Update goleveldb dependency

vendor/github.com/syndtr/goleveldb/manualtest/dbstress/key.go

@@ -0,0 +1,137 @@
+package main
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+)
+
+type ErrIkeyCorrupted struct {
+	Ikey   []byte
+	Reason string
+}
+
+func (e *ErrIkeyCorrupted) Error() string {
+	return fmt.Sprintf("leveldb: iKey %q corrupted: %s", e.Ikey, e.Reason)
+}
+
+func newErrIkeyCorrupted(ikey []byte, reason string) error {
+	return errors.NewErrCorrupted(storage.FileDesc{}, &ErrIkeyCorrupted{append([]byte{}, ikey...), reason})
+}
+
+type kType int
+
+func (kt kType) String() string {
+	switch kt {
+	case ktDel:
+		return "d"
+	case ktVal:
+		return "v"
+	}
+	return "x"
+}
+
+// Value types encoded as the last component of internal keys.
+// Don't modify; this value are saved to disk.
+const (
+	ktDel kType = iota
+	ktVal
+)
+
+// ktSeek defines the kType that should be passed when constructing an
+// internal key for seeking to a particular sequence number (since we
+// sort sequence numbers in decreasing order and the value type is
+// embedded as the low 8 bits in the sequence number in internal keys,
+// we need to use the highest-numbered ValueType, not the lowest).
+const ktSeek = ktVal
+
+const (
+	// Maximum value possible for sequence number; the 8-bits are
+	// used by value type, so its can packed together in single
+	// 64-bit integer.
+	kMaxSeq uint64 = (uint64(1) << 56) - 1
+	// Maximum value possible for packed sequence number and type.
+	kMaxNum uint64 = (kMaxSeq << 8) | uint64(ktSeek)
+)
+
+// Maximum number encoded in bytes.
+var kMaxNumBytes = make([]byte, 8)
+
+func init() {
+	binary.LittleEndian.PutUint64(kMaxNumBytes, kMaxNum)
+}
+
+type iKey []byte
+
+func newIkey(ukey []byte, seq uint64, kt kType) iKey {
+	if seq > kMaxSeq {
+		panic("leveldb: invalid sequence number")
+	} else if kt > ktVal {
+		panic("leveldb: invalid type")
+	}
+
+	ik := make(iKey, len(ukey)+8)
+	copy(ik, ukey)
+	binary.LittleEndian.PutUint64(ik[len(ukey):], (seq<<8)|uint64(kt))
+	return ik
+}
+
+func parseIkey(ik []byte) (ukey []byte, seq uint64, kt kType, err error) {
+	if len(ik) < 8 {
+		return nil, 0, 0, newErrIkeyCorrupted(ik, "invalid length")
+	}
+	num := binary.LittleEndian.Uint64(ik[len(ik)-8:])
+	seq, kt = uint64(num>>8), kType(num&0xff)
+	if kt > ktVal {
+		return nil, 0, 0, newErrIkeyCorrupted(ik, "invalid type")
+	}
+	ukey = ik[:len(ik)-8]
+	return
+}
+
+func validIkey(ik []byte) bool {
+	_, _, _, err := parseIkey(ik)
+	return err == nil
+}
+
+func (ik iKey) assert() {
+	if ik == nil {
+		panic("leveldb: nil iKey")
+	}
+	if len(ik) < 8 {
+		panic(fmt.Sprintf("leveldb: iKey %q, len=%d: invalid length", ik, len(ik)))
+	}
+}
+
+func (ik iKey) ukey() []byte {
+	ik.assert()
+	return ik[:len(ik)-8]
+}
+
+func (ik iKey) num() uint64 {
+	ik.assert()
+	return binary.LittleEndian.Uint64(ik[len(ik)-8:])
+}
+
+func (ik iKey) parseNum() (seq uint64, kt kType) {
+	num := ik.num()
+	seq, kt = uint64(num>>8), kType(num&0xff)
+	if kt > ktVal {
+		panic(fmt.Sprintf("leveldb: iKey %q, len=%d: invalid type %#x", ik, len(ik), kt))
+	}
+	return
+}
+
+func (ik iKey) String() string {
+	if ik == nil {
+		return "<nil>"
+	}
+
+	if ukey, seq, kt, err := parseIkey(ik); err == nil {
+		return fmt.Sprintf("%x,%s%d", ukey, kt, seq)
+	} else {
+		return "<invalid>"
+	}
+}