* Mini ar implementation for busybox
*
* Copyright (C) 2000 by Glenn McGrath
- * Written by Glenn McGrath <bug1@netconnect.com.au> 1 June 2000
+ * Written by Glenn McGrath <bug1@optushome.com.au> 1 June 2000
*
* Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
*
* 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 9 September 2000
*/
-#include <stdio.h>
-#include <string.h>
#include <fcntl.h>
-#include <errno.h>
-#include <ctype.h>
-#include <time.h>
-#include <utime.h>
-#include <unistd.h>
#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <malloc.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 RECURSIVE 32
-
-#define MAX_NAME_LENGTH 100
-
-//#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[MAX_NAME_LENGTH];
- size_t size;
- uid_t uid;
- gid_t gid;
- mode_t mode;
- time_t mtime;
- off_t offset;
- struct headerL *next;
-} headerL_t;
-
-/*
- * identify Ar header (magic) and set srcFd to first header entry
- */
-static int checkArMagic(int srcFd)
-{
- char arMagic[8];
- if (fullRead(srcFd, arMagic, 8) != 8)
- return (FALSE);
-
- if (strncmp(arMagic,"!<arch>",7) != 0)
- return(FALSE);
- return(TRUE);
-}
-
-/*
- * read, convert and check the raw ar header
- * srcFd should be pointing to the start of header prior to entry
- * srcFd will be pointing at the start of data after successful exit
- * if returns FALSE srcFd is reset to initial position
- */
-static int readRawArHeader(int srcFd, headerL_t *header)
-{
- rawArHeader_t rawArHeader;
- off_t initialOffset;
- size_t nameLength;
-
- initialOffset = lseek(srcFd, 0, SEEK_CUR);
- if (fullRead(srcFd, (char *) &rawArHeader, 60) != 60) {
- lseek(srcFd, initialOffset, SEEK_SET);
- return(FALSE);
- }
- if ((rawArHeader.fmag[0]!='`') || (rawArHeader.fmag[1]!='\n')) {
- lseek(srcFd, initialOffset, SEEK_SET);
- return(FALSE);
- }
-
- strncpy(header->name, rawArHeader.name, 16);
- nameLength=strcspn(header->name, " \\");
- header->name[nameLength]='\0';
- parse_mode(rawArHeader.mode, &header->mode);
- header->mtime = atoi(rawArHeader.date);
- header->uid = atoi(rawArHeader.uid);
- header->gid = atoi(rawArHeader.gid);
- header->size = (size_t) atoi(rawArHeader.size);
- header->offset = initialOffset + (off_t) 60;
- return(TRUE);
-}
-
-/*
- * get, check and correct the converted header
- */
-static int readArEntry(int srcFd, headerL_t *newEntry)
-{
- size_t nameLength;
-
- if(readRawArHeader(srcFd, newEntry)==FALSE)
- return(FALSE);
-
- nameLength = strcspn(newEntry->name, "/");
-
- /* handle GNU style short filenames, strip trailing '/' */
- if (nameLength > 0)
- newEntry->name[nameLength]='\0';
-
- /* handle GNU style long filenames */
- if (nameLength == 0) {
- /* escape from recursive call */
- if (newEntry->name[1]=='0')
- return(TRUE);
-
- /* the data section contains the real filename */
- if (newEntry->name[1]=='/') {
- char tempName[MAX_NAME_LENGTH];
-
- if (newEntry->size > MAX_NAME_LENGTH)
- newEntry->size = MAX_NAME_LENGTH;
- fullRead(srcFd, tempName, newEntry->size);
- tempName[newEntry->size-3]='\0';
-
- /* read the second header for this entry */
- /* be carefull, this is recursive */
- if (readArEntry(srcFd, newEntry)==FALSE)
- return(FALSE);
-
- if ((newEntry->name[0]='/') && (newEntry->name[1]='0'))
- strcpy(newEntry->name, tempName);
- else {
- errorMsg("Invalid long filename\n");
- return(FALSE);
- }
- }
- }
- return(TRUE);
-}
-
-/*
- * return the headerL_t struct for the specified filename
- */
-static headerL_t *getHeaders(int srcFd, headerL_t *head, int funct)
-{
- headerL_t *list;
- list = (headerL_t *) malloc(sizeof(headerL_t));
-
- if (checkArMagic(srcFd)==TRUE) {
- while(readArEntry(srcFd, list) == TRUE) {
- list->next = (headerL_t *) malloc(sizeof(headerL_t));
- *list->next = *head;
- *head = *list;
-
- /* recursive check for sub-archives */
- if ( funct & RECURSIVE )
- head = getHeaders(srcFd, head, funct);
