zip_file_get_external_attributes(3)

Name

zip_file_get_external_attributes — 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:

ZIP_OPSYS_ACORN_RISC
ZIP_OPSYS_ALTERNATE_MVS
ZIP_OPSYS_AMIGA
ZIP_OPSYS_ATARI_ST
ZIP_OPSYS_BEOS
ZIP_OPSYS_CPM
ZIP_OPSYS_DOS
ZIP_OPSYS_MACINTOSH
ZIP_OPSYS_MVS
ZIP_OPSYS_OPENVMS
ZIP_OPSYS_OS_2
ZIP_OPSYS_OS_400
ZIP_OPSYS_OS_X
ZIP_OPSYS_TANDEM
ZIP_OPSYS_UNIX
ZIP_OPSYS_VFAT
ZIP_OPSYS_VM_CMS
ZIP_OPSYS_VSE
ZIP_OPSYS_WINDOWS_NTFS (uncommon, use ZIP_OPSYS_DOS instead)
ZIP_OPSYS_Z_SYSTEM

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 

#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.

History

zip_file_get_external_attributes() was added in libzip 0.11.2.

Authors

Dieter Baron <dillo@nih.at> and Thomas Klausner <wiz@gatalith.at>