Mercurial > hg
annotate mercurial/bdiff.c @ 13297:613b8bd2284e
specify C indention style using Emacs file local variables
author | Martin Geisler <mg@aragost.com> |
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date | Wed, 26 Jan 2011 12:05:01 +0100 |
parents | c73745762f33 |
children | a4e0908ce35b |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
2859 | 4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 |
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9 Based roughly on Python difflib |
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10 */ |
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11 |
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12 #include <Python.h> |
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13 #include <stdlib.h> |
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14 #include <string.h> |
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15 #include <limits.h> |
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16 |
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17 #if defined __hpux || defined __SUNPRO_C || defined _AIX |
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18 #define inline |
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19 #endif |
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20 |
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21 #ifdef __linux |
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22 #define inline __inline |
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23 #endif |
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24 |
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25 #ifdef _WIN32 |
551 | 26 #ifdef _MSC_VER |
27 #define inline __inline | |
28 typedef unsigned long uint32_t; | |
29 #else | |
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30 #include <stdint.h> |
551 | 31 #endif |
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32 static uint32_t htonl(uint32_t x) |
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33 { |
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34 return ((x & 0x000000ffUL) << 24) | |
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35 ((x & 0x0000ff00UL) << 8) | |
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36 ((x & 0x00ff0000UL) >> 8) | |
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37 ((x & 0xff000000UL) >> 24); |
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38 } |
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39 #else |
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40 #include <sys/types.h> |
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41 #if defined __BEOS__ && !defined __HAIKU__ |
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42 #include <ByteOrder.h> |
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43 #else |
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44 #include <arpa/inet.h> |
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45 #endif |
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46 #include <inttypes.h> |
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47 #endif |
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48 |
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49 #include "util.h" |
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50 |
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51 struct line { |
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52 int h, len, n, e; |
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53 const char *l; |
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54 }; |
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55 |
474 | 56 struct pos { |
57 int pos, len; | |
58 }; | |
59 | |
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60 struct hunk; |
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61 struct hunk { |
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62 int a1, a2, b1, b2; |
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63 struct hunk *next; |
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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 { |
5342 | 68 int h, i; |
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69 const char *p, *b = a; |
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70 const char * const plast = a + len - 1; |
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71 struct line *l; |
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72 |
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73 /* count the lines */ |
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74 i = 1; /* extra line for sentinel */ |
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75 for (p = a; p < a + len; p++) |
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76 if (*p == '\n' || p == plast) |
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77 i++; |
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78 |
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79 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
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80 if (!l) |
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81 return -1; |
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82 |
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83 /* build the line array and calculate hashes */ |
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84 h = 0; |
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85 for (p = a; p < a + len; p++) { |
5342 | 86 /* Leonid Yuriev's hash */ |
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87 h = (h * 1664525) + *p + 1013904223; |
5342 | 88 |
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89 if (*p == '\n' || p == plast) { |
5342 | 90 l->h = h; |
91 h = 0; | |
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92 l->len = p - b + 1; |
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93 l->l = b; |
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94 l->n = INT_MAX; |
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95 l++; |
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96 b = p + 1; |
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97 } |
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98 } |
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99 |
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100 /* set up a sentinel */ |
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101 l->h = l->len = 0; |
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102 l->l = a + len; |
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103 return i - 1; |
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104 } |
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105 |
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106 int inline cmp(struct line *a, struct line *b) |
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107 { |
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108 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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109 } |
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110 |
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111 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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112 { |
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113 int i, j, buckets = 1, t, scale; |
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114 struct pos *h = NULL; |
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115 |
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116 /* build a hash table of the next highest power of 2 */ |
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117 while (buckets < bn + 1) |
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118 buckets *= 2; |
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119 |
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120 /* try to allocate a large hash table to avoid collisions */ |
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121 for (scale = 4; scale; scale /= 2) { |
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122 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos)); |
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123 if (h) |
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124 break; |
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125 } |
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126 |
474 | 127 if (!h) |
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128 return 0; |
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129 |
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130 buckets = buckets * scale - 1; |
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131 |
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132 /* clear the hash table */ |
474 | 133 for (i = 0; i <= buckets; i++) { |
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134 h[i].pos = INT_MAX; |
474 | 135 h[i].len = 0; |
136 } | |
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137 |
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138 /* add lines to the hash table chains */ |
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139 for (i = bn - 1; i >= 0; i--) { |
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140 /* find the equivalence class */ |
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141 for (j = b[i].h & buckets; h[j].pos != INT_MAX; |
474 | 142 j = (j + 1) & buckets) |
143 if (!cmp(b + i, b + h[j].pos)) | |
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144 break; |
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145 |
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146 /* add to the head of the equivalence class */ |
474 | 147 b[i].n = h[j].pos; |
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148 b[i].e = j; |
474 | 149 h[j].pos = i; |
150 h[j].len++; /* keep track of popularity */ | |
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151 } |
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152 |
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153 /* compute popularity threshold */ |
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154 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1); |
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155 |
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156 /* match items in a to their equivalence class in b */ |
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157 for (i = 0; i < an; i++) { |
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158 /* find the equivalence class */ |
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159 for (j = a[i].h & buckets; h[j].pos != INT_MAX; |
474 | 160 j = (j + 1) & buckets) |
161 if (!cmp(a + i, b + h[j].pos)) | |
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162 break; |
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163 |
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164 a[i].e = j; /* use equivalence class for quick compare */ |
