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>
40 #define CRC_SIZE sizeof(uint32_t)
42 static void usage(const char *exec_name)
44 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] "
45 "-s <environment partition size> -o <output> <input file>\n"
47 "This tool takes a key=value input file (same as would a "
48 "`printenv' show) and generates the corresponding environment "
49 "image, ready to be flashed.\n"
51 "\tThe input file is in format:\n"
55 "\t-r : the environment has multiple copies in flash\n"
56 "\t-b : the target is big endian (default is little endian)\n"
57 "\t-p <byte> : fill the image with <byte> bytes instead of "
60 "If the input file is \"-\", data is read from standard input\n",
64 int main(int argc, char **argv)
66 uint32_t crc, targetendian_crc;
67 const char *txt_filename = NULL, *bin_filename = NULL;
69 unsigned char *dataptr, *envptr;
70 unsigned char *filebuf = NULL;
71 unsigned int filesize = 0, envsize = 0, datasize = 0;
74 unsigned char padbyte = 0xff;
77 int ret = EXIT_SUCCESS;
79 struct stat txt_file_stat;
83 /* Turn off getopt()'s internal error message */
86 /* Parse the cmdline */
87 while ((option = getopt(argc, argv, ":s:o:rbp:h")) != -1) {
90 datasize = strtol(optarg, NULL, 0);
93 bin_filename = strdup(optarg);
95 fprintf(stderr, "Can't strdup() the output "
107 padbyte = strtol(optarg, NULL, 0);
113 fprintf(stderr, "Missing argument for option -%c\n",
118 fprintf(stderr, "Wrong option -%c\n", optopt);
124 /* Check datasize and allocate the data */
127 "Please specify the size of the environment "
133 dataptr = malloc(datasize * sizeof(*dataptr));
135 fprintf(stderr, "Can't alloc dataptr.\n");
140 * envptr points to the beginning of the actual environment (after the
141 * crc and possible `redundant' bit
143 envsize = datasize - (CRC_SIZE + redundant);
144 envptr = dataptr + CRC_SIZE + redundant;
146 /* Pad the environment with the padding byte */
147 memset(envptr, padbyte, envsize);
149 /* Open the input file ... */
150 if (optind >= argc) {
151 fprintf(stderr, "Please specify an input filename\n");
155 txt_filename = argv[optind];
156 if (strcmp(txt_filename, "-") == 0) {
158 int readlen = sizeof(*envptr) * 2048;
159 txt_fd = STDIN_FILENO;
162 filebuf = realloc(filebuf, readlen);
163 readbytes = read(txt_fd, filebuf + filesize, readlen);
164 filesize += readbytes;
165 } while (readbytes == readlen);
168 txt_fd = open(txt_filename, O_RDONLY);
170 fprintf(stderr, "Can't open \"%s\": %s\n",
171 txt_filename, strerror(errno));
174 /* ... and check it */
175 ret = fstat(txt_fd, &txt_file_stat);
177 fprintf(stderr, "Can't stat() on \"%s\": "
178 "%s\n", txt_filename, strerror(errno));
182 filesize = txt_file_stat.st_size;
183 /* Read the raw input file and transform it */
184 filebuf = malloc(sizeof(*envptr) * filesize);
185 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
186 if (ret != sizeof(*envptr) * filesize) {
187 fprintf(stderr, "Can't read the whole input file\n");
193 * The right test to do is "=>" (not ">") because of the additional
194 * ending \0. See below.
196 if (filesize >= envsize) {
197 fprintf(stderr, "The input file is larger than the "
198 "environment partition size\n");
202 /* Replace newlines separating variables with \0 */
203 for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
204 if (filebuf[fp] == '\n') {
207 * Newline at the beginning of the file ?
211 } else if (filebuf[fp-1] == '\\') {
213 * Embedded newline in a variable.
215 * The backslash was added to the envptr ;
216 * rewind and replace it with a newline
221 /* End of a variable */
224 } else if (filebuf[fp] == '#') {
225 if (fp != 0 && filebuf[fp-1] == '\n') {
226 /* This line is a comment, let's skip it */
227 while (fp < txt_file_stat.st_size && fp++ &&
228 filebuf[fp] != '\n');
230 envptr[ep++] = filebuf[fp];
233 envptr[ep++] = filebuf[fp];
237 * Make sure there is a final '\0'
238 * And do it again on the next byte to mark the end of the environment.
240 if (envptr[ep-1] != '\0') {
243 * The text file doesn't have an ending newline. We need to
244 * check the env size again to make sure we have room for two \0
247 fprintf(stderr, "The environment file is too large for "
248 "the target environment storage\n");
256 /* Computes the CRC and put it at the beginning of the data */
257 crc = crc32(0, envptr, envsize);
258 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
260 memcpy(dataptr, &targetendian_crc, sizeof(uint32_t));
262 bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
264 fprintf(stderr, "Can't open output file \"%s\": %s\n",
265 bin_filename, strerror(errno));
269 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
270 sizeof(*dataptr) * datasize) {
271 fprintf(stderr, "write() failed: %s\n", strerror(errno));