优化性能

base.go

@@ -22,16 +22,29 @@ var (
 )
 
 // NewBase generates a new base2n config
-func NewBase(off, til uint16, bit uint8) (*Base, error) {
+func NewBase(off, til uint16, bit uint8) (bs Base, err error) {
+	bs = Base{
+		off: off,
+		til: til,
+		bit: bit,
+	}
+	err = bs.check()
+	return
+}
+
+func (bs Base) check() error {
+	off := bs.off
+	til := bs.til
+	bit := bs.bit
 	if off == 0 {
-		return nil, ErrZeroOffsetStart
+		return ErrZeroOffsetStart
 	}
 	if bit >= 16 || bit == 0 {
-		return nil, ErrInvalidBitSize
+		return ErrInvalidBitSize
 	}
 	offe := uint32(off) + 1<<bit // [off, offe)
 	if offe > 0x10000 {
-		return nil, ErrOffsetOverflow
+		return ErrOffsetOverflow
 	}
 	tile := uint32(til) // [til, tile)
 	if bit > 8 && bit%2 == 0 {
@@ -40,14 +53,10 @@ func NewBase(off, til uint16, bit uint8) (*Base, error) {
 		tile += uint32(bit)
 	}
 	if tile > 0x10000 {
-		return nil, ErrTailOverflow
+		return ErrTailOverflow
 	}
 	if tile > uint32(off) && tile <= offe {
-		return nil, ErrTailInCodingArea
+		return ErrTailInCodingArea
 	}
-	return &Base{
+	return nil
-		off: off,
-		til: til,
-		bit: bit,
-	}, nil
 }

code.go

@@ -1,9 +1,9 @@
 package unibase2n
 
-func (bs *Base) Encode(data []byte) []byte {
+func (bs Base) Encode(data []byte) []byte {
 	return nil
 }
 
-func (bs *Base) Decode(data []byte) []byte {
+func (bs Base) Decode(data []byte) []byte {
 	return nil
 }

conv.go

@@ -16,7 +16,7 @@ func UTF82UTF16BE(b []byte) ([]byte, error) {
 	return format.NewEncoder().Bytes(b)
 }
 
-func (bs *Base) EncodeToString(b []byte) string {
+func (bs Base) EncodeToString(b []byte) string {
 	out, err := UTF16BE2UTF8(bs.Encode(b))
 	if err != nil {
 		return ""
@@ -24,11 +24,11 @@ func (bs *Base) EncodeToString(b []byte) string {
 	return BytesToString(out)
 }
 
-func (bs *Base) EncodeFromString(s string) []byte {
+func (bs Base) EncodeFromString(s string) []byte {
 	return bs.Encode(StringToBytes(s))
 }
 
-func (bs *Base) EncodeString(s string) string {
+func (bs Base) EncodeString(s string) string {
 	out, err := UTF16BE2UTF8(bs.Encode(StringToBytes(s)))
 	if err != nil {
 		return ""
@@ -36,11 +36,11 @@ func (bs *Base) EncodeString(s string) string {
 	return BytesToString(out)
 }
 
-func (bs *Base) DecodeToString(d []byte) string {
+func (bs Base) DecodeToString(d []byte) string {
 	return BytesToString(bs.Decode(d))
 }
 
-func (bs *Base) DecodeFromString(s string) []byte {
+func (bs Base) DecodeFromString(s string) []byte {
 	d, err := UTF82UTF16BE(StringToBytes(s))
 	if err != nil {
 		return nil
@@ -48,7 +48,7 @@ func (bs *Base) DecodeFromString(s string) []byte {
 	return bs.Decode(d)
 }
 
-func (bs *Base) DecodeString(s string) string {
+func (bs Base) DecodeString(s string) string {
 	d, err := UTF82UTF16BE(StringToBytes(s))
 	if err != nil {
 		return ""

define.go

@@ -0,0 +1,25 @@
+package unibase2n
+
+var (
+	// Base16384 CJK Unified Ideographs
+	//    see https://github.com/fumiama/base16384
+	Base16384, _ = NewBase(0x4e00, 0x3d00, 14)
+	// Base8192 谚文音節 Hangul Syllables
+	Base8192, _ = NewBase(0xac00, 0xcc00, 13)
+	// Base256 谚文字母 Hangul Jamo
+	Base256, _ = NewBase(0x1100, 0, 8)
+	// BaseMath (256) 數學運算符 Mathematical Operators
+	BaseMath, _ = NewBase(0x2200, 0, 8)
+	// Base128 帶圈或括號的字母數字 Enclosed Alphanumerics
+	Base128, _ = NewBase(0x2460, 0x24f4, 7)
+	// Base64 箭頭 Arrows
+	Base64, _ = NewBase(0x2190, 0x21d0, 6)
+	// Base64Gua 六十四卦 YiJing Hexagram Symbols
+	Base64Gua, _ = NewBase(0x3400, 0x262f, 6)
+	// Base32 方塊元素 Block Elements
+	Base32, _ = NewBase(0x2580, 0x259f, 5)
+	// Base16 漢文訓讀點 Kanbun Kundoku Den
+	Base16, _ = NewBase(0x3190, 0, 4)
+	// Base8 八卦 YiJing Hexagram Symbols
+	Base8, _ = NewBase(0x2630, 0x2689, 3)
+)

