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/*
* Copyright (c) 2010, Wayne Meissner
* 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.
* * The name of the author or authors may not 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.
*/
#ifndef _MSC_VER
# include <sys/param.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#ifndef _MSC_VER
# include <stdint.h>
# include <stdbool.h>
#else
# include "win32/stdbool.h"
# include "win32/stdint.h"
#endif
#include <errno.h>
#include <ruby.h>
#include <ffi.h>
#include "rbffi.h"
#include "compat.h"
#include "Pointer.h"
#include "Struct.h"
#include "StructByReference.h"
#define FFI_ALIGN(v, a) (((((size_t) (v))-1) | ((a)-1))+1)
static VALUE sbr_allocate(VALUE);
static VALUE sbr_initialize(VALUE, VALUE);
static void sbr_mark(StructByReference *);
VALUE rbffi_StructByReferenceClass = Qnil;
static VALUE
sbr_allocate(VALUE klass)
{
StructByReference* sbr;
VALUE obj = Data_Make_Struct(klass, StructByReference, sbr_mark, -1, sbr);
sbr->rbStructClass = Qnil;
return obj;
}
/*
* call-seq: initialize(struc_class)
* @param [Struct] struct_calss
* @return [self]
* A new instance of StructByReference.
*/
static VALUE
sbr_initialize(VALUE self, VALUE rbStructClass)
{
StructByReference* sbr = NULL;
if (!rb_class_inherited_p(rbStructClass, rbffi_StructClass)) {
rb_raise(rb_eTypeError, "wrong type (expected subclass of FFI::Struct)");
}
Data_Get_Struct(self, StructByReference, sbr);
sbr->rbStructClass = rbStructClass;
return self;
}
static void
sbr_mark(StructByReference *sbr)
{
rb_gc_mark(sbr->rbStructClass);
}
/*
* call-seq: struct_class
* @return [Struct]
* Get +struct_class+.
*/
static VALUE
sbr_struct_class(VALUE self)
{
StructByReference* sbr;
Data_Get_Struct(self, StructByReference, sbr);
return sbr->rbStructClass;
}
/*
* call-seq: native_type
* @return [Class]
* Always get {FFI::Type}::POINTER.
*/
static VALUE
sbr_native_type(VALUE self)
{
return rb_const_get(rbffi_TypeClass, rb_intern("POINTER"));
}
/*
* call-seq: to_native(value, ctx)
* @param [nil, Struct] value
* @param [nil] ctx
* @return [AbstractMemory] Pointer on +value+.
*/
static VALUE
sbr_to_native(VALUE self, VALUE value, VALUE ctx)
{
StructByReference* sbr;
Struct* s;
if (unlikely(value == Qnil)) {
return rbffi_NullPointerSingleton;
}
Data_Get_Struct(self, StructByReference, sbr);
if (!rb_obj_is_kind_of(value, sbr->rbStructClass)) {
rb_raise(rb_eTypeError, "wrong argument type %s (expected %s)",
rb_obj_classname(value),
RSTRING_PTR(rb_class_name(sbr->rbStructClass)));
}
Data_Get_Struct(value, Struct, s);
return s->rbPointer;
}
/*
* call-seq: from_native(value, ctx)
* @param [AbstractMemory] value
* @param [nil] ctx
* @return [Struct]
* Create a struct from content of memory +value+.
*/
static VALUE
sbr_from_native(VALUE self, VALUE value, VALUE ctx)
{
StructByReference* sbr;
Data_Get_Struct(self, StructByReference, sbr);
return rb_class_new_instance(1, &value, sbr->rbStructClass);
}
void
rbffi_StructByReference_Init(VALUE moduleFFI)
{
/*
* Document-class: FFI::StructByReference
* This class includes {FFI::DataConverter} module.
*/
rbffi_StructByReferenceClass = rb_define_class_under(moduleFFI, "StructByReference", rb_cObject);
rb_global_variable(&rbffi_StructByReferenceClass);
rb_include_module(rbffi_StructByReferenceClass, rb_const_get(moduleFFI, rb_intern("DataConverter")));
rb_define_alloc_func(rbffi_StructByReferenceClass, sbr_allocate);
rb_define_method(rbffi_StructByReferenceClass, "initialize", sbr_initialize, 1);
rb_define_method(rbffi_StructByReferenceClass, "struct_class", sbr_struct_class, 0);
rb_define_method(rbffi_StructByReferenceClass, "native_type", sbr_native_type, 0);
rb_define_method(rbffi_StructByReferenceClass, "to_native", sbr_to_native, 2);
rb_define_method(rbffi_StructByReferenceClass, "from_native", sbr_from_native, 2);
}
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