NAME
FFI::Util - Some useful pointer utilities when writing FFI modules
VERSION
version 0.08
SYNOPSIS
use FFI::Util;DESCRIPTION
This module provides some useful memory manipulation that is either difficult or impossible in pure Perl. It was originally intended to be used by Archive::Libarchive::FFI, but it may be useful in other projects.
FUNCTIONS
locate_module_share_lib
my $path = locate_module_share_lib();
my $path = locate_module_share_lib($module_name, $module_filename);Returns the path to the shared library for the current module, or the module specified by $module_name (example: Foo::Bar) $module_filename(example /full/path/Foo/Bar.pm).
scalar_to_buffer
my($ptr, $size) = scalar_to_buffer $scalar;Given a scalar string value, return a pointer to where the data is stored and the size of the scalar in bytes.
buffer_to_scalar
my $scalar = buffer_to_scalar($ptr, $size);Given a pointer to a memory location and a size, construct a new scalar with the same content and size.
deref_ptr_get
my $ptr2 = deref_ptr_get($ptr1);equivalent to
void *ptr1;
void *ptr2;
*ptr2 = *ptr1;deref_ptr_set
deref_ptr_set($ptr1, $ptr2);equivalent to
void **ptr1;
void *ptr2;
*ptr1 = ptr2;deref_str_get
my $string = deref_str_get($ptr);equivalent to
const char *string;
const char **ptr;
string = *ptr;deref_str_set
deref_str_set($ptr, $string);equivalent to
const char **ptr;
const char *string;
*ptr = string;deref_int_get
my $integer = deref_int_get($ptr);equivalent to
int *ptr;
int integer;
integer = *ptr;deref_int_set
deref_int_set($ptr, $integer);equivalent to
int *ptr;
int integer;
*ptr = integer;deref_uint_get
my $unsigned_integer = deref_uint_get($ptr);equivalent to
unsigned int unsigned_integer;
unsigned int *ptr;
unsigned_integer = *ptr;deref_uint_set
deref_uint_set($ptr, $unsigned_integer);equivalent to
unsigned int *ptr;
unsigned int unsigned_integer;
*ptr = unsigned_integer;deref_short_get
my $short_integer = deref_short_get($ptr);equivalent to
short short_integer;
short *ptr;
short_integer = *ptr;deref_short_set
deref_short_set($ptr, $short_integer);equivalent to
short *ptr;
short short_integer;
*ptr = short_integer;deref_ushort_get
my $unsigned_short_integer = deref_ushort_get($ptr);equivalent to
unsigned short unsigned_short_integer;
unsigned short *ptr;
unsigned unsigned_short_integer = *ptr;deref_ushort_set
deref_ushort_set($ptr, $unsigned_short_integer);equivalent to
unsigned short *ptr;
unsigned short unsigned_short_integer;
*ptr = unsigned_short_integer;deref_long_get
my $long_integer = deref_long_get($ptr);equivalent to
long long_integer;
long *ptr;
long_integer = *ptr;deref_long_set
deref_long_set($ptr, $long_integer);equivalent to
long *ptr;
long long_integer;
*ptr = long_integer;deref_ulong_get
my $unsigned_long_integer = deref_ulong_get($ptr);equivalent to
unsigned long unsigned_long_integer;
unsigned long *ptr;
unsigned unsigned_long_integer = *ptr;deref_ulong_set
deref_ulong_set($ptr, $unsigned_long_integer);equivalent to
unsigned long *ptr;
unsigned long unsigned_long_integer;
*ptr = unsigned_long_integer;deref_char_get
my $char_integer = deref_char_get($ptr);equivalent to
char char_integer;
char *ptr;
char_integer = *ptr;deref_char_set
deref_char_set($ptr, $char_integer);equivalent to
char *ptr;
char char_integer;
*ptr = char_integer;deref_uchar_get
my $unsigned_char_integer = deref_uchar_get($ptr);equivalent to
unsigned char unsigned char_integer;
unsigned char *ptr;
unsigned_char_integer = *ptr;deref_uchar_set
deref_uchar_set($ptr, $unsigned_char_integer);equivalent to
unsigned char *ptr;
unsigned char unsigned_char_integer;
*ptr = unsigned_char_integer;deref_float_get
my $single_float = deref_float_get($ptr);equivalent to
float single_float;
float *ptr;
single_float = *ptr;deref_float_set
deref_float_set($ptr, $single_float);equivalent to
float *ptr;
float single_float;
*ptr = single_float;deref_double_get
my $double_float = deref_double_get($ptr);equivalent to
double double_float;
double *ptr;
double_float = *ptr;deref_double_set
deref_double_set($ptr, $double_float);equivalent to
double *ptr;
double double_float;
*ptr = double_float;deref_int64_get
my $int64 = deref_int64_get($ptr);equivalent to
int64_t int64;
int64_t *ptr;
int64 = *ptr;deref_int64_set
deref_int64_set($ptr, $int64);equivalent to
int64_t *ptr;
int64_t int64;
*ptr = int64;deref_uint64_get
my $uint64 = deref_uint64_get($ptr);equivalent to
uint64_t uint64;
uint64_t *ptr;
uint64 = *ptr;deref_uint64_set
deref_uint64_set($ptr, $uint64);equivalent to
uint64_t *ptr;
uint64_t uint64;
*ptr = uint64;deref_dev_t_get
Alias for appropriate derf_..._get if dev_t is provided by your compiler.
deref_dev_t_set
Alias for appropriate derf_..._set if dev_t is provided by your compiler.
deref_gid_t_get
Alias for appropriate derf_..._get if gid_t is provided by your compiler.
deref_gid_t_set
Alias for appropriate derf_..._set if gid_t is provided by your compiler.
deref_size_t_get
Alias for appropriate derf_..._get if size_t is provided by your compiler.
deref_size_t_set
Alias for appropriate derf_..._set if size_t is provided by your compiler.
deref_time_t_get
Alias for appropriate derf_..._get if time_t is provided by your compiler.
deref_time_t_set
Alias for appropriate derf_..._set if time_t is provided by your compiler.
deref_uid_t_get
Alias for appropriate derf_..._get if uid_t is provided by your compiler.
deref_uid_t_set
Alias for appropriate derf_..._set if uid_t is provided by your compiler.
SEE ALSO
AUTHOR
Graham Ollis <plicease@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2013 by Graham Ollis.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.