class GirFFI::InPointer

The InPointer class handles conversion from ruby types to pointers for arguments with direction :in. This is used for arguments that are arrays, strings, or interfaces.

Public Class Methods

from(type, val) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 32
def self.from(type, val)
  return unless val
  case type
  when :utf8, :filename
    from_utf8 val
  when :gint32, :guint32, :gint8
    new val
  when Class, :void
    val.to_ptr
  when Module
    new type[val]
  else
    raise NotImplementedError, type
  end
end
from_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 6
def self.from_array(type, ary)
  return unless ary
  case type
  when :utf8, :filename
    from_utf8_array ary
  when :gboolean
    from_boolean_array ary
  when Symbol
    from_basic_type_array type, ary
  when Class
    if type == GObject::Value
      from_gvalue_array type, ary
    else
      from_struct_array type, ary
    end
  when Module
    from_enum_array type, ary
  when Array
    main_type, sub_type = *type
    raise "Unexpected main type #{main_type}" if main_type != :pointer
    from_pointer_array sub_type, ary
  else
    raise NotImplementedError, type
  end
end
from_closure_data(obj) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 49
def from_closure_data(obj)
  FFI::Pointer.new(obj.object_id).tap do |ptr|
    ArgHelper::OBJECT_STORE.store(ptr, obj)
  end
end

Private Class Methods

from_basic_type_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 103
def from_basic_type_array(type, ary)
  ffi_type = TypeMap.type_specification_to_ffi_type type
  ary = ary.dup << null_value(ffi_type)
  type_size = FFI.type_size(ffi_type)
  block = AllocationHelper.safe_malloc type_size * ary.length
  block.send "put_array_of_#{ffi_type}", 0, ary
  new block
end
from_boolean_array(ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 61
def from_boolean_array(ary)
  from_basic_type_array :int, ary.map { |val| val ? 1 : 0 }
end
from_enum_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 93
def from_enum_array(type, ary)
  from_basic_type_array :int32, ary.map { |sym| type.to_native sym, nil }
end
from_gvalue_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 69
def from_gvalue_array(type, ary)
  ary = ary.map do |it|
    if it.is_a? GObject::Value
      it
    else
      GObject::Value.wrap_ruby_value it
    end
  end
  from_struct_array type, ary
end
from_pointer_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 65
def from_pointer_array(type, ary)
  from_basic_type_array :pointer, ary.map { |elem| from type, elem }
end
from_struct_array(type, ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 80
def from_struct_array(type, ary)
  ffi_type = TypeMap.type_specification_to_ffi_type type
  type_size = FFI.type_size(ffi_type)
  length = ary.length

  ptr = AllocationHelper.safe_malloc type_size * (length + 1)
  ary.each_with_index do |item, idx|
    type.copy_value_to_pointer item, ptr, idx * type_size
  end
  ptr.put_bytes length * type_size, "\0" * type_size, 0, type_size
  new ptr
end
from_utf8(str) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 97
def from_utf8(str)
  len = str.bytesize
  ptr = AllocationHelper.safe_malloc(len + 1).write_string(str).put_char(len, 0)
  new ptr
end
from_utf8_array(ary) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 57
def from_utf8_array(ary)
  from_basic_type_array :pointer, ary.map { |str| from_utf8 str }
end
null_value(ffi_type) click to toggle source
# File lib/gir_ffi/in_pointer.rb, line 112
def null_value(ffi_type)
  ffi_type == :pointer ? nil : 0
end