author | Thomas Arendsen Hein <thomas@intevation.de> |
Fri, 10 Mar 2006 11:34:02 +0100 | |
changeset 1876 | 2e0fd78587bd |
parent 1759 | 5afd459db177 |
child 1978 | 10606ee61107 |
permissions | -rw-r--r-- |
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/* |
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bdiff.c - efficient binary diff extension for Mercurial |
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|
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Copyright 2005 Matt Mackall <mpm@selenic.com> |
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|
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This software may be used and distributed according to the terms of |
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the GNU General Public License, incorporated herein by reference. |
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|
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Based roughly on Python difflib |
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*/ |
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|
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#include <Python.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#ifdef __hpux |
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#define inline |
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#endif |
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#ifdef __SUNPRO_C |
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# define inline |
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#endif |
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#ifdef _WIN32 |
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#ifdef _MSC_VER |
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#define inline __inline |
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typedef unsigned long uint32_t; |
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#else |
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#include <stdint.h> |
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#endif |
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static uint32_t htonl(uint32_t x) |
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{ |
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return ((x & 0x000000ffUL) << 24) | |
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((x & 0x0000ff00UL) << 8) | |
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((x & 0x00ff0000UL) >> 8) | |
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((x & 0xff000000UL) >> 24); |
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} |
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#else |
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#include <sys/types.h> |
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#include <arpa/inet.h> |
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#endif |
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struct line { |
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int h, len, n, e; |
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const char *l; |
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}; |
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474 | 48 |
struct pos { |
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int pos, len; |
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50 |
}; |
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51 |
||
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struct hunk { |
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int a1, a2, b1, b2; |
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}; |
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55 |
|
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struct hunklist { |
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57 |
struct hunk *base, *head; |
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58 |
}; |
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|
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static inline uint32_t rol32(uint32_t word, unsigned int shift) |
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{ |
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return (word << shift) | (word >> (32 - shift)); |
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63 |
} |
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64 |
|
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int splitlines(const char *a, int len, struct line **lr) |
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{ |
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int h, i; |
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const char *p, *b = a; |
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struct line *l; |
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70 |
|
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/* count the lines */ |
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i = 1; /* extra line for sentinel */ |
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73 |
for (p = a; p < a + len; p++) |
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if (*p == '\n' || p == a + len - 1) |
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i++; |
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76 |
|
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*lr = l = malloc(sizeof(struct line) * i); |
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if (!l) |
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return -1; |
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80 |
|
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/* build the line array and calculate hashes */ |
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82 |
h = 0; |
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83 |
for (p = a; p < a + len; p++) { |
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h = *p + rol32(h, 7); /* a simple hash from GNU diff */ |
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85 |
if (*p == '\n' || p == a + len - 1) { |
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l->len = p - b + 1; |
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l->h = h * l->len; |
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l->l = b; |
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l->n = -1; |
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90 |
l++; |
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91 |
b = p + 1; |
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h = 0; |
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93 |
} |
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94 |
} |
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95 |
|
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96 |
/* set up a sentinel */ |
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97 |
l->h = l->len = 0; |
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98 |
l->l = a + len; |
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99 |
return i - 1; |
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100 |
} |
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101 |
|
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102 |
int inline cmp(struct line *a, struct line *b) |
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103 |
{ |
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return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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105 |
} |
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106 |
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static int equatelines(struct line *a, int an, struct line *b, int bn) |
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108 |
{ |
474 | 109 |
int i, j, buckets = 1, t; |
110 |
struct pos *h; |
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111 |
|
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112 |
/* build a hash table of the next highest power of 2 */ |
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113 |
while (buckets < bn + 1) |
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114 |
buckets *= 2; |
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115 |
|
474 | 116 |
h = malloc(buckets * sizeof(struct pos)); |
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117 |
buckets = buckets - 1; |
