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annotate miscprog/grokdsn.c @ 192:5d84f63eff72

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grokdsn: able to follow the FAT chain for the directory
author Michael Spacefalcon <falcon@ivan.Harhan.ORG>
date Wed, 07 Jan 2015 07:12:51 +0000
parents 0c631396b8ce
children 37f78f986a0a
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191
0c631396b8ce started grokdsn utility, parses header successfully
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1 /*
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2 * We have TI's Leonardo reference schematics in the form of 3 different PDF
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3 * versions and an OrCAD DSN file corresponding to one of them. The latter
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4 * appears (based on a cursory strings(1) inspection) to contain more
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5 * juicy information than is present in the PDF prints. We need to extract
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6 * as much of this information as we can in order to replicate the lost
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7 * Leonardo board as closely as possible.
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8 *
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9 * The top level structure of this DSN file appears to be Microsoft CDF.
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10 * Therefore, I shall begin by parsing this "archive" structure and
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11 * extracting the individual files contained therein, in an effort to gain
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12 * more insight as to what goes with what than can be gleaned from strings(1)
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13 * on the raw DSN file. This hack-utility is my CDF parser written for
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14 * this specific purpose.
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15 */
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16
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17 #include <sys/types.h>
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18 #include <sys/file.h>
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19 #include <sys/stat.h>
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20 #include <sys/mman.h>
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21 #include <stdio.h>
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22 #include <stdint.h>
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23 #include <endian.h>
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24 #include <stdlib.h>
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25 #include <unistd.h>
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26 #include <string.h>
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27 #include <strings.h>
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28
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29 #define HEADER_MFAT_ENTRIES 109
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30 struct cdf_header {
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31 u_char magic[8];
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32 u_char uid[16];
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33 uint16_t fmt_minor;
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34 uint16_t fmt_major;
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35 uint16_t byte_order;
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36 uint16_t sector_size;
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37 uint16_t subsec_size;
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38 u_char rsvd1[10];
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39 uint32_t fat_sectors;
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40 uint32_t dir_start;
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41 u_char rsvd2[4];
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42 uint32_t min_large_file;
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43 uint32_t subfat_start;
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44 uint32_t subfat_sectors;
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45 uint32_t mfat_start;
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46 uint32_t mfat_sectors;
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47 uint32_t fat_secids[HEADER_MFAT_ENTRIES];
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48 };
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49
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50 char *dsnfilename;
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51 u_char *filemapping;
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52 struct cdf_header *cdf_header;
192
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53 unsigned total_sectors, fat_nsectors;
191
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54
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55 open_and_mmap_file()
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56 {
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57 int fd;
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58 struct stat st;
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59
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60 fd = open(dsnfilename, O_RDONLY);
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61 if (fd < 0) {
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62 perror(dsnfilename);
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63 exit(1);
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64 }
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65 fstat(fd, &st);
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66 if (!S_ISREG(st.st_mode)) {
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67 fprintf(stderr, "error: %s is not a regular file\n",
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68 dsnfilename);
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69 exit(1);
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70 }
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71 if (st.st_size < 512) {
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72 fprintf(stderr, "error: %s is shorter than 512 bytes\n",
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73 dsnfilename);
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74 exit(1);
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75 }
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76 if (st.st_size % 512) {
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77 fprintf(stderr, "error: %s is not a multiple of 512 bytes\n",
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78 dsnfilename);
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79 exit(1);
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80 }
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81 filemapping = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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82 if (filemapping == MAP_FAILED) {
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83 perror("mmap");
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84 exit(1);
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85 }
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86 close(fd);
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87 cdf_header = (struct cdf_header *) filemapping;
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88 total_sectors = st.st_size / 512 - 1;
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89 return(0);
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90 }
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91
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92 dump_cdf_header()
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93 {
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94 printf("Magic: %02X %02X %02X %02X %02X %02X %02X %02X\n",
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95 cdf_header->magic[0], cdf_header->magic[1],
