From 3e884f5f3d42cbc4874a04da31dde10314b0cfad Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Thu, 26 Mar 2026 09:17:14 +0000
Subject: format: Move commitgraph and packfile here

---
 format/commitgraph/constants.go | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 format/commitgraph/constants.go

(limited to 'format/commitgraph/constants.go')

diff --git a/format/commitgraph/constants.go b/format/commitgraph/constants.go
new file mode 100644
index 00000000..3a06a290
--- /dev/null
+++ b/format/commitgraph/constants.go
@@ -0,0 +1,32 @@
+package commitgraph
+
+const (
+	FileSignature = 0x43475048 // "CGPH"
+	FileVersion   = 1
+)
+
+const (
+	ChunkOIDF = 0x4f494446 // "OIDF"
+	ChunkOIDL = 0x4f49444c // "OIDL"
+	ChunkCDAT = 0x43444154 // "CDAT"
+	ChunkGDA2 = 0x47444132 // "GDA2"
+	ChunkGDO2 = 0x47444f32 // "GDO2"
+	ChunkEDGE = 0x45444745 // "EDGE"
+	ChunkBIDX = 0x42494458 // "BIDX"
+	ChunkBDAT = 0x42444154 // "BDAT"
+	ChunkBASE = 0x42415345 // "BASE"
+)
+
+const (
+	HeaderSize     = 8
+	ChunkEntrySize = 12
+	FanoutSize     = 256 * 4
+)
+
+const (
+	ParentNone      = 0x70000000
+	ParentExtraMask = 0x80000000
+	ParentLastMask  = 0x7fffffff
+
+	GenerationOverflow = 0x80000000
+)
-- 
cgit v1.3.1-10-gc9f91