1 files changed, 36 insertions, 0 deletions
diff --git a/objectstore/packed/idx.go b/objectstore/packed/idx.go
new file mode 100644
index 00000000..db6a0136
--- /dev/null
+++ b/objectstore/packed/idx.go
@@ -0,0 +1,36 @@
+package packed
+
+import (
+	"os"
+
+	"codeberg.org/lindenii/furgit/objectid"
+)
+
+// idxFile stores one mapped and validated idx v2 file.
+type idxFile struct {
+	// idxName is the basename of this .idx file.
+	idxName string
+	// packName is the matching .pack basename.
+	packName string
+	// algo is the hash algorithm encoded by the index.
+	algo objectid.Algorithm
+
+	// file is the opened index file descriptor.
+	file *os.File
+	// data is the mapped index bytes.
+	data []byte
+
+	// fanout stores fanout table values.
+	fanout [256]uint32
+	// numObjects equals fanout[255].
+	numObjects int
+
+	// namesOffset starts the sorted object-id table.
+	namesOffset int
+	// offset32Offset starts the 32-bit offset table.
+	offset32Offset int
+	// offset64Offset starts the 64-bit offset table.
+	offset64Offset int
+	// offset64Count is the number of 64-bit offset entries.
+	offset64Count int
+}