| 1 | /* |
| 2 | * Copyright (C) 2011 Vasilis Tsiligiannis <b_tsiligiannis@silverton.gr> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License as |
| 6 | * published by the Free Software Foundation; either version 2 of the |
| 7 | * License, or (at your option) any later version. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | #include <stdlib.h> |
| 13 | #include <string.h> |
| 14 | #include <libgen.h> |
| 15 | #include <getopt.h> |
| 16 | #include <errno.h> |
| 17 | #include <sys/stat.h> |
| 18 | #include <endian.h> /* for __BYTE_ORDER */ |
| 19 | |
| 20 | #if (__BYTE_ORDER == __LITTLE_ENDIAN) |
| 21 | # define HOST_TO_LE16(x) (x) |
| 22 | # define HOST_TO_LE32(x) (x) |
| 23 | #else |
| 24 | # define HOST_TO_LE16(x) bswap_16(x) |
| 25 | # define HOST_TO_LE32(x) bswap_32(x) |
| 26 | #endif |
| 27 | |
| 28 | struct header |
| 29 | { |
| 30 | unsigned char sign[4]; |
| 31 | unsigned int start; |
| 32 | unsigned int flash; |
| 33 | unsigned char model[4]; |
| 34 | unsigned int size; |
| 35 | } __attribute__ ((packed)); |
| 36 | |
| 37 | struct finfo |
| 38 | { |
| 39 | char *name; |
| 40 | off_t size; |
| 41 | }; |
| 42 | |
| 43 | struct buf |
| 44 | { |
| 45 | char *start; |
| 46 | size_t size; |
| 47 | }; |
| 48 | |
| 49 | static char *progname; |
| 50 | |
| 51 | static void usage(int status) |
| 52 | { |
| 53 | FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout; |
| 54 | |
| 55 | fprintf(stream, "Usage: %s [OPTIONS...]\n", progname); |
| 56 | fprintf(stream, |
| 57 | "\n" |
| 58 | "Options:\n" |
| 59 | " -s <sig> set image signature to <sig>\n" |
| 60 | " -m <model> set model to <model>\n" |
| 61 | " -i <file> read input from file <file>\n" |
| 62 | " -o <file> write output to file <file>\n" |
| 63 | " -f <flash> set flash address to <flash>\n" |
| 64 | " -S <start> set start address to <start>\n"); |
| 65 | |
| 66 | exit(status); |
| 67 | } |
| 68 | |
| 69 | static int strtou32(char *arg, unsigned int *val) |
| 70 | { |
| 71 | char *endptr = NULL; |
| 72 | |
| 73 | errno = 0; |
| 74 | *val = strtoul(arg, &endptr, 0); |
| 75 | if (errno || (endptr == arg) || (*endptr && (endptr != NULL))) { |
| 76 | return EXIT_SUCCESS; |
| 77 | } |
| 78 | |
| 79 | return EXIT_FAILURE; |
| 80 | } |
| 81 | |
| 82 | static unsigned short fwcsum (struct buf *buf) { |
| 83 | int i; |
| 84 | unsigned short ret = 0; |
| 85 | |
| 86 | for (i = 0; i < buf->size / 2; i++) |
| 87 | ret -= ((unsigned short *) buf->start)[i]; |
| 88 | |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | static int fwread(struct finfo *finfo, struct buf *buf) |
| 93 | { |
| 94 | FILE *f; |
| 95 | |
| 96 | f = fopen(finfo->name, "r"); |
| 97 | if (!f) { |
| 98 | fprintf(stderr, "could not open \"%s\" for reading\n", finfo->name); |
| 99 | usage(EXIT_FAILURE); |
| 100 | } |
| 101 | |
| 102 | buf->size = fread(buf->start, 1, finfo->size, f); |
| 103 | if (buf->size != finfo->size) { |
| 104 | fprintf(stderr, "unable to read from file \"%s\"\n", finfo->name); |
| 105 | usage(EXIT_FAILURE); |
| 106 | } |
| 107 | |
| 108 | fclose(f); |
| 109 | |
| 110 | return EXIT_SUCCESS; |
| 111 | } |
| 112 | |
| 113 | static int fwwrite(struct finfo *finfo, struct buf *buf) |
| 114 | { |
| 115 | FILE *f; |
| 116 | |
| 117 | f = fopen(finfo->name, "w"); |
| 118 | if (!f) { |
| 119 | fprintf(stderr, "could not open \"%s\" for writing\n", finfo->name); |
| 120 | usage(EXIT_FAILURE); |
| 121 | } |
| 122 | |
| 123 | buf->size = fwrite(buf->start, 1, finfo->size, f); |
| 124 | if (buf->size != finfo->size) { |
| 125 | fprintf(stderr, "unable to write to file \"%s\"\n", finfo->name); |
| 126 | usage(EXIT_FAILURE); |
| 127 | } |
| 128 | |
| 129 | fclose(f); |
| 130 | |
| 131 | return EXIT_SUCCESS; |
| 132 | } |
| 133 | |
| 134 | int main(int argc, char **argv) |
| 135 | { |