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165 if (h[j].len <= t) |
474 | 166 a[i].n = h[j].pos; /* point to head of match list */ |
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167 else |
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168 a[i].n = INT_MAX; /* too popular */ |
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169 } |
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170 |
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171 /* discard hash tables */ |
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172 free(h); |
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173 return 1; |
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174 } |
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175 |
474 | 176 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
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177 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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178 { |
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179 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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180 |
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181 for (i = a1; i < a2; i++) { |
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182 /* skip things before the current block */ |
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183 for (j = a[i].n; j < b1; j = b[j].n) |
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184 ; |
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185 |
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186 /* loop through all lines match a[i] in b */ |
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187 for (; j < b2; j = b[j].n) { |
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188 /* does this extend an earlier match? */ |
474 | 189 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
190 k = pos[j - 1].len + 1; | |
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191 else |
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192 k = 1; |
474 | 193 pos[j].pos = i; |
194 pos[j].len = k; | |
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195 |
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196 /* best match so far? */ |
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197 if (k > mk) { |
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198 mi = i; |
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199 mj = j; |
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200 mk = k; |
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201 } |
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202 } |
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203 } |
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204 |
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205 if (mk) { |
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206 mi = mi - mk + 1; |
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207 mj = mj - mk + 1; |
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208 } |
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209 |
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210 /* expand match to include neighboring popular lines */ |
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211 while (mi - mb > a1 && mj - mb > b1 && |
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212 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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213 mb++; |
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214 while (mi + mk < a2 && mj + mk < b2 && |
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215 a[mi + mk].e == b[mj + mk].e) |
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216 mk++; |
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217 |
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218 *omi = mi - mb; |
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219 *omj = mj - mb; |
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220 |
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221 return mk + mb; |
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222 } |
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223 |
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224 static struct hunk *recurse(struct line *a, struct line *b, struct pos *pos, |
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225 int a1, int a2, int b1, int b2, struct hunk *l) |
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226 { |
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227 int i, j, k; |
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228 |
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229 while (1) { |
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230 /* find the longest match in this chunk */ |
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231 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
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232 if (!k) |
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233 return l; |
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234 |
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235 /* and recurse on the remaining chunks on either side */ |
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236 l = recurse(a, b, pos, a1, i, b1, j, l); |
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237 if (!l) |
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238 return NULL; |
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239 |
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240 l->next = (struct hunk *)malloc(sizeof(struct hunk)); |
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241 if (!l->next) |
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242 return NULL; |
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243 |
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244 l = l->next; |
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245 l->a1 = i; |
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246 l->a2 = i + k; |
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247 l->b1 = j; |
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248 l->b2 = j + k; |
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249 l->next = NULL; |
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250 |
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251 /* tail-recursion didn't happen, so do equivalent iteration */ |
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252 a1 = i + k; |
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253 b1 = j + k; |
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254 } |
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255 } |
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256 |
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257 static int diff(struct line *a, int an, struct line *b, int bn, |
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258 struct hunk *base) |
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259 { |
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260 struct hunk *curr; |
474 | 261 struct pos *pos; |
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262 int t, count = 0; |
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263 |
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264 /* allocate and fill arrays */ |
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265 t = equatelines(a, an, b, bn); |
5571 | 266 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos)); |
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267 |
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268 if (pos && t) { |
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269 /* generate the matching block list */ |
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270 |
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271 curr = recurse(a, b, pos, 0, an, 0, bn, base); |
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272 if (!curr) |
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273 return -1; |
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274 |
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275 /* sentinel end hunk */ |
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276 curr->next = (struct hunk *)malloc(sizeof(struct hunk)); |
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277 if (!curr->next) |
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278 return -1; |
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279 curr = curr->next; |
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280 curr->a1 = curr->a2 = an; |
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281 curr->b1 = curr->b2 = bn; |
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282 curr->next = NULL; |
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283 } |
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284 |
474 | 285 free(pos); |
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286 |
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287 /* normalize the hunk list, try to push each hunk towards the end */ |
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288 for (curr = base->next; curr; curr = curr->next) { |
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289 struct hunk *next = curr->next; |
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290 int shift = 0; |
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291 |
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parents:
11364
diff
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|
292 if (!next) |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
293 break; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
294 |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
295 if (curr->a2 == next->a1) |
10282
08a0f04b56bd
many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents:
9534
diff
changeset
|
296 while (curr->a2 + shift < an && curr->b2 + shift < bn |
08a0f04b56bd
many, many trivial check-code fixups
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parents:
9534
diff
changeset
|
297 && !cmp(a + curr->a2 + shift, |
08a0f04b56bd
many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents:
9534
diff
changeset
|
298 b + curr->b2 + shift)) |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
299 shift++; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
300 else if (curr->b2 == next->b1) |
10282
08a0f04b56bd
many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents:
9534
diff
changeset
|
301 while (curr->b2 + shift < bn && curr->a2 + shift < an |
08a0f04b56bd
many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents:
9534
diff
changeset
|
302 && !cmp(b + curr->b2 + shift, |
08a0f04b56bd
many, many trivial check-code fixups
Matt Mackall <mpm@selenic.com>
parents:
9534
diff
changeset
|
303 a + curr->a2 + shift)) |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
304 shift++; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
