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#
# Copyright (C) 2008, 2009 Wayne Meissner
# Copyright (C) 2008, 2009 Andrea Fazzi
# Copyright (C) 2008, 2009 Luc Heinrich
# Copyright (c) 2007, 2008 Evan Phoenix
#
# All rights reserved.
#
# 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 Evan Phoenix 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.
require 'ffi/platform'
require 'ffi/struct_layout_builder'
module FFI
class Struct
alias_method :align, :alignment
def self.size=(size)
raise ArgumentError, "Size already set" if defined?(@size) || defined?(@layout)
@size = size
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)
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
layout = builder.build
@size = layout.size
self.layout = layout unless self == Struct
layout
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 < FFI::Library || mod < FFI::Struct || mod.respond_to?(:find_type)) ? mod : nil
rescue Exception => ex
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.*/ && !(RUBY_PLATFORM =~ /java/)
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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