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96 cdf_header->magic[2], cdf_header->magic[3],
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97 cdf_header->magic[4], cdf_header->magic[5],
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98 cdf_header->magic[6], cdf_header->magic[7]);
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99 printf("Format version: %04X.%04X\n", le16toh(cdf_header->fmt_major),
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100 le16toh(cdf_header->fmt_minor));
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101 printf("Sector / subsector shift: %u / %u\n",
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102 le16toh(cdf_header->sector_size),
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103 le16toh(cdf_header->subsec_size));
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104 printf("Total FAT sectors: %u\n", le32toh(cdf_header->fat_sectors));
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105 printf("Directory start sector: %u\n", le32toh(cdf_header->dir_start));
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106 printf("File size threshold: %u\n",
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107 le32toh(cdf_header->min_large_file));
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108 return(0);
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109 }
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110
192
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111 u_char *
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112 get_sector_ptr(secid)
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113 unsigned secid;
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114 {
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115 if (secid > total_sectors) {
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116 fprintf(stderr,
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117 "error: request for sector #%u; we only have %u in total\n",
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118 secid, total_sectors);
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119 exit(1);
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120 }
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121 return filemapping + (secid + 1) * 512;
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122 }
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123
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124 init_fat_access()
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125 {
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126 fat_nsectors = le32toh(cdf_header->fat_sectors);
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127 if (fat_nsectors > HEADER_MFAT_ENTRIES) {
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128 fprintf(stderr, "error: large FAT not supported\n");
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129 exit(1);
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130 }
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131 return(0);
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132 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
133
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
134 u_char *
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
135 get_fat_sector(fat_sec_no)
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
136 unsigned fat_sec_no;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
137 {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
138 unsigned secid;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
139
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
140 if (fat_sec_no > fat_nsectors) {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
141 fprintf(stderr,
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
142 "error: request for FAT sector #%u; we only have %u in total\n",
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
143 fat_sec_no, fat_nsectors);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
144 exit(1);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
145 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
146 secid = le32toh(cdf_header->fat_secids[fat_sec_no]);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
147 return get_sector_ptr(secid);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
148 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
149
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
150 int32_t
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
151 get_fat_entry(entry_no)
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
152 unsigned entry_no;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
153 {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
154 unsigned fat_sec_no, entry_in_sec;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
155 uint32_t *fat_sector;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
156
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
157 fat_sec_no = entry_no / 128;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
158 entry_in_sec = entry_no % 128;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
159 fat_sector = (uint32_t *) get_fat_sector(fat_sec_no);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
160 return le32toh(fat_sector[entry_in_sec]);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
161 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
162
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
163 dump_fat_chain(sarg)
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
164 char *sarg;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
165 {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
166 int i, n;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
167
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
168 init_fat_access();
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
169 i = atoi(sarg);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
170 while (i >= 0) {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
171 n = get_fat_entry(i);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
172 printf("FAT[%d] = %d\n", i, n);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
173 i = n;
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
174 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
175 return(0);
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
176 }
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
177
191
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
178 main(argc, argv)
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
179 char **argv;
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
180 {
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
181 if (sizeof(struct cdf_header) != 512) {
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
182 fprintf(stderr, "error: struct cdf_header is misdefined\n");
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
183 exit(1);
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
184 }
192
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
185 if (argc < 3) {
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
186 fprintf(stderr, "usage: %s binfile.dsn <op> [args]\n", argv[0]);
191
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
187 exit(1);
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
188 }
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
189 dsnfilename = argv[1];
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
190 open_and_mmap_file();
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
191 if (!strcmp(argv[2], "hdr"))
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
192 return dump_cdf_header();
192
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
193 if (!strcmp(argv[2], "fatchain"))
5d84f63eff72 grokdsn: able to follow the FAT chain for the directory
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents: 191
diff changeset
194 return dump_fat_chain(argv[3]);
191
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
195 fprintf(stderr, "error: \"%s\" is not a recognized command\n", argv[2]);
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
196 exit(1);
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
parents:
diff changeset
197 }