73 lines
2.6 KiB
Ruby
73 lines
2.6 KiB
Ruby
#
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# Copyright (C) 2010 Wayne Meissner
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#
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# This file is part of ruby-ffi.
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * Neither the name of the Ruby FFI project nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.#
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module FFI
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# This class includes the {FFI::DataConverter} module.
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class StructByReference
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include DataConverter
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attr_reader :struct_class
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# @param [Struct] struct_class
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def initialize(struct_class)
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unless Class === struct_class and struct_class < FFI::Struct
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raise TypeError, 'wrong type (expected subclass of FFI::Struct)'
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end
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@struct_class = struct_class
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end
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# Always get {FFI::Type}::POINTER.
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def native_type
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FFI::Type::POINTER
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end
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# @param [nil, Struct] value
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# @param [nil] ctx
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# @return [AbstractMemory] Pointer on +value+.
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def to_native(value, ctx)
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return Pointer::NULL if value.nil?
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unless @struct_class === value
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raise TypeError, "wrong argument type #{value.class} (expected #{@struct_class})"
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end
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value.pointer
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end
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# @param [AbstractMemory] value
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# @param [nil] ctx
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# @return [Struct]
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# Create a struct from content of memory +value+.
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def from_native(value, ctx)
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@struct_class.new(value)
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end
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end
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end
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