1 | /* vi: set sw=4 ts=4: */
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2 | /* Copyright 2001 Glenn McGrath.
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3 | *
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4 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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5 | */
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6 |
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7 | #include "libbb.h"
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8 | #include "unarchive.h"
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9 |
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10 | char get_header_ar(archive_handle_t *archive_handle)
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11 | {
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12 | int err;
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13 | file_header_t *typed = archive_handle->file_header;
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14 | union {
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15 | char raw[60];
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16 | struct {
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17 | char name[16];
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18 | char date[12];
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19 | char uid[6];
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20 | char gid[6];
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21 | char mode[8];
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22 | char size[10];
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23 | char magic[2];
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24 | } formatted;
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25 | } ar;
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26 | #if ENABLE_FEATURE_AR_LONG_FILENAMES
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27 | static char *ar_long_names;
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28 | static unsigned ar_long_name_size;
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29 | #endif
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30 |
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31 | /* dont use xread as we want to handle the error ourself */
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32 | if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
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33 | /* End Of File */
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34 | return EXIT_FAILURE;
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35 | }
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36 |
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37 | /* ar header starts on an even byte (2 byte aligned)
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38 | * '\n' is used for padding
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39 | */
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40 | if (ar.raw[0] == '\n') {
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41 | /* fix up the header, we started reading 1 byte too early */
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42 | memmove(ar.raw, &ar.raw[1], 59);
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43 | ar.raw[59] = xread_char(archive_handle->src_fd);
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44 | archive_handle->offset++;
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45 | }
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46 | archive_handle->offset += 60;
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47 |
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48 | /* align the headers based on the header magic */
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49 | if (ar.formatted.magic[0] != '`' || ar.formatted.magic[1] != '\n')
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50 | bb_error_msg_and_die("invalid ar header");
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51 |
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52 | /* FIXME: more thorough routine would be in order here */
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53 | /* (we have something like that in tar) */
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54 | /* but for now we are lax. This code works because */
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55 | /* on misformatted numbers bb_strtou returns all-ones */
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56 | typed->mode = err = bb_strtou(ar.formatted.mode, NULL, 8);
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57 | if (err == -1) bb_error_msg_and_die("invalid ar header");
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58 | typed->mtime = err = bb_strtou(ar.formatted.date, NULL, 10);
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59 | if (err == -1) bb_error_msg_and_die("invalid ar header");
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60 | typed->uid = err = bb_strtou(ar.formatted.uid, NULL, 10);
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61 | if (err == -1) bb_error_msg_and_die("invalid ar header");
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62 | typed->gid = err = bb_strtou(ar.formatted.gid, NULL, 10);
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63 | if (err == -1) bb_error_msg_and_die("invalid ar header");
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64 | typed->size = err = bb_strtou(ar.formatted.size, NULL, 10);
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65 | if (err == -1) bb_error_msg_and_die("invalid ar header");
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66 |
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67 | /* long filenames have '/' as the first character */
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68 | if (ar.formatted.name[0] == '/') {
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69 | #if ENABLE_FEATURE_AR_LONG_FILENAMES
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70 | unsigned long_offset;
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71 |
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72 | if (ar.formatted.name[1] == '/') {
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73 | /* If the second char is a '/' then this entries data section
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74 | * stores long filename for multiple entries, they are stored
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75 | * in static variable long_names for use in future entries */
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76 | ar_long_name_size = typed->size;
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77 | ar_long_names = xmalloc(ar_long_name_size);
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78 | xread(archive_handle->src_fd, ar_long_names, ar_long_name_size);
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79 | archive_handle->offset += ar_long_name_size;
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80 | /* This ar entries data section only contained filenames for other records
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81 | * they are stored in the static ar_long_names for future reference */
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82 | return get_header_ar(archive_handle); /* Return next header */
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83 | }
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84 |
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85 | if (ar.formatted.name[1] == ' ') {
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86 | /* This is the index of symbols in the file for compilers */
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87 | data_skip(archive_handle);
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88 | archive_handle->offset += typed->size;
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89 | return get_header_ar(archive_handle); /* Return next header */
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90 | }
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91 |
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92 | /* The number after the '/' indicates the offset in the ar data section
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93 | * (saved in variable long_name) that conatains the real filename */
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94 | long_offset = atoi(&ar.formatted.name[1]);
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95 | if (long_offset >= ar_long_name_size) {
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96 | bb_error_msg_and_die("can't resolve long filename");
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97 | }
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98 | typed->name = xstrdup(ar_long_names + long_offset);
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99 | #else
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100 | bb_error_msg_and_die("long filenames not supported");
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101 | #endif
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102 | } else {
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103 | /* short filenames */
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104 | typed->name = xstrndup(ar.formatted.name, 16);
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105 | }
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106 |
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107 | typed->name[strcspn(typed->name, " /")] = '\0';
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108 |
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109 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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110 | archive_handle->action_header(typed);
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111 | if (archive_handle->sub_archive) {
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112 | while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS)
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113 | /* repeat */;
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114 | } else {
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115 | archive_handle->action_data(archive_handle);
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116 | }
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117 | } else {
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118 | data_skip(archive_handle);
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119 | }
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120 |
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121 | archive_handle->offset += typed->size;
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122 | /* Set the file pointer to the correct spot, we may have been reading a compressed file */
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123 | lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
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124 |
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125 | return EXIT_SUCCESS;
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126 | }
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