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package read
import (
"encoding/binary"
"codeberg.org/lindenii/furgit/commitgraph"
"codeberg.org/lindenii/furgit/internal/intconv"
)
func (reader *Reader) decodeExtraEdgeList(layer *layer, edgeStart uint32) ([]Position, error) {
if len(layer.chunkExtraEdges) == 0 {
return nil, &MalformedError{Path: layer.path, Reason: "missing EDGE chunk"}
}
out := make([]Position, 0)
cur := edgeStart
for {
off64 := uint64(cur) * 4
off, err := intconv.Uint64ToInt(off64)
if err != nil {
return nil, err
}
if off+4 > len(layer.chunkExtraEdges) {
return nil, &MalformedError{Path: layer.path, Reason: "EDGE index out of range"}
}
word := binary.BigEndian.Uint32(layer.chunkExtraEdges[off : off+4])
parentGlobal := word & commitgraph.ParentLastMask
parentPos, err := reader.globalToPosition(parentGlobal)
if err != nil {
return nil, err
}
out = append(out, parentPos)
if word&commitgraph.ParentExtraMask != 0 {
break
}
cur++
}
return out, nil
}
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