func (self *Graphics) reader(index IndexStruct) (*utils.ByteSlice, error) {
data := utils.NewByteSlice(self.data)
err := data.Seek(index.StartAddress)
if err != nil {
return nil, err
}
return data, nil
}
// Creates a new SaveState from an uncompressed state file.
//
// Use the RLE decoder to uncompress before handing the raw data to this function.
// The function errors out if state is of the wrong length.
func NewSaveState(state []byte) (*SaveState, error) {
s := &SaveState{nil}
if len(state) != SaveStateSize {
return s, errors.New("Save states must be exactly " + strconv.Itoa(SaveStateSize) + " bytes in size.")
}
s.data = utils.NewByteSlice(state)
return s, nil
}
func (d *IndexDecoder) Decode(data []byte) (Index, error) {
elements := len(data) / 16
result := make([]IndexStruct, 0, elements)
input := utils.NewByteSlice(data)
for input.At() < input.Size() {
result = append(result, IndexStruct{
input.ConsumeUint32(),
input.ConsumeUint16(),
input.ConsumeUint16(),
input.ConsumeInt16(),
input.ConsumeInt16(),
ElementType(input.ConsumeByte() & 0x0F),
})
// padding
input.Skip(3)
}
return Index{result}, nil
}