// Copyright 2015 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package binres

type DataType uint8

// explicitly defined for clarity and resolvability with apt source
const (
	DataNull             DataType = 0x00 // either 0 or 1 for resource undefined or empty
	DataReference        DataType = 0x01 // ResTable_ref, a reference to another resource table entry
	DataAttribute        DataType = 0x02 // attribute resource identifier
	DataString           DataType = 0x03 // index into the containing resource table's global value string pool
	DataFloat            DataType = 0x04 // single-precision floating point number
	DataDimension        DataType = 0x05 // complex number encoding a dimension value, such as "100in"
	DataFraction         DataType = 0x06 // complex number encoding a fraction of a container
	DataDynamicReference DataType = 0x07 // dynamic ResTable_ref, which needs to be resolved before it can be used like a TYPE_REFERENCE.
	DataIntDec           DataType = 0x10 // raw integer value of the form n..n
	DataIntHex           DataType = 0x11 // raw integer value of the form 0xn..n
	DataIntBool          DataType = 0x12 // either 0 or 1, for input "false" or "true"
	DataIntColorARGB8    DataType = 0x1c // raw integer value of the form #aarrggbb
	DataIntColorRGB8     DataType = 0x1d // raw integer value of the form #rrggbb
	DataIntColorARGB4    DataType = 0x1e // raw integer value of the form #argb
	DataIntColorRGB4     DataType = 0x1f // raw integer value of the form #rgb
)

type Data struct {
	ByteSize uint16
	Res0     uint8 // always 0, useful for debugging bad read offsets
	Type     DataType
	Value    uint32
}

func (d *Data) UnmarshalBinary(bin []byte) error {
	d.ByteSize = btou16(bin)
	d.Res0 = uint8(bin[2])
	d.Type = DataType(bin[3])
	d.Value = btou32(bin[4:])
	return nil
}

func (d *Data) MarshalBinary() ([]byte, error) {
	bin := make([]byte, 8)
	putu16(bin, d.ByteSize)
	bin[2] = byte(d.Res0)
	bin[3] = byte(d.Type)
	putu32(bin[4:], d.Value)
	return bin, nil
}