/*
Returns a new 1-D array initialized from binary raw data in a string.
@overload from_string(string,[shape])
@param [String] string Binary raw data.
@param [Array] shape array of integers representing array shape.
@return [Numo::NArray] NArray containing binary data.
*/
static VALUE
nary_s_from_string(int argc, VALUE *argv, VALUE type)
{
size_t len, str_len, elmsz;
size_t *shape;
char *ptr;
int i, nd, narg;
VALUE vstr,vshape,vna;
narg = rb_scan_args(argc,argv,"11",&vstr,&vshape);
str_len = RSTRING_LEN(vstr);
elmsz = na_dtype_elmsz(type);
if (narg==2) {
nd = RARRAY_LEN(vshape);
if (nd == 0 || nd > NA_MAX_DIMENSION) {
rb_raise(nary_eDimensionError,"too long or empty shape (%d)", nd);
}
shape = ALLOCA_N(size_t,nd);
len = 1;
for (i=0; i<nd; ++i) {
len *= shape[i] = NUM2SIZE(RARRAY_AREF(vshape,i));
}
if (len*elmsz != str_len) {
rb_raise(rb_eArgError, "size mismatch");
}
} else {
nd = 1;
shape = ALLOCA_N(size_t,nd);
shape[0] = len = str_len / elmsz;
if (len == 0) {
rb_raise(rb_eArgError, "string is empty or too short");
}
}
vna = rb_narray_new(type, nd, shape);
ptr = na_get_pointer_for_write(vna);
memcpy(ptr, RSTRING_PTR(vstr), elmsz*len);
return vna;
}
VALUE
na_make_view_struct(VALUE self, VALUE dtype, VALUE offset)
{
size_t i, n;
int j, k, ndim;
size_t *shape;
size_t *idx1, *idx2;
ssize_t stride;
stridx_t *stridx;
narray_t *na, *nt;
narray_view_t *na1, *na2;
VALUE klass;
volatile VALUE view;
GetNArray(self,na);
// build from Numo::Struct
if (rb_obj_is_kind_of(dtype,cNArray)) {
GetNArray(dtype,nt);
ndim = na->ndim + nt->ndim;
shape = ALLOCA_N(size_t,ndim);
// struct dimensions
for (j=0; j<na->ndim; j++) {
shape[j] = na->shape[j];
}
// member dimension
for (j=na->ndim,k=0; j<ndim; j++,k++) {
shape[j] = nt->shape[k];
}
klass = CLASS_OF(dtype);
stridx = ALLOC_N(stridx_t, ndim);
stride = na_dtype_elmsz(klass);
for (j=ndim,k=nt->ndim; k; ) {
SDX_SET_STRIDE(stridx[--j],stride);
stride *= nt->shape[--k];
}
} else {
ndim = na->ndim;
shape = ALLOCA_N(size_t,ndim);
for (j=0; j<ndim; j++) {
shape[j] = na->shape[j];
}
klass = CLASS_OF(self);
if (TYPE(dtype)==T_CLASS) {
if (RTEST(rb_class_inherited_p(dtype,cNArray))) {
klass = dtype;
}
}
stridx = ALLOC_N(stridx_t, ndim);
}
view = na_s_allocate_view(klass);
na_copy_flags(self, view);
GetNArrayView(view, na2);
na_setup_shape((narray_t*)na2, ndim, shape);
na2->stridx = stridx;
switch(na->type) {
case NARRAY_DATA_T:
case NARRAY_FILEMAP_T:
stride = na_get_elmsz(self);
for (j=na->ndim; j--;) {
SDX_SET_STRIDE(na2->stridx[j], stride);
stride *= na->shape[j];
}
na2->offset = 0;
na2->data = self;
break;
case NARRAY_VIEW_T:
GetNArrayView(self, na1);
for (j=na1->base.ndim; j--; ) {
if (SDX_IS_INDEX(na1->stridx[j])) {
n = na1->base.shape[j];
idx1 = SDX_GET_INDEX(na1->stridx[j]);
idx2 = ALLOC_N(size_t, na1->base.shape[j]);
for (i=0; i<n; i++) {
idx2[i] = idx1[i];
}
SDX_SET_INDEX(na2->stridx[j],idx2);
} else {
na2->stridx[j] = na1->stridx[j];
}
}
na2->offset = na1->offset;
na2->data = na1->data;
break;
}
if (RTEST(offset)) {
na2->offset += NUM2SIZET(offset);
}
return view;
}
static VALUE
nstruct_add_type(VALUE type, int argc, VALUE *argv, VALUE nst)
{
VALUE ofs, size;
ID id;
int i;
VALUE name=Qnil;
size_t *shape=NULL;
int ndim=0;
ssize_t stride;
narray_view_t *nt;
int j;
for (i=0; i<argc; i++) {
switch(TYPE(argv[i])) {
case T_STRING:
case T_SYMBOL:
if (NIL_P(name)) {
name = argv[i];
break;
}
rb_raise(rb_eArgError,"multiple name in struct definition");
case T_ARRAY:
if (shape) {
rb_raise(rb_eArgError,"multiple shape in struct definition");
}
ndim = RARRAY_LEN(argv[i]);
if (ndim > NA_MAX_DIMENSION) {
rb_raise(rb_eArgError,"too large number of dimensions");
}
if (ndim == 0) {
rb_raise(rb_eArgError,"array is empty");
}
shape = ALLOCA_N(size_t, ndim);
na_array_to_internal_shape(Qnil, argv[i], shape);
break;
}
}
id = rb_to_id(name);
name = ID2SYM(id);
if (rb_obj_is_kind_of(type,cNArray)) {
narray_t *na;
GetNArray(type,na);
type = CLASS_OF(type);
ndim = na->ndim;
shape = na->shape;
}
type = rb_narray_view_new(type,ndim,shape);
GetNArrayView(type,nt);
nt->stridx = ALLOC_N(stridx_t,ndim);
stride = na_dtype_elmsz(CLASS_OF(type));
for (j=ndim; j--; ) {
SDX_SET_STRIDE(nt->stridx[j], stride);
stride *= shape[j];
}
ofs = rb_iv_get(nst, "__offset__");
nt->offset = NUM2SIZET(ofs);
size = rb_funcall(type, rb_intern("byte_size"), 0);
rb_iv_set(nst, "__offset__", rb_funcall(ofs,'+',1,size));
rb_ary_push(rb_iv_get(nst,"__members__"),
rb_ary_new3(4,name,type,ofs,size)); // <- field definition
return Qnil;
}
