Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/bdiff.c @ 4131:1ca664c964e0

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don't return uninitialized memory from bdiff.blocks() bdiff.blocks() returns a dummy match at the end of both files; the length of that chunk is never set, so it will sometimes contain random heap garbage. There are apparently workarounds for this elsewhere: # bdiff sometimes gives huge matches past eof, this check eats them,
author Erling Ellingsen <erlingalf@gmail.com>
date Tue, 20 Feb 2007 22:20:16 +0100
parents 8c617d48564a
children 9dc64c8414ca
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1 /*
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2 bdiff.c - efficient binary diff extension for Mercurial
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3
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4 Copyright 2005, 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
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21 #ifdef _MSC_VER
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22 #define inline __inline
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23 typedef unsigned long uint32_t;
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24 #else
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25 #include <stdint.h>
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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
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45 struct pos {
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46 int pos, len;
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47 };
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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 {
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115 int i, j, buckets = 1, t;
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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;
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124 if (!h)
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125 return 0;
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126
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127 /* clear the hash table */
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128 for (i = 0; i <= buckets; i++) {
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129 h[i].pos = -1;
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130 h[i].len = 0;
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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 */
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136 for (j = b[i].h & buckets; h[j].pos != -1;
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137 j = (j + 1) & buckets)
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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 */
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142 b[i].n = h[j].pos;
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143 b[i].e = j;
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144 h[j].pos = i;
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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 */
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154 for (j = a[i].h & buckets; h[j].pos != -1;
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155 j = (j + 1) & buckets)
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156 if (!cmp(a + i, b + h[j].pos))
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8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
157 break;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
158
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
159 a[i].e = j; /* use equivalence class for quick compare */
1542
8e80eefb3de6 made C src formatting more consistent
twaldmann@thinkmo.de
parents: 1397
diff changeset
160 if (h[j].len <= t)
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
161 a[i].n = h[j].pos; /* point to head of match list */
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
162 else
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
163 a[i].n = -1; /* too popular */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
164 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
165
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
166 /* discard hash tables */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
167 free(h);
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
168 return 1;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
169 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
170
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
171 static int longest_match(struct line *a, struct line *b, struct pos *pos,
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
172 int a1, int a2, int b1, int b2, int *omi, int *omj)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
173 {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
174 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
175
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
176 for (i = a1; i < a2; i++) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
177 /* skip things before the current block */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
178 for (j = a[i].n; j != -1 && j < b1; j = b[j].n)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
179 ;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
180
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
181 /* loop through all lines match a[i] in b */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
182 for (; j != -1 && j < b2; j = b[j].n) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
183 /* does this extend an earlier match? */
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
184 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1)
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
185 k = pos[j - 1].len + 1;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
186 else
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
187 k = 1;
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
188 pos[j].pos = i;
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
189 pos[j].len = k;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
190
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
191 /* best match so far? */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
192 if (k > mk) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
193 mi = i;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
194 mj = j;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
195 mk = k;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
196 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
197 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
198 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
199
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
200 if (mk) {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
201 mi = mi - mk + 1;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
202 mj = mj - mk + 1;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
203 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
204
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
205 /* expand match to include neighboring popular lines */
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
206 while (mi - mb > a1 && mj - mb > b1 &&
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
207 a[mi - mb - 1].e == b[mj - mb - 1].e)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
208 mb++;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
209 while (mi + mk < a2 && mj + mk < b2 &&
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
210 a[mi + mk].e == b[mj + mk].e)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
211 mk++;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
212
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
213 *omi = mi - mb;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
214 *omj = mj - mb;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
215 return mk + mb;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
216 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
217
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
218 static void recurse(struct line *a, struct line *b, struct pos *pos,
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
219 int a1, int a2, int b1, int b2, struct hunklist *l)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
220 {
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
221 int i, j, k;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
222
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
223 /* find the longest match in this chunk */
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
224 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
225 if (!k)
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
226 return;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
227
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
228 /* and recurse on the remaining chunks on either side */
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
229 recurse(a, b, pos, a1, i, b1, j, l);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
230 l->head->a1 = i;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
231 l->head->a2 = i + k;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
232 l->head->b1 = j;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
233 l->head->b2 = j + k;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
234 l->head++;
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
235 recurse(a, b, pos, i + k, a2, j + k, b2, l);
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
236 }
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
237
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
238 static struct hunklist diff(struct line *a, int an, struct line *b, int bn)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
239 {
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
240 struct hunklist l;
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
241 struct pos *pos;
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
242 int t;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
243
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
244 /* allocate and fill arrays */
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
245 t = equatelines(a, an, b, bn);
