package packfile
import (
"bytes"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/storage/memory"
. "gopkg.in/check.v1"
"gopkg.in/src-d/go-git-fixtures.v3"
)
type EncoderSuite struct {
fixtures.Suite
buf *bytes.Buffer
store *memory.Storage
enc *Encoder
}
var _ = Suite(&EncoderSuite{})
func (s *EncoderSuite) SetUpTest(c *C) {
s.buf = bytes.NewBuffer(nil)
s.store = memory.NewStorage()
s.enc = NewEncoder(s.buf, s.store, false)
}
func (s *EncoderSuite) TestCorrectPackHeader(c *C) {
hash, err := s.enc.Encode([]plumbing.Hash{}, 10)
c.Assert(err, IsNil)
hb := [20]byte(hash)
// PACK + VERSION + OBJECTS + HASH
expectedResult := []byte{'P', 'A', 'C', 'K', 0, 0, 0, 2, 0, 0, 0, 0}
expectedResult = append(expectedResult, hb[:]...)
result := s.buf.Bytes()
c.Assert(result, DeepEquals, expectedResult)
}
func (s *EncoderSuite) TestCorrectPackWithOneEmptyObject(c *C) {
o := &plumbing.MemoryObject{}
o.SetType(plumbing.CommitObject)
o.SetSize(0)
_, err := s.store.SetEncodedObject(o)
c.Assert(err, IsNil)
hash, err := s.enc.Encode([]plumbing.Hash{o.Hash()}, 10)
c.Assert(err, IsNil)
// PACK + VERSION(2) + OBJECT NUMBER(1)
expectedResult := []byte{'P', 'A', 'C', 'K', 0, 0, 0, 2, 0, 0, 0, 1}
// OBJECT HEADER(TYPE + SIZE)= 0001 0000
expectedResult = append(expectedResult, []byte{16}...)
// Zlib header
expectedResult = append(expectedResult,
[]byte{120, 156, 1, 0, 0, 255, 255, 0, 0, 0, 1}...)
// + HASH
hb := [20]byte(hash)
expectedResult = append(expectedResult, hb[:]...)
result := s.buf.Bytes()
c.Assert(result, DeepEquals, expectedResult)
}
func (s *EncoderSuite) TestMaxObjectSize(c *C) {
o := s.store.NewEncodedObject()
o.SetSize(9223372036854775807)
o.SetType(plumbing.CommitObject)
_, err := s.store.SetEncodedObject(o)
c.Assert(err, IsNil)
hash, err := s.enc.Encode([]plumbing.Hash{o.Hash()}, 10)
c.Assert(err, IsNil)
c.Assert(hash.IsZero(), Not(Equals), true)
}
func (s *EncoderSuite) TestHashNotFound(c *C) {
h, err := s.enc.Encode([]plumbing.Hash{plumbing.NewHash("BAD")}, 10)
c.Assert(h, Equals, plumbing.ZeroHash)
c.Assert(err, NotNil)
c.Assert(err, Equals, plumbing.ErrObjectNotFound)
}
func (s *EncoderSuite) TestDecodeEncodeWithDeltaDecodeREF(c *C) {
s.enc = NewEncoder(s.buf, s.store, true)
s.simpleDeltaTest(c)
}
func (s *EncoderSuite) TestDecodeEncodeWithDeltaDecodeOFS(c *C) {
s.enc = NewEncoder(s.buf, s.store, false)
s.simpleDeltaTest(c)
}
func (s *EncoderSuite) TestDecodeEncodeWithDeltasDecodeREF(c *C) {
s.enc = NewEncoder(s.buf, s.store, true)
s.deltaOverDeltaTest(c)
}
func (s *EncoderSuite) TestDecodeEncodeWithDeltasDecodeOFS(c *C) {
s.enc = NewEncoder(s.buf, s.store, false)
s.deltaOverDeltaTest(c)
}
func (s *EncoderSuite) TestDecodeEncodeWithCycleREF(c *C) {
s.enc = NewEncoder(s.buf, s.store, true)
s.deltaOverDeltaCyclicTest(c)
}
func (s *EncoderSuite) TestDecodeEncodeWithCycleOFS(c *C) {
s.enc = NewEncoder(s.buf, s.store, false)
s.deltaOverDeltaCyclicTest(c)
}
func (s *EncoderSuite) simpleDeltaTest(c *C) {
srcObject := newObject(plumbing.BlobObject, []byte("0"))
targetObject := newObject(plumbing.BlobObject, []byte("01"))
deltaObject, err := GetDelta(srcObject, targetObject)
c.Assert(err, IsNil)
srcToPack := newObjectToPack(srcObject)
encHash, err := s.enc.encode([]*ObjectToPack{
srcToPack,
newDeltaObjectToPack(srcToPack, targetObject, deltaObject),
})
c.Assert(err, IsNil)
scanner := NewScanner(s.buf)
storage := memory.NewStorage()
d, err := NewDecoder(scanner, storage)
c.Assert(err, IsNil)
decHash, err := d.Decode()
c.Assert(err, IsNil)
c.Assert(encHash, Equals, decHash)
decSrc, err := storage.EncodedObject(srcObject.Type(), srcObject.Hash())
c.Assert(err, IsNil)
