| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini ar implementation for busybox |
| * |
| * Copyright (C) 2000 by Glenn McGrath |
| * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000 |
| * |
| * Modified 8 August 2000 by Glenn McGrath |
| * - now uses getopt |
| * - moved copySubFile function to utilities.c |
| * - creates linked list of all headers |
| * - easily accessable to other busybox functions |
| * |
| * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar. |
| * |
| * 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 |
| * 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 |
| * |
| * Last modified 25 August 2000 |
| */ |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <ctype.h> |
| #include <time.h> |
| #include <utime.h> |
| #include <sys/types.h> |
| #include "internal.h" |
| |
| #define BLOCK_SIZE 60 |
| #define PRESERVE_DATE 1 /* preserve original dates */ |
| #define VERBOSE 2 /* be verbose */ |
| #define DISPLAY 4 /* display contents */ |
| #define EXT_TO_FILE 8 /* extract contents of archive */ |
| #define EXT_TO_STDOUT 16 /* extract to stdout */ |
| |
| #define BB_DECLARE_EXTERN |
| #define bb_need_io_error |
| #include "messages.c" |
| |
| typedef struct rawArHeader { /* Byte Offset */ |
| char name[16]; /* 0-15 */ |
| char date[12]; /* 16-27 */ |
| char uid[6], gid[6]; /* 28-39 */ |
| char mode[8]; /* 40-47 */ |
| char size[10]; /* 48-57 */ |
| char fmag[2]; /* 58-59 */ |
| } rawArHeader_t; |
| |
| typedef struct headerL { |
| char name[16]; |
| size_t size; |
| uid_t uid; |
| gid_t gid; |
| mode_t mode; |
| time_t mtime; |
| off_t offset; |
| struct headerL *next; |
| } headerL_t; |
| |
| /* |
| * populate linked list with all ar file entries and offset |
| */ |
| static int parseArArchive(int srcFd, headerL_t *current) |
| { |
| off_t lastOffset=0, thisOffset=0; |
| char arVersion[8]; |
| rawArHeader_t rawArHeader; |
| |
| lseek(srcFd, 0, SEEK_SET); |
| if (fullRead(srcFd, arVersion, 8) <= 0) { |
| errorMsg("Invalid header magic\n"); |
| return (FALSE); |
| } |
| if (strncmp(arVersion,"!<arch>",7) != 0) { |
| errorMsg("This doesnt appear to be an ar archive\n"); |
| return(FALSE); |
| } |
| while (fullRead(srcFd, (char *) &rawArHeader, 60) == 60) { |
| if ( (rawArHeader.fmag[0] == '`') && |
| (rawArHeader.fmag[1] == '\n')) { |
| sscanf(rawArHeader.name, "%s", current->name); |
| parse_mode(rawArHeader.mode, ¤t->mode); |
| current->mtime = atoi(rawArHeader.date); |
| current->uid = atoi(rawArHeader.uid); |
| current->gid = atoi(rawArHeader.gid); |
| current->size = (size_t) atoi(rawArHeader.size); |
| current->offset = lseek(srcFd, 0 , SEEK_CUR); |
| current->next = (headerL_t *) xmalloc(sizeof(headerL_t)); |
| lastOffset = lseek(srcFd, (off_t) current->size, SEEK_CUR); |
| current = current->next; |
| } |
| else { /* GNU ar has an extra char after data */ |
| thisOffset=lseek(srcFd, 0, SEEK_CUR); |
| if ( (thisOffset - lastOffset) > ((off_t) 61) ) |
| return(FALSE); |
| lseek(srcFd, thisOffset - 59, SEEK_SET); |
| } |
| } |
| return(FALSE); |
| } |
| |
| /* |
| * return the headerL_t struct for the specified filename |
| */ |
| static headerL_t *getSubFileHeader(int srcFd, const char filename[16]) |
| { |
| headerL_t *list; |
| list = xmalloc(sizeof(headerL_t)); |
| |
| parseArArchive(srcFd, list); |
| while (list->next != NULL) { |
| if (strncmp(list->name, filename, strlen(filename))==0) |
| return(list); |
| list=list->next; |
| } |
| return(NULL); |
| } |
| |
| /* |
| * populate linked list with all ar file entries and offset |
| */ |
| static int displayEntry(int srcFd, const char filename[16], int funct) |
| { |
| headerL_t *file; |
| |
| if ((file = getSubFileHeader(srcFd, filename)) == NULL) |
| return(FALSE); |
| if ((funct & VERBOSE) == VERBOSE) { |
| printf("%s %d/%d %8d %s ", modeString(file->mode), file->uid, file->gid, file->size, timeString(file->mtime)); |
| } |
| printf("%s\n", file->name); |
| return(TRUE); |
| } |
| |
| static int extractAr(int srcFd, int dstFd, const char filename[16]) |
| { |
| headerL_t *file; |
| |
| if ( (file = getSubFileHeader(srcFd, filename)) == NULL) |
| return(FALSE); |
| lseek(srcFd, file->offset, SEEK_SET); |
| if (copySubFile(srcFd, dstFd, (size_t) file->size) == TRUE) |
| return(TRUE); |
| return(FALSE); |
| } |
| |
| extern int ar_main(int argc, char **argv) |
| { |
| int funct = 0, opt=0; |
| int srcFd=0, dstFd=0; |
| |
| while ((opt = getopt(argc, argv, "ovt:p:x:")) != -1) { |
| switch (opt) { |
| case 'o': |
| funct = funct | PRESERVE_DATE; |
| break; |
| case 'v': |
| funct = funct | VERBOSE; |
| break; |
| case 't': |
| funct = funct | DISPLAY; |
| case 'x': |
| if (opt=='x') { |
| funct = funct | EXT_TO_FILE; |
| } |
| case 'p': |
| if (opt=='p') { |
| funct = funct | EXT_TO_STDOUT; |
| } |
| /* following is common to 't','x' and 'p' */ |
| if (optarg == NULL) { |
| printf("expected a filename\n"); |
| return(FALSE); |
| } |
| if ( (srcFd = open(optarg, O_RDONLY)) < 0) { |
| errorMsg("Cannot read %s\n", optarg); |
| return (FALSE); |
| } |
| break; |
| default: |
| usage(ar_usage); |
| } |
| } |
| |
| /* check options not just preserve_dates and/or verbose */ |
| if (funct < 4) { |
| usage(ar_usage); |
| return(FALSE); |
| } |
| |
| /* find files to extract */ |
| if (optind<argc) |
| for(; optind < argc; optind++) { |
| if ( (funct & EXT_TO_FILE) == EXT_TO_FILE) { |
| dstFd = open(argv[optind], O_WRONLY | O_CREAT); |
| extractAr(srcFd, dstFd, argv[optind]); |
| } |
| if ( (funct & EXT_TO_STDOUT) == EXT_TO_STDOUT) |
| extractAr(srcFd, fileno(stdout), argv[optind]); |
| if ( (funct & DISPLAY) == DISPLAY) |
| displayEntry(srcFd, argv[optind], funct); |
| } |
| return (TRUE); |
| } |