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package pack
import (
"bytes"
"crypto/sha1"
"crypto/sha256"
"encoding/binary"
"hash"
"testing"
"github.com/stretchr/testify/assert"
)
var (
V2IndexHeader = []byte{
0xff, 0x74, 0x4f, 0x63,
0x00, 0x00, 0x00, 0x02,
}
V2IndexFanout = make([]uint32, indexFanoutEntries)
V2IndexCRCs = []byte{
0x0, 0x0, 0x0, 0x0,
0x1, 0x1, 0x1, 0x1,
0x2, 0x2, 0x2, 0x2,
}
V2IndexOffsets = []byte{
0x00, 0x00, 0x00, 0x01,
0x00, 0x00, 0x00, 0x02,
0x80, 0x00, 0x00, 0x01, // use the second large offset
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // filler data
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // large offset
}
)
func TestIndexV2EntryExact(t *testing.T) {
for _, algo := range []hash.Hash{sha1.New(), sha256.New()} {
index := newV2Index(algo)
v := &V2{hash: algo}
e, err := v.Entry(index, 1)
assert.NoError(t, err)
assert.EqualValues(t, 2, e.PackOffset)
}
}
func TestIndexV2EntryExtendedOffset(t *testing.T) {
for _, algo := range []hash.Hash{sha1.New(), sha256.New()} {
index := newV2Index(algo)
v := &V2{hash: algo}
e, err := v.Entry(index, 2)
assert.NoError(t, err)
assert.EqualValues(t, 3, e.PackOffset)
}
}
func TestIndexVersionWidthV2(t *testing.T) {
for _, algo := range []hash.Hash{sha1.New(), sha256.New()} {
v := &V2{hash: algo}
assert.EqualValues(t, 8, v.Width())
}
}
func newV2Index(hash hash.Hash) *Index {
V2IndexFanout[1] = 1
V2IndexFanout[2] = 2
V2IndexFanout[3] = 3
for i := 3; i < len(V2IndexFanout); i++ {
V2IndexFanout[i] = 3
}
fanout := make([]byte, indexFanoutWidth)
for i, n := range V2IndexFanout {
binary.BigEndian.PutUint32(fanout[i*indexFanoutEntryWidth:], n)
}
hashlen := hash.Size()
names := make([]byte, hashlen*3)
for i := range names {
names[i] = byte((i / hashlen) + 1)
}
buf := make([]byte, 0, indexOffsetV2Start+3)
buf = append(buf, V2IndexHeader...)
buf = append(buf, fanout...)
buf = append(buf, names...)
buf = append(buf, V2IndexCRCs...)
buf = append(buf, V2IndexOffsets...)
return &Index{
fanout: V2IndexFanout,
version: &V2{hash: hash},
r: bytes.NewReader(buf),
}
}
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