public function parse()
{
if (!file_exists($this->ops_ply)) {
return false;
}
$vn_mode = PlyToStl::MODE_HEADER;
$vo_handle = @fopen($this->ops_ply, "r");
$vn_v = $vn_f = 0;
if ($vo_handle) {
if (($vs_line = fgets($vo_handle)) !== false) {
// make sure we're dealing with a ply file
if (!PlyToStl::startswith($vs_line, 'ply')) {
return false;
}
}
while (($vs_line = fgets($vo_handle)) !== false) {
switch ($vn_mode) {
case PlyToStl::MODE_HEADER:
// process headers (face and element count)
if (PlyToStl::startswith($vs_line, 'element face')) {
$this->opn_element_face = intval(PlyToStl::getword($vs_line, 2));
$this->opa_faces = new SplFixedArray($this->opn_element_face);
}
if (PlyToStl::startswith($vs_line, 'element vertex')) {
$this->opn_element_vertex = intval(PlyToStl::getword($vs_line, 2));
$this->opa_vertices = new SplFixedArray($this->opn_element_vertex);
}
// end of header reached, switch to vertex mode (they're next in the file)
if (PlyToStl::startswith($vs_line, 'end_header')) {
$vn_mode = PlyToStl::MODE_VERTEX;
}
break;
case PlyToStl::MODE_VERTEX:
// instead of simply adding a (memory-consuming) PHP array here, we pack
// the values we need in a binary string. this is much more memory-efficient,
// especially in combination with using SplFixedArray
$this->opa_vertices[$vn_v] = pack("f*", floatval(PlyToStl::getword($vs_line, 0)), floatval(PlyToStl::getword($vs_line, 1)), floatval(PlyToStl::getword($vs_line, 2)));
$vn_v++;
// vertex count reached, switch to faces
if ($vn_v == $this->opn_element_vertex) {
$vn_mode = PlyToStl::MODE_FACES;
}
break;
case PlyToStl::MODE_FACES:
// instead of simply adding a (memory-consuming) PHP array here, we pack
// the values we need in a binary string. this is much more memory-efficient,
// especially in combination with using SplFixedArray
$this->opa_faces[$vn_f] = pack("I*", intval(PlyToStl::getword($vs_line, 1)), intval(PlyToStl::getword($vs_line, 2)), intval(PlyToStl::getword($vs_line, 3)));
$vn_f++;
// face count reached, we're done
if ($vn_f == $this->opn_element_face) {
$vn_mode = PlyToStl::MODE_NONE;
break 2;
}
break;
default:
break;
// shouldn't happen
}
}
fclose($vo_handle);
}
}
