1 files changed, 32 insertions, 0 deletions
diff --git a/commitgraph/constants.go b/commitgraph/constants.go
new file mode 100644
index 00000000..3a06a290
--- /dev/null
+++ b/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
+)