使用iOS-libarchive库解压缩.tar文件

Question

我在iOS上使用iOS-libarchive库解压.tar文件。我正在使用此处链接的示例代码 http://code.google.com/p/libarchive/wiki/Examples 但我在解压缩.tar文件时遇到问题。 我将我的.tar文件放在库/模拟器.../Application/617C31E0/Documents文件夹中。

当我运行应用程序提取然后它完成它成功流程没有提供任何错误代码。但我无法罚机器中任何地方提取文件夹。

这里是一段代码，我用我的应用程序

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("\n"); 
    } 
    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; 
} 

请帮我到这个:(。

谢谢！

Answer 1

我写的做的正是另一个库你想要什么：https://github.com/mhausherr/Light-Untar-for-iOS

简而言之，我只实现了最小的功能来解压文件 完整解释在这里http://blog.octo.com/en/untar-on-ios-the-pragmatic-way/