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package ingest
import (
"compress/zlib"
"fmt"
"io"
"codeberg.org/lindenii/furgit/internal/intconv"
)
// inflateRecordPayload inflates one record's zlib payload from pack file.
func inflateRecordPayload(state *ingestState, idx int) ([]byte, error) {
record := state.records[idx]
if record.packedLen < uint64(record.headerLen) {
return nil, &MalformedPackEntryError{Offset: record.offset, Reason: "entry packed span underflow"}
}
compressedOffset := record.offset + uint64(record.headerLen)
compressedLen := record.packedLen - uint64(record.headerLen)
compressedOffsetInt64, err := intconv.Uint64ToInt64(compressedOffset)
if err != nil {
return nil, err
}
compressedLenInt64, err := intconv.Uint64ToInt64(compressedLen)
if err != nil {
return nil, err
}
section := io.NewSectionReader(state.packFile, compressedOffsetInt64, compressedLenInt64)
reader, err := zlib.NewReader(section)
if err != nil {
return nil, &MalformedPackEntryError{Offset: record.offset, Reason: fmt.Sprintf("open payload zlib: %v", err)}
}
defer func() { _ = reader.Close() }()
out, err := io.ReadAll(reader)
if err != nil {
return nil, &MalformedPackEntryError{Offset: record.offset, Reason: fmt.Sprintf("inflate payload: %v", err)}
}
return out, nil
}
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