OSSP::uuid (3) Linux Manual Page
OSSP::uuid – OSSP uuid Perl Binding
Description
OSSP uuid is a ISO-C:1999 application programming interface (API) and corresponding command line interface (CLI) for the generation of DCE 1.1, ISO/IEC 11578:1996 and RFC 4122 compliant Universally Unique Identifier (UUID). It supports DCE 1.1 variant UUIDs of version 1 (time and node based), version 3 (name based, MD5), version 4 (random number based) and version 5 (name based, SHA-1). Additional API bindings are provided for the languages ISO-C++:1998, Perl:5 and PHP:4/5. Optional backward compatibility exists for the ISO-C DCE-1.1 and Perl Data::UUID APIs. OSSP::uuid is the Perl binding to the OSSP uuid API. Three variants are provided:
TIE-STYLE API
The TIE-style API is a functionality-reduced wrapper around the OO-style API and intended for very high-level convenience programming:- "use OSSP::uuid;"
- tie" my $uuid, ‘OSSP::uuid::tie’, $mode, …;"
- "$uuid = [ $mode, … ];"
- "print "UUID=$uuid\n";"
- "untie $uuid;"
OO-STYLE API
The OO-style API is a wrapper around the C-style API and intended for high-level regular programming.- "use OSSP::uuid;"
- "my $uuid = "new" OSSP::uuid;"
- "$uuid->"load"($name);"
- "$uuid->"make"($mode, …);"
- "$result = $uuid->"isnil"();"
- "$result = $uuid->"compare"($uuid2);"
- "$uuid->"import"($fmt, $data_ptr);"
- "$data_ptr = $uuid->"export"($fmt);"
- "[(]$str[, $rc)] = $uuid->"error"();"
- "$ver = $uuid->"version"();"
- "undef $uuid;"
Additionally, the strings "v1", "v3", "v4", "v5" and "mc" can be used in $mode and the strings "bin", "str", and "txt" can be used for $fmt.
C-STYLE API
The C-style API is a direct mapping of the OSSP uuid ISO-C API to Perl and is intended for low-level programming. See uuid(3) for a description of the functions and their expected arguments.- "use OSSP::uuid qw(:all);"
- "my $uuid; $rc = "uuid_create"($uuid);"
- "$rc = "uuid_load"($uuid, $name);"
- "$rc = "uuid_make"($uuid, $mode, …);"
- "$rc = "uuid_isnil"($uuid, $result);"
- "$rc = "uuid_compare"($uuid, $uuid2, $result);"
- "$rc = "uuid_import"($uuid, $fmt, $data_ptr, $data_len);"
- "$rc = "uuid_export"($uuid, $fmt, $data_ptr, $data_len);"
- "$str = "uuid_error"($rc);"
- "$ver = "uuid_version"();"
- "$rc = "uuid_destroy"($uuid);"
Additionally, the following constants are exported for use in $rc, $mode, $fmt and $ver:
"UUID_VERSION", "UUID_LEN_BIN", "UUID_LEN_STR", "UUID_RC_OK", "UUID_RC_ARG", "UUID_RC_MEM", "UUID_RC_SYS", "UUID_RC_INT", "UUID_RC_IMP", "UUID_MAKE_V1", "UUID_MAKE_V3", "UUID_MAKE_V4", "UUID_MAKE_V5", "UUID_MAKE_MC", "UUID_FMT_BIN", "UUID_FMT_STR", "UUID_FMT_SIV", "UUID_FMT_TXT".
Examples
The following two examples create the version 3 UUID "02d9e6d5-9467-382e-8f9b-9300a64ac3cd", both via the OO-style and the C-style API. Error handling is omitted here for easier reading, but has to be added for production-quality code.
# TIE-style API (very high-level)
use OSSP::uuid;
tie my $uuid, ‘OSSP::uuid::tie’;
$uuid = [ "v1" ];
print "UUIDs: $uuid, $uuid, $uuid\n";
$uuid = [ "v3", "ns:URL", "http://www.ossp.org/" ];
print "UUIDs: $uuid, $uuid, $uuid\n";
untie $uuid;
# OO-style API (high-level)
use OSSP::uuid;
my $uuid = new OSSP::uuid;
my $uuid_ns = new OSSP::uuid;
$uuid_ns->load("ns:URL");
$uuid->make("v3", $uuid_ns, "http://www.ossp.org/");
undef $uuid_ns;
my $str = $uuid->export("str");
undef $uuid;
print "$str\n";
# C-style API (low-level)
use OSSP::uuid qw(:all);
my $uuid; uuid_create($uuid);
my $uuid_ns; uuid_create($uuid_ns);
uuid_load($uuid_ns, "ns:URL");
uuid_make($uuid, UUID_MAKE_V3, $uuid_ns, "http://www.ossp.org/");
uuid_destroy($uuid_ns);
my $str; uuid_export($uuid, UUID_FMT_STR, $str, undef);
uuid_destroy($uuid);
print "$str\n";