* 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 20 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 <string.h>
+#include <getopt.h>
+#include <unistd.h>
#include "busybox.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"
-
-//#define BB_AR_EXPERIMENTAL_UNTAR
-
-#if defined BB_AR_EXPERIMENTAL_UNTAR
-typedef struct rawTarHeader {
- char name[100]; /* 0-99 */
- char mode[8]; /* 100-107 */
- char uid[8]; /* 108-115 */
- char gid[8]; /* 116-123 */
- char size[12]; /* 124-135 */
- char mtime[12]; /* 136-147 */
- char chksum[8]; /* 148-155 */
- char typeflag; /* 156-156 */
- char linkname[100]; /* 157-256 */
- char magic[6]; /* 257-262 */
- char version[2]; /* 263-264 */
- char uname[32]; /* 265-296 */
- char gname[32]; /* 297-328 */
- char devmajor[8]; /* 329-336 */
- char devminor[8]; /* 337-344 */
- char prefix[155]; /* 345-499 */
- char padding[12]; /* 500-512 */
-} rawTarHeader_t;
-#endif
-
-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;
-
-#if defined BB_AR_EXPERIMENTAL_UNTAR
-/*
- * identify Tar header (magic field) and reset srcFd to entry position
- */
-static int checkTarMagic(int srcFd)
-{
- off_t headerStart;
- char magic[6];
-
- headerStart = lseek(srcFd, 0, SEEK_CUR);
- lseek(srcFd, (off_t) 257, SEEK_CUR);
- fullRead(srcFd, magic, 6);
- lseek(srcFd, headerStart, SEEK_SET);
- if (strncmp(magic, "ustar", 5)!=0)
- return(FALSE);
- return(TRUE);
-}
-
-
-static int readTarHeader(int srcFd, headerL_t *current)
-{
- rawTarHeader_t rawTarHeader;
- unsigned char *temp = (unsigned char *) &rawTarHeader;
- long sum = 0;
- int i;
- off_t initialOffset;
-
- initialOffset = lseek(srcFd, 0, SEEK_CUR);
- if (fullRead(srcFd, (char *) &rawTarHeader, 512) != 512) {
- lseek(srcFd, initialOffset, SEEK_SET);
- return(FALSE);
- }
- for (i = 0; i < 148 ; i++)
- sum += temp[i];
- sum += ' ' * 8;
- for (i = 156; i < 512 ; i++)
- sum += temp[i];
- if (sum!= strtol(rawTarHeader.chksum, NULL, 8))
- return(FALSE);
- sscanf(rawTarHeader.name, "%s", current->name);
- current->size = strtol(rawTarHeader.size, NULL, 8);
- current->uid = strtol(rawTarHeader.uid, NULL, 8);
- current->gid = strtol(rawTarHeader.gid, NULL, 8);
- current->mode = strtol(rawTarHeader.mode, NULL, 8);
- current->mtime = strtol(rawTarHeader.mtime, NULL, 8);
- current->offset = lseek(srcFd, 0 , SEEK_CUR);
-
- current->next = (headerL_t *) xmalloc(sizeof(headerL_t));
- current = current->next;
- return(TRUE);
-}
-#endif
-
-/*
- * identify Ar header (magic) and reset srcFd to entry position
- */
-static int checkArMagic(int srcFd)
-{
- off_t headerStart;
- char arMagic[8];
-
- headerStart = lseek(srcFd, 0, SEEK_CUR);
- if (fullRead(srcFd, arMagic, 8) != 8) {
- errorMsg("fatal error\n");
- return (FALSE);
- }
- lseek(srcFd, headerStart, SEEK_SET);
-
- if (strncmp(arMagic,"!<arch>",7) != 0)
- return(FALSE);
- return(TRUE);
-}
-
-/*
- * get, check and correct the converted header
- */
-static int readArEntry(int srcFd, headerL_t *entry)
-{
- size_t nameLength;
- rawArHeader_t rawArHeader;
- off_t initialOffset;
-
- 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(entry->name, rawArHeader.name, 16);
- nameLength=strcspn(entry->name, " \\");
- entry->name[nameLength]='\0';
- parse_mode(rawArHeader.mode, &entry->mode);
- entry->mtime = atoi(rawArHeader.date);
- entry->uid = atoi(rawArHeader.uid);
- entry->gid = atoi(rawArHeader.gid);
- entry->size = (size_t) atoi(rawArHeader.size);
- entry->offset = initialOffset + (off_t) 60;
-
