Method: FFI::AbstractMemory#get

Defined in:
ext/ffi_c/AbstractMemory.c

#get(type, offset) ⇒ Object

Return data of given type contained in memory.

Parameters:

  • type_name (Symbol, Type) —

    type of data to get

  • offset (Integer) —

    point in buffer to start from

Returns:

  • (Object)

Raises:

  • (ArgumentError) —

    if type is not supported



347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
 
# File 'ext/ffi_c/AbstractMemory.c', line 347

static VALUE
memory_get(VALUE self, VALUE type_name, VALUE offset)
{
    AbstractMemory* ptr;
    VALUE nType;
    Type *type;
    MemoryOp *op;

    nType = rbffi_Type_Lookup(type_name);
    if(NIL_P(nType)) goto undefined_type;

    TypedData_Get_Struct(self, AbstractMemory, &rbffi_abstract_memory_data_type, ptr);
    TypedData_Get_Struct(nType, Type, &rbffi_type_data_type, type);

    op = get_memory_op(type);
    if(op == NULL) goto undefined_type;

    return op->get(ptr, NUM2LONG(offset));

undefined_type: {
    VALUE msg = rb_sprintf("undefined type '%" PRIsVALUE "'", type_name);
    rb_exc_raise(rb_exc_new3(rb_eArgError, msg));
    return Qnil;
  }
}