module FFI

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

This code is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License version 3 for more details.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

see {file:README}

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This file is part of ruby-ffi.

This code is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 3 only, as published by the Free Software Foundation.

You should have received a copy of the GNU Lesser General Public License version 3 along with this work. If not, see <www.gnu.org/licenses/>.

This module embbed type constants from {FFI::NativeType}.

Constants

CURRENT_PROCESS
VERSION

Public Class Methods

add_typedef(old, add) click to toggle source

(see ::typedef)

# File lib/ffi/types.rb, line 32
def self.add_typedef(old, add)
  typedef old, add
end

errno() click to toggle source

@return (see FFI::LastError.error) @see FFI::LastError.error

# File lib/ffi/errno.rb, line 24
def self.errno
  FFI::LastError.error
end

errno=(error) click to toggle source

@param error (see FFI::LastError.error=) @return (see FFI::LastError.error=) @see FFI::LastError.error=

# File lib/ffi/errno.rb, line 30
def self.errno=(error)
  FFI::LastError.error = error
end

find_type(name, type_map = nil) click to toggle source

@param [Type, DataConverter, Symbol] name @param [Hash] type_map if nil, {FFI::TypeDefs} is used @return [Type] Find a type in type_map ({FFI::TypeDefs}, by default) from a type objet, a type name (symbol). If name is a {DataConverter}, a new {Type::Mapped} is created.

# File lib/ffi/types.rb, line 43
def self.find_type(name, type_map = nil)
  if name.is_a?(Type)
    name

  elsif type_map && type_map.has_key?(name)
    type_map[name]

  elsif TypeDefs.has_key?(name)
    TypeDefs[name]

  elsif name.is_a?(DataConverter)
    (type_map || TypeDefs)[name] = Type::Mapped.new(name)
  
  else
    raise TypeError, "unable to resolve type '#{name}'"
  end
end

map_library_name(lib) click to toggle source

@param [to_s] lib library name @return [String] library name formatted for current platform Transform a generic library name to a platform library name @example

# Linux
FFI.map_library_name 'c'     # -> "libc.so.6"
FFI.map_library_name 'jpeg'  # -> "libjpeg.so"
# Windows
FFI.map_library_name 'c'     # -> "msvcrt.dll"
FFI.map_library_name 'jpeg'  # -> "jpeg.dll"

# File lib/ffi/library.rb, line 34
def self.map_library_name(lib)
  # Mangle the library name to reflect the native library naming conventions
  lib = lib.to_s unless lib.kind_of?(String)
  lib = Library::LIBC if lib == 'c'

  if lib && File.basename(lib) == lib
    lib = Platform::LIBPREFIX + lib unless lib =~ %r^#{Platform::LIBPREFIX}/
    r = Platform::IS_GNU ? "\\.so($|\\.[1234567890]+)" : "\\.#{Platform::LIBSUFFIX}$"
    lib += ".#{Platform::LIBSUFFIX}" unless lib =~ %r#{r}/
  end

  lib
end

type_size(type) click to toggle source

@param type type is an instance of class accepted by {::find_type} @return [Numeric] Get type size, in bytes.

# File lib/ffi/types.rb, line 159
def self.type_size(type)
  find_type(type).size
end

typedef(old, add) click to toggle source

@param [Type, DataConverter, Symbol] old type definition used by {::find_type} @param [Symbol] add new type definition’s name to add @return [Type] Add a definition type to type definitions.

# File lib/ffi/types.rb, line 27
def self.typedef(old, add)
  TypeDefs[add] = self.find_type(old)
end