Mercurial > hg
annotate mercurial/bdiff.c @ 7412:ebbfacb2eea5
coal/paper: link to shortlog instead of log from error pages
author | Dirkjan Ochtman <dirkjan@ochtman.nl> |
---|---|
date | Tue, 25 Nov 2008 22:52:25 +0100 |
parents | 8bbbba2a1a9c |
children | 930a2be7e875 |
rev | line source |
---|---|
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
1 /* |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
2 bdiff.c - efficient binary diff extension for Mercurial |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
3 |
2859 | 4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
5 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
6 This software may be used and distributed according to the terms of |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
7 the GNU General Public License, incorporated herein by reference. |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
8 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
9 Based roughly on Python difflib |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
10 */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
11 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
12 #include <Python.h> |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
13 #include <stdlib.h> |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
14 #include <string.h> |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
15 #include <limits.h> |
867
0cd2ee61b10a
Allow Mercurial to build on HP-UX 11
tksoh@users.sourceforge.net
parents:
839
diff
changeset
|
16 |
3561
8c617d48564a
add AIX to the list of compilers that don't have inline keyword
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
3369
diff
changeset
|
17 #if defined __hpux || defined __SUNPRO_C || defined _AIX |
1759
5afd459db177
Sunpro compiler patch
Fabian Otto <sigsegv@alchiba.ni.cs.tu-berlin.de>
parents:
1542
diff
changeset
|
18 # define inline |
2600
c4325f0a9b91
clean up trailing white space.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
2577
diff
changeset
|
19 #endif |
1759
5afd459db177
Sunpro compiler patch
Fabian Otto <sigsegv@alchiba.ni.cs.tu-berlin.de>
parents:
1542
diff
changeset
|
20 |
411
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
21 #ifdef _WIN32 |
551 | 22 #ifdef _MSC_VER |
23 #define inline __inline | |
24 typedef unsigned long uint32_t; | |
25 #else | |
510
7f3fc8fd427e
More fiddling with uint32_t includes for extensions
mpm@selenic.com
parents:
495
diff
changeset
|
26 #include <stdint.h> |
551 | 27 #endif |
411
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
28 static uint32_t htonl(uint32_t x) |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
29 { |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
30 return ((x & 0x000000ffUL) << 24) | |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
31 ((x & 0x0000ff00UL) << 8) | |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
32 ((x & 0x00ff0000UL) >> 8) | |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
33 ((x & 0xff000000UL) >> 24); |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
34 } |
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
35 #else |
510
7f3fc8fd427e
More fiddling with uint32_t includes for extensions
mpm@selenic.com
parents:
495
diff
changeset
|
36 #include <sys/types.h> |
7036
bfad9865b1dc
allow Mercurial to compile on Haiku
Scott McCreary <scottmc2@gmail.com>
parents:
5620
diff
changeset
|
37 #if defined __BEOS__ && !defined __HAIKU__ |
4073
95ffa36d1d2a
BeOS compatibility support
Andrew Bachmann <andrewbachmann@gmail.com>
parents:
3561
diff
changeset
|
38 #include <ByteOrder.h> |
95ffa36d1d2a
BeOS compatibility support
Andrew Bachmann <andrewbachmann@gmail.com>
parents:
3561
diff
changeset
|
39 #else |
597
e530637ea060
[PATCH] use <arpa/inet.h> instead of <netinet/in.h> for ntohl/htonl
mpm@selenic.com
parents:
553
diff
changeset
|
40 #include <arpa/inet.h> |
4073
95ffa36d1d2a
BeOS compatibility support
Andrew Bachmann <andrewbachmann@gmail.com>
parents:
3561
diff
changeset
|
41 #endif |
2543
860e9c83fc59
Include inttypes.h instead of stdint.h (fixes issue299)
Thomas Arendsen Hein <thomas@intevation.de>
parents:
2483
diff
changeset
|
42 #include <inttypes.h> |
411
9e9f7ab43ce2
Add 'other OS' bits to bdiff.c / style cleanups
mpm@selenic.com
parents:
400
diff
changeset
|
43 #endif |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
44 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
45 struct line { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
46 int h, len, n, e; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
47 const char *l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
48 }; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
49 |
474 | 50 struct pos { |
51 int pos, len; | |
52 }; | |
53 | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
54 struct hunk { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
55 int a1, a2, b1, b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
56 }; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
57 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
58 struct hunklist { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
59 struct hunk *base, *head; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
60 }; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
61 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
62 int splitlines(const char *a, int len, struct line **lr) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
63 { |
5342 | 64 int h, i; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
65 const char *p, *b = a; |
5340
5737845fd974
bdiff: simple splitlines optimization
Christoph Spiel <cspiel@freenet.de>
parents:
5339
diff
changeset
|
66 const char * const plast = a + len - 1; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
67 struct line *l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
68 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
69 /* count the lines */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
70 i = 1; /* extra line for sentinel */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
71 for (p = a; p < a + len; p++) |
5340
5737845fd974
bdiff: simple splitlines optimization
Christoph Spiel <cspiel@freenet.de>
parents:
5339
diff
changeset
|
72 if (*p == '\n' || p == plast) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
73 i++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
74 |
1978
10606ee61107
do proper typecasting on malloc() and calloc() calls
TK Soh <teekaysoh@yahoo.com>
parents:
1759
diff
changeset
|
75 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
76 if (!l) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
77 return -1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
78 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
79 /* build the line array and calculate hashes */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
80 h = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
81 for (p = a; p < a + len; p++) { |
5342 | 82 /* Leonid Yuriev's hash */ |
7187
a79d3f535809
spaces->tabs in one line of a C extension for consistency
Thomas Arendsen Hein <thomas@intevation.de>
parents:
7036
diff
changeset
|
83 h = (h * 1664525) + *p + 1013904223; |
5342 | 84 |
5340
5737845fd974
