fumiama/unibase2n
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add api EncodeTo / DecodeTo

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This commit is contained in:
源文雨
2022-10-20 23:53:53 +08:00
parent e7db987de9
commit 02876e7774
2 changed files with 67 additions and 8 deletions
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52
decode.go
View File

@@ -51,8 +51,42 @@ func (bs Base) Decode(data []byte) (out []byte) {
return
}
func (bs Base) DecodeTo(data, out []byte) {
if len(data) == 0 || len(data)%2 != 0 {
return
}
if bits.OnesCount8(bs.bit) == 1 { // 2的幂永无offset, 无需管til (1/2/4/8)
switch bs.bit {
case 8:
dec16blk8(bs.off, data, out)
case 4:
mask := uint32(bs.off) | uint32(bs.off)<<16
dec32blk4(mask, data, out)
case 2:
mask := uint64(bs.off) | uint64(bs.off)<<16 | uint64(bs.off)<<32 | uint64(bs.off)<<48
dec64blk2(mask, data, out)
case 1:
mask64 := uint64(bs.off) | uint64(bs.off)<<16 | uint64(bs.off)<<32 | uint64(bs.off)<<48
mask := uint128be{a: mask64, b: mask64}
dec128blk1(mask, data, out)
}
return
}
switch bs.bit {
case 3, 5, 7, 9, 11, 13, 15:
mask64 := uint64(bs.off) | uint64(bs.off)<<16 | uint64(bs.off)<<32 | uint64(bs.off)<<48
mask := uint128be{a: mask64, b: mask64}
dec128blk(mask, bs.bit, data, out)
case 6, 10, 12, 14:
mask := uint64(bs.off) | uint64(bs.off)<<16 | uint64(bs.off)<<32 | uint64(bs.off)<<48
dec64blk(mask, bs.bit, data, out)
}
}
// dec64blk2 for bit 2
// len(in)>0, len(in)%8==0, len(out)==len(in)/8
//
// len(in)>0, len(in)%8==0, len(out)==len(in)/8
//
//go:nosplit
func dec64blk2(mask uint64, in, out []byte) {
for i := range out {
@@ -70,7 +104,9 @@ func dec64blk2(mask uint64, in, out []byte) {
}
// dec32blk4 for bit 4
// len(in)>0, len(in)%4==0, len(out)==len(in)/4
//
// len(in)>0, len(in)%4==0, len(out)==len(in)/4
//
//go:nosplit
func dec32blk4(mask uint32, in, out []byte) {
for i := range out {
@@ -84,7 +120,9 @@ func dec32blk4(mask uint32, in, out []byte) {
}
// dec16blk8 for bit 8
// len(in)>0, len(in)%2==0, len(out)==len(in)/2
//
// len(in)>0, len(in)%2==0, len(out)==len(in)/2
//
//go:nosplit
func dec16blk8(mask uint16, in, out []byte) {
for i := range out {
@@ -95,7 +133,9 @@ func dec16blk8(mask uint16, in, out []byte) {
}
// dec128blk for bit 3 5 6 7 9 11 13 15
// len(in)>0, len(in)%2==0, len(out)==len(in)/16*bit+offset
//
// len(in)>0, len(in)%2==0, len(out)==len(in)/16*bit+offset
//
//go:nosplit
func dec128blk(mask uint128be, bit uint8, in, out []byte) {
var tmp [16]byte
@@ -176,7 +216,9 @@ func dec128blk(mask uint128be, bit uint8, in, out []byte) {
}
// dec64blk for bit 6 10 12 14
// len(in)>0, len(in)%2==0, len(out)==len(in)/16*bit+offset
//
// len(in)>0, len(in)%2==0, len(out)==len(in)/16*bit+offset
//
//go:nosplit
func dec64blk(mask uint64, bit uint8, in, out []byte) {
var tmp [8]byte

23
encode.go
View File

@@ -11,6 +11,20 @@ func (bs Base) Encode(data []byte) (out []byte) {
return nil
}
out = make([]byte, outlen)
bs.encode(data, out, outlen, offset)
return
}
// EncodeTo data to base2n
func (bs Base) EncodeTo(data, out []byte) {
outlen, offset := bs.EncodeLen(len(data))
if outlen <= 0 || offset < 0 {
return
}
bs.encode(data, out, outlen, offset)
}
func (bs Base) encode(data, out []byte, outlen, offset int) {
switch bs.bit {
case 3, 5, 7, 9, 11, 13, 15:
mask64 := uint64(bs.off) | uint64(bs.off)<<16 | uint64(bs.off)<<32 | uint64(bs.off)<<48
@@ -33,11 +47,12 @@ func (bs Base) Encode(data []byte) (out []byte) {
if offset > 0 {
binary.BigEndian.PutUint16(out[outlen-2:outlen], bs.til+uint16(offset))
}
return
}
// enc128blk for bit 3 5 6 7 9 11 13 15
// len(in)>0, len(out)==len(in)/bit*16
//
// len(in)>0, len(out)==len(in)/bit*16
//
//go:nosplit
func enc128blk(mask uint128be, bit uint8, in, out []byte) {
// 由于最后一次处理有读取越界, 因此作扩展
@@ -113,7 +128,9 @@ func enc128blk(mask uint128be, bit uint8, in, out []byte) {
}
// enc64blk for bit 6 10 12 14
// len(in)>0, len(out)==len(in)/bit*16
//
// len(in)>0, len(out)==len(in)/bit*16
//
//go:nosplit
func enc64blk(mask uint64, bit uint8, in, out []byte) {
// 由于最后一次处理有读取越界, 因此作扩展