ZIP_FILE_GET_EXTERNAL_ATTRIBUTES

Section: Library Functions Manual (3)
Updated: September 19, 2013
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NAME

zip_file_get_external_attributes - get external attributes for file in zip

LIBRARY

libzip (-lzip)

SYNOPSIS

#include <zip.h>

const char *
zip_file_get_external_attributes(struct zip *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.

ERRORS

zip_file_get_external_attributes() fails if:

[ZIP_ER_INVAL]: index is not a valid file index in archive.

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;
}

AUTHORS

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