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package furgit
import (
"bytes"
"compress/zlib"
"encoding/binary"
"testing"
"git.sr.ht/~runxiyu/furgit/internal/bufpool"
)
func compressBytes(t *testing.T, payload []byte) []byte {
var buf bytes.Buffer
zw := zlib.NewWriter(&buf)
if _, err := zw.Write(payload); err != nil {
t.Fatalf("compress write: %v", err)
}
if err := zw.Close(); err != nil {
t.Fatalf("compress close: %v", err)
}
return buf.Bytes()
}
func TestPackSectionInflate(t *testing.T) {
payload := []byte("pack payload")
compressed := compressBytes(t, payload)
body, err := packSectionInflate(bytes.NewReader(compressed), len(payload))
if err != nil {
t.Fatalf("packSectionInflate error: %v", err)
}
if got := string(body.Bytes()); got != string(payload) {
t.Fatalf("unexpected inflated data: %q", got)
}
body.Release()
body, err = packSectionInflate(bytes.NewReader(compressed), 0)
if err != nil {
t.Fatalf("packSectionInflate streaming error: %v", err)
}
if got := string(body.Bytes()); got != string(payload) {
t.Fatalf("unexpected streaming data: %q", got)
}
body.Release()
}
func encodePackHeader(ty ObjectType, size int) []byte {
first := byte((ty & 0x7) << 4)
first |= byte(size & 0x0f)
size >>= 4
if size == 0 {
return []byte{first}
}
first |= 0x80
out := []byte{first}
for size > 0 {
b := byte(size & 0x7f)
size >>= 7
if size != 0 {
b |= 0x80
}
out = append(out, b)
}
return out
}
func TestPackHeaderRead(t *testing.T) {
buf := encodePackHeader(ObjectTypeTree, 0x1fff)
ty, size, err := packHeaderRead(bytes.NewReader(buf))
if err != nil {
t.Fatalf("packHeaderRead error: %v", err)
}
if ty != ObjectTypeTree || size != 0x1fff {
t.Fatalf("unexpected header decode ty=%d size=%d", ty, size)
}
if _, _, err := packHeaderRead(bytes.NewReader([]byte{0x80})); err == nil {
t.Fatal("expected error for truncated header")
}
}
func encodeVarint(value int) []byte {
var out []byte
for {
b := byte(value & 0x7f)
value >>= 7
if value != 0 {
b |= 0x80
}
out = append(out, b)
if value == 0 {
break
}
}
return out
}
func TestPackVarintRead(t *testing.T) {
buf := encodeVarint(0x3456)
pos := 0
val, err := packVarintRead(buf, &pos)
if err != nil {
t.Fatalf("packVarintRead error: %v", err)
}
if val != 0x3456 {
t.Fatalf("unexpected varint value: %d", val)
}
if pos != len(buf) {
t.Fatalf("expected pos %d, got %d", len(buf), pos)
}
bad := []byte{0x80}
pos = 0
if _, err := packVarintRead(bad, &pos); err == nil {
t.Fatal("expected error for unterminated varint")
}
}
func TestPackDeltaApply(t *testing.T) {
base := bufpool.FromOwned([]byte("abcdefghij"))
defer base.Release()
deltaBytes := []byte{0x0a, 0x0a, 0x91, 0x00, 0x03, 0x03, 'X', 'Y', 'Z', 0x91, 0x06, 0x04}
delta := bufpool.FromOwned(deltaBytes)
defer delta.Release()
out, err := packDeltaApply(base, delta)
if err != nil {
t.Fatalf("packDeltaApply error: %v", err)
}
if got := string(out.Bytes()); got != "abcXYZghij" {
t.Fatalf("unexpected delta output: %q", got)
}
out.Release()
}
func TestPackDeltaApplyMismatchedBaseSize(t *testing.T) {
base := bufpool.FromOwned([]byte("abc"))
defer base.Release()
delta := bufpool.FromOwned([]byte{0x04, 0x04})
defer delta.Release()
if _, err := packDeltaApply(base, delta); err == nil {
t.Fatal("expected error for mismatched base size")
}
}
func TestPackDeltaReadOfsDistance(t *testing.T) {
dist, err := packDeltaReadOfsDistance(bytes.NewReader([]byte{0x81, 0x01}))
if err != nil {
t.Fatalf("packDeltaReadOfsDistance error: %v", err)
}
if dist != 257 {
t.Fatalf("unexpected distance: %d", dist)
}
if _, err := packDeltaReadOfsDistance(bytes.NewReader([]byte{})); err == nil {
t.Fatal("expected error for empty reader")
}
}
func TestBsearchHash(t *testing.T) {
h1 := hashWithByte(0x01)
h2 := hashWithByte(0x03)
names := append(append([]byte(nil), h1.data[:testHashSize]...), h2.data[:testHashSize]...)
idx, found := bsearchHash(names, testHashSize, 0, 2, h2)
if !found || idx != 1 {
t.Fatalf("expected to find second hash, idx=%d found=%v", idx, found)
}
_, found = bsearchHash(names, testHashSize, 0, 2, hashWithByte(0x05))
if found {
t.Fatalf("did not expect to find unknown hash")
}
}
func buildTestPackIndexBuffer(hash Hash, offset uint32) []byte {
fanout := make([]byte, 256*4)
first := int(hash.data[0])
for i := 0; i < 256; i++ {
var val uint32
if i >= first {
val = 1
}
binary.BigEndian.PutUint32(fanout[i*4:], val)
}
var buf bytes.Buffer
_ = binary.Write(&buf, binary.BigEndian, uint32(idxMagic))
_ = binary.Write(&buf, binary.BigEndian, uint32(idxVersion2))
buf.Write(fanout)
buf.Write(hash.data[:testHashSize])
buf.Write(make([]byte, 4))
off32 := make([]byte, 4)
binary.BigEndian.PutUint32(off32, offset)
buf.Write(off32)
buf.Write(make([]byte, 2*testHashSize))
return buf.Bytes()
}
func TestPackIndexParse(t *testing.T) {
h := hashWithByte(0x11)
data := buildTestPackIndexBuffer(h, 0x12345678)
pi := &packIndex{repo: &Repository{hashSize: testHashSize}}
if err := pi.parse(data); err != nil {
t.Fatalf("parse error: %v", err)
}
if pi.numObjects != 1 {
t.Fatalf("expected 1 object, got %d", pi.numObjects)
}
if got, err := pi.offset(0); err != nil || got != 0x12345678 {
t.Fatalf("unexpected 32-bit offset or error: %d, %v", got, err)
}
}
func TestPackIndexOffset64(t *testing.T) {
pi := &packIndex{}
pi.offset32 = make([]byte, 4)
binary.BigEndian.PutUint32(pi.offset32, 0x80000000)
pi.offset64 = make([]byte, 8)
binary.BigEndian.PutUint64(pi.offset64, 0x1_0000_0000)
if got, err := pi.offset(0); err != nil || got != 0x1_0000_0000 {
t.Fatalf("unexpected 64-bit offset or error: %d, %v", got, err)
}
}
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