pos, i + k, a2, j + k, b2, l); |
400
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236 } |
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237 |
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238 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
400
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239 { |
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240 struct hunklist l; |
474 | 241 struct pos *pos; |
242 int t; | |
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243 |
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244 /* allocate and fill arrays */ |
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245 t = equatelines(a, an, b, bn); |
1978
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do proper typecasting on malloc() and calloc() calls
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246 pos = (struct 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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|
247 /* we can't have more matches than lines in the shorter file */ |
1978
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do proper typecasting on malloc() and calloc() calls
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248 l.head = l.base = (struct hunk *)malloc(sizeof(struct hunk) * |
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249 ((an<bn ? an:bn) + 1)); |
433
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250 |
474 | 251 if (pos && l.base && t) { |
433
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252 /* generate the matching block list */ |
474 | 253 recurse(a, b, pos, 0, an, 0, bn, &l); |
433
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254 l.head->a1 = an; |
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255 l.head->b1 = bn; |
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256 l.head++; |
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257 } |
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258 |
474 | 259 free(pos); |
433
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260 return l; |
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261 } |
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|
262 |
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263 static PyObject *blocks(PyObject *self, PyObject *args) |
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264 { |
435 | 265 PyObject *sa, *sb, *rl = NULL, *m; |
433
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266 struct line *a, *b; |
970 | 267 struct hunklist l = {NULL, NULL}; |
400
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|
268 struct hunk *h; |
433
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|
269 int an, bn, pos = 0; |
400
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270 |
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271 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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272 return NULL; |
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273 |
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274 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
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275 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
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276 if (!a || !b) |
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|
277 goto nomem; |
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278 |
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279 l = diff(a, an, b, bn); |
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280 rl = PyList_New(l.head - l.base); |
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diff
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281 if (!l.head || !rl) |
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282 goto nomem; |
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diff
changeset
|
283 |
1542
8e80eefb3de6
made C src formatting more consistent
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diff
changeset
|
284 for (h = l.base; h != l.head; h++) { |
433
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285 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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286 PyList_SetItem(rl, pos, m); |
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287 pos++; |
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288 } |
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289 |
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diff
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290 nomem: |
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291 free(a); |
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292 free(b); |
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293 free(l.base); |
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294 return rl ? rl : PyErr_NoMemory(); |
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|
295 } |
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296 |
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297 static PyObject *bdiff(PyObject *self, PyObject *args) |
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diff
changeset
|
298 { |
3333
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
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2858
diff
changeset
|
299 char *sa, *sb; |
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Teach bdiff to support buffer objects
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300 PyObject *result = NULL; |
433
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301 struct line *al, *bl; |
970 | 302 struct hunklist l = {NULL, NULL}; |
433
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|
303 struct hunk *h; |
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|
304 char encode[12], *rb; |
3333
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
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diff
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305 int an, bn, len = 0, la, lb; |
433
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diff
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306 |
3369
4bad632913d8
python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
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3333
diff
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307 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
433
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Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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308 return NULL; |
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309 |
3333
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2858
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310 an = splitlines(sa, la, &al); |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
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311 bn = splitlines(sb, lb, &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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312 if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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313 goto nomem; |
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mpm@selenic.com
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314 |
433
79c694462294
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mpm@selenic.com
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411
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315 l = diff(al, an, bl, bn); |
79c694462294
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mpm@selenic.com
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316 if (!l.head) |
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mpm@selenic.com
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317 goto nomem; |
400
8b067bde6679
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mpm@selenic.com
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318 |
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mpm@selenic.com
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319 /* calculate length of output */ |
3333
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Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2858
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320 la = lb = 0; |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
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321 for (h = l.base; h != l.head; h++) { |
400
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mpm@selenic.com
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322 if (h->a1 != la || h->b1 != lb) |
8b067bde6679
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mpm@selenic.com
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323 len += 12 + bl[h->b1].l - bl[lb].l; |
8b067bde6679
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mpm@selenic.com
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324 la = h->a2; |
8b067bde6679
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mpm@selenic.com
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325 lb = h->b2; |
8b067bde6679
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mpm@selenic.com
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326 } |
8b067bde6679
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mpm@selenic.com
parents:
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327 |
8b067bde6679
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mpm@selenic.com
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328 result = PyString_FromStringAndSize(NULL, len); |
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mpm@selenic.com
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329 if (!result) |
8b067bde6679
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mpm@selenic.com
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330 goto nomem; |
8b067bde6679
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mpm@selenic.com
parents:
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331 |
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mpm@selenic.com
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332 /* build binary patch */ |
8b067bde6679
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mpm@selenic.com
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333 rb = PyString_AsString(result); |
8b067bde6679
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mpm@selenic.com
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334 la = lb = 0; |
8b067bde6679
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mpm@selenic.com
parents:
diff
changeset
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335 |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
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336 for (h = l.base; h != l.head; h++) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
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337 if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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338 len = bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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339 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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340 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
8b067bde6679
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mpm@selenic.com
parents:
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changeset
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341 *(uint32_t *)(encode + 8) = htonl(len); |
8b067bde6679
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mpm@selenic.com
parents:
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342 memcpy(rb, encode, 12); |
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mpm@selenic.com
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343 memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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344 rb += 12 + len; |
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mpm@selenic.com
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345 } |
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mpm@selenic.com
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346 la = h->a2; |
8b067bde6679
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mpm@selenic.com
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347 lb = h->b2; |
8b067bde6679
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mpm@selenic.com
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348 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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349 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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350 nomem: |
8b067bde6679
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mpm@selenic.com
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351 free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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352 free(bl); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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353 free(l.base); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
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354 return result ? result : PyErr_NoMemory(); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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355 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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356 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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357 static char mdiff_doc[] = "Efficient binary diff."; |
8b067bde6679
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mpm@selenic.com
parents:
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changeset
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358 |
8b067bde6679
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mpm@selenic.com
parents:
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359 static PyMethodDef methods[] = { |
8b067bde6679
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mpm@selenic.com
parents:
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changeset
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360 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
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361 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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362 {NULL, NULL} |
8b067bde6679
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mpm@selenic.com
parents:
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363 }; |
8b067bde6679
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mpm@selenic.com
parents:
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changeset
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364 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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365 PyMODINIT_FUNC initbdiff(void) |
8b067bde6679
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mpm@selenic.com
parents:
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366 { |
8b067bde6679
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mpm@selenic.com
parents:
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changeset
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367 Py_InitModule3("bdiff", methods, mdiff_doc); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
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changeset
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368 } |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
369 |