Mercurial > hg
annotate mercurial/bdiff.c @ 24066:afdf5f6ab37a
pager: set an attribute on ui indicating that a pager is active
A subsequent patch will teach the color extension to do different things
depending on whether a pager is active. This patch leaves a breadcrumb
on the ui instance to allow it do that that.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 06 Feb 2015 12:07:56 -0800 |
parents | 66b21ce60a19 |
children | e868d8ee7c8f |
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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 #define PY_SSIZE_T_CLEAN |
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13 #include <Python.h> |
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14 #include <stdlib.h> |
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15 #include <string.h> |
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16 #include <limits.h> |
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17 |
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18 #include "util.h" |
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19 |
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20 struct line { |
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21 int hash, n, e; |
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22 Py_ssize_t len; |
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23 const char *l; |
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24 }; |
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25 |
474 | 26 struct pos { |
27 int pos, len; | |
28 }; | |
29 | |
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30 struct hunk; |
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31 struct hunk { |
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32 int a1, a2, b1, b2; |
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33 struct hunk *next; |
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34 }; |
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35 |
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36 static int splitlines(const char *a, Py_ssize_t len, struct line **lr) |
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37 { |
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38 unsigned hash; |
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39 int i; |
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40 const char *p, *b = a; |
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41 const char * const plast = a + len - 1; |
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42 struct line *l; |
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43 |
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44 /* count the lines */ |
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45 i = 1; /* extra line for sentinel */ |
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46 for (p = a; p < a + len; p++) |
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47 if (*p == '\n' || p == plast) |
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48 i++; |
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49 |
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50 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
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51 if (!l) |
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52 return -1; |
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53 |
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54 /* build the line array and calculate hashes */ |
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55 hash = 0; |
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56 for (p = a; p < a + len; p++) { |
5342 | 57 /* Leonid Yuriev's hash */ |
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58 hash = (hash * 1664525) + (unsigned char)*p + 1013904223; |
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60 if (*p == '\n' || p == plast) { |
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61 l->hash = hash; |
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62 hash = 0; |
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63 l->len = p - b + 1; |
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64 l->l = b; |
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65 l->n = INT_MAX; |
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66 l++; |
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67 b = p + 1; |
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68 } |
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69 } |
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70 |
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71 /* set up a sentinel */ |
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72 l->hash = 0; |
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73 l->len = 0; |
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74 l->l = a + len; |
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75 return i - 1; |
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76 } |
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77 |
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78 static inline int cmp(struct line *a, struct line *b) |
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79 { |
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80 return a->hash != b->hash || a->len != b->len || memcmp(a->l, b->l, a->len); |
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81 } |
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82 |
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83 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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84 { |
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85 int i, j, buckets = 1, t, scale; |
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86 struct pos *h = NULL; |
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87 |
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88 /* build a hash table of the next highest power of 2 */ |
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89 while (buckets < bn + 1) |
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90 buckets *= 2; |
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91 |
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92 /* try to allocate a large hash table to avoid collisions */ |
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93 for (scale = 4; scale; scale /= 2) { |
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94 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos)); |
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95 if (h) |
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96 break; |
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97 } |
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474 | 99 if (!h) |
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100 return 0; |
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101 |
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102 buckets = buckets * scale - 1; |
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103 |
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104 /* clear the hash table */ |
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106 h[i].pos = INT_MAX; |
474 | 107 h[i].len = 0; |
108 } | |
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109 |
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110 /* add lines to the hash table chains */ |
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111 for (i = bn - 1; i >= 0; i--) { |
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112 /* find the equivalence class */ |
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113 for (j = b[i].hash & buckets; h[j].pos != INT_MAX; |
474 | 114 j = (j + 1) & buckets) |
115 if (!cmp(b + i, b + h[j].pos)) | |
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116 break; |
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117 |
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118 /* add to the head of the equivalence class */ |
474 | 119 b[i].n = h[j].pos; |
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120 b[i].e = j; |
474 | 121 h[j].pos = i; |
122 h[j].len++; /* keep track of popularity */ | |
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123 } |
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124 |
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125 /* compute popularity threshold */ |
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126 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1); |
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127 |
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128 /* match items in a to their equivalence class in b */ |
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129 for (i = 0; i < an; i++) { |
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130 /* find the equivalence class */ |
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131 for (j = a[i].hash & buckets; h[j].pos != INT_MAX; |
474 | 132 j = (j + 1) & buckets) |
133 if (!cmp(a + i, b + h[j].pos)) | |
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134 break; |
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135 |
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136 a[i].e = j; /* use equivalence class for quick compare */ |
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137 if (h[j].len <= t) |
474 | 138 a[i].n = h[j].pos; /* point to head of match list */ |
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139 else |
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140 a[i].n = INT_MAX; /* too popular */ |