- lseek(srcFd, head->offset + head->size, SEEK_SET);
- }
- }
- return(head);
-}
-
-/*
- * find an entry in the linked list matching the filename
- */
-static headerL_t *findEntry(headerL_t *head, const char *filename)
-{
- while(head->next != NULL) {
- if (strcmp(filename, head->name)==0)
- return(head);
- head=head->next;
- }
- return(NULL);
-}
-
-/*
- * populate linked list with all ar file entries and offset
- */
-static int displayEntry(headerL_t *head, int funct)
-{
- if ( funct & VERBOSE ) {
- printf("%s %d/%d %8d %s ", modeString(head->mode), head->uid, head->gid, head->size, timeString(head->mtime));
- }
- printf("%s\n", head->name);
- head = head->next;
- return(TRUE);
-}
-
-static int extractAr(int srcFd, int dstFd, headerL_t *file)
-{
- lseek(srcFd, file->offset, SEEK_SET);
- if (copySubFile(srcFd, dstFd, (size_t) file->size) == TRUE)
- return(TRUE);
- return(FALSE);
-}
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include "busybox.h"
extern int ar_main(int argc, char **argv)
{
- int funct = 0, opt=0;
- int srcFd=0, dstFd=0;
- headerL_t *header, *entry, *extractList;
-
- while ((opt = getopt(argc, argv, "ovtpxR")) != -1) {
+ FILE *src_stream = NULL;
+ char **extract_names = NULL;
+ char ar_magic[8];
+ int extract_function = extract_unconditional;
+ int opt;
+ int num_of_entries = 0;
+ extern off_t archive_offset;
+
+ while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
switch (opt) {
case 'o':
- funct |= PRESERVE_DATE;
+ extract_function |= extract_preserve_date;
break;
case 'v':
- funct |= VERBOSE;
+ extract_function |= extract_verbose_list;
break;
case 't':
- funct |= DISPLAY;
- break;
- case 'x':
- funct |= EXT_TO_FILE;
+ extract_function |= extract_list;
break;
case 'p':
- funct |= EXT_TO_STDOUT;
+ extract_function |= extract_to_stdout;
break;
- case 'R':
- funct |= RECURSIVE;
+ case 'x':
+ extract_function |= extract_all_to_fs;
break;
default:
- usage(ar_usage);
+ show_usage();
}
}
- /* check the src filename was specified */
+ /* check the src filename was specified */
if (optind == argc) {
- usage(ar_usage);
- return(FALSE);
- }
-
- if ( (srcFd = open(argv[optind], O_RDONLY)) < 0) {
- errorMsg("Cannot read %s\n", optarg);
- return (FALSE);
- }
- optind++;
- entry = (headerL_t *) malloc(sizeof(headerL_t));
- header = (headerL_t *) malloc(sizeof(headerL_t));
- extractList = (headerL_t *) malloc(sizeof(headerL_t));
+ show_usage();
+ }
+
+ src_stream = xfopen(argv[optind++], "r");
- header = getHeaders(srcFd, header, funct);
-
- /* find files to extract or display */
- if (optind<argc) {
- /* only handle specified files */
- while(optind < argc) {
- if ( (entry = findEntry(header, argv[optind])) != NULL) {
- entry->next = (headerL_t *) malloc(sizeof(headerL_t));
- *entry->next = *extractList;
- *extractList = *entry;
- }
- optind++;
- }
+ /* check ar magic */
+ fread(ar_magic, 1, 8, src_stream);
+ archive_offset = 8;
+ if (strncmp(ar_magic,"!<arch>",7) != 0) {
+ error_msg_and_die("invalid magic");
}
- else
- /* extract everything */
- extractList = header;
-
- while(extractList->next != NULL) {
- if ( funct & EXT_TO_FILE ) {
- dstFd = open(extractList->name, O_WRONLY | O_CREAT, extractList->mode);
-
- extractAr(srcFd, dstFd, extractList);
- }
- if ( funct & EXT_TO_STDOUT )
- extractAr(srcFd, fileno(stdout), extractList);
- if ( (funct & DISPLAY) || (funct & VERBOSE))
- displayEntry(extractList, funct);
- extractList=extractList->next;
+
+ /* Create a list of files to extract */
+ while (optind < argc) {
+ extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
+ extract_names[num_of_entries] = xstrdup(argv[optind]);
+ num_of_entries++;
+ extract_names[num_of_entries] = NULL;
+ optind++;
}
- return (TRUE);
+
+ unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names);
+ return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff