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annotate pirollback/init.c @ 103:a10acb1688e0

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thumbdis: buglet in the decoding of sub-from-sp
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 31 Mar 2014 01:59:28 +0000
parents 15c2ac2c5c73
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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42
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 #include <sys/types.h>
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2 #include <sys/file.h>
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3 #include <endian.h>
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4 #include <stdio.h>
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5 #include <string.h>
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6 #include <strings.h>
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7 #include <stdlib.h>
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8 #include <unistd.h>
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9 #include "types.h"
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10 #include "struct.h"
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11
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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12 u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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13 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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14
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15 char *imgfile;
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16 u8 image[0x480000];
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17 struct inode_info inode[0x4000];
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18 int last_inode;
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19
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20 static u8 magichdr_first[9] = {'F','f','s','#', 0x10, 0x02, 0xFF, 0xFF, 0xAB};
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21 static u8 magichdr_mid[9] = {'F','f','s','#', 0x10, 0x02, 0xFF, 0xFF, 0xBD};
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22 static u8 magichdr_last[9] = {'F','f','s','#', 0x10, 0x02, 0xFF, 0xFF, 0xBF};
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23
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24 read_img_file()
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25 {
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26 int i, fd, cc;
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27 u8 *blk, *compare;
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28
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29 fd = open(imgfile, O_RDONLY);
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30 if (fd < 0) {
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31 perror(imgfile);
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32 exit(1);
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33 }
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34 cc = read(fd, image, sizeof image);
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35 close(fd);
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36 if (cc != sizeof image) {
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37 inv: fprintf(stderr,
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38 "%s does not appear to be a \"virgin\" Pirelli FFS image\n",
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39 imgfile);
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40 exit(1);
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41 }
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42 for (i = 0; i < 18; i++) {
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43 blk = image + i * 0x40000;
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44 if (i == 0)
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45 compare = magichdr_first;
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46 else if (i == 17)
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47 compare = magichdr_last;
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48 else
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49 compare = magichdr_mid;
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50 if (bcmp(blk, compare, 9))
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51 goto inv;
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52 }
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53 }
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54
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55 static int
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56 convert_ptr(ptr, ino, which)
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57 int ptr, ino;
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58 char *which;
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59 {
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60 if (ptr >= 1 && ptr <= 0x3FFF)
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61 return(ptr);
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62 if (ptr == 0xFFFF)
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63 return(0);
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64 fprintf(stderr, "error in inode #%x: invalid %s pointer\n", ino, which);
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65 exit(1);
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66 }
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67
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68 read_inodes()
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69 {
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70 int ino;
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71 struct inode_flash *fl;
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72 struct inode_info *inf;
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73
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74 for (ino = 1; ino < 0x4000; ino++) {
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75 fl = (struct inode_flash *) image + ino;
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76 if (!bcmp(fl, blank_flash_line, 16))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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77 break;
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78 inf = inode + ino;
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79 inf->flash = fl;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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80 inf->len = le16toh(fl->len);
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81 if (!inf->len) {
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82 fprintf(stderr, "error: inode %x has zero length\n",
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83 ino);
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84 exit(1);
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85 }
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86 if (inf->len & 0xF) {
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87 fprintf(stderr, "error: inode %x has bad length\n",
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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88 ino);
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89 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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90 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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91 inf->type = fl->type;
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92 inf->descend = convert_ptr(le16toh(fl->descend), ino,
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93 "descendant");
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94 inf->sibling = convert_ptr(le16toh(fl->sibling), ino,
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95 "sibling");
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96 inf->rawloc = le32toh(fl->dataptr);
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97 if (inf->rawloc >= 0x48000) {
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98 invdptr: fprintf(stderr,
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99 "error: inode %x data pointer is out of bounds\n",
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100 ino);
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101 exit(1);
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102 }
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103 inf->offset = inf->rawloc << 4;
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104 if (inf->offset + inf->len > 0x480000)
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105 goto invdptr;
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106 inf->dataptr = image + inf->offset;
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107 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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108 last_inode = ino - 1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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109 if (!last_inode) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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110 fprintf(stderr, "error: no inodes found!\n");
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111 exit(1);
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112 }
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113 }