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package ingest
import (
"fmt"
"io"
"codeberg.org/lindenii/furgit/internal/compress/zlib"
objectheader "codeberg.org/lindenii/furgit/object/header"
objectid "codeberg.org/lindenii/furgit/object/id"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// drainEntryPayload inflates one entry payload from stream and returns
// (inflatedLength, oidForBaseEntry).
func drainEntryPayload(state *ingestState, record objectRecord) (int64, objectid.ObjectID, error) {
var zero objectid.ObjectID
reader, err := zlib.NewReader(state.stream)
if err != nil {
return 0, zero, &MalformedPackEntryError{Offset: record.offset, Reason: fmt.Sprintf("open zlib stream: %v", err)}
}
defer func() { _ = reader.Close() }()
var total int64
if record.packedType.IsBaseObject() {
header, ok := objectheader.Encode(record.packedType, record.declaredSize)
if !ok {
return 0, zero, &MalformedPackEntryError{Offset: record.offset, Reason: "encode object header"}
}
hashImpl, err := state.algo.New()
if err != nil {
return 0, zero, err
}
_, _ = hashImpl.Write(header)
n, err := io.Copy(hashImpl, reader)
if err != nil {
return 0, zero, &MalformedPackEntryError{Offset: record.offset, Reason: fmt.Sprintf("inflate base object: %v", err)}
}
total = n
oid, err := objectid.FromBytes(state.algo, hashImpl.Sum(nil))
if err != nil {
return 0, zero, err
}
return total, oid, nil
}
if record.packedType == objecttype.TypeOfsDelta || record.packedType == objecttype.TypeRefDelta {
n, err := io.Copy(io.Discard, reader)
if err != nil {
return 0, zero, &MalformedPackEntryError{Offset: record.offset, Reason: fmt.Sprintf("inflate delta payload: %v", err)}
}
total = n
return total, zero, nil
}
return 0, zero, &MalformedPackEntryError{Offset: record.offset, Reason: "unsupported payload type"}
}
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