Function buildTestPack

plumbing/format/packfile/internal_test.go:76–110

buildTestPack assembles a pack with the given objects, returning the raw pack bytes. Object offsets are not exposed because the only caller does not need them.

(t *testing.T, objects ...testPackObject)

// pack bytes. Object offsets are not exposed because the only caller does
// not need them.
func buildTestPack(t *testing.T, objects ...testPackObject) []byte {
	t.Helper()

	var body bytes.Buffer
	body.WriteString("PACK")
	require.NoError(t, binary.Write(&body, binary.BigEndian, uint32(2)))
	require.NoError(t, binary.Write(&body, binary.BigEndian, uint32(len(objects))))

	offsets := make([]int64, 0, len(objects))
	for _, obj := range objects {
		offsets = append(offsets, int64(body.Len()))
		declaredSize := obj.declaredSize
		if declaredSize == 0 && len(obj.content) > 0 {
			declaredSize = int64(len(obj.content))
		}

		writeTestObjectHeader(&body, obj.typ, declaredSize)
		switch obj.typ {
		case plumbing.REFDeltaObject:
			body.Write(obj.reference[:])
		case plumbing.OFSDeltaObject:
			distance := obj.offsetDeltaDistance
			if distance == -1 {
				// Reference the immediately preceding object.
				distance = offsets[len(offsets)-1] - offsets[len(offsets)-2]
			}
			require.NoError(t, gogitbinary.WriteVariableWidthInt(&body, distance))
		}
		body.Write(zlibCompress(t, obj.content))
	}

	sum := sha1.Sum(body.Bytes())
	body.Write(sum[:])
	return body.Bytes()
}

func writeTestObjectHeader(w io.ByteWriter, typ plumbing.ObjectType, size int64) {
	remaining := uint64(size)