1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Convert a file image to a C define
4 *
5 * Copyright (c) 2017 Heinrich Schuchardt <xypron.glpk@gmx.de>
6 *
7 * For testing EFI disk management we need an in memory image of
8 * a disk.
9 *
10 * The tool file2include converts a file to a C include. The file
11 * is separated into strings of 8 bytes. Only the non-zero strings
12 * are written to the include. The output format has been designed
13 * to maintain readability.
14 *
15 * As the disk image needed for testing contains mostly zeroes a high
16 * compression ratio can be attained.
17 */
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <stdint.h>
21
22 /* Size of the blocks written to the compressed file */
23 #define BLOCK_SIZE 8
24
main(int argc,char * argv[])25 int main(int argc, char *argv[])
26 {
27 FILE *file;
28 int ret;
29 unsigned char *buf;
30 size_t count, i, j;
31
32 /* Provide usage help */
33 if (argc != 2) {
34 printf("Usage:\n%s FILENAME\n", argv[0]);
35 return EXIT_FAILURE;
36 }
37 /* Open file */
38 file = fopen(argv[1], "r");
39 if (!file) {
40 perror("fopen");
41 return EXIT_FAILURE;
42 }
43 /* Get file length */
44 ret = fseek(file, 0, SEEK_END);
45 if (ret < 0) {
46 perror("fseek");
47 return EXIT_FAILURE;
48 }
49 count = ftell(file);
50 if (!count) {
51 fprintf(stderr, "File %s has length 0\n", argv[1]);
52 return EXIT_FAILURE;
53 }
54 rewind(file);
55 /* Read file */
56 buf = malloc(count);
57 if (!buf) {
58 perror("calloc");
59 return EXIT_FAILURE;
60 }
61 count = fread(buf, 1, count, file);
62
63 /* Generate output */
64 printf("/* SPDX-License-Identifier: GPL-2.0+ */\n");
65 printf("/*\n");
66 printf(" * Non-zero %u byte strings of a disk image\n", BLOCK_SIZE);
67 printf(" *\n");
68 printf(" * Generated with tools/file2include\n");
69 printf(" */\n\n");
70 printf("#define EFI_ST_DISK_IMG { 0x%08zx, { \\\n", count);
71
72 for (i = 0; i < count; i += BLOCK_SIZE) {
73 int c = 0;
74
75 for (j = i; j < i + BLOCK_SIZE && j < count; ++j) {
76 if (buf[j])
77 c = 1;
78 }
79 if (!c)
80 continue;
81 printf("\t{0x%08zx, \"", i);
82 for (j = i; j < i + BLOCK_SIZE && j < count; ++j)
83 printf("\\x%02x", buf[j]);
84 printf("\"}, /* ");
85 for (j = i; j < i + BLOCK_SIZE && j < count; ++j) {
86 if (buf[j] != '*' && buf[j] >= 0x20 && buf[j] <= 0x7e)
87 printf("%c", buf[j]);
88 else
89 printf(".");
90 }
91 printf(" */ \\\n");
92 }
93 printf("\t{0, NULL} } }\n");
94
95 /* Release resources */
96 free(buf);
97 ret = fclose(file);
98 if (ret) {
99 perror("fclose");
100 return EXIT_FAILURE;
101 }
102 return EXIT_SUCCESS;
103 }
104