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package read
import (
"encoding/binary"
"codeberg.org/lindenii/furgit/format/commitgraph"
"codeberg.org/lindenii/furgit/internal/intconv"
)
func (reader *Reader) readGenerationV2(layer *layer, index uint32, commitTime uint64) (uint64, error) {
if len(layer.chunkGeneration) == 0 {
return 0, nil
}
off64 := uint64(index) * 4
off, err := intconv.Uint64ToInt(off64)
if err != nil {
return 0, err
}
value := binary.BigEndian.Uint32(layer.chunkGeneration[off : off+4])
if value&commitgraph.GenerationOverflow == 0 {
return commitTime + uint64(value), nil
}
gdo2Index := value ^ commitgraph.GenerationOverflow
gdo2Off64 := uint64(gdo2Index) * 8
gdo2Off, err := intconv.Uint64ToInt(gdo2Off64)
if err != nil {
return 0, err
}
if gdo2Off+8 > len(layer.chunkGenerationOv) {
return 0, &ErrMalformed{Path: layer.path, Reason: "GDO2 index out of range"}
}
overflow := binary.BigEndian.Uint64(layer.chunkGenerationOv[gdo2Off : gdo2Off+8])
return commitTime + overflow, nil
}
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