bdiff: simple splitlines optimization
Christoph Spiel <cspiel@freenet.de>
parents:
5339
diff
changeset
|
85 if (*p == '\n' || p == plast) { |
5342 | 86 l->h = h; |
87 h = 0; | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
88 l->len = p - b + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
89 l->l = b; |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
90 l->n = INT_MAX; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
91 l++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
92 b = p + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
93 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
94 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
95 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
96 /* set up a sentinel */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
97 l->h = l->len = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
98 l->l = a + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
99 return i - 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
100 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
101 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
102 int inline cmp(struct line *a, struct line *b) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
103 { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
104 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
105 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
106 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
107 static int equatelines(struct line *a, int an, struct line *b, int bn) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
108 { |
5452
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
109 int i, j, buckets = 1, t, scale; |
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
110 struct pos *h = NULL; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
111 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
112 /* build a hash table of the next highest power of 2 */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
113 while (buckets < bn + 1) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
114 buckets *= 2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
115 |
5339
058e93c3d07d
I have spotted the biggest bottleneck in "bdiff.c". Actually it was
Christoph Spiel <cspiel@freenet.de>
parents:
4134
diff
changeset
|
116 /* try to allocate a large hash table to avoid collisions */ |
5452
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
117 for (scale = 4; scale; scale /= 2) { |
5339
058e93c3d07d
I have spotted the biggest bottleneck in "bdiff.c". Actually it was
Christoph Spiel <cspiel@freenet.de>
parents:
4134
diff
changeset
|
118 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos)); |
5452
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
119 if (h) |
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
120 break; |
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
121 } |
5339
058e93c3d07d
I have spotted the biggest bottleneck in "bdiff.c". Actually it was
Christoph Spiel <cspiel@freenet.de>
parents:
4134
diff
changeset
|
122 |
474 | 123 if (!h) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
124 return 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
125 |
5339
058e93c3d07d
I have spotted the biggest bottleneck in "bdiff.c". Actually it was
Christoph Spiel <cspiel@freenet.de>
parents:
4134
diff
changeset
|
126 buckets = buckets * scale - 1; |
058e93c3d07d
I have spotted the biggest bottleneck in "bdiff.c". Actually it was
Christoph Spiel <cspiel@freenet.de>
parents:
4134
diff
changeset
|
127 |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
128 /* clear the hash table */ |
474 | 129 for (i = 0; i <= buckets; i++) { |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
130 h[i].pos = INT_MAX; |
474 | 131 h[i].len = 0; |
132 } | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
133 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
134 /* add lines to the hash table chains */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
135 for (i = bn - 1; i >= 0; i--) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
136 /* find the equivalence class */ |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
137 for (j = b[i].h & buckets; h[j].pos != INT_MAX; |
474 | 138 j = (j + 1) & buckets) |
139 if (!cmp(b + i, b + h[j].pos)) | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
140 break; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
141 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
142 /* add to the head of the equivalence class */ |
474 | 143 b[i].n = h[j].pos; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
144 b[i].e = j; |
474 | 145 h[j].pos = i; |
146 h[j].len++; /* keep track of popularity */ | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
147 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
148 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
149 /* compute popularity threshold */ |
5452
82b4ff3abbcd
bdiff: tweaks for large files
Matt Mackall <mpm@selenic.com>
parents:
5342
diff
changeset
|
150 t = (bn >= 4000) ? bn / 1000 : bn + 1; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
151 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
152 /* match items in a to their equivalence class in b */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
153 for (i = 0; i < an; i++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
154 /* find the equivalence class */ |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
155 for (j = a[i].h & buckets; h[j].pos != INT_MAX; |
474 | 156 j = (j + 1) & buckets) |
157 if (!cmp(a + i, b + h[j].pos)) | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
158 break; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
159 |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
160 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
|
161 if (h[j].len <= t) |
474 | 162 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
|
163 else |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
164 a[i].n = INT_MAX; /* too popular */ |
400
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 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
167 /* discard hash tables */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
168 free(h); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
169 return 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
170 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
171 |
474 | 172 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
|
173 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
|
174 { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
175 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
|
176 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
177 for (i = a1; i < a2; i++) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
178 /* skip things before the current block */ |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
179 for (j = a[i].n; j < b1; j = b[j].n) |
400
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 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
182 /* loop through all lines match a[i] in b */ |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
183 for (; j < b2; j = b[j].n) { |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
