/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Library General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "unarchive.h" #include "libbb.h" file_header_t *get_header_ar(FILE *src_stream) { file_header_t *typed; union { char raw[60]; struct { char name[16]; char date[12]; char uid[6]; char gid[6]; char mode[8]; char size[10]; char magic[2]; } formated; } ar; static char *ar_long_names; if (fread(ar.raw, 1, 60, src_stream) != 60) { return(NULL); } archive_offset += 60; /* align the headers based on the header magic */ if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) { /* some version of ar, have an extra '\n' after each data entry, * this puts the next header out by 1 */ if (ar.formated.magic[1] != '`') { error_msg("Invalid magic"); return(NULL); } /* read the next char out of what would be the data section, * if its a '\n' then it is a valid header offset by 1*/ archive_offset++; if (fgetc(src_stream) != '\n') { error_msg("Invalid magic"); return(NULL); } /* fix up the header, we started reading 1 byte too early */ /* raw_header[60] wont be '\n' as it should, but it doesnt matter */ memmove(ar.raw, &ar.raw[1], 59); } typed = (file_header_t *) xcalloc(1, sizeof(file_header_t)); typed->size = (size_t) atoi(ar.formated.size); /* long filenames have '/' as the first character */ if (ar.formated.name[0] == '/') { if (ar.formated.name[1] == '/') { /* If the second char is a '/' then this entries data section * stores long filename for multiple entries, they are stored * in static variable long_names for use in future entries */ ar_long_names = (char *) xrealloc(ar_long_names, typed->size); fread(ar_long_names, 1, typed->size, src_stream); archive_offset += typed->size; /* This ar entries data section only contained filenames for other records * they are stored in the static ar_long_names for future reference */ return (get_header_ar(src_stream)); /* Return next header */ } else if (ar.formated.name[1] == ' ') { /* This is the index of symbols in the file for compilers */ seek_sub_file(src_stream, typed->size); return (get_header_ar(src_stream)); /* Return next header */ } else { /* The number after the '/' indicates the offset in the ar data section (saved in variable long_name) that conatains the real filename */ if (!ar_long_names) { error_msg("Cannot resolve long file name"); return (NULL); } typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1])); } } else { /* short filenames */ typed->name = xcalloc(1, 16); strncpy(typed->name, ar.formated.name, 16); } typed->name[strcspn(typed->name, " /")]='\0'; /* convert the rest of the now valid char header to its typed struct */ parse_mode(ar.formated.mode, &typed->mode); typed->mtime = atoi(ar.formated.date); typed->uid = atoi(ar.formated.uid); typed->gid = atoi(ar.formated.gid); return(typed); }