/* * 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 <unistd.h> #include "unarchive.h" #include "libbb.h" char get_header_ar(archive_handle_t *archive_handle) { file_header_t *typed = archive_handle->file_header; 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; #ifdef CONFIG_FEATURE_AR_LONG_FILENAMES static char *ar_long_names; static unsigned int ar_long_name_size; #endif /* dont use bb_xread as we want to handle the error ourself */ if (read(archive_handle->src_fd, ar.raw, 60) != 60) { /* End Of File */ return(EXIT_FAILURE); } /* ar header starts on an even byte (2 byte aligned) * '\n' is used for padding */ if (ar.raw[0] == '\n') { /* fix up the header, we started reading 1 byte too early */ memmove(ar.raw, &ar.raw[1], 59); ar.raw[59] = bb_xread_char(archive_handle->src_fd); archive_handle->offset++; } archive_handle->offset += 60; /* align the headers based on the header magic */ if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) { bb_error_msg_and_die("Invalid ar header"); } typed->mode = strtol(ar.formated.mode, NULL, 8); typed->mtime = atoi(ar.formated.date); typed->uid = atoi(ar.formated.uid); typed->gid = atoi(ar.formated.gid); typed->size = atoi(ar.formated.size); /* long filenames have '/' as the first character */ if (ar.formated.name[0] == '/') { #ifdef CONFIG_FEATURE_AR_LONG_FILENAMES 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_name_size = typed->size; ar_long_names = xmalloc(ar_long_name_size); bb_xread_all(archive_handle->src_fd, ar_long_names, ar_long_name_size); archive_handle->offset += ar_long_name_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(archive_handle)); /* Return next header */ } else if (ar.formated.name[1] == ' ') { /* This is the index of symbols in the file for compilers */ data_skip(archive_handle); archive_handle->offset += typed->size; return (get_header_ar(archive_handle)); /* 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 */ const unsigned int long_offset = atoi(&ar.formated.name[1]); if (long_offset >= ar_long_name_size) { bb_error_msg_and_die("Cant resolve long filename"); } typed->name = bb_xstrdup(ar_long_names + long_offset); } #else bb_error_msg_and_die("long filenames not supported"); #endif } else { /* short filenames */ typed->name = bb_xstrndup(ar.formated.name, 16); } typed->name[strcspn(typed->name, " /")] = '\0'; if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { archive_handle->action_header(typed); if (archive_handle->sub_archive) { while (archive_handle->action_data_subarchive(archive_handle->sub_archive) == EXIT_SUCCESS); } else { archive_handle->action_data(archive_handle); } } else { data_skip(archive_handle); } archive_handle->offset += typed->size; /* Set the file pointer to the correct spot, we may have been reading a compressed file */ lseek(archive_handle->src_fd, archive_handle->offset, SEEK_SET); return(EXIT_SUCCESS); }