Issue extracting .tar file with iOS-libarchive library

Question

i am using iOS-libarchive library for .tar extraction on iphone. i am using the sample code given here at this link http://code.google.com/p/libarchive/wiki/Examples but i am facing problem in extracting .tar file. i am placing my .tar file in library/simulator.../Application/617C31E0/Documents folder.

when i run application for extraction then it completes it flow successfully without giving any error code. but i could not fine that extracted folder anywhere in machine.

here is the piece of code, i am using in my application

static int copy_data(struct archive *ar, struct archive *aw)
{
    int r;
    const void *buff;
    size_t size;
    off_t offset;

    for (;;) {
        r = archive_read_data_block(ar, &buff, &size, &offset);
        if (r == ARCHIVE_EOF)
            return (ARCHIVE_OK);
        if (r != ARCHIVE_OK)
            return (r);
        r = archive_write_data_block(aw, buff, size, offset);
        if (r != ARCHIVE_OK) {
            warn("archive_write_data_block()",
                 archive_error_string(aw));
            return (r);
        }
    }
}

static int verbose = 0;

static void extract(const char *filename, int do_extract, int flags)
{
    struct archive *a;
    struct archive *ext;
    struct archive_entry *entry;
    int r;

    a = archive_read_new();
    ext = archive_write_disk_new();
    archive_write_disk_set_options(ext, flags);
    /*
     * Note: archive_write_disk_set_standard_lookup() is useful
     * here, but it requires library routines that can add 500k or
     * more to a static executable.
     */

    archive_read_support_format_tar(a);
    /*
     * On my system, enabling other archive formats adds 20k-30k
     * each.  Enabling gzip decompression adds about 20k.
     * Enabling bzip2 is more expensive because the libbz2 library
     * isn't very well factored.
     */

    if (filename != NULL && strcmp(filename, "-") == 0)
        filename = NULL;
    if ((r = archive_read_open_file(a, filename, 10240)))
        fail("archive_read_open_file()",
             archive_error_string(a), r);
    for (;;) {
        r = archive_read_next_header(a, &entry);
        if (r == ARCHIVE_EOF)
            break;
        if (r != ARCHIVE_OK)
            fail("archive_read_next_header()",
                 archive_error_string(a), 1);
        if (verbose && do_extract)
            msg("x ");
        if (verbose || !do_extract)
            msg(archive_entry_pathname(entry));
        if (do_extract) {
            r = archive_write_header(ext, entry);
            if (r != ARCHIVE_OK)
                warn("archive_write_header()",
                     archive_error_string(ext));
            else {
                copy_data(a, ext);
                r = archive_write_finish_entry(ext);
                if (r != ARCHIVE_OK)
                    fail("archive_write_finish_entry()",
                         archive_error_string(ext), 1);
            }

        }
        if (verbose || !do_extract)
            msg("
");
    }
    archive_read_close(a);
    archive_read_finish(a);
    exit(0);
}

- (void)applicationDidFinishLaunching:(UIApplication *)application 
{
    // Override point for customization after application launch
    [window makeKeyAndVisible];

    // Extract files from archive into named dir in the temp dir

    NSString*   databaseName = @"PIIS147020451170078X.tar";
    NSArray*    documentPaths =       NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString*   documentsDir = [documentPaths objectAtIndex:0];
    NSString* make7zResPath = [documentsDir stringByAppendingPathComponent:databaseName];

    /*  
     NSString *tmpDirname = @"Extract7z";
     NSString *make7zFilename = @"PIIS147020451170078X";//@"test.7z";
     NSString *make7zResPath = [[NSBundle mainBundle] pathForResource:make7zFilename  ofType:@"tar"];
     */

    extract([make7zResPath cStringUsingEncoding:NSUTF8StringEncoding],1, ARCHIVE_EXTRACT_TIME);

    return;  
}

Please help me into this :(.

Thanks!!

Issue extracting .tar file with iOS-libarchive library

Answers (1)

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