zip_file_get_external_attributes man page

zip_file_get_external_attributes ā€” get external attributes for file in zip

Library

libzip (-lzip)

Synopsis

#include <zip.h>

int
zip_file_get_external_attributes(zip_t *archive, zip_uint64_t index, zip_flags_t flags, zip_uint8_t *opsys, zip_uint32_t *attributes);

Description

The zip_file_get_external_attributes() function returns the operating system and external attributes for the file at position index in the zip archive. The external attributes usually contain the operating system-specific file permissions. If flags is set to ZIP_FL_UNCHANGED, the original unchanged values are returned. If opsys or attributes are NULL, they are not filled in.

The following operating systems are defined by the zip specification:

The defines above follow the PKWARE Inc. Appnote; please note that the InfoZIP Appnote has a slightly different mapping.

Return Values

Upon successful completion, 0 is returned. In case of an error, -1 is returned and the error code in archive is set to indicate the error.

Examples

The following code can be used to expand attributes if the operating system is ZIP_OPSYS_DOS.

#include <sys/stat.h> 
 
#define FA_RDONLY       0x01            // FILE_ATTRIBUTE_READONLY 
#define FA_DIREC        0x10            // FILE_ATTRIBUTE_DIRECTORY 
 
static mode_t 
_zip_dos_attr2mode(zip_uint32_t attr) 
{ 
   mode_t m = S_IRUSR | S_IRGRP | S_IROTH; 
   if (0 == (attr & FA_RDONLY)) 
      m |= S_IWUSR | S_IWGRP | S_IWOTH; 
 
   if (attr & FA_DIREC) 
      m = (S_IFDIR | (m & ~S_IFMT)) | S_IXUSR | S_IXGRP | S_IXOTH; 
 
   return m; 
}

Errors

zip_file_get_external_attributes() fails if:

[ZIP_ER_INVAL]

index is not a valid file index in archive.

See Also

libzip(3), zip_file_set_external_attributes(3)

History

zip_file_get_external_attributes() was added in libzip 0.11.2.

Authors

Dieter Baron <dillo@nih.at> and Thomas Klausner <tk@giga.or.at>

Referenced By

libzip(3), zip_file_set_external_attributes(3).

December 18, 2017