Class: FFI::StructLayout::Array

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

Instance Method Summary collapse

Methods inherited from Field

#alignment, #initialize, #name, #offset, #size, #type

Constructor Details

This class inherits a constructor from FFI::StructLayout::Field

Instance Method Details

#get(pointer) ⇒ Object 



221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
 
# File 'ext/ffi_c/StructLayout.c', line 221

static VALUE
array_field_get(VALUE self, VALUE pointer)
{
    StructField* f;
    ArrayType* array;
    VALUE argv[2];

    Data_Get_Struct(self, StructField, f);
    Data_Get_Struct(f->rbType, ArrayType, array);

    argv[0] = pointer;
    argv[1] = self;

    return rb_class_new_instance(2, argv, isCharArray(array)
            ? rbffi_StructLayoutCharArrayClass : rbffi_StructInlineArrayClass);
}

#put(pointer, value) ⇒ Object 



238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
 
# File 'ext/ffi_c/StructLayout.c', line 238

static VALUE
array_field_put(VALUE self, VALUE pointer, VALUE value)
{
    StructField* f;
    ArrayType* array;
    

    Data_Get_Struct(self, StructField, f);
    Data_Get_Struct(f->rbType, ArrayType, array);
    
    if (isCharArray(array) && rb_obj_is_instance_of(value, rb_cString)) {
        VALUE argv[2];

        argv[0] = INT2FIX(f->offset);
        argv[1] = value;

        rb_funcall2(pointer, rb_intern("put_string"), 2, argv);

    } else {
#ifdef notyet
        MemoryOp* op;
        int count = RARRAY_LEN(value);
        int i;
        AbstractMemory* memory = MEMORY(pointer);

        if (count > array->length) {
            rb_raise(rb_eIndexError, "array too large");
        }

        // clear the contents in case of a short write
        checkWrite(memory);
        checkBounds(memory, f->offset, f->type->ffiType->size);
        if (count < array->length) {
            memset(memory->address + f->offset + (count * array->componentType->ffiType->size),
                    0, (array->length - count) * array->componentType->ffiType->size);
        }

        // now copy each element in
        if ((op = get_memory_op(array->componentType)) != NULL) {

            for (i = 0; i < count; ++i) {
                (*op->put)(memory, f->offset + (i * array->componentType->ffiType->size), rb_ary_entry(value, i));
            }

        } else if (array->componentType->nativeType == NATIVE_STRUCT) {

            for (i = 0; i < count; ++i) {
                VALUE entry = rb_ary_entry(value, i);
                Struct* s;

                if (!rb_obj_is_kind_of(entry, rbffi_StructClass)) {
                    rb_raise(rb_eTypeError, "array element not an instance of FFI::Struct");
                    break;
                }

                Data_Get_Struct(entry, Struct, s);
                checkRead(s->pointer);
                checkBounds(s->pointer, 0, array->componentType->ffiType->size);

                memcpy(memory->address + f->offset + (i * array->componentType->ffiType->size),
                        s->pointer->address, array->componentType->ffiType->size);
            }

        } else {
            rb_raise(rb_eNotImpError, "put not supported for arrays of type %s", rb_obj_classname(array->rbComponentType));
        }
#else
        rb_raise(rb_eNotImpError, "cannot set array field");
#endif
    }

    return value;
}