public.go

package ikea

import (
	"io"
	"reflect"
)

// Unpack will read exactly enough bytes from the specified Reader in order to fill the value passed to data.
// if data is not a pointer Unpack will panic
func Unpack(r io.Reader, data interface{}) error {
	pv := reflect.ValueOf(data)
	if pv.Kind() != reflect.Ptr {
		panic("passed data argument is not a pointer")
	}

	v := pv.Elem()
	h := getTypeHandler(v.Type())

	return handleVariableReader(r, h, v)
}

// Pack will write the value passed in data to the specified Writer
func Pack(w io.Writer, data interface{}) error {
	v := reflect.Indirect(reflect.ValueOf(data))
	h := getTypeHandler(v.Type())

	return handleVariableWriter(w, h, v)
}

// Len will return the amount of bytes Pack will use.
func Len(data interface{}) int {
	v := reflect.Indirect(reflect.ValueOf(data))
	h := getTypeHandler(v.Type())

	return handleVariableLength(h, v)
}