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