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package packidx_test
import (
"bytes"
"errors"
"testing"
"lindenii.org/go/furgit/internal/format/packidx"
"lindenii.org/go/furgit/object/id"
)
// syntheticEntries builds n distinct entries sorted by object ID,
// spread over the fanout table.
func syntheticEntries(n int) []packidx.Entry {
entries := make([]packidx.Entry, n)
for i := range entries {
entries[i].OID[0] = byte(i * 7)
entries[i].OID[1] = byte(i + 1)
entries[i].Offset = uint64(i+1) * 100
entries[i].CRC32 = uint32(i+1) * 0x01010101
}
return entries
}
func TestWriteMatchesGit(t *testing.T) {
t.Parallel()
for _, objectFormat := range id.SupportedObjectFormats() {
t.Run(objectFormat.String(), func(t *testing.T) {
t.Parallel()
_, prefix, _ := makeGitPack(t, objectFormat)
gitData, idx := parseGitIdxFile(t, prefix, objectFormat)
entries := make([]packidx.Entry, idx.NumObjects())
for pos := range entries {
copy(entries[pos].OID[:], idx.OIDAt(pos))
entries[pos].CRC32 = idx.CRCAt(pos)
offset, err := idx.OffsetAt(pos)
if err != nil {
t.Fatalf("OffsetAt(%d): %v", pos, err)
}
entries[pos].Offset = offset
}
var buf bytes.Buffer
err := packidx.Write(&buf, objectFormat, entries, idx.PackHash())
if err != nil {
t.Fatalf("Write: %v", err)
}
if !bytes.Equal(buf.Bytes(), gitData) {
t.Fatalf("Write output differs from git's index (%d vs %d bytes)", buf.Len(), len(gitData))
}
})
}
}
func TestWriteInvalidEntries(t *testing.T) {
t.Parallel()
unsorted := syntheticEntries(3)
unsorted[0], unsorted[2] = unsorted[2], unsorted[0]
duplicated := syntheticEntries(3)
duplicated[1] = duplicated[0]
cases := []struct {
name string
entries []packidx.Entry
}{
{name: "unsorted", entries: unsorted},
{name: "duplicated", entries: duplicated},
}
for _, objectFormat := range id.SupportedObjectFormats() {
t.Run(objectFormat.String(), func(t *testing.T) {
t.Parallel()
packHash := bytes.Repeat([]byte{0x5a}, objectFormat.Size())
for _, tc := range cases {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
err := packidx.Write(&bytes.Buffer{}, objectFormat, tc.entries, packHash)
if !errors.Is(err, packidx.ErrInvalidEntries) {
t.Fatalf("Write error = %v, want ErrInvalidEntries", err)
}
})
}
})
}
}
func TestWriteBadPackHashPanics(t *testing.T) {
t.Parallel()
objectFormat := id.ObjectFormatSHA256
defer func() {
if recover() == nil {
t.Fatalf("Write with short pack hash: expected panic")
}
}()
_ = packidx.Write(&bytes.Buffer{}, objectFormat, nil, []byte{0x01})
}
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