1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/* Hash inputs and generate C file with the digest.
Copyright (C) 1985-1986, 1992-1994, 1997, 1999-2016, 2018-2019
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
/* The arguments given to this program are all the object files that
go into building GNU Emacs. There is no special search logic to find
the files. */
#include <config.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sysstdio.h>
#include <fingerprint.h>
#include <getopt.h>
#include <intprops.h>
#include <min-max.h>
#include <sha256.h>
#ifndef SSIZE_MAX
# define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
#endif
#ifdef WINDOWSNT
/* Defined to be sys_fopen in ms-w32.h, but only #ifdef emacs, so this
is really just insurance. */
#undef fopen
#include <direct.h>
#ifndef MINGW_W64
# undef fseeko
# define fseeko fseeko64
#endif
#endif /* WINDOWSNT */
/* Static (instead of being local to 'main') to pacify LeakSanitizer. */
static char *buf;
int
main (int argc, char **argv)
{
int c;
bool raw = false;
while (0 <= (c = getopt (argc, argv, "rh")))
{
switch (c)
{
case 'r':
raw = true;
break;
case 'h':
printf ("make-fingerprint [-r] FILE: replace or compute a hash\n");
return EXIT_SUCCESS;
default:
return EXIT_FAILURE;
}
}
struct sha256_ctx ctx;
sha256_init_ctx (&ctx);
char *prog = argv[0];
char *file = argv[optind];
if (argc - optind != 1)
{
fprintf (stderr, "%s: missing or extra file operand\n", prog);
return EXIT_FAILURE;
}
FILE *f = fopen (file, raw ? "r" FOPEN_BINARY : "r+" FOPEN_BINARY);
struct stat st;
if (!f || fstat (fileno (f), &st) != 0)
{
perror (file);
return EXIT_FAILURE;
}
if (!S_ISREG (st.st_mode))
{
fprintf (stderr, "%s: Error: %s is not a regular file\n",
prog, file);
return EXIT_FAILURE;
}
ptrdiff_t maxlen = min (min (TYPE_MAXIMUM (off_t), PTRDIFF_MAX),
min (SIZE_MAX, SSIZE_MAX));
if (maxlen <= st.st_size)
{
fprintf (stderr, "%s: %s: file too big\n", prog, file);
return EXIT_FAILURE;
}
buf = malloc (st.st_size + 1);
if (!buf)
{
perror ("malloc");
return EXIT_FAILURE;
}
size_t chunksz = fread (buf, 1, st.st_size + 1, f);
if (ferror (f) || chunksz != st.st_size)
{
fprintf (stderr, "%s: Error: could not read %s\n", prog, file);
return EXIT_FAILURE;
}
sha256_process_bytes (buf, chunksz, &ctx);
unsigned char digest[32];
sha256_finish_ctx (&ctx, digest);
if (raw)
{
for (int i = 0; i < 32; ++i)
printf ("%02X", digest[i]);
}
else
{
bool fingered = false;
for (char *finger = buf;
(finger = memmem (finger, buf + chunksz - finger,
fingerprint, sizeof fingerprint));
finger++)
{
if (! (fseeko (f, finger - buf, SEEK_SET) == 0
&& fwrite (digest, 1, sizeof digest, f) == sizeof digest))
{
perror (file);
return EXIT_FAILURE;
}
fingered = true;
}
if (!fingered)
{
fprintf (stderr, "%s: %s: missing fingerprint\n", prog, file);
return EXIT_FAILURE;
}
}
if (fclose (f) != 0)
{
perror (file);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
/* make-fingerprint.c ends here */
|
