// cAttribute returns the start address and the length of an attribute list.
func cAttributeList(a []*Attribute) (arena, C.CK_ATTRIBUTE_PTR, C.CK_ULONG) {
var arena arena
if len(a) == 0 {
return nil, nil, 0
}
pa := make([]C.CK_ATTRIBUTE, len(a))
for i := 0; i < len(a); i++ {
pa[i]._type = C.CK_ATTRIBUTE_TYPE(a[i].Type)
if a[i].Value == nil {
continue
}
pa[i].pValue, pa[i].ulValueLen = arena.Allocate(a[i].Value)
}
return arena, C.CK_ATTRIBUTE_PTR(&pa[0]), C.CK_ULONG(len(a))
}
// cAttribute returns the start address and the length of an attribute list.
func cAttributeList(a []*Attribute) (C.CK_ATTRIBUTE_PTR, C.CK_ULONG) {
if len(a) == 0 {
return nil, 0
}
pa := make([]C.CK_ATTRIBUTE, len(a))
for i := 0; i < len(a); i++ {
pa[i]._type = C.CK_ATTRIBUTE_TYPE(a[i].Type)
if a[i].Value == nil {
continue
}
pa[i].pValue = C.CK_VOID_PTR((&a[i].Value[0]))
pa[i].ulValueLen = C.CK_ULONG(len(a[i].Value))
}
return C.CK_ATTRIBUTE_PTR(&pa[0]), C.CK_ULONG(len(a))
}
/* GetAttributeValue obtains the value of one or more object attributes. */
func (c *Ctx) GetAttributeValue(sh SessionHandle, o ObjectHandle, a []*Attribute) ([]*Attribute, error) {
// copy the attribute list and make all the values nil, so that
// the C function can (allocate) fill them in
pa := make([]C.CK_ATTRIBUTE, len(a))
for i := 0; i < len(a); i++ {
pa[i]._type = C.CK_ATTRIBUTE_TYPE(a[i].Type)
}
e := C.GetAttributeValue(c.ctx, C.CK_SESSION_HANDLE(sh), C.CK_OBJECT_HANDLE(o), C.CK_ATTRIBUTE_PTR(&pa[0]), C.CK_ULONG(len(a)))
if toError(e) != nil {
return nil, toError(e)
}
a1 := make([]*Attribute, len(a))
for i, c := range pa {
x := new(Attribute)
x.Type = uint(c._type)
if int(c.ulValueLen) != -1 {
x.Value = C.GoBytes(unsafe.Pointer(c.pValue), C.int(c.ulValueLen))
C.free(unsafe.Pointer(c.pValue))
}
a1[i] = x
}
return a1, nil
}