97 lines
3.2 KiB
Ruby
97 lines
3.2 KiB
Ruby
#
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# Copyright (C) 2008-2010 Wayne Meissner
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# Copyright (C) 2008, 2009 Andrea Fazzi
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# Copyright (C) 2008, 2009 Luc Heinrich
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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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#
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module FFI
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class StructLayout
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# @return [Array<Array(Symbol, Numeric)>
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# Get an array of tuples (field name, offset of the field).
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def offsets
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members.map { |m| [ m, self[m].offset ] }
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end
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# @return [Numeric]
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# Get the offset of a field.
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def offset_of(field_name)
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self[field_name].offset
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end
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# An enum {Field} in a {StructLayout}.
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class Enum < Field
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# @param [AbstractMemory] ptr pointer on a {Struct}
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# @return [Object]
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# Get an object of type {#type} from memory pointed by +ptr+.
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def get(ptr)
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type.find(ptr.get_int(offset))
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end
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# @param [AbstractMemory] ptr pointer on a {Struct}
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# @param value
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# @return [nil]
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# Set +value+ into memory pointed by +ptr+.
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def put(ptr, value)
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ptr.put_int(offset, type.find(value))
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end
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end
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class InnerStruct < Field
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def get(ptr)
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type.struct_class.new(ptr.slice(self.offset, self.size))
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end
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def put(ptr, value)
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raise TypeError, "wrong value type (expected #{type.struct_class})" unless value.is_a?(type.struct_class)
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ptr.slice(self.offset, self.size).__copy_from__(value.pointer, self.size)
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end
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end
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class Mapped < Field
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def initialize(name, offset, type, orig_field)
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super(name, offset, type)
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@orig_field = orig_field
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end
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def get(ptr)
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type.from_native(@orig_field.get(ptr), nil)
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end
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def put(ptr, value)
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@orig_field.put(ptr, type.to_native(value, nil))
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end
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end
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end
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end
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