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