/usr/lib/ruby/vendor_ruby/ffi/struct.rb is in ruby-ffi 1.0.11debian-3.
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# Copyright (C) 2008-2010 Wayne Meissner
# Copyright (C) 2008, 2009 Andrea Fazzi
# Copyright (C) 2008, 2009 Luc Heinrich
#
# All rights reserved.
#
# 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 <http://www.gnu.org/licenses/>.
#
require 'ffi/platform'
require 'ffi/struct_layout_builder'
module FFI
class StructLayout
def offsets
members.map { |m| [ m, self[m].offset ] }
end
def offset_of(field_name)
self[field_name].offset
end
class Enum < Field
def get(ptr)
type.find(ptr.get_int(offset))
end
def put(ptr, value)
ptr.put_int(offset, type.find(value))
end
end
class InnerStruct < Field
def get(ptr)
type.struct_class.new(ptr.slice(self.offset, self.size))
end
# def put(ptr, value)
# raise TypeError, "wrong value type (expected #{type.struct_class}" unless value.is_a(type.struct_class)
# end
end
class Mapped < Field
def initialize(name, offset, type, orig_field)
super(name, offset, type)
@orig_field = orig_field
end
def get(ptr)
type.from_native(@orig_field.get(ptr), nil)
end
def put(ptr, value)
@orig_field.put(ptr, type.to_native(value, nil))
end
end
end
class Struct
def size
self.class.size
end
def alignment
self.class.alignment
end
alias_method :align, :alignment
def offset_of(name)
self.class.offset_of(name)
end
def members
self.class.members
end
def values
members.map { |m| self[m] }
end
def offsets
self.class.offsets
end
def clear
pointer.clear
self
end
def to_ptr
pointer
end
def self.size
defined?(@layout) ? @layout.size : defined?(@size) ? @size : 0
end
def self.size=(size)
raise ArgumentError, "Size already set" if defined?(@size) || defined?(@layout)
@size = size
end
def self.alignment
@layout.alignment
end
def self.members
@layout.members
end
def self.offsets
@layout.offsets
end
def self.offset_of(name)
@layout.offset_of(name)
end
def self.in
ptr(:in)
end
def self.out
ptr(:out)
end
def self.ptr(flags = :inout)
@ref_data_type ||= Type::Mapped.new(StructByReference.new(self))
end
def self.val
@val_data_type ||= StructByValue.new(self)
end
def self.by_value
self.val
end
def self.by_ref(flags = :inout)
self.ptr(flags)
end
class ManagedStructConverter < StructByReference
def initialize(struct_class)
super(struct_class)
raise NoMethodError, "release() not implemented for class #{struct_class}" unless struct_class.respond_to? :release
@method = struct_class.method(:release)
end
def from_native(ptr, ctx)
struct_class.new(AutoPointer.new(ptr, @method))
end
end
def self.auto_ptr
@managed_type ||= Type::Mapped.new(ManagedStructConverter.new(self))
end
class << self
public
def layout(*spec)
# raise RuntimeError, "struct layout already defined for #{self.inspect}" if defined?(@layout)
return @layout if spec.size == 0
builder = StructLayoutBuilder.new
builder.union = self < Union
builder.packed = @packed if defined?(@packed)
builder.alignment = @min_alignment if defined?(@min_alignment)
if spec[0].kind_of?(Hash)
hash_layout(builder, spec)
else
array_layout(builder, spec)
end
builder.size = @size if defined?(@size) && @size > builder.size
cspec = builder.build
@layout = cspec unless self == Struct
@size = cspec.size
return cspec
end
protected
def callback(params, ret)
mod = enclosing_module
FFI::CallbackInfo.new(find_type(ret, mod), params.map { |e| find_type(e, mod) })
end
def packed(packed = 1)
@packed = packed
end
alias :pack :packed
def aligned(alignment = 1)
@min_alignment = alignment
end
alias :align :aligned
def enclosing_module
begin
mod = self.name.split("::")[0..-2].inject(Object) { |obj, c| obj.const_get(c) }
mod.respond_to?(:find_type) ? mod : nil
rescue Exception
nil
end
end
def find_field_type(type, mod = enclosing_module)
if type.kind_of?(Class) && type < Struct
FFI::Type::Struct.new(type)
elsif type.kind_of?(Class) && type < FFI::StructLayout::Field
type
elsif type.kind_of?(::Array)
FFI::Type::Array.new(find_field_type(type[0]), type[1])
else
find_type(type, mod)
end
end
def find_type(type, mod = enclosing_module)
if mod
mod.find_type(type)
end || FFI.find_type(type)
end
private
def hash_layout(builder, spec)
raise "Ruby version not supported" if RUBY_VERSION =~ /1.8.*/
spec[0].each do |name, type|
builder.add name, find_field_type(type), nil
end
end
def array_layout(builder, spec)
i = 0
while i < spec.size
name, type = spec[i, 2]
i += 2
# If the next param is a Integer, it specifies the offset
if spec[i].kind_of?(Integer)
offset = spec[i]
i += 1
else
offset = nil
end
builder.add name, find_field_type(type), offset
end
end
end
end
end
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