184 /* does this extend an earlier match? */ |
474 | 185 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
186 k = pos[j - 1].len + 1; | |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
187 else |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
188 k = 1; |
474 | 189 pos[j].pos = i; |
190 pos[j].len = k; | |
400
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 /* best match so far? */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
193 if (k > mk) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
194 mi = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
195 mj = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
196 mk = k; |
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 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
201 if (mk) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
202 mi = mi - mk + 1; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
203 mj = mj - mk + 1; |
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 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
206 /* expand match to include neighboring popular lines */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
207 while (mi - mb > a1 && mj - mb > b1 && |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
208 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
|
209 mb++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
210 while (mi + mk < a2 && mj + mk < b2 && |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
211 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
|
212 mk++; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
213 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
214 *omi = mi - mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
215 *omj = mj - mb; |
5341
458acf92b49e
bdiff: use INT_MAX to avoid some inner loop comparisons
Matt Mackall <mpm@selenic.com>
parents:
5340
diff
changeset
|
216 |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
217 return mk + mb; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
218 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
219 |
474 | 220 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
|
221 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
|
222 { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
223 int i, j, k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
224 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
225 /* find the longest match in this chunk */ |
474 | 226 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
|
227 if (!k) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
228 return; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
229 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
230 /* and recurse on the remaining chunks on either side */ |
474 | 231 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
|
232 l->head->a1 = i; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
233 l->head->a2 = i + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
234 l->head->b1 = j; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
235 l->head->b2 = j + k; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
236 l->head++; |
474 | 237 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
|
238 } |
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 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
|
241 { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
242 struct hunklist l; |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
243 struct hunk *curr; |
474 | 244 struct pos *pos; |
245 int t; | |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
246 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
247 /* allocate and fill arrays */ |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
248 t = equatelines(a, an, b, bn); |
5571 | 249 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos)); |
827
a61728b58dc0
Fix array overflow bug in bdiff
"Wallace, Eric S" <eric.s.wallace@intel.com>
parents:
597
diff
changeset
|
250 /* 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
|
251 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
|
252 ((an<bn ? an:bn) + 1)); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
253 |
474 | 254 if (pos && l.base && t) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
255 /* generate the matching block list */ |
474 | 256 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:
3561
diff
changeset
|
257 l.head->a1 = l.head->a2 = an; |
1ca664c964e0
don't return uninitialized memory from bdiff.blocks()
Erling Ellingsen <erlingalf@gmail.com>
parents:
3561
diff
changeset
|
258 l.head->b1 = l.head->b2 = bn; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
259 l.head++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
260 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
261 |
474 | 262 free(pos); |
7104
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
263 |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
264 for (curr = l.base; curr != l.head; curr++) { |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
265 struct hunk *next = curr+1; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
266 int shift = 0; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
267 |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
268 if (next == l.head) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
269 break; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
270 |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
271 if (curr->a2 == next->a1) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
272 while (curr->a2+shift < an && curr->b2+shift < bn |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
273 && !cmp(a+curr->a2+shift, b+curr->b2+shift)) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
274 shift++; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
275 else if (curr->b2 == next->b1) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
276 while (curr->b2+shift < bn && curr->a2+shift < an |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
277 && !cmp(b+curr->b2+shift, a+curr->a2+shift)) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
278 shift++; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
279 if (!shift) |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
280 continue; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
281 curr->b2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
282 next->b1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
283 curr->a2 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
284 next->a1 += shift; |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
285 } |
9514cbb6e4f6
bdiff: normalize the diff (issue1295)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
7036
diff
changeset
|
286 |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
287 return l; |
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 *blocks(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
291 { |
435 | 292 PyObject *sa, *sb, *rl = NULL, *m; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
293 struct line *a, *b; |
970 | 294 struct hunklist l = {NULL, NULL}; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
295 struct hunk *h; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
