fumiama/go-base16384
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优化代码结构

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源文雨
2022-09-17 20:46:22 +08:00
parent b75d6ab6d8
commit d47127dc75
1 changed files with 29 additions and 44 deletions
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73
base14_generic.go
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@@ -6,8 +6,10 @@ import "encoding/binary"
func encodeGeneric(offset, outlen int, b, encd []byte) {
var n int
i := 0
if len(b) == 7 {
if len(b)%7 == 0 {
b = append(b, 0)
}
for ; i <= len(b)-7; i += 7 {
shift := binary.BigEndian.Uint64(b[i:]) >> 2
sum := shift
sum &= 0x3fff000000000000
@@ -19,54 +21,37 @@ func encodeGeneric(offset, outlen int, b, encd []byte) {
sum |= shift & 0x0000000000003fff
sum += 0x4e004e004e004e00
binary.BigEndian.PutUint64(encd[n:], sum)
} else {
if len(b)%7 == 0 {
b = append(b, 0)
}
for ; i <= len(b)-7; i += 7 {
shift := binary.BigEndian.Uint64(b[i:]) >> 2
sum := shift
sum &= 0x3fff000000000000
shift >>= 2
sum |= shift & 0x00003fff00000000
shift >>= 2
sum |= shift & 0x000000003fff0000
shift >>= 2
sum |= shift & 0x0000000000003fff
sum += 0x4e004e004e004e00
binary.BigEndian.PutUint64(encd[n:], sum)
n += 8
}
if offset > 0 {
sum := 0x000000000000003f & ((uint64)(b[i]) >> 2)
sum |= ((uint64)(b[i]) << 14) & 0x000000000000c000
if offset > 1 {
sum |= ((uint64)(b[i+1]) << 6) & 0x0000000000003f00
sum |= ((uint64)(b[i+1]) << 20) & 0x0000000000300000
if offset > 2 {
sum |= ((uint64)(b[i+2]) << 12) & 0x00000000000f0000
sum |= ((uint64)(b[i+2]) << 28) & 0x00000000f0000000
if offset > 3 {
sum |= ((uint64)(b[i+3]) << 20) & 0x000000000f000000
sum |= ((uint64)(b[i+3]) << 34) & 0x0000003c00000000
if offset > 4 {
sum |= ((uint64)(b[i+4]) << 26) & 0x0000000300000000
sum |= ((uint64)(b[i+4]) << 42) & 0x0000fc0000000000
if offset > 5 {
sum |= ((uint64)(b[i+5]) << 34) & 0x0000030000000000
sum |= ((uint64)(b[i+5]) << 48) & 0x003f000000