305 if (!shift) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
306 continue; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
307 curr->b2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
308 next->b1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
309 curr->a2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
310 next->a1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
311 } |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
312 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
313 for (curr = base->next; curr; curr = curr->next) |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
314 count++; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
315 return count; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
316 } |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
317 |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
318 static void freehunks(struct hunk *l) |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
319 { |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
320 struct hunk *n; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
321 for (; l; l = n) { |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
322 n = l->next; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
323 free(l); |
faee0ffbc24b
bdiff: dynamically allocate hunks
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parents:
11364
diff
changeset
|
324 } |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
325 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
326 |
79c694462294
Add bdiff.blocks / minor performance tweaks
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411
diff
changeset
|
327 static PyObject *blocks(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
328 { |
435 | 329 PyObject *sa, *sb, *rl = NULL, *m; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
330 struct line *a, *b; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
331 struct hunk l, *h; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
332 int an, bn, count, pos = 0; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
333 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
334 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
335 return NULL; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
336 |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
337 an = splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
338 bn = splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
339 |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
340 if (!a || !b) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
341 goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
342 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
343 l.next = NULL; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
344 count = diff(a, an, b, bn, &l); |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
345 if (count < 0) |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
346 goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
347 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
348 rl = PyList_New(count); |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
349 if (!rl) |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
350 goto nomem; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
351 |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
352 for (h = l.next; h; h = h->next) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
353 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
354 PyList_SetItem(rl, pos, m); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
355 pos++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
356 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
357 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
358 nomem: |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
359 free(a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
360 free(b); |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
361 freehunks(l.next); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
362 return rl ? rl : PyErr_NoMemory(); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
363 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
364 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
365 static PyObject *bdiff(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
366 { |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
367 char *sa, *sb; |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
368 PyObject *result = NULL; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
369 struct line *al, *bl; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
370 struct hunk l, *h; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
371 char encode[12], *rb; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
372 int an, bn, len = 0, la, lb, count; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
373 |
3369
4bad632913d8
python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
3335
diff
changeset
|
374 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
375 return NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
376 |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
377 an = splitlines(sa, la, &al); |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
378 bn = splitlines(sb, lb, &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
379 if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
380 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
381 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
382 l.next = NULL; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
383 count = diff(al, an, bl, bn, &l); |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
384 if (count < 0) |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
385 goto nomem; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
386 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
387 /* calculate length of output */ |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
388 la = lb = 0; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
389 for (h = l.next; h; h = h->next) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
390 if (h->a1 != la || h->b1 != lb) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
391 len += 12 + bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
392 la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
393 lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
394 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
395 |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
396 result = PyBytes_FromStringAndSize(NULL, len); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
397 |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
398 if (!result) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
399 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
400 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
401 /* build binary patch */ |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
402 rb = PyBytes_AsString(result); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
403 la = lb = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
404 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
405 for (h = l.next; h; h = h->next) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
406 if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
407 len = bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
408 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
409 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
410 *(uint32_t *)(encode + 8) = htonl(len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
411 memcpy(rb, encode, 12); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
412 memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
413 rb += 12 + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
414 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
415 la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
416 lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
417 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
418 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
419 nomem: |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
420 free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
421 free(bl); |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
422 freehunks(l.next); |
400
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423 return result ? result : PyErr_NoMemory(); |
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424 } |
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425 |
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426 static char mdiff_doc[] = "Efficient binary diff."; |
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427 |
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428 static PyMethodDef methods[] = { |
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429 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
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430 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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431 {NULL, NULL} |
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432 }; |
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433 |
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434 #ifdef IS_PY3K |
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435 static struct PyModuleDef bdiff_module = { |
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436 PyModuleDef_HEAD_INIT, |
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437 "bdiff", |
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438 mdiff_doc, |
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439 -1, |
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440 methods |
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441 }; |
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442 |
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443 PyMODINIT_FUNC PyInit_bdiff(void) |
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444 { |
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445 return PyModule_Create(&bdiff_module); |
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446 } |
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447 #else |
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448 PyMODINIT_FUNC initbdiff(void) |
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449 { |
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450 Py_InitModule3("bdiff", methods, mdiff_doc); |
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451 } |
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452 #endif |
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453 |
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454 /* Local Variables: */ |
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455 /* c-file-style: "linux" */ |
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456 /* indent-tabs-mode: t */ |
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457 /* End: */ |