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annotate miscprog/grokdsn.c @ 191:0c631396b8ce

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started grokdsn utility, parses header successfully
author Michael Spacefalcon <falcon@ivan.Harhan.ORG>
date Wed, 07 Jan 2015 06:55:33 +0000
parents
children 5d84f63eff72
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191
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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1 /*
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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2 * We have TI's Leonardo reference schematics in the form of 3 different PDF
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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3 * versions and an OrCAD DSN file corresponding to one of them. The latter
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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4 * appears (based on a cursory strings(1) inspection) to contain more
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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5 * juicy information than is present in the PDF prints. We need to extract
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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6 * as much of this information as we can in order to replicate the lost
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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7 * Leonardo board as closely as possible.
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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8 *
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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9 * The top level structure of this DSN file appears to be Microsoft CDF.
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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10 * Therefore, I shall begin by parsing this "archive" structure and
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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11 * extracting the individual files contained therein, in an effort to gain
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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12 * more insight as to what goes with what than can be gleaned from strings(1)
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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13 * on the raw DSN file. This hack-utility is my CDF parser written for
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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14 * this specific purpose.
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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15 */
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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16
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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17 #include <sys/types.h>
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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18 #include <sys/file.h>
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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19 #include <sys/stat.h>
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Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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20 #include <sys/mman.h>
0c631396b8ce started grokdsn utility, parses header successfully
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21 #include <stdio.h>
0c631396b8ce started grokdsn utility, parses header successfully
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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 {
0c631396b8ce started grokdsn utility, parses header successfully
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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;
0c631396b8ce started grokdsn utility, parses header successfully
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36 uint16_t sector_size;
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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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;
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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40 uint32_t dir_start;
0c631396b8ce started grokdsn utility, parses header successfully
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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;
0c631396b8ce started grokdsn utility, parses header successfully
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46 uint32_t mfat_sectors;
0c631396b8ce started grokdsn utility, parses header successfully
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47 uint32_t fat_secids[HEADER_MFAT_ENTRIES];
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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48 };
0c631396b8ce started grokdsn utility, parses header successfully
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49
0c631396b8ce started grokdsn utility, parses header successfully
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50 char *dsnfilename;
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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51 u_char *filemapping;
0c631396b8ce started grokdsn utility, parses header successfully
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52 struct cdf_header *cdf_header;
0c631396b8ce started grokdsn utility, parses header successfully
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53 unsigned total_sectors;
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54
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Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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55 open_and_mmap_file()
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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56 {
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Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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57 int fd;
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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58 struct stat st;
0c631396b8ce started grokdsn utility, parses header successfully
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59
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60 fd = open(dsnfilename, O_RDONLY);
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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61 if (fd < 0) {
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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62 perror(dsnfilename);
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63 exit(1);
0c631396b8ce started grokdsn utility, parses header successfully
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64 }
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65 fstat(fd, &st);
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66 if (!S_ISREG(st.st_mode)) {
0c631396b8ce started grokdsn utility, parses header successfully
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67 fprintf(stderr, "error: %s is not a regular file\n",
0c631396b8ce started grokdsn utility, parses header successfully
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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",
0c631396b8ce started grokdsn utility, parses header successfully
Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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73 dsnfilename);
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74 exit(1);
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75 }
0c631396b8ce started grokdsn utility, parses header successfully
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76 if (st.st_size % 512) {
0c631396b8ce started grokdsn utility, parses header successfully
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77 fprintf(stderr, "error: %s is not a multiple of 512 bytes\n",
0c631396b8ce started grokdsn utility, parses header successfully
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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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Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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86 close(fd);
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Michael Spacefalcon <falcon@ivan.Harhan.ORG>
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87 cdf_header = (struct cdf_header *) filemapping;
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88 total_sectors = st.st_size / 512 - 1;
0c631396b8ce started grokdsn utility, parses header successfully
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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),
0c631396b8ce started grokdsn utility, parses header successfully
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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
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111 main(argc, argv)
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112 char **argv;
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113 {
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114 if (sizeof(struct cdf_header) != 512) {
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115 fprintf(stderr, "error: struct cdf_header is misdefined\n");
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116 exit(1);
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117 }
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118 if (argc != 3) {
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119 fprintf(stderr, "usage: %s binfile.dsn <operation>\n", argv[0]);
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120 exit(1);
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121 }
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122 dsnfilename = argv[1];
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123 open_and_mmap_file();
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124 if (!strcmp(argv[2], "hdr"))
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125 return dump_cdf_header();
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126 fprintf(stderr, "error: \"%s\" is not a recognized command\n", argv[2]);
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127 exit(1);
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128 }