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141 } |
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142 |
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143 /* discard hash tables */ |
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144 free(h); |
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145 return 1; |
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146 } |
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147 |
474 | 148 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
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149 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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150 { |
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151 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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152 |
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153 for (i = a1; i < a2; i++) { |
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154 /* skip things before the current block */ |
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155 for (j = a[i].n; j < b1; j = b[j].n) |
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156 ; |
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157 |
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158 /* loop through all lines match a[i] in b */ |
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159 for (; j < b2; j = b[j].n) { |
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160 /* does this extend an earlier match? */ |
474 | 161 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
162 k = pos[j - 1].len + 1; | |
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163 else |
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164 k = 1; |
474 | 165 pos[j].pos = i; |
166 pos[j].len = k; | |
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167 |
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168 /* best match so far? */ |
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169 if (k > mk) { |
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170 mi = i; |
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171 mj = j; |
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172 mk = k; |
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173 } |
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174 } |
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175 } |
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176 |
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177 if (mk) { |
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178 mi = mi - mk + 1; |
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179 mj = mj - mk + 1; |
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180 } |
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181 |
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182 /* expand match to include neighboring popular lines */ |
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183 while (mi - mb > a1 && mj - mb > b1 && |
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184 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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185 mb++; |
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186 while (mi + mk < a2 && mj + mk < b2 && |
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187 a[mi + mk].e == b[mj + mk].e) |
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188 mk++; |
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189 |
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190 *omi = mi - mb; |
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191 *omj = mj - mb; |
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192 |
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193 return mk + mb; |
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194 } |
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195 |
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196 static struct hunk *recurse(struct line *a, struct line *b, struct pos *pos, |
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197 int a1, int a2, int b1, int b2, struct hunk *l) |
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198 { |
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199 int i, j, k; |
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200 |
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201 while (1) { |
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202 /* find the longest match in this chunk */ |
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203 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
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204 if (!k) |
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205 return l; |
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206 |
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207 /* and recurse on the remaining chunks on either side */ |
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208 l = recurse(a, b, pos, a1, i, b1, j, l); |
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209 if (!l) |
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210 return NULL; |
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211 |
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212 l->next = (struct hunk *)malloc(sizeof(struct hunk)); |
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213 if (!l->next) |
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214 return NULL; |
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215 |
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216 l = l->next; |
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217 l->a1 = i; |
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218 l->a2 = i + k; |
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219 l->b1 = j; |
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220 l->b2 = j + k; |
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221 l->next = NULL; |
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222 |
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223 /* tail-recursion didn't happen, so do equivalent iteration */ |
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224 a1 = i + k; |
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225 b1 = j + k; |
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226 } |
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227 } |
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228 |
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229 static int diff(struct line *a, int an, struct line *b, int bn, |
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230 struct hunk *base) |
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231 { |
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232 struct hunk *curr; |
474 | 233 struct pos *pos; |
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234 int t, count = 0; |
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235 |
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236 /* allocate and fill arrays */ |
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237 t = equatelines(a, an, b, bn); |
5571 | 238 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos)); |
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239 |
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240 if (pos && t) { |
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241 /* generate the matching block list */ |
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242 |
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243 curr = recurse(a, b, pos, 0, an, 0, bn, base); |
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244 if (!curr) |
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245 return -1; |
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246 |
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247 /* sentinel end hunk */ |
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248 curr->next = (struct hunk *)malloc(sizeof(struct hunk)); |
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249 if (!curr->next) |
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250 return -1; |
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251 curr = curr->next; |
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252 curr->a1 = curr->a2 = an; |
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253 curr->b1 = curr->b2 = bn; |
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254 curr->next = NULL; |
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255 } |
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256 |
474 | 257 free(pos); |
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258 |
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259 /* normalize the hunk list, try to push each hunk towards the end */ |
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260 for (curr = base->next; curr; curr = curr->next) { |
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261 struct hunk *next = curr->next; |
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262 int shift = 0; |
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263 |
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264 if (!next) |
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265 break; |
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266 |
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267 if (curr->a2 == next->a1) |
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268 while (curr->a2 + shift < an && curr->b2 + shift < bn |