| 136 | struct stat st; |
| 137 | struct header header; |
| 138 | struct buf ibuf, obuf; |
| 139 | struct finfo ifinfo, ofinfo; |
| 140 | unsigned short csum; |
| 141 | int c; |
| 142 | |
| 143 | ifinfo.name = ofinfo.name = NULL; |
| 144 | header.flash = header.size = header.start = 0; |
| 145 | progname = basename(argv[0]); |
| 146 | |
| 147 | while((c = getopt(argc, argv, "i:o:m:s:f:S:h")) != -1) { |
| 148 | switch (c) { |
| 149 | case 'i': |
| 150 | ifinfo.name = optarg; |
| 151 | break; |
| 152 | case 'o': |
| 153 | ofinfo.name = optarg; |
| 154 | break; |
| 155 | case 'm': |
| 156 | if (strlen(optarg) != 4) { |
| 157 | fprintf(stderr, "model must be 4 characters long\n"); |
| 158 | usage(EXIT_FAILURE); |
| 159 | } |
| 160 | memcpy(header.model, optarg, 4); |
| 161 | break; |
| 162 | case 's': |
| 163 | if (strlen(optarg) != 4) { |
| 164 | fprintf(stderr, "signature must be 4 characters long\n"); |
| 165 | usage(EXIT_FAILURE); |
| 166 | } |
| 167 | memcpy(header.sign, optarg, 4); |
| 168 | break; |
| 169 | case 'h': |
| 170 | usage(EXIT_SUCCESS); |
| 171 | break; |
| 172 | case 'f': |
| 173 | if (!strtou32(optarg, &header.flash)) { |
| 174 | fprintf(stderr, "invalid flash address specified\n"); |
| 175 | usage(EXIT_FAILURE); |
| 176 | } |
| 177 | break; |
| 178 | case 'S': |
| 179 | if (!strtou32(optarg, &header.start)) { |
| 180 | fprintf(stderr, "invalid start address specified\n"); |
| 181 | usage(EXIT_FAILURE); |
| 182 | } |
| 183 | break; |
| 184 | default: |
| 185 | usage(EXIT_FAILURE); |
| 186 | break; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | if (ifinfo.name == NULL) { |
| 191 | fprintf(stderr, "no input file specified\n"); |
| 192 | usage(EXIT_FAILURE); |
| 193 | } |
| 194 | |
| 195 | if (ofinfo.name == NULL) { |
| 196 | fprintf(stderr, "no output file specified\n"); |
| 197 | usage(EXIT_FAILURE); |
| 198 | } |
| 199 | |
| 200 | if (stat(ifinfo.name, &st)) { |
| 201 | fprintf(stderr, "stat failed on %s\n", ifinfo.name); |
| 202 | usage(EXIT_FAILURE); |
| 203 | } |
| 204 | |
| 205 | if (header.sign == NULL) { |
| 206 | fprintf(stderr, "no signature specified\n"); |
| 207 | usage(EXIT_FAILURE); |
| 208 | } |
| 209 | |
| 210 | if (header.model == NULL) { |
| 211 | fprintf(stderr, "no model specified\n"); |
| 212 | usage(EXIT_FAILURE); |
| 213 | } |
| 214 | |
| 215 | if (!header.flash) { |
| 216 | fprintf(stderr, "no flash address specified\n"); |
| 217 | usage(EXIT_FAILURE); |
| 218 | } |
| 219 | |
| 220 | if (!header.start) { |
| 221 | fprintf(stderr, "no start address specified\n"); |
| 222 | usage(EXIT_FAILURE); |
| 223 | } |
| 224 | |
| 225 | ifinfo.size = st.st_size; |
| 226 | |
| 227 | obuf.size = ifinfo.size + sizeof(struct header) + sizeof(unsigned short); |
| 228 | if (obuf.size % sizeof(unsigned short)) |
| 229 | obuf.size++; |
| 230 | |
| 231 | obuf.start = malloc(obuf.size); |
| 232 | if (!obuf.start) { |
| 233 | fprintf(stderr, "no memory for buffer\n"); |
| 234 | usage(EXIT_FAILURE); |
| 235 | } |
| 236 | memset(obuf.start, 0, obuf.size); |
| 237 | |
| 238 | ibuf.size = ifinfo.size; |
| 239 | ibuf.start = obuf.start + sizeof(struct header); |
| 240 | |
| 241 | if (fwread(&ifinfo, &ibuf)) |
| 242 | usage(EXIT_FAILURE); |
| 243 | |
| 244 | header.flash = HOST_TO_LE32(header.flash); |
| 245 | header.size = HOST_TO_LE32(obuf.size - sizeof(struct header)); |
| 246 | header.start = HOST_TO_LE32(header.start); |
| 247 | memcpy (obuf.start, &header, sizeof(struct header)); |
| 248 | |
| 249 | csum = HOST_TO_LE16(fwcsum(&ibuf)); |
| 250 | memcpy(obuf.start + obuf.size - sizeof(unsigned short), |
| 251 | &csum, sizeof(unsigned short)); |
| 252 | |
| 253 | ofinfo.size = obuf.size; |
| 254 | |
| 255 | if (fwwrite(&ofinfo, &obuf)) |
| 256 | usage(EXIT_FAILURE); |
| 257 | |
| 258 | return EXIT_SUCCESS; |
| 259 | } |
| 260 | |
