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module FFI
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.align
@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
:buffer_in
end
def self.out
:buffer_out
end
def self.by_value
::FFI::StructByValue.new(self)
end
class << self
public
def layout(*spec)
return @layout if spec.size == 0
builder = FFI::StructLayoutBuilder.new
builder.union = self < Union
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 == FFI::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 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 => ex
nil
end
end
def find_type(type, mod = nil)
if type.kind_of?(Class) && type < FFI::Struct
FFI::Type::Struct.new(type)
elsif type.is_a?(::Array)
type
elsif 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/)
mod = enclosing_module
spec[0].each do |name,type|
if type.kind_of?(Class) && type < Struct
builder.add_struct(name, type)
elsif type.kind_of?(::Array)
builder.add_array(name, find_type(type[0], mod), type[1])
else
builder.add_field(name, find_type(type, mod))
end
end
end
def array_layout(builder, spec)
mod = enclosing_module
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
if type.kind_of?(Class) && type < Struct
builder.add_struct(name, type, offset)
elsif type.kind_of?(::Array)
builder.add_array(name, find_type(type[0], mod), type[1], offset)
else
builder.add_field(name, find_type(type, mod), offset)
end
end
end
#
# FIXME This is here for backwards compat with rbx. No idea if it
# even works anymore, but left here for now.
#
protected
def config(base, *fields)
config = FFI::Config::CONFIG
builder = FFI::StructLayoutBuilder.new
fields.each do |field|
offset = config["#{base}.#{field}.offset"]
size = config["#{base}.#{field}.size"]
type = config["#{base}.#{field}.type"]
type = type ? type.to_sym : FFI.size_to_type(size)
code = FFI.find_type type
if (code == NativeType::CHAR_ARRAY)
builder.add_char_array(field.to_s, size, offset)
else
builder.add_field(field.to_s, code, offset)
end
end
size = config["#{base}.sizeof"]
builder.size = size if size > builder.size
cspec = builder.build
@layout = cspec
@size = cspec.size
return cspec
end
end
end
class Union < Struct
# Nothing to do here
end
end
|
