ZIP_FILE_GET_EXTERNAL_ATTRIBUTES(3)

NAME
zip_file_get_external_attributes - get external attributes for file in zip

LIBRARY
libzip (-lzip)

SYNOPSIS
zip.h const char * 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 <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)

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