Class: FFI::StructLayout::Field

Inherits:
Object
  • Object
show all
Defined in:
ext/ffi_c/StructLayout.c

Direct Known Subclasses

Array, Function, StructByValue

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 81

static VALUE
struct_field_initialize(int argc, VALUE* argv, VALUE self)
{
    VALUE rbOffset = Qnil, rbName = Qnil, rbType = Qnil;
    StructField* field;
    int nargs;

    Data_Get_Struct(self, StructField, field);

    nargs = rb_scan_args(argc, argv, "3", &rbName, &rbOffset, &rbType);

    if (TYPE(rbName) != T_SYMBOL && TYPE(rbName) != T_STRING) {
        rb_raise(rb_eTypeError, "wrong argument type %s (expected Symbol/String)",
                rb_obj_classname(rbName));
    }

    Check_Type(rbOffset, T_FIXNUM);

    if (!rb_obj_is_kind_of(rbType, rbffi_TypeClass)) {
        rb_raise(rb_eTypeError, "wrong argument type %s (expected FFI::Type)",
                rb_obj_classname(rbType));
    }

    field->offset = NUM2UINT(rbOffset);
    field->rbName = (TYPE(rbName) == T_SYMBOL) ? rbName : rb_str_intern(rbName);
    field->rbType = rbType;
    Data_Get_Struct(field->rbType, Type, field->type);

    return self;
}

Instance Method Details

#alignment ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 128

static VALUE
struct_field_alignment(VALUE self)
{
    StructField* field;
    Data_Get_Struct(self, StructField, field);
    return UINT2NUM(field->type->ffiType->alignment);
}

#ffi_type ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 136

static VALUE
struct_field_ffi_type(VALUE self)
{
    StructField* field;
    Data_Get_Struct(self, StructField, field);
    return field->rbType;
}

#get(pointer) ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 152

static VALUE
struct_field_get(VALUE self, VALUE pointer)
{
    StructField* f;
    MemoryOp* op;
    AbstractMemory* memory = MEMORY(pointer);

    Data_Get_Struct(self, StructField, f);
    op = memory_get_op(memory, f->type);
    if (op == NULL) {
        rb_raise(rb_eArgError, "get not supported for %s", rb_obj_classname(self));
        return Qnil;
    }

    return (*op->get)(memory, f->offset);
}

#name ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 144

static VALUE
struct_field_name(VALUE self)
{
    StructField* field;
    Data_Get_Struct(self, StructField, field);
    return field->rbName;
}

#offset ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 112

static VALUE
struct_field_offset(VALUE self)
{
    StructField* field;
    Data_Get_Struct(self, StructField, field);
    return UINT2NUM(field->offset);
}

#put(pointer, value) ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 169

static VALUE
struct_field_put(VALUE self, VALUE pointer, VALUE value)
{
    StructField* f;
    MemoryOp* op;
    AbstractMemory* memory = MEMORY(pointer);

    Data_Get_Struct(self, StructField, f);
    op = memory_get_op(memory, f->type);
    if (op == NULL) {
        rb_raise(rb_eArgError, "put not supported for %s", rb_obj_classname(self));
        return self;
    }

    (*op->put)(memory, f->offset, value);

    return self;
}

#size ⇒ Object 



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# File 'ext/ffi_c/StructLayout.c', line 120

static VALUE
struct_field_size(VALUE self)
{
    StructField* field;
    Data_Get_Struct(self, StructField, field);
    return UINT2NUM(field->type->ffiType->size);
}