FFI

see {file:README}

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.#

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

This file is part of ruby-ffi.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of the Ruby FFI project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

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

Public Class Methods

add_typedef(old, add) click to toggle source

(see FFI.typedef)

# File lib/ffi/types.rb, line 45
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 34
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 40
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 56
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 44
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 =~ /^#{Platform::LIBPREFIX}/
    r = Platform::IS_GNU ? "\\.so($|\\.[1234567890]+)" : "\\.#{Platform::LIBSUFFIX}$"
    lib += ".#{Platform::LIBSUFFIX}" unless lib =~ /#{r}/
  end

  lib
end

type_size(type) click to toggle source

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

# File lib/ffi/types.rb, line 172
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 {FFI.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 40
def self.typedef(old, add)
  TypeDefs[add] = self.find_type(old)
end

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