1978
10606ee61107 do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents: 1759
diff changeset
246 pos = (struct pos *)calloc(bn, sizeof(struct pos));
827
a61728b58dc0 Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents: 597
diff changeset
247 /* we can't have more matches than lines in the shorter file */
1978
10606ee61107 do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents: 1759
diff changeset
248 l.head = l.base = (struct hunk *)malloc(sizeof(struct hunk) *
10606ee61107 do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents: 1759
diff changeset
249 ((an<bn ? an:bn) + 1));
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
250
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
251 if (pos && l.base && t) {
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
252 /* generate the matching block list */
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
253 recurse(a, b, pos, 0, an, 0, bn, &l);
4131
1ca664c964e0 don't return uninitialized memory from bdiff.blocks()
Erling Ellingsen <erlingalf@gmail.com>
parents: 3547
diff changeset
254 l.head->a1 = l.head->a2 = an;
1ca664c964e0 don't return uninitialized memory from bdiff.blocks()
Erling Ellingsen <erlingalf@gmail.com>
parents: 3547
diff changeset
255 l.head->b1 = l.head->b2 = bn;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
256 l.head++;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
257 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
258
474
b2ae8283d1a6 Minor speed improvements for bdiff
mpm@selenic.com
parents: 472
diff changeset
259 free(pos);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
260 return l;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
261 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
262
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
263 static PyObject *blocks(PyObject *self, PyObject *args)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
264 {
435
e731d25ddab2 Fix a compile warning for bdiff
mpm@selenic.com
parents: 433
diff changeset
265 PyObject *sa, *sb, *rl = NULL, *m;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
266 struct line *a, *b;
970
bf375e93073b Fix possible unitialized variable warnings
mpm@selenic.com
parents: 896
diff changeset
267 struct hunklist l = {NULL, NULL};
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
268 struct hunk *h;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
269 int an, bn, pos = 0;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
270
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
271 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb))
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
272 return NULL;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
273
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
274 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
275 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
276 if (!a || !b)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
277 goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
278
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
279 l = diff(a, an, b, bn);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
280 rl = PyList_New(l.head - l.base);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
281 if (!l.head || !rl)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
282 goto nomem;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
283
1542
8e80eefb3de6 made C src formatting more consistent
twaldmann@thinkmo.de
parents: 1397
diff changeset
284 for (h = l.base; h != l.head; h++) {
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
285 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
286 PyList_SetItem(rl, pos, m);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
287 pos++;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
288 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
289
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
290 nomem:
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
291 free(a);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
292 free(b);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
293 free(l.base);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
294 return rl ? rl : PyErr_NoMemory();
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
295 }
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
296
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
297 static PyObject *bdiff(PyObject *self, PyObject *args)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
298 {
3333
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2858
diff changeset
299 char *sa, *sb;
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2858
diff changeset
300 PyObject *result = NULL;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
301 struct line *al, *bl;
970
bf375e93073b Fix possible unitialized variable warnings
mpm@selenic.com
parents: 896
diff changeset
302 struct hunklist l = {NULL, NULL};
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
303 struct hunk *h;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
304 char encode[12], *rb;
3333
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2858
diff changeset
305 int an, bn, len = 0, la, lb;
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
306
3369
4bad632913d8 python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents: 3333
diff changeset
307 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
308 return NULL;
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
309
3333
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2858
diff changeset
310 an = splitlines(sa, la, &al);
9061613c1593 Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents: 2858
diff changeset
311 bn = splitlines(sb, lb, &bl);
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
312 if (!al || !bl)
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
313 goto nomem;
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
314
433
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
315 l = diff(al, an, bl, bn);
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
316 if (!l.head)
79c694462294 Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents: 411
diff changeset
317 goto nomem;
400
8b067bde6679 Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff changeset
318
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319 /* calculate length of output */
3333
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320 la = lb = 0;
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321 for (h = l.base; h != l.head; h++) {
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322 if (h->a1 != la || h->b1 != lb)
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323 len += 12 + bl[h->b1].l - bl[lb].l;
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324 la = h->a2;
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325 lb = h->b2;
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326 }
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327
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328 result = PyString_FromStringAndSize(NULL, len);
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329 if (!result)
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330 goto nomem;
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331
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332 /* build binary patch */
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333 rb = PyString_AsString(result);
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334 la = lb = 0;
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335
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336 for (h = l.base; h != l.head; h++) {
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337 if (h->a1 != la || h->b1 != lb) {
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338 len = bl[h->b1].l - bl[lb].l;
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339 *(uint32_t *)(encode) = htonl(al[la].l - al->l);
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340 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l);
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341 *(uint32_t *)(encode + 8) = htonl(len);
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342 memcpy(rb, encode, 12);
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343 memcpy(rb + 12, bl[lb].l, len);
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344 rb += 12 + len;
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345 }
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346 la = h->a2;
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347 lb = h->b2;
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348 }
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349
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350 nomem:
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351 free(al);
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352 free(bl);
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353 free(l.base);
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354 return result ? result : PyErr_NoMemory();
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355 }
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356
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357 static char mdiff_doc[] = "Efficient binary diff.";
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358
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359 static PyMethodDef methods[] = {
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360 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"},
433
79c694462294 Add bdiff.blocks / minor performance tweaks
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361 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"},
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362 {NULL, NULL}
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363 };
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364
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365 PyMODINIT_FUNC initbdiff(void)
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366 {
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367 Py_InitModule3("bdiff", methods, mdiff_doc);
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368 }
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369