2 * (C) Copyright 2011 Free Electrons
3 * David Wagner <david.wagner@free-electrons.com>
5 * Inspired from envcrc.c:
7 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 #include <sys/types.h>
38 #include <u-boot/crc.h>
41 #define CRC_SIZE sizeof(uint32_t)
43 static void usage(const char *exec_name)
45 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] "
46 "-s <environment partition size> -o <output> <input file>\n"
48 "This tool takes a key=value input file (same as would a "
49 "`printenv' show) and generates the corresponding environment "
50 "image, ready to be flashed.\n"
52 "\tThe input file is in format:\n"
56 "\t-r : the environment has multiple copies in flash\n"
57 "\t-b : the target is big endian (default is little endian)\n"
58 "\t-p <byte> : fill the image with <byte> bytes instead of "
60 "\t-V : print version information and exit\n"
62 "If the input file is \"-\", data is read from standard input\n",
66 int main(int argc, char **argv)
68 uint32_t crc, targetendian_crc;
69 const char *txt_filename = NULL, *bin_filename = NULL;
71 unsigned char *dataptr, *envptr;
72 unsigned char *filebuf = NULL;
73 unsigned int filesize = 0, envsize = 0, datasize = 0;
76 unsigned char padbyte = 0xff;
79 int ret = EXIT_SUCCESS;
81 struct stat txt_file_stat;
85 /* Turn off getopt()'s internal error message */
88 /* Parse the cmdline */
89 while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
92 datasize = strtol(optarg, NULL, 0);
95 bin_filename = strdup(optarg);
97 fprintf(stderr, "Can't strdup() the output "
109 padbyte = strtol(optarg, NULL, 0);
115 printf("%s version %s\n", prg, PLAIN_VERSION);
118 fprintf(stderr, "Missing argument for option -%c\n",
123 fprintf(stderr, "Wrong option -%c\n", optopt);
129 /* Check datasize and allocate the data */
132 "Please specify the size of the environment "
138 dataptr = malloc(datasize * sizeof(*dataptr));
140 fprintf(stderr, "Can't alloc dataptr.\n");
145 * envptr points to the beginning of the actual environment (after the
146 * crc and possible `redundant' bit
148 envsize = datasize - (CRC_SIZE + redundant);
149 envptr = dataptr + CRC_SIZE + redundant;
151 /* Pad the environment with the padding byte */
152 memset(envptr, padbyte, envsize);
154 /* Open the input file ... */
155 if (optind >= argc) {
156 fprintf(stderr, "Please specify an input filename\n");
160 txt_filename = argv[optind];
161 if (strcmp(txt_filename, "-") == 0) {
163 int readlen = sizeof(*envptr) * 2048;
164 txt_fd = STDIN_FILENO;
167 filebuf = realloc(filebuf, readlen);
168 readbytes = read(txt_fd, filebuf + filesize, readlen);
169 filesize += readbytes;
170 } while (readbytes == readlen);
173 txt_fd = open(txt_filename, O_RDONLY);
175 fprintf(stderr, "Can't open \"%s\": %s\n",
176 txt_filename, strerror(errno));
179 /* ... and check it */
180 ret = fstat(txt_fd, &txt_file_stat);
182 fprintf(stderr, "Can't stat() on \"%s\": "
183 "%s\n", txt_filename, strerror(errno));
187 filesize = txt_file_stat.st_size;
188 /* Read the raw input file and transform it */
189 filebuf = malloc(sizeof(*envptr) * filesize);
190 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
191 if (ret != sizeof(*envptr) * filesize) {
192 fprintf(stderr, "Can't read the whole input file\n");
198 * The right test to do is "=>" (not ">") because of the additional
199 * ending \0. See below.
201 if (filesize >= envsize) {
202 fprintf(stderr, "The input file is larger than the "
203 "environment partition size\n");
207 /* Replace newlines separating variables with \0 */
208 for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
209 if (filebuf[fp] == '\n') {
212 * Newline at the beginning of the file ?
216 } else if (filebuf[fp-1] == '\\') {
218 * Embedded newline in a variable.
220 * The backslash was added to the envptr ;
221 * rewind and replace it with a newline
226 /* End of a variable */
229 } else if (filebuf[fp] == '#') {
230 if (fp != 0 && filebuf[fp-1] == '\n') {
231 /* This line is a comment, let's skip it */
232 while (fp < txt_file_stat.st_size && fp++ &&
233 filebuf[fp] != '\n');
235 envptr[ep++] = filebuf[fp];
238 envptr[ep++] = filebuf[fp];
242 * Make sure there is a final '\0'
243 * And do it again on the next byte to mark the end of the environment.
245 if (envptr[ep-1] != '\0') {
248 * The text file doesn't have an ending newline. We need to
249 * check the env size again to make sure we have room for two \0
252 fprintf(stderr, "The environment file is too large for "
253 "the target environment storage\n");
261 /* Computes the CRC and put it at the beginning of the data */
262 crc = crc32(0, envptr, envsize);
263 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
265 memcpy(dataptr, &targetendian_crc, sizeof(uint32_t));
267 bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
269 fprintf(stderr, "Can't open output file \"%s\": %s\n",
270 bin_filename, strerror(errno));
274 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
275 sizeof(*dataptr) * datasize) {
276 fprintf(stderr, "write() failed: %s\n", strerror(errno));