1 files changed, 70 insertions, 0 deletions
diff --git a/format/packfile/ingest/state.go b/format/packfile/ingest/state.go
new file mode 100644
index 00000000..797323b2
--- /dev/null
+++ b/format/packfile/ingest/state.go
@@ -0,0 +1,70 @@
+package ingest
+
+import (
+	"io"
+	"os"
+
+	objectid "codeberg.org/lindenii/furgit/object/id"
+)
+
+const (
+	defaultDeltaBaseCacheMaxBytes = 32 << 20
+)
+
+// ingestState holds mutable state for one Ingest call.
+type ingestState struct {
+	src         io.Reader
+	destination *os.Root
+	algo        objectid.Algorithm
+	opts        Options
+
+	packHeaderRaw [packHeaderSize]byte
+
+	packFile    *os.File
+	packTmpName string
+	idxFile     *os.File
+	idxTmpName  string
+	revFile     *os.File
+	revTmpName  string
+
+	stream *streamScanner
+
+	records             []objectRecord
+	ofsDeltas           []ofsDeltaRef
+	refDeltas           []refDeltaRef
+	unresolvedRefDeltas []int
+	offsetToRecord      map[uint64]int
+	objectToRecord      map[objectid.ObjectID]int
+
+	baseCache *deltaBaseCache
+	packHash  objectid.ObjectID
+
+	objectCountHeader uint32
+	thinFixed         bool
+}
+
+// newIngestState constructs one call-local ingest state.
+func newIngestState(
+	src io.Reader,
+	destination *os.Root,
+	algo objectid.Algorithm,
+	opts Options,
+	header HeaderInfo,
+	headerRaw [packHeaderSize]byte,
+) (*ingestState, error) {
+	if algo.Size() == 0 {
+		return nil, objectid.ErrInvalidAlgorithm
+	}
+
+	return &ingestState{
+		src:               src,
+		destination:       destination,
+		algo:              algo,
+		opts:              opts,
+		packHeaderRaw:     headerRaw,
+		objectCountHeader: header.ObjectCount,
+		offsetToRecord:    make(map[uint64]int),
+		objectToRecord:    make(map[objectid.ObjectID]int),
+		baseCache:         newDeltaBaseCache(defaultDeltaBaseCacheMaxBytes),
+	}, nil
+}