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package read
import "codeberg.org/lindenii/furgit/internal/intconv"
func (reader *Reader) layerByPosition(pos Position) (*layer, error) {
graphIdx, err := intconv.Uint64ToInt(uint64(pos.Graph))
if err != nil {
return nil, err
}
if graphIdx < 0 || graphIdx >= len(reader.layers) {
return nil, &PositionOutOfRangeError{Pos: pos}
}
layer := &reader.layers[graphIdx]
if pos.Index >= layer.numCommits {
return nil, &PositionOutOfRangeError{Pos: pos}
}
return layer, nil
}
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