- nameLength = strcspn(entry->name, "/");
-
- /* handle GNU style short filenames, strip trailing '/' */
- if (nameLength > 0)
- entry->name[nameLength]='\0';
-
- /* handle GNU style long filenames */
- if (nameLength == 0) {
- /* escape from recursive call */
- if (entry->name[1]=='0')
- return(TRUE);
-
- /* the data section contains the real filename */
- if (entry->name[1]=='/') {
- char tempName[MAX_NAME_LENGTH];
-
- if (entry->size > MAX_NAME_LENGTH)
- entry->size = MAX_NAME_LENGTH;
- fullRead(srcFd, tempName, entry->size);
- tempName[entry->size-3]='\0';
-
- /* read the second header for this entry */
- /* be carefull, this is recursive */
- if (readArEntry(srcFd, entry)==FALSE)
- return(FALSE);
-
- if ((entry->name[0]='/') && (entry->name[1]='0'))
- strcpy(entry->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)
-{
-#if defined BB_AR_EXPERIMENTAL_UNTAR
- int tar=FALSE;
-#endif
- int ar=FALSE;
- headerL_t *list;
- off_t initialOffset;
-
- list = (headerL_t *) xmalloc(sizeof(headerL_t));
- initialOffset=lseek(srcFd, 0, SEEK_CUR);
- if (checkArMagic(srcFd)==TRUE)
- ar=TRUE;
-
-#if defined BB_AR_EXPERIMENTAL_UNTAR
- if (checkTarMagic(srcFd)==TRUE)
- tar=TRUE;
-
- if (tar==TRUE) {
- while(readTarHeader(srcFd, list)==TRUE) {
- off_t tarOffset;
- list->next = (headerL_t *) xmalloc(sizeof(headerL_t));
- *list->next = *head;
- *head = *list;
-
- /* recursive check for sub-archives */
- if ((funct & RECURSIVE) == RECURSIVE)
- head = getHeaders(srcFd, head, funct);
- tarOffset = (off_t) head->size/512;
- if ( head->size % 512 > 0)
- tarOffset++;
- tarOffset=tarOffset*512;
- lseek(srcFd, head->offset + tarOffset, SEEK_SET);
- }
- }
-#endif
-
- if (ar==TRUE) {
- lseek(srcFd, 8, SEEK_CUR);
- while(1) {
- if (readArEntry(srcFd, list) == FALSE) {
- lseek(srcFd, ++initialOffset, SEEK_CUR);
- if (readArEntry(srcFd, list) == FALSE)
- return(head);
- }
- list->next = (headerL_t *) xmalloc(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);
-}
-
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 */
- if (optind == argc)
- usage(ar_usage);
-
- if ( (srcFd = open(argv[optind], O_RDONLY)) < 0)
- fatalError("Cannot read %s\n", argv[optind]);
+ if (optind == argc) {
+ show_usage();
+ }
- optind++;
- entry = (headerL_t *) xmalloc(sizeof(headerL_t));
- header = (headerL_t *) xmalloc(sizeof(headerL_t));
- extractList = (headerL_t *) xmalloc(sizeof(headerL_t));
+ 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 *) xmalloc(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
- extractList = header;
-
- while(extractList->next != NULL) {
- if (funct & EXT_TO_FILE) {
- if (isDirectory(extractList->name, TRUE, NULL)==FALSE)
- createPath(extractList->name, 0666);
- dstFd = open(extractList->name, O_WRONLY | O_CREAT, extractList->mode);
- lseek(srcFd, extractList->offset, SEEK_SET);
- copySubFile(srcFd, dstFd, (size_t) extractList->size);
- }
- if (funct & EXT_TO_STDOUT) {
- lseek(srcFd, extractList->offset, SEEK_SET);
- copySubFile(srcFd, fileno(stdout), (size_t) extractList->size);
- }
- if ( (funct & DISPLAY) || (funct & VERBOSE)) {
- if (funct & VERBOSE)
- printf("%s %d/%d %8d %s ", modeString(extractList->mode),
- extractList->uid, extractList->gid,
- extractList->size, timeString(extractList->mtime));
- printf("%s\n", extractList->name);
- }
- 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++;
}
+
+ unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names);
return EXIT_SUCCESS;
}
projects / oweals / busybox.git / blobdiff