| 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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