474 | 118 |
if (!h) |
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119 |
return 0; |
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120 |
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121 |
/* clear the hash table */ |
474 | 122 |
for (i = 0; i <= buckets; i++) { |
123 |
h[i].pos = -1; |
|
124 |
h[i].len = 0; |
|
125 |
} |
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400
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126 |
|
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/* add lines to the hash table chains */ |
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128 |
for (i = bn - 1; i >= 0; i--) { |
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129 |
/* find the equivalence class */ |
474 | 130 |
for (j = b[i].h & buckets; h[j].pos != -1; |
131 |
j = (j + 1) & buckets) |
|
132 |
if (!cmp(b + i, b + h[j].pos)) |
|
400
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133 |
break; |
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134 |
|
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135 |
/* add to the head of the equivalence class */ |
474 | 136 |
b[i].n = h[j].pos; |
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b[i].e = j; |
474 | 138 |
h[j].pos = i; |
139 |
h[j].len++; /* keep track of popularity */ |
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400
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140 |
} |
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141 |
|
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142 |
/* compute popularity threshold */ |
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143 |
t = (bn >= 200) ? bn / 100 : bn + 1; |
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144 |
|
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/* match items in a to their equivalence class in b */ |
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146 |
for (i = 0; i < an; i++) { |
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147 |
/* find the equivalence class */ |
474 | 148 |
for (j = a[i].h & buckets; h[j].pos != -1; |
149 |
j = (j + 1) & buckets) |
|
150 |
if (!cmp(a + i, b + h[j].pos)) |
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400
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151 |
break; |
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152 |
|
433
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parents:
411
diff
changeset
|
153 |
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
|
154 |
if (h[j].len <= t) |
474 | 155 |
a[i].n = h[j].pos; /* point to head of match list */ |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
156 |
else |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
157 |
a[i].n = -1; /* too popular */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
158 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
159 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
160 |
/* discard hash tables */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
161 |
free(h); |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
162 |
return 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
163 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
164 |
|
474 | 165 |
static int longest_match(struct line *a, struct line *b, struct pos *pos, |
400
8b067bde6679
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parents:
diff
changeset
|
166 |
int a1, int a2, int b1, int b2, int *omi, int *omj) |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
167 |
{ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
168 |
int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
169 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
170 |
for (i = a1; i < a2; i++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
171 |
/* skip things before the current block */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
172 |
for (j = a[i].n; j != -1 && j < b1; j = b[j].n) |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
173 |
; |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
174 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
175 |
/* 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
|
176 |
for (; j != -1 && j < b2; j = b[j].n) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
177 |
/* does this extend an earlier match? */ |
474 | 178 |
if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
179 |
k = pos[j - 1].len + 1; |
|
400
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
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changeset
|
180 |
else |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
181 |
k = 1; |
474 | 182 |
pos[j].pos = i; |
183 |
pos[j].len = k; |
|
400
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
184 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
185 |
/* best match so far? */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
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parents:
diff
changeset
|
186 |
if (k > mk) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
187 |
mi = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
188 |
mj = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
189 |
mk = k; |
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 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
192 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
193 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
194 |
if (mk) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
195 |
mi = mi - mk + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
196 |
mj = mj - mk + 1; |
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 |
/* expand match to include neighboring popular lines */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
200 |
while (mi - mb > a1 && mj - mb > b1 && |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
201 |
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
|
202 |
mb++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
203 |
while (mi + mk < a2 && mj + mk < b2 && |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
204 |
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
|
205 |
mk++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
206 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
207 |
*omi = mi - mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
208 |
*omj = mj - mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
209 |
return mk + mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
210 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
211 |
|
474 | 212 |
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
|
213 |
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
|
214 |
{ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
215 |
int i, j, k; |
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 |
/* find the longest match in this chunk */ |
474 | 218 |
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
|
219 |
if (!k) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
220 |
return; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
221 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
222 |
/* and recurse on the remaining chunks on either side */ |
474 | 223 |
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
|
224 |
l->head->a1 = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
225 |
l->head->a2 = i + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
226 |
l->head->b1 = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
227 |
l->head->b2 = j + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
228 |
l->head++; |
474 | 229 |
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
|
230 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
231 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
232 |
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
|
233 |
{ |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
234 |
struct hunklist l; |
474 | 235 |
struct pos *pos; |
236 |
int t; |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
237 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
238 |
/* allocate and fill arrays */ |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
239 |
t = equatelines(a, an, b, bn); |
474 | 240 |
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
|
241 |
/* we can't have more matches than lines in the shorter file */ |
a61728b58dc0
Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents:
597
diff
changeset
|
242 |
l.head = l.base = malloc(sizeof(struct hunk) * ((an<bn ? an:bn) + 1)); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
243 |
|
474 | 244 |
if (pos && l.base && t) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
245 |
/* generate the matching block list */ |
474 | 246 |
recurse(a, b, pos, 0, an, 0, bn, &l); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
247 |
l.head->a1 = an; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
248 |
l.head->b1 = bn; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
249 |
l.head++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
250 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
251 |
|
474 | 252 |
free(pos); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
253 |
return l; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
254 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
255 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
256 |
static PyObject *blocks(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
257 |
{ |
435 | 258 |
PyObject *sa, *sb, *rl = NULL, *m; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
259 |
struct line *a, *b; |
970 | 260 |
struct hunklist l = {NULL, NULL}; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
261 |
struct hunk *h; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
262 |
int an, bn, pos = 0; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
263 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
264 |
if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
265 |
return NULL; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
266 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
267 |
an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
268 |
bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
269 |
if (!a || !b) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
270 |
goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
271 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
272 |
l = diff(a, an, b, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
273 |
rl = PyList_New(l.head - l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
274 |
if (!l.head || !rl) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
275 |
goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
276 |
|
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
277 |
for (h = l.base; h != l.head; h++) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
278 |
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
|
279 |
PyList_SetItem(rl, pos, m); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
280 |
pos++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
281 |
} |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
282 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
283 |
nomem: |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
284 |
free(a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
285 |
free(b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
286 |
free(l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
287 |
return rl ? rl : PyErr_NoMemory(); |
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 |
static PyObject *bdiff(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
291 |
{ |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
292 |
PyObject *sa, *sb, *result = NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
293 |
struct line *al, *bl; |
970 | 294 |
struct hunklist l = {NULL, NULL}; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
295 |
struct hunk *h; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
296 |
char encode[12], *rb; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
297 |
int an, bn, len = 0, la = 0, lb = 0; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
298 |
|
79c694462294
Add bdiff.blocks / minor performance tweaks
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411
diff
changeset
|
299 |
if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
300 |
return NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
301 |
|
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
302 |
an = splitlines(PyString_AsString(sa), PyString_Size(sa), &al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
303 |
bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
304 |
if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
305 |
goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
306 |
|
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
307 |
l = diff(al, an, bl, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
308 |
if (!l.head) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
309 |
goto nomem; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
310 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
311 |
/* calculate length of output */ |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
312 |
for (h = l.base; h != l.head; h++) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
313 |
if (h->a1 != la || h->b1 != lb) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
314 |
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
|
315 |
la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
316 |
lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
317 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
318 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
319 |
result = PyString_FromStringAndSize(NULL, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
320 |
if (!result) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
321 |
goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
322 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
323 |
/* build binary patch */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
324 |
rb = PyString_AsString(result); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
325 |
la = lb = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
326 |
|
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
327 |
for (h = l.base; h != l.head; h++) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
328 |
if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
329 |
len = bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
330 |
*(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
|
331 |
*(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
|
332 |
*(uint32_t *)(encode + 8) = htonl(len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
333 |
memcpy(rb, encode, 12); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
334 |
memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
335 |
rb += 12 + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
336 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
337 |
la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
338 |
lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
339 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
340 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
341 |
nomem: |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
342 |
free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
343 |
free(bl); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
344 |
free(l.base); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
345 |
return result ? result : PyErr_NoMemory(); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
346 |
} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
347 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
348 |
static char mdiff_doc[] = "Efficient binary diff."; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
349 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
350 |
static PyMethodDef methods[] = { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
351 |
{"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
352 |
{"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
353 |
{NULL, NULL} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
354 |
}; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
355 |
|
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
356 |
PyMODINIT_FUNC initbdiff(void) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
357 |
{ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
358 |
Py_InitModule3("bdiff", methods, mdiff_doc); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
359 |
} |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
360 |