296 int an, bn, pos = 0; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
297 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
298 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
299 return NULL; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
300 |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
301 an = splitlines(PyString_AsString(sa), PyString_Size(sa), &a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
302 bn = splitlines(PyString_AsString(sb), PyString_Size(sb), &b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
303 if (!a || !b) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
304 goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
305 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
306 l = diff(a, an, b, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
307 rl = PyList_New(l.head - l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
308 if (!l.head || !rl) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
309 goto nomem; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
310 |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
311 for (h = l.base; h != l.head; h++) { |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
312 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
|
313 PyList_SetItem(rl, pos, m); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
314 pos++; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
315 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
316 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
317 nomem: |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
318 free(a); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
319 free(b); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
320 free(l.base); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
321 return rl ? rl : PyErr_NoMemory(); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
322 } |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
323 |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
324 static PyObject *bdiff(PyObject *self, PyObject *args) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
325 { |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
326 char *sa, *sb; |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
327 PyObject *result = NULL; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
328 struct line *al, *bl; |
970 | 329 struct hunklist l = {NULL, NULL}; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
330 struct hunk *h; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
331 char encode[12], *rb; |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
332 int an, bn, len = 0, la, lb; |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
333 |
3369
4bad632913d8
python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
parents:
3335
diff
changeset
|
334 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
|
335 return NULL; |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
336 |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
337 an = splitlines(sa, la, &al); |
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
338 bn = splitlines(sb, lb, &bl); |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
339 if (!al || !bl) |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
340 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
341 |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
342 l = diff(al, an, bl, bn); |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
343 if (!l.head) |
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
344 goto nomem; |
400
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
345 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
346 /* calculate length of output */ |
3335
9061613c1593
Teach bdiff to support buffer objects
Brendan Cully <brendan@kublai.com>
parents:
2859
diff
changeset
|
347 la = lb = 0; |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
348 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
|
349 if (h->a1 != la || h->b1 != lb) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
350 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
|
351 la = h->a2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
352 lb = h->b2; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
353 } |
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 result = PyString_FromStringAndSize(NULL, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
356 if (!result) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
357 goto nomem; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
358 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
359 /* build binary patch */ |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
360 rb = PyString_AsString(result); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
361 la = lb = 0; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
362 |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
363 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
|
364 if (h->a1 != la || h->b1 != lb) { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
365 len = bl[h->b1].l - bl[lb].l; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
366 *(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
|
367 *(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
|
368 *(uint32_t *)(encode + 8) = htonl(len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
369 memcpy(rb, encode, 12); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
370 memcpy(rb + 12, bl[lb].l, len); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
371 rb += 12 + len; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
372 } |
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 } |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
376 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
377 nomem: |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
378 free(al); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
379 free(bl); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
380 free(l.base); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
381 return result ? result : PyErr_NoMemory(); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
382 } |
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 static char mdiff_doc[] = "Efficient binary diff."; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
385 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
386 static PyMethodDef methods[] = { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
387 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
79c694462294
Add bdiff.blocks / minor performance tweaks
mpm@selenic.com
parents:
411
diff
changeset
|
388 {"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
|
389 {NULL, NULL} |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
390 }; |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
391 |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
392 PyMODINIT_FUNC initbdiff(void) |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
393 { |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
394 Py_InitModule3("bdiff", methods, mdiff_doc); |
8b067bde6679
Add a fast binary diff extension (not yet used)
mpm@selenic.com
parents:
diff
changeset
|
395 } |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
|
396 |