pack.go

@@ -2,67 +2,44 @@ package unibase2n
 
 import (
 	"encoding/binary"
+	"errors"
 	"unsafe"
 )
 
 type Pack uint64
 
 var (
-	// Base16384 CJK Unified Ideographs
+	ErrInvalidPack = errors.New("invalid pack")
-	//    see https://github.com/fumiama/base16384
-	Base16384 = newbasepack(0x4e00, 0x3d00, 14)
-	// Base8192 谚文音節 Hangul Syllables
-	Base8192 = newbasepack(0xac00, 0xcc00, 13)
-	// Base256 谚文字母 Hangul Jamo
-	Base256 = newbasepack(0x1100, 0, 8)
-	// BaseMath (256) 數學運算符 Mathematical Operators
-	BaseMath = newbasepack(0x2200, 0, 8)
-	// Base128 帶圈或括號的字母數字 Enclosed Alphanumerics
-	Base128 = newbasepack(0x2460, 0x24f4, 7)
-	// Base64 箭頭 Arrows
-	Base64 = newbasepack(0x2190, 0x21d0, 6)
-	// Base64Gua 六十四卦 YiJing Hexagram Symbols
-	Base64Gua = newbasepack(0x3400, 0x262f, 6)
-	// Base32 方塊元素 Block Elements
-	Base32 = newbasepack(0x2580, 0x259f, 5)
-	// Base16 漢文訓讀點 Kanbun Kundoku Den
-	Base16 = newbasepack(0x3190, 0, 4)
-	// Base8 八卦 YiJing Hexagram Symbols
-	Base8 = newbasepack(0x2630, 0x2689, 3)
 )
 
-func newbasepack(off, til uint16, bit uint8) Pack {
-	b, err := NewBase(off, til, bit)
-	if err != nil {
-		panic(err)
-	}
-	return b.Pack()
-}
-
 // New base2n from a packed config
-func New(pack Pack) *Base {
+func New(pack Pack) (bs Base, err error) {
-	b := &Base{}
+	if pack&0xff == 0 && pack&0xff000000_00000000 == 0 {
+		err = ErrInvalidPack
+		return
+	}
 	ismele := isLittleEndian()
 	isitle := pack&0xffffff != 0
 	if ismele == isitle { // same endian
-		*(*Pack)(unsafe.Pointer(b)) = pack
+		*(*Pack)(unsafe.Pointer(&bs)) = pack
-		return b
+	} else {
+		field := (*[8]byte)(unsafe.Pointer(&pack))
+		if isitle { // packed in little endian but I am big
+			bs.off = binary.BigEndian.Uint16(field[6:8])
+			bs.til = binary.BigEndian.Uint16(field[4:6])
+		} else { // packed in big endian but I am little
+			bs.off = binary.LittleEndian.Uint16(field[6:8])
+			bs.til = binary.LittleEndian.Uint16(field[4:6])
+		}
+		bs.bit = field[3]
 	}
-	field := (*[8]byte)(unsafe.Pointer(&pack))
+	err = bs.check()
-	if isitle { // packed in little endian but I am big
+	return
-		b.off = binary.BigEndian.Uint16(field[6:8])
-		b.til = binary.BigEndian.Uint16(field[4:6])
-	} else { // packed in big endian but I am little
-		b.off = binary.LittleEndian.Uint16(field[6:8])
-		b.til = binary.LittleEndian.Uint16(field[4:6])
-	}
-	b.bit = field[3]
-	return b
 }
 
 // Pack this config into an integer
-func (bs *Base) Pack() Pack {
+func (bs Base) Pack() Pack {
-	return *(*Pack)(unsafe.Pointer(bs))
+	return *(*Pack)(unsafe.Pointer(&bs))
 }
 
 func isLittleEndian() bool {

pack_test.go

@@ -12,15 +12,24 @@ func TestPackUnpack(t *testing.T) {
 		t.Fatal(err)
 	}
 	p := bs.Pack()
-	bs1 := New(p)
+	bs1, err := New(p)
+	if err != nil {
+		t.Fatal(err)
+	}
 	assert.Equal(t, bs, bs1)
 	ismele := isLittleEndian()
 	if ismele {
 		// simulate be pack -> le unpack
-		bs2 := New(0x1234567808000000)
+		bs2, err := New(0x1234567808000000)
+		if err != nil {
+			t.Fatal(err)
+		}
 		assert.Equal(t, bs, bs2)
 	} else { // simulate le pack -> be unpack
-		bs2 := New(0x0000000878563412)
+		bs2, err := New(0x0000000878563412)
+		if err != nil {
+			t.Fatal(err)
+		}
 		assert.Equal(t, bs, bs2)
 	}
 }

uint128be.go

@@ -0,0 +1,6 @@
+package unibase2n
+
+type usgnint128 struct {
+	a uint64
+	b uint64
+}