c.Assert(decSrc, DeepEquals, srcObject)
decTarget, err := storage.EncodedObject(targetObject.Type(), targetObject.Hash())
c.Assert(err, IsNil)
c.Assert(decTarget, DeepEquals, targetObject)
}
func (s *EncoderSuite) deltaOverDeltaTest(c *C) {
srcObject := newObject(plumbing.BlobObject, []byte("0"))
targetObject := newObject(plumbing.BlobObject, []byte("01"))
otherTargetObject := newObject(plumbing.BlobObject, []byte("011111"))
deltaObject, err := GetDelta(srcObject, targetObject)
c.Assert(err, IsNil)
c.Assert(deltaObject.Hash(), Not(Equals), plumbing.ZeroHash)
otherDeltaObject, err := GetDelta(targetObject, otherTargetObject)
c.Assert(err, IsNil)
c.Assert(otherDeltaObject.Hash(), Not(Equals), plumbing.ZeroHash)
srcToPack := newObjectToPack(srcObject)
targetToPack := newObjectToPack(targetObject)
encHash, err := s.enc.encode([]*ObjectToPack{
targetToPack,
srcToPack,
newDeltaObjectToPack(srcToPack, targetObject, deltaObject),
newDeltaObjectToPack(targetToPack, otherTargetObject, otherDeltaObject),
})
c.Assert(err, IsNil)
scanner := NewScanner(s.buf)
storage := memory.NewStorage()
d, err := NewDecoder(scanner, storage)
c.Assert(err, IsNil)
decHash, err := d.Decode()
c.Assert(err, IsNil)
c.Assert(encHash, Equals, decHash)
decSrc, err := storage.EncodedObject(srcObject.Type(), srcObject.Hash())
c.Assert(err, IsNil)
c.Assert(decSrc, DeepEquals, srcObject)
decTarget, err := storage.EncodedObject(targetObject.Type(), targetObject.Hash())
c.Assert(err, IsNil)
c.Assert(decTarget, DeepEquals, targetObject)
decOtherTarget, err := storage.EncodedObject(otherTargetObject.Type(), otherTargetObject.Hash())
c.Assert(err, IsNil)
c.Assert(decOtherTarget, DeepEquals, otherTargetObject)
}
func (s *EncoderSuite) deltaOverDeltaCyclicTest(c *C) {
o1 := newObject(plumbing.BlobObject, []byte("0"))
o2 := newObject(plumbing.BlobObject, []byte("01"))
o3 := newObject(plumbing.BlobObject, []byte("011111"))
o4 := newObject(plumbing.BlobObject, []byte("01111100000"))
_, err := s.store.SetEncodedObject(o1)
c.Assert(err, IsNil)
_, err = s.store.SetEncodedObject(o2)
c.Assert(err, IsNil)
_, err = s.store.SetEncodedObject(o3)
c.Assert(err, IsNil)
_, err = s.store.SetEncodedObject(o4)
c.Assert(err, IsNil)
d2, err := GetDelta(o1, o2)
c.Assert(err, IsNil)
d3, err := GetDelta(o4, o3)
c.Assert(err, IsNil)
d4, err := GetDelta(o3, o4)
c.Assert(err, IsNil)
po1 := newObjectToPack(o1)
pd2 := newDeltaObjectToPack(po1, o2, d2)
pd3 := newObjectToPack(o3)
pd4 := newObjectToPack(o4)
pd3.SetDelta(pd4, d3)
pd4.SetDelta(pd3, d4)
// SetOriginal is used by delta selector when generating ObjectToPack.
// It also fills type, hash and size values to be used when Original
// is nil.
po1.SetOriginal(po1.Original)
pd2.SetOriginal(pd2.Original)
pd2.CleanOriginal()
pd3.SetOriginal(pd3.Original)
pd3.CleanOriginal()
pd4.SetOriginal(pd4.Original)
encHash, err := s.enc.encode([]*ObjectToPack{
po1,
pd2,
pd3,
pd4,
})
c.Assert(err, IsNil)
scanner := NewScanner(s.buf)
storage := memory.NewStorage()
d, err := NewDecoder(scanner, storage)
c.Assert(err, IsNil)
decHash, err := d.Decode()
c.Assert(err, IsNil)
c.Assert(encHash, Equals, decHash)
decSrc, err := storage.EncodedObject(o1.Type(), o1.Hash())
c.Assert(err, IsNil)
c.Assert(decSrc, DeepEquals, o1)
decTarget, err := storage.EncodedObject(o2.Type(), o2.Hash())
c.Assert(err, IsNil)
c.Assert(decTarget, DeepEquals, o2)
decOtherTarget, err := storage.EncodedObject(o3.Type(), o3.Hash())
c.Assert(err, IsNil)
c.Assert(decOtherTarget, DeepEquals, o3)
decAnotherTarget, err := storage.EncodedObject(o4.Type(), o4.Hash())
c.Assert(err, IsNil)
c.Assert(decAnotherTarget, DeepEquals, o4)
}
