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annotate ffstools/tiffs-rd/basics.c @ 229:24ed817dd25d

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tiffs IVA: reads image via mmap and displays block headers
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sat, 25 Jan 2014 23:56:47 +0000
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children ffaa033e7643
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229
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1 /*
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2 * This C module implements the "basics" of TIFFS image analysis.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/file.h>
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7 #include <sys/stat.h>
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8 #include <sys/mman.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include "types.h"
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15
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16 u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02};
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17 u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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18 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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19
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20 extern char *imgfile;
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21 extern u32 eraseblk_size;
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22 extern int total_blocks;
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23 extern u32 total_ffs_size;
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24 extern int index_blk_num, root_node_no;
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25 extern int verbose;
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26
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27 u_char *image;
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28
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29 read_ffs_image()
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30 {
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31 int fd;
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32 struct stat st;
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33
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34 fd = open(imgfile, O_RDONLY);
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35 if (fd < 0) {
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36 perror(imgfile);
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37 exit(1);
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38 }
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39 fstat(fd, &st);
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40 if (!S_ISREG(st.st_mode)) {
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41 fprintf(stderr, "error: %s is not a regular file\n", imgfile);
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42 exit(1);
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43 }
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44 if (st.st_size < total_ffs_size) {
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45 fprintf(stderr,
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46 "error: %s is shorter than FFS size of 0x%lx bytes\n",
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47 imgfile, (u_long)total_ffs_size);
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48 exit(1);
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49 }
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50 image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, 0);
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51 if (image == MAP_FAILED) {
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52 perror("mmap");
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53 exit(1);
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54 }
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55 }
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56
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57 cmd_blkhdr()
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58 {
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59 int blk;
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60 u8 *blkhdr;
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61
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62 read_ffs_image();
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63 for (blk = 0; blk < total_blocks; blk++) {
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64 printf("Block %3d: ", blk);
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65 blkhdr = image + blk * eraseblk_size;
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66 if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) {
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67 printf("No TIFFS header\n");
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68 continue;
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69 }
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70 printf("age %02X%02X, type/status %02X\n",
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71 blkhdr[7], blkhdr[6], blkhdr[8]);
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72 }
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73 exit(0);
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74 }