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f1035767 | 1 | /* Generate checksums of executables for PCH validation |
fbd26352 | 2 | Copyright (C) 2005-2019 Free Software Foundation, Inc. |
f1035767 | 3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8c4c00c1 | 8 | Software Foundation; either version 3, or (at your option) any later |
f1035767 | 9 | version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
f1035767 | 19 | |
20 | #include "bconfig.h" | |
21 | #include "system.h" | |
22 | #include "md5.h" | |
23 | ||
24 | static void | |
25 | usage (void) | |
26 | { | |
18cfeada | 27 | fputs ("Usage: genchecksums <filename> ...\n", stderr); |
f1035767 | 28 | } |
29 | ||
18cfeada | 30 | /* Important: BLOCKSIZE must be a multiple of 64. */ |
31 | #define BLOCKSIZE 4096 | |
32 | ||
f1035767 | 33 | static void |
18cfeada | 34 | dosum (struct md5_ctx *ctx, const char *file) |
f1035767 | 35 | { |
36 | FILE *f; | |
18cfeada | 37 | char buffer[BLOCKSIZE + 72]; |
38 | size_t sum; | |
48e1416a | 39 | |
f1035767 | 40 | f = fopen (file, "rb"); |
41 | if (!f) | |
42 | { | |
43 | fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno)); | |
44 | exit (1); | |
45 | } | |
48e1416a | 46 | |
f1035767 | 47 | /* Some executable formats have timestamps in the first 16 bytes, yuck. */ |
48 | if (fseek (f, 16, SEEK_SET) != 0) | |
49 | { | |
50 | fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno)); | |
51 | exit (1); | |
52 | } | |
48e1416a | 53 | |
18cfeada | 54 | /* Iterate over full file contents. */ |
55 | while (1) | |
56 | { | |
57 | /* We read the file in blocks of BLOCKSIZE bytes. One call of the | |
58 | computation function processes the whole buffer so that with the | |
59 | next round of the loop another block can be read. */ | |
60 | size_t n; | |
61 | sum = 0; | |
62 | ||
63 | /* Read block. Take care for partial reads. */ | |
64 | do | |
65 | { | |
66 | n = fread (buffer + sum, 1, BLOCKSIZE - sum, f); | |
67 | ||
68 | sum += n; | |
69 | } | |
70 | while (sum < BLOCKSIZE && n != 0); | |
71 | if (n == 0 && ferror (f)) | |
72 | exit (1); | |
73 | ||
74 | /* If end of file is reached, end the loop. */ | |
75 | if (n == 0) | |
76 | break; | |
77 | ||
78 | /* Process buffer with BLOCKSIZE bytes. Note that | |
79 | BLOCKSIZE % 64 == 0 | |
80 | */ | |
81 | md5_process_block (buffer, BLOCKSIZE, ctx); | |
82 | } | |
83 | ||
84 | /* Add the last bytes if necessary. */ | |
85 | if (sum > 0) | |
86 | md5_process_bytes (buffer, sum, ctx); | |
87 | ||
88 | if (fclose (f) != 0) | |
f1035767 | 89 | { |
90 | fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno)); | |
91 | exit (1); | |
92 | } | |
f1035767 | 93 | } |
94 | ||
95 | int | |
96 | main (int argc, char ** argv) | |
97 | { | |
18cfeada | 98 | struct md5_ctx ctx; |
99 | unsigned char result[16]; | |
100 | int i; | |
101 | ||
102 | if (argc < 2) | |
f1035767 | 103 | { |
104 | usage (); | |
105 | return 1; | |
106 | } | |
107 | ||
18cfeada | 108 | md5_init_ctx (&ctx); |
109 | for (i = 1; i < argc; i++) | |
110 | dosum (&ctx, argv[i]); | |
111 | md5_finish_ctx (&ctx, result); | |
112 | ||
113 | puts ("#include \"config.h\""); | |
114 | puts ("#include \"system.h\""); | |
115 | fputs ("EXPORTED_CONST unsigned char executable_checksum[16] = { ", stdout); | |
116 | for (i = 0; i < 16; i++) | |
117 | printf ("0x%02x%s", result[i], i == 15 ? " };\n" : ", "); | |
f1035767 | 118 | |
119 | return 0; | |
120 | } |