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-rw-r--r--ar.c384
1 files changed, 140 insertions, 244 deletions
diff --git a/ar.c b/ar.c
index b1200b8..1c598fa 100644
--- a/ar.c
+++ b/ar.c
@@ -4,6 +4,12 @@
*
* 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.
*
@@ -21,10 +27,8 @@
* 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 10 June 2000
+ * Last modified 25 August 2000
*/
-
-
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
@@ -34,287 +38,179 @@
#include <sys/types.h>
#include "internal.h"
-#define AR_BLOCK_SIZE 60
-#define AR_PRESERVE_DATE 1 /* preserve original dates */
-#define AR_VERBOSE 2 /* be verbose */
-#define AR_DISPLAY 4 /* display contents */
-#define AR_EXT_TO_FILE 8 /* extract contents of archive */
-#define AR_EXT_TO_STDOUT 16 /* extract to stdout */
+#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"
-struct ArHeader { /* Byte Offset */
- char ar_name[16]; /* 0-15 */
- char ar_date[12]; /* 16-27 */
- char ar_uid[6], ar_gid[6]; /* 28-39 */
- char ar_mode[8]; /* 40-47 */
- char ar_size[10]; /* 48-57 */
- char ar_fmag[2]; /* 58-59 */
-};
-typedef struct ArHeader ArHeader;
-
-struct ArInfo {
- char name[17]; /* File name */
- time_t date; /* long int, No of seconds since epoch */
- uid_t uid; /* unsigned int, Numeric UID */
- gid_t gid; /* unsigned int, Numeric GID */
- mode_t mode; /* unsigned int, Unix mode */
- size_t size; /* int, Size of the file */
-};
-typedef struct ArInfo ArInfo;
+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;
/*
- * Display details of a file, verbosly if funct=2
+ * populate linked list with all ar file entries and offset
*/
-static void displayEntry(struct ArInfo *entry, int funct)
+static int parseArArchive(int srcFd, headerL_t *current)
{
- /* TODO convert mode to string */
- if ((funct & AR_VERBOSE) == AR_VERBOSE)
- printf("%i %i/%i %8i %s ", entry->mode, entry->uid, entry->gid,
- entry->size, timeString(entry->date));
- printf("%s\n", entry->name);
-}
-
-/* this is from tar.c remove later*/
-static long getOctal(const char *cp, int size)
-{
- long val = 0;
-
- for(;(size > 0) && (*cp == ' '); cp++, size--);
- if ((size == 0) || !isOctal(*cp))
- return -1;
- for(; (size > 0) && isOctal(*cp); size--) {
- val = val * 8 + *cp++ - '0';
+ 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);
}
- for (;(size > 0) && (*cp == ' '); cp++, size--);
- if ((size > 0) && *cp)
- return -1;
- return val;
-}
-
-/*
- * Converts from the char based struct to a new struct with stricter types
- */
-static int processArHeader(struct ArHeader *rawHeader, struct ArInfo *header)
-{
- int count2;
- int count;
-
- /* check end of header marker is valid */
- if ((rawHeader->ar_fmag[0]!='`') || (rawHeader->ar_fmag[1]!='\n'))
- return(FALSE);
-
- /* convert filename */
- for (count = 0; count < 16; count++) {
- /* allow spaces in filename except at the end */
- if (rawHeader->ar_name[count] == ' ') {
- for (count2 = count; count2 < 16; count2++)
- if (!isspace(rawHeader->ar_name[count2]))
- break;
- if (count2 >= 16)
- break;
- }
- /* GNU ar uses '/' as an end of filename marker */
- if (rawHeader->ar_name[count] == '/')
- break;
- header->name[count] = rawHeader->ar_name[count];
- }
- header->name[count] = '\0';
- header->date = atoi(rawHeader->ar_date);
- header->uid = atoi(rawHeader->ar_uid);
- header->gid = atoi(rawHeader->ar_gid);
- header->mode = getOctal(rawHeader->ar_mode, sizeof(rawHeader->ar_mode));
- header->size = atoi(rawHeader->ar_size);
- return (TRUE);
-}
-
-/*
- * Copy size bytes from current position if srcFd to current position in dstFd
- * taken from tarExtractRegularFile in tar.c, remove later
- */
-static int copySubFile(int srcFd, int dstFd, int copySize)
-{
- int readSize, writeSize, doneSize;
- char buffer[BUFSIZ];
-
- while (copySize > 0) {
- if (copySize > BUFSIZ)
- readSize = BUFSIZ;
- else
- readSize = copySize;
- writeSize = fullRead(srcFd, buffer, readSize);
- if (writeSize <= 0) {
- errorMsg(io_error, "copySubFile", strerror(errno));
- return (FALSE);
- }
- doneSize = fullWrite(dstFd, buffer, writeSize);
- if (doneSize <= 0) {
- errorMsg(io_error, "copySubFile", strerror(errno));
- return (FALSE);
- }
- copySize -= doneSize;
- }
- return (TRUE);
+ 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, &current->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);
}
/*
- * Extract the file described in ArInfo to the specified path
- * set the new files uid, gid and mode
+ * return the headerL_t struct for the specified filename
*/
-static int extractToFile(struct ArInfo *file, int funct, int srcFd, const char *path)