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269 && !cmp(a + curr->a2 + shift, |
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270 b + curr->b2 + shift)) |
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271 shift++; |
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272 else if (curr->b2 == next->b1) |
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273 while (curr->b2 + shift < bn && curr->a2 + shift < an |
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274 && !cmp(b + curr->b2 + shift, |
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275 a + curr->a2 + shift)) |
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276 shift++; |
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277 if (!shift) |
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278 continue; |
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changeset
|
279 curr->b2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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changeset
|
280 next->b1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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changeset
|
281 curr->a2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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changeset
|
282 next->a1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
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|
283 } |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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|
284 |
13089
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285 for (curr = base->next; curr; curr = curr->next) |
faee0ffbc24b
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changeset
|
286 count++; |
faee0ffbc24b
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11364
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|
287 return count; |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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|
288 } |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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changeset
|
289 |
faee0ffbc24b
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changeset
|
290 static void freehunks(struct hunk *l) |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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changeset
|
291 { |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
292 struct hunk *n; |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
293 for (; l; l = n) { |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
294 n = l->next; |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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|
295 free(l); |
faee0ffbc24b
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|
296 } |
433
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297 } |
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298 |
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|
299 static PyObject *blocks(PyObject *self, PyObject *args) |
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|
300 { |
435 | 301 PyObject *sa, *sb, *rl = NULL, *m; |
433
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Add bdiff.blocks / minor performance tweaks
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|
302 struct line *a, *b; |
13089
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Matt Mackall <mpm@selenic.com>
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changeset
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303 struct hunk l, *h; |
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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changeset
|
304 int an, bn, count, pos = 0; |
400
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Add a fast binary diff extension (not yet used)
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305 |
19962
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Matt Mackall <mpm@selenic.com>
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306 l.next = NULL; |
66b21ce60a19
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307 |
400
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308 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
8b067bde6679
Add a fast binary diff extension (not yet used)
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309 return NULL; |
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Add a fast binary diff extension (not yet used)
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310 |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
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10500
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|
311 an = splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
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10500
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changeset
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312 bn = splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
0044193a1c45
bdiff.c: Added support for py3k.
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313 |
433
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314 if (!a || !b) |
79c694462294
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315 goto nomem; |
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316 |
13089
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317 count = diff(a, an, b, bn, &l); |
faee0ffbc24b
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318 if (count < 0) |
433
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319 goto nomem; |
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changeset
|
320 |
13089
faee0ffbc24b
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Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
321 rl = PyList_New(count); |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
322 if (!rl) |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
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changeset
|
323 goto nomem; |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
324 |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
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11364
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changeset
|
325 for (h = l.next; h; h = h->next) { |
433
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Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
326 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
79c694462294
Add bdiff.blocks / minor performance tweaks
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411
diff
changeset
|
327 PyList_SetItem(rl, pos, m); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
328 pos++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
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diff
changeset
|
329 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
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411
diff
changeset
|
330 |
79c694462294
Add bdiff.blocks / minor performance tweaks
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parents:
411
diff
changeset
|
331 nomem: |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
332 free(a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
333 free(b); |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
334 freehunks(l.next); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
335 return rl ? rl : PyErr_NoMemory(); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
336 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
337 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
338 static PyObject *bdiff(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
339 { |
15222
73015301db86
bdiff: fix pointer aliasing
Matt Mackall <mpm@selenic.com>
parents:
13732
diff
changeset
|
340 char *sa, *sb, *rb; |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
341 PyObject *result = NULL; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
342 struct line *al, *bl; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
343 struct hunk l, *h; |
16749
eab8ca175262
bdiff: use Py_ssize_t instead of int
Adrian Buehlmann <adrian@cadifra.com>
parents:
16477
diff
changeset
|
344 int an, bn, count; |
eab8ca175262
bdiff: use Py_ssize_t instead of int
Adrian Buehlmann <adrian@cadifra.com>
parents:
16477
diff
changeset
|
345 Py_ssize_t len = 0, la, lb; |
16477
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
346 PyThreadState *_save; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
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411
diff
changeset
|
347 |
19962
66b21ce60a19
bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents:
18551
diff
changeset
|
348 l.next = NULL; |
66b21ce60a19
bdiff: avoid a memory error on malloc failure
Matt Mackall <mpm@selenic.com>
parents:
18551
diff
changeset
|
349 |
3369
4bad632913d8
python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
3335
diff
changeset
|
350 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
|
351 return NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
352 |
18551
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
353 if (la > UINT_MAX || lb > UINT_MAX) { |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
354 PyErr_SetString(PyExc_ValueError, "bdiff inputs too large"); |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
355 return NULL; |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
356 } |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
357 |
16477
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
358 _save = PyEval_SaveThread(); |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
359 an = splitlines(sa, la, &al); |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
360 bn = splitlines(sb, lb, &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
361 if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
362 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
363 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
364 count = diff(al, an, bl, bn, &l); |
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
365 if (count < 0) |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
366 goto nomem; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
367 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
368 /* calculate length of output */ |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
369 la = lb = 0; |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
370 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
|
371 if (h->a1 != la || h->b1 != lb) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
372 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
|
373 la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
374 lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
375 } |
16477
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
376 PyEval_RestoreThread(_save); |
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
377 _save = NULL; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
378 |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
379 result = PyBytes_FromStringAndSize(NULL, len); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
380 |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
381 if (!result) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
382 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
383 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
384 /* build binary patch */ |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
385 rb = PyBytes_AsString(result); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
386 la = lb = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
387 |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
388 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
|
389 if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
390 len = bl[h->b1].l - bl[lb].l; |
18551
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
391 putbe32((uint32_t)(al[la].l - al->l), rb); |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
392 putbe32((uint32_t)(al[h->a1].l - al->l), rb + 4); |
d6fb7bbec16a
bdiff: simplify overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16750
diff
changeset
|
393 putbe32((uint32_t)len, rb + 8); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
394 memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
395 rb += 12 + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
396 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
397 la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
398 lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
399 } |
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 nomem: |
16477
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
402 if (_save) |
70b5e25f1598
bdiff.bdiff: release the GIL before doing expensive diff operations
Augie Fackler <raf@durin42.com>
parents:
16437
diff
changeset
|
403 PyEval_RestoreThread(_save); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
404 free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
405 free(bl); |
13089
faee0ffbc24b
bdiff: dynamically allocate hunks
Matt Mackall <mpm@selenic.com>
parents:
11364
diff
changeset
|
406 freehunks(l.next); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
407 return result ? result : PyErr_NoMemory(); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
408 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
409 |
15530
eeac5e179243
mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents:
15222
diff
changeset
|
410 /* |
eeac5e179243
mdiff: replace wscleanup() regexps with C loops
Patrick Mezard <pmezard@gmail.com>
parents:
15222
diff
changeset
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411 * If allws != 0, remove all whitespace (' ', \t and \r). Otherwise, |
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412 * reduce whitespace sequences to a single space and trim remaining whitespace |
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413 * from end of lines. |
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414 */ |
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415 static PyObject *fixws(PyObject *self, PyObject *args) |
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416 { |
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417 PyObject *s, *result = NULL; |
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418 char allws, c; |
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419 const char *r; |
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420 Py_ssize_t i, rlen, wlen = 0; |
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421 char *w; |
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422 |
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423 if (!PyArg_ParseTuple(args, "Sb:fixws", &s, &allws)) |
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424 return NULL; |
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425 r = PyBytes_AsString(s); |
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426 rlen = PyBytes_Size(s); |
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427 |
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428 w = (char *)malloc(rlen ? rlen : 1); |
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429 if (!w) |
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430 goto nomem; |
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431 |
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432 for (i = 0; i != rlen; i++) { |
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433 c = r[i]; |
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434 if (c == ' ' || c == '\t' || c == '\r') { |
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435 if (!allws && (wlen == 0 || w[wlen - 1] != ' ')) |
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436 w[wlen++] = ' '; |
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437 } else if (c == '\n' && !allws |
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438 && wlen > 0 && w[wlen - 1] == ' ') { |
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439 w[wlen - 1] = '\n'; |
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440 } else { |
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441 w[wlen++] = c; |
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442 } |
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443 } |
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444 |
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445 result = PyBytes_FromStringAndSize(w, wlen); |
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446 |
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447 nomem: |
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448 free(w); |
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449 return result ? result : PyErr_NoMemory(); |
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450 } |
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451 |
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452 |
400
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453 static char mdiff_doc[] = "Efficient binary diff."; |
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454 |
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455 static PyMethodDef methods[] = { |
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456 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
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457 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
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458 {"fixws", fixws, METH_VARARGS, "normalize diff whitespaces\n"}, |
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459 {NULL, NULL} |
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460 }; |
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461 |
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462 #ifdef IS_PY3K |
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463 static struct PyModuleDef bdiff_module = { |
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464 PyModuleDef_HEAD_INIT, |
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465 "bdiff", |
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466 mdiff_doc, |
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467 -1, |
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468 methods |
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469 }; |
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470 |
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471 PyMODINIT_FUNC PyInit_bdiff(void) |
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472 { |
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473 return PyModule_Create(&bdiff_module); |
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474 } |
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475 #else |
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476 PyMODINIT_FUNC initbdiff(void) |
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477 { |
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478 Py_InitModule3("bdiff", methods, mdiff_doc); |
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479 } |
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480 #endif |
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481 |