| [821] | 1 | /* Copyright 2001 Glenn McGrath.
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| 2 | *
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | #include <stdio.h>
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| 7 | #include <stdlib.h>
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| 8 | #include <string.h>
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| 9 | #include <unistd.h>
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| 10 | #include "unarchive.h"
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| 11 | #include "libbb.h"
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| 12 |
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| 13 | char get_header_ar(archive_handle_t *archive_handle)
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| 14 | {
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| 15 | file_header_t *typed = archive_handle->file_header;
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| 16 | union {
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| 17 | char raw[60];
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| 18 | struct {
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| 19 | char name[16];
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| 20 | char date[12];
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| 21 | char uid[6];
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| 22 | char gid[6];
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| 23 | char mode[8];
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| 24 | char size[10];
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| 25 | char magic[2];
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| 26 | } formated;
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| 27 | } ar;
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| 28 | #ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
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| 29 | static char *ar_long_names;
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| 30 | static unsigned int ar_long_name_size;
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| 31 | #endif
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| 32 |
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| 33 | /* dont use bb_xread as we want to handle the error ourself */
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| 34 | if (read(archive_handle->src_fd, ar.raw, 60) != 60) {
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| 35 | /* End Of File */
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| 36 | return(EXIT_FAILURE);
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| 37 | }
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| 38 |
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| 39 | /* ar header starts on an even byte (2 byte aligned)
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| 40 | * '\n' is used for padding
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| 41 | */
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| 42 | if (ar.raw[0] == '\n') {
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| 43 | /* fix up the header, we started reading 1 byte too early */
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| 44 | memmove(ar.raw, &ar.raw[1], 59);
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| 45 | ar.raw[59] = bb_xread_char(archive_handle->src_fd);
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| 46 | archive_handle->offset++;
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| 47 | }
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| 48 | archive_handle->offset += 60;
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| 49 |
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| 50 | /* align the headers based on the header magic */
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| 51 | if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
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| 52 | bb_error_msg_and_die("Invalid ar header");
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| 53 | }
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| 54 |
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| 55 | typed->mode = strtol(ar.formated.mode, NULL, 8);
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| 56 | typed->mtime = atoi(ar.formated.date);
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| 57 | typed->uid = atoi(ar.formated.uid);
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| 58 | typed->gid = atoi(ar.formated.gid);
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| 59 | typed->size = atoi(ar.formated.size);
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| 60 |
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| 61 | /* long filenames have '/' as the first character */
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| 62 | if (ar.formated.name[0] == '/') {
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| 63 | #ifdef CONFIG_FEATURE_AR_LONG_FILENAMES
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| 64 | if (ar.formated.name[1] == '/') {
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| 65 | /* If the second char is a '/' then this entries data section
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| 66 | * stores long filename for multiple entries, they are stored
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| 67 | * in static variable long_names for use in future entries */
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| 68 | ar_long_name_size = typed->size;
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| 69 | ar_long_names = xmalloc(ar_long_name_size);
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| 70 | bb_xread_all(archive_handle->src_fd, ar_long_names, ar_long_name_size);
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| 71 | archive_handle->offset += ar_long_name_size;
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| 72 | /* This ar entries data section only contained filenames for other records
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| 73 | * they are stored in the static ar_long_names for future reference */
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| 74 | return (get_header_ar(archive_handle)); /* Return next header */
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| 75 | } else if (ar.formated.name[1] == ' ') {
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| 76 | /* This is the index of symbols in the file for compilers */
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| 77 | data_skip(archive_handle);
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| 78 | archive_handle->offset += typed->size;
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| 79 | return (get_header_ar(archive_handle)); /* Return next header */
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| 80 | } else {
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| 81 | /* The number after the '/' indicates the offset in the ar data section
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| 82 | (saved in variable long_name) that conatains the real filename */
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| 83 | const unsigned int long_offset = atoi(&ar.formated.name[1]);
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| 84 | if (long_offset >= ar_long_name_size) {
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| 85 | bb_error_msg_and_die("Cant resolve long filename");
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| 86 | }
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| 87 | typed->name = bb_xstrdup(ar_long_names + long_offset);
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| 88 | }
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| 89 | #else
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| 90 | bb_error_msg_and_die("long filenames not supported");
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| 91 | #endif
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| 92 | } else {
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| 93 | /* short filenames */
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| 94 | typed->name = bb_xstrndup(ar.formated.name, 16);
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| 95 | }
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| 96 |
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| 97 | typed->name[strcspn(typed->name, " /")] = '\0';
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| 98 |
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| 99 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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| 100 | archive_handle->action_header(typed);
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| 101 | if (archive_handle->sub_archive) {
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| 102 | while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS);
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| 103 | } else {
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| 104 | archive_handle->action_data(archive_handle);
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| 105 | }
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| 106 | } else {
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| 107 | data_skip(archive_handle);
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| 108 | }
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| 109 |
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| 110 | archive_handle->offset += typed->size;
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| 111 | /* Set the file pointer to the correct spot, we may have been reading a compressed file */
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| 112 | lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET);
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| 113 |
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| 114 | return(EXIT_SUCCESS);
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| 115 | }
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