+static headerL_t *getSubFileHeader(int srcFd, const char filename[16])
{
- int dstFd, temp;
- struct stat tmpStat;
- char *pathname = NULL;
- struct utimbuf newtime;
-
- if ((temp = isDirectory(path, TRUE, &tmpStat)) != TRUE) {
- if (!createPath(path, 0777)) {
- fatalError("Cannot extract to specified path");
- return (FALSE);
- }
- }
- temp = (strlen(path) + 16);
- pathname = (char *) xmalloc(temp);
- pathname = strcpy(pathname, path);
- pathname = strcat(pathname, file->name);
- dstFd = device_open(pathname, O_WRONLY | O_CREAT);
- temp = copySubFile(srcFd, dstFd, file->size);
- fchown(dstFd, file->uid, file->gid);
- fchmod(dstFd, file->mode);
- close(dstFd);
- if ((funct&AR_PRESERVE_DATE)==AR_PRESERVE_DATE)
- newtime.modtime=file->date;
- else
- newtime.modtime=time(0);
- newtime.actime=time(0);
- temp = utime(pathname, &newtime);
- return (TRUE);
+ 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);
}
/*
- * Return a file descriptor for the specified file and do error checks
+ * populate linked list with all ar file entries and offset
*/
-static int getArFd(char *filename)
+static int displayEntry(int srcFd, const char filename[16], int funct)
{
- int arFd;
- char arVersion[8];
+ headerL_t *file;
- arFd = open(filename, O_RDONLY);
- if (arFd < 0) {
- errorMsg("Error opening '%s': %s\n", filename, strerror(errno));
- return (FALSE);
+ 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));
}
- if (fullRead(arFd, arVersion, 8) <= 0) {
- errorMsg( "Unexpected EOF in archive\n");
- return (FALSE);
- }
- if (strncmp(arVersion,"!<arch>",7) != 0) {
- errorMsg("ar header fails check ");
- return(FALSE);
- }
- return arFd;
+ printf("%s\n", file->name);
+ return(TRUE);
}
-/*
- * Step through the ar file and process it one entry at a time
- * fileList[0] is the name of the ar archive
- * fileList[1] and up are filenames to extract from the archive
- * funct contains flags to specify the actions to be performed
- */
-static int readArFile(char *fileList[16], int fileListSize, int funct)
+static int extractAr(int srcFd, int dstFd, const char filename[16])
{
- int arFd, status, extFileFlag, i, lastOffset=0;
- ArHeader rawArHeader;
- ArInfo arEntry;
-
- /* open the ar archive */
- arFd=getArFd(fileList[0]);
-
- /* read the first header, then loop until ono more headers */
- while ((status = fullRead(arFd, (char *) &rawArHeader, AR_BLOCK_SIZE))
- == AR_BLOCK_SIZE) {
-
- /* check the header is valid, if not try reading the header
- agian with an offset of 1, needed as some ar archive end
- with a '\n' which isnt counted in specified file size */
- if ((status=processArHeader(&rawArHeader, &arEntry))==FALSE ) {
- if ((i=lseek(arFd, 0, SEEK_CUR))==(lastOffset+60))
- lseek(arFd, lastOffset+1, SEEK_SET);
- else
- return(FALSE);
- }
- else {
- extFileFlag=0;
-
- if ((funct&AR_DISPLAY) || (funct&AR_VERBOSE))
- displayEntry(&arEntry, funct);
-
- /* check file was specified to be extracted only if
- some file were specified */
- if ((funct&AR_EXT_TO_FILE) || (funct&AR_EXT_TO_STDOUT)){
- if (fileListSize==1)
- extFileFlag=1;
- else {
- for( i=1; i<=fileListSize; i++)
- if ((status=(strcmp(fileList[i],arEntry.name)))==0)
- extFileFlag=1;
- }
- }
- if (extFileFlag==1) {
- if (funct&AR_EXT_TO_FILE)
- extractToFile(&arEntry, funct, arFd, "./");
- else
- copySubFile(arFd,fileno(stdout),arEntry.size);
- }
- else
- lseek(arFd, arEntry.size, SEEK_CUR);
- lastOffset=lseek(arFd, 0, SEEK_CUR);
- } /* if processArHeader */
- } /* while */
- return (TRUE);
+ 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, ret=0, i=0;
- char *fileList[16], c, *opt_ptr;
-
- if (argc < 2)
- usage(ar_usage);
-
- opt_ptr = argv[1];
- if (*opt_ptr == '-')
- ++opt_ptr;
- while ((c = *opt_ptr++) != '\0') {
- switch (c) {
+ 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 | AR_PRESERVE_DATE;
+ funct = funct | PRESERVE_DATE;
break;
case 'v':
- funct = funct | AR_VERBOSE;
+ funct = funct | VERBOSE;
break;
case 't':
- funct = funct | AR_DISPLAY;
- break;
+ funct = funct | DISPLAY;
case 'x':
- funct = funct | AR_EXT_TO_FILE;
- break;
+ if (opt=='x') {
+ funct = funct | EXT_TO_FILE;
+ }
case 'p':
- funct = funct | AR_EXT_TO_STDOUT;
+ 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);
}
}
-
- for(i=0; i<(argc-2); i++)
- fileList[i]=argv[i+2];
-
- if (funct > 3)
- ret = readArFile(fileList, (argc-2), funct);
+
+ /* check options not just preserve_dates and/or verbose */
+ if (funct < 4) {
+ usage(ar_usage);
+ return(FALSE);
+ }
- return (ret);
+ /* 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);
}
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