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package ingest
import (
"encoding/binary"
"slices"
"codeberg.org/lindenii/furgit/internal/intconv"
"codeberg.org/lindenii/furgit/internal/progress"
)
const (
revMagic = 0x52494458
revVersion = 1
)
// writeRev writes rev index for resolved records.
func writeRev(state *ingestState) error {
if !state.opts.WriteRev {
return nil
}
idxOrder := buildIdxOrder(state)
recordToIdxPos := make([]int, len(state.records))
for pos, recordIdx := range idxOrder {
recordToIdxPos[recordIdx] = pos
}
packOrder := buildPackOrder(state)
hashImpl, err := state.algo.New()
if err != nil {
return err
}
var scratch [8]byte
writeProgressf(state, "writing reverse index header...\r")
binary.BigEndian.PutUint32(scratch[:4], revMagic)
err = writeAndHash(state.revFile, hashImpl, scratch[:4])
if err != nil {
return err
}
binary.BigEndian.PutUint32(scratch[:4], revVersion)
err = writeAndHash(state.revFile, hashImpl, scratch[:4])
if err != nil {
return err
}
binary.BigEndian.PutUint32(scratch[:4], state.algo.PackHashID())
err = writeAndHash(state.revFile, hashImpl, scratch[:4])
if err != nil {
return err
}
writeProgressf(state, "writing reverse index header: done.\n")
entriesMeter := progress.New(progress.Options{
Writer: state.opts.Progress,
Title: "writing reverse index entries",
Total: uint64(len(packOrder)),
})
var entriesDone uint64
for _, recordIdx := range packOrder {
recordPos, err := intconv.IntToUint32(recordToIdxPos[recordIdx])
if err != nil {
return err
}
binary.BigEndian.PutUint32(scratch[:4], recordPos)
err = writeAndHash(state.revFile, hashImpl, scratch[:4])
if err != nil {
return err
}
entriesDone++
entriesMeter.Set(entriesDone, 0)
}
if entriesDone > 0 {
entriesMeter.Stop("done")
}
writeProgressf(state, "writing reverse index trailer...\r")
err = writeAndHash(state.revFile, hashImpl, state.packHash.Bytes())
if err != nil {
return err
}
revHash := hashImpl.Sum(nil)
_, err = state.revFile.Write(revHash)
if err != nil {
return err
}
err = state.revFile.Sync()
if err != nil {
return err
}
writeProgressf(state, "writing reverse index trailer: done.\n")
return nil
}
// buildPackOrder returns record indexes sorted by pack offset.
func buildPackOrder(state *ingestState) []int {
out := make([]int, 0, len(state.records))
for idx := range state.records {
out = append(out, idx)
}
slices.SortFunc(out, func(a, b int) int {
offA := state.records[a].offset
offB := state.records[b].offset
switch {
case offA < offB:
return -1
case offA > offB:
return 1
default:
return 0
}
})
return out
}
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