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