1 /* 2 * (C) Copyright 2011 Free Electrons 3 * David Wagner <david.wagner@free-electrons.com> 4 * 5 * Inspired from envcrc.c: 6 * (C) Copyright 2001 7 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it 8 * 9 * See file CREDITS for list of people who contributed to this 10 * project. 11 * 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. 16 * 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. 21 * 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, 25 * MA 02111-1307 USA 26 */ 27 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <stdio.h> 31 #include <stdint.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <compiler.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 38 #include <u-boot/crc.h> 39 40 #define CRC_SIZE sizeof(uint32_t) 41 42 static void usage(const char *exec_name) 43 { 44 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] " 45 "-s <environment partition size> -o <output> <input file>\n" 46 "\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" 50 "\n" 51 "\tThe input file is in format:\n" 52 "\t\tkey1=value1\n" 53 "\t\tkey2=value2\n" 54 "\t\t...\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 " 58 "0xff bytes\n" 59 "\n" 60 "If the input file is \"-\", data is read from standard input\n", 61 exec_name); 62 } 63 64 int main(int argc, char **argv) 65 { 66 uint32_t crc, targetendian_crc; 67 const char *txt_filename = NULL, *bin_filename = NULL; 68 int txt_fd, bin_fd; 69 unsigned char *dataptr, *envptr; 70 unsigned char *filebuf = NULL; 71 unsigned int filesize = 0, envsize = 0, datasize = 0; 72 int bigendian = 0; 73 int redundant = 0; 74 unsigned char padbyte = 0xff; 75 76 int option; 77 int ret = EXIT_SUCCESS; 78 79 struct stat txt_file_stat; 80 81 int fp, ep; 82 83 /* Parse the cmdline */ 84 while ((option = getopt(argc, argv, "s:o:rbp:h")) != -1) { 85 switch (option) { 86 case 's': 87 datasize = strtol(optarg, NULL, 0); 88 break; 89 case 'o': 90 bin_filename = strdup(optarg); 91 if (!bin_filename) { 92 fprintf(stderr, "Can't strdup() the output " 93 "filename\n"); 94 return EXIT_FAILURE; 95 } 96 break; 97 case 'r': 98 redundant = 1; 99 break; 100 case 'b': 101 bigendian = 1; 102 break; 103 case 'p': 104 padbyte = strtol(optarg, NULL, 0); 105 break; 106 case 'h': 107 usage(argv[0]); 108 return EXIT_SUCCESS; 109 default: 110 fprintf(stderr, "Wrong option -%c\n", option); 111 usage(argv[0]); 112 return EXIT_FAILURE; 113 } 114 } 115 116 /* Check datasize and allocate the data */ 117 if (datasize == 0) { 118 fprintf(stderr, 119 "Please specify the size of the envrionnment " 120 "partition.\n"); 121 usage(argv[0]); 122 return EXIT_FAILURE; 123 } 124 125 dataptr = malloc(datasize * sizeof(*dataptr)); 126 if (!dataptr) { 127 fprintf(stderr, "Can't alloc dataptr.\n"); 128 return EXIT_FAILURE; 129 } 130 131 /* 132 * envptr points to the beginning of the actual environment (after the 133 * crc and possible `redundant' bit 134 */ 135 envsize = datasize - (CRC_SIZE + redundant); 136 envptr = dataptr + CRC_SIZE + redundant; 137 138 /* Pad the environment with the padding byte */ 139 memset(envptr, padbyte, envsize); 140 141 /* Open the input file ... */ 142 if (optind >= argc) { 143 fprintf(stderr, "Please specify an input filename\n"); 144 return EXIT_FAILURE; 145 } 146 147 txt_filename = argv[optind]; 148 if (strcmp(txt_filename, "-") == 0) { 149 int readbytes = 0; 150 int readlen = sizeof(*envptr) * 2048; 151 txt_fd = STDIN_FILENO; 152 153 do { 154 filebuf = realloc(filebuf, readlen); 155 readbytes = read(txt_fd, filebuf + filesize, readlen); 156 filesize += readbytes; 157 } while (readbytes == readlen); 158 159 } else { 160 txt_fd = open(txt_filename, O_RDONLY); 161 if (txt_fd == -1) { 162 fprintf(stderr, "Can't open \"%s\": %s\n", 163 txt_filename, strerror(errno)); 164 return EXIT_FAILURE; 165 } 166 /* ... and check it */ 167 ret = fstat(txt_fd, &txt_file_stat); 168 if (ret == -1) { 169 fprintf(stderr, "Can't stat() on \"%s\": " 170 "%s\n", txt_filename, strerror(errno)); 171 return EXIT_FAILURE; 172 } 173 174 filesize = txt_file_stat.st_size; 175 /* Read the raw input file and transform it */ 176 filebuf = malloc(sizeof(*envptr) * filesize); 177 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize); 178 if (ret != sizeof(*envptr) * filesize) { 179 fprintf(stderr, "Can't read the whole input file\n"); 180 return EXIT_FAILURE; 181 } 182 ret = close(txt_fd); 183 } 184 /* 185 * The right test to do is "=>" (not ">") because of the additionnal 186 * ending \0. See below. 187 */ 188 if (filesize >= envsize) { 189 fprintf(stderr, "The input file is larger than the " 190 "envrionnment partition size\n"); 191 return EXIT_FAILURE; 192 } 193 194 /* Replace newlines separating variables with \0 */ 195 for (fp = 0, ep = 0 ; fp < filesize ; fp++) { 196 if (filebuf[fp] == '\n') { 197 if (fp == 0) { 198 /* 199 * Newline at the beggining of the file ? 200 * Ignore it. 201 */ 202 continue; 203 } else if (filebuf[fp-1] == '\\') { 204 /* 205 * Embedded newline in a variable. 206 * 207 * The backslash was added to the envptr ; 208 * rewind and replace it with a newline 209 */ 210 ep--; 211 envptr[ep++] = '\n'; 212 } else { 213 /* End of a variable */ 214 envptr[ep++] = '\0'; 215 } 216 } else if (filebuf[fp] == '#') { 217 if (fp != 0 && filebuf[fp-1] == '\n') { 218 /* This line is a comment, let's skip it */ 219 while (fp < txt_file_stat.st_size && fp++ && 220 filebuf[fp] != '\n'); 221 } else { 222 envptr[ep++] = filebuf[fp]; 223 } 224 } else { 225 envptr[ep++] = filebuf[fp]; 226 } 227 } 228 /* 229 * Make sure there is a final '\0' 230 * And do it again on the next byte to mark the end of the environment. 231 */ 232 if (envptr[ep-1] != '\0') { 233 envptr[ep++] = '\0'; 234 /* 235 * The text file doesn't have an ending newline. We need to 236 * check the env size again to make sure we have room for two \0 237 */ 238 if (ep >= envsize) { 239 fprintf(stderr, "The environment file is too large for " 240 "the target environment storage\n"); 241 return EXIT_FAILURE; 242 } 243 envptr[ep] = '\0'; 244 } else { 245 envptr[ep] = '\0'; 246 } 247 248 /* Computes the CRC and put it at the beginning of the data */ 249 crc = crc32(0, envptr, envsize); 250 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc); 251 252 memcpy(dataptr, &targetendian_crc, sizeof(uint32_t)); 253 254 bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); 255 if (bin_fd == -1) { 256 fprintf(stderr, "Can't open output file \"%s\": %s\n", 257 bin_filename, strerror(errno)); 258 return EXIT_FAILURE; 259 } 260 261 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) != 262 sizeof(*dataptr) * datasize) { 263 fprintf(stderr, "write() failed: %s\n", strerror(errno)); 264 return EXIT_FAILURE; 265 } 266 267 ret = close(bin_fd); 268 269 return ret; 270 } 271