1 /*
2  * Copyright (c) 2022, 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 /*
18  * pagebundler converts the given file into a valid C program that can
19  * be compiled.  The generated code provides a variable that holds the
20  * content of the original file and a _len variable with the size.
21  *
22  * Usage: pagebundler file > outfile
23  */
24 
25 #include <errno.h>
26 #include <limits.h>
27 #include <stdint.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <unistd.h>
32 
33 static void
34 setfname(const char *fname, char *buf, size_t siz)
35 {
36 	const char	*c, *d;
37 	size_t		 len;
38 
39 	if ((c = strrchr(fname, '/')) != NULL)
40 		c++;
41 	else
42 		c = fname;
43 
44 	if ((d = strrchr(fname, '.')) == NULL || c > d)
45 		d = strchr(fname, '\0');
46 
47 	len = d - c;
48 	if (len >= siz) {
49 		fprintf(stderr, "file name too long: %s\n", fname);
50 		exit(1);
51 	}
52 
53 	memcpy(buf, c, len);
54 	buf[len] = '\0';
55 }
56 
57 int
58 main(int argc, char **argv)
59 {
60 	size_t	 len, r, i;
61 	int	 did;
62 	FILE	*f;
63 	uint8_t	 buf[BUFSIZ];
64 	char	 varname[PATH_MAX];
65 
66 	if (argc != 2) {
67 		fprintf(stderr, "usage: %s file\n", *argv);
68 		return 1;
69 	}
70 
71 	setfname(argv[1], varname, sizeof(varname));
72 
73 	if ((f = fopen(argv[1], "r")) == NULL) {
74 		fprintf(stderr, "%s: can't open %s: %s",
75 		    argv[0], argv[1], strerror(errno));
76 		return 1;
77 	}
78 
79 	printf("const uint8_t %s[] = {\n", varname);
80 
81 	did = 0;
82 	len = 0;
83 	for (;;) {
84 		r = fread(buf, 1, sizeof(buf), f);
85 		len += r;
86 
87 		if (r != 0)
88 			did = 1;
89 
90 		printf("\t");
91 		for (i = 0; i < r; ++i) {
92 			printf("0x%x, ", buf[i]);
93 		}
94 		printf("\n");
95 
96 		if (r != sizeof(buf))
97 			break;
98 	}
99 
100 	if (!did) {
101 		/*
102 		 * if nothing was emitted, add a NUL byte.  This was
103 		 * still produce an exact copy of the file because
104 		 * `len' doesn't count this NUL byte.  It prevents the
105 		 * "use of GNU empty initializer extension" warning
106 		 * when bundling pages/about_empty.gmi
107 		 */
108 		printf("\t0x0\n");
109 	}
110 
111 	printf("}; /* %s */\n", varname);
112 
113 	printf("size_t %s_len = %zu;\n", varname, len);
114 
115 	fclose(f);
116 	return 0;
117 }