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,
28 /* We want the GNU version of basename() */
38 #include <sys/types.h>
42 #include <u-boot/crc.h>
45 #define CRC_SIZE sizeof(uint32_t)
47 static void usage(const char *exec_name)
49 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
51 "This tool takes a key=value input file (same as would a `printenv' show) and generates the corresponding environment image, ready to be flashed.\n"
53 "\tThe input file is in format:\n"
57 "\t-r : the environment has multiple copies in flash\n"
58 "\t-b : the target is big endian (default is little endian)\n"
59 "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
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;
86 prg = basename(argv[0]);
88 /* Turn off getopt()'s internal error message */
91 /* Parse the cmdline */
92 while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
95 datasize = strtol(optarg, NULL, 0);
98 bin_filename = strdup(optarg);
100 fprintf(stderr, "Can't strdup() the output filename\n");
111 padbyte = strtol(optarg, NULL, 0);
117 printf("%s version %s\n", prg, PLAIN_VERSION);
120 fprintf(stderr, "Missing argument for option -%c\n",
125 fprintf(stderr, "Wrong option -%c\n", optopt);
131 /* Check datasize and allocate the data */
133 fprintf(stderr, "Please specify the size of the environment partition.\n");
138 dataptr = malloc(datasize * sizeof(*dataptr));
140 fprintf(stderr, "Can't alloc %d bytes for dataptr.\n",
146 * envptr points to the beginning of the actual environment (after the
147 * crc and possible `redundant' byte
149 envsize = datasize - (CRC_SIZE + redundant);
150 envptr = dataptr + CRC_SIZE + redundant;
152 /* Pad the environment with the padding byte */
153 memset(envptr, padbyte, envsize);
155 /* Open the input file ... */
156 if (optind >= argc) {
157 fprintf(stderr, "Please specify an input filename\n");
161 txt_filename = argv[optind];
162 if (strcmp(txt_filename, "-") == 0) {
164 int readlen = sizeof(*envptr) * 2048;
165 txt_fd = STDIN_FILENO;
168 filebuf = realloc(filebuf, readlen);
169 readbytes = read(txt_fd, filebuf + filesize, readlen);
170 filesize += readbytes;
171 } while (readbytes == readlen);
174 txt_fd = open(txt_filename, O_RDONLY);
176 fprintf(stderr, "Can't open \"%s\": %s\n",
177 txt_filename, strerror(errno));
180 /* ... and check it */
181 ret = fstat(txt_fd, &txt_file_stat);
183 fprintf(stderr, "Can't stat() on \"%s\": %s\n",
184 txt_filename, strerror(errno));
188 filesize = txt_file_stat.st_size;
189 /* Read the raw input file and transform it */
190 filebuf = malloc(sizeof(*envptr) * filesize);
191 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
192 if (ret != sizeof(*envptr) * filesize) {
193 fprintf(stderr, "Can't read the whole input file\n");
198 /* The +1 is for the additionnal ending \0. See below. */
199 if (filesize + 1 > envsize) {
200 fprintf(stderr, "The input file is larger than the environment partition size\n");
204 /* Replace newlines separating variables with \0 */
205 for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
206 if (filebuf[fp] == '\n') {
209 * Newlines at the beginning of the file ?
213 } else if (filebuf[fp-1] == '\\') {
215 * Embedded newline in a variable.
217 * The backslash was added to the envptr; rewind
218 * and replace it with a newline
223 /* End of a variable */
226 } else if (filebuf[fp] == '#') {
227 if (fp != 0 && filebuf[fp-1] == '\n') {
228 /* This line is a comment, let's skip it */
229 while (fp < txt_file_stat.st_size && fp++ &&
230 filebuf[fp] != '\n');
232 envptr[ep++] = filebuf[fp];
235 envptr[ep++] = filebuf[fp];
239 * Make sure there is a final '\0'
240 * And do it again on the next byte to mark the end of the environment.
242 if (envptr[ep-1] != '\0') {
245 * The text file doesn't have an ending newline. We need to
246 * check the env size again to make sure we have room for two \0
249 fprintf(stderr, "The environment file is too large for the target environment storage\n");
257 /* Computes the CRC and put it at the beginning of the data */
258 crc = crc32(0, envptr, envsize);
259 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
261 memcpy(dataptr, &targetendian_crc, sizeof(uint32_t));
263 bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
265 fprintf(stderr, "Can't open output file \"%s\": %s\n",
266 bin_filename, strerror(errno));
270 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
271 sizeof(*dataptr) * datasize) {
272 fprintf(stderr, "write() failed: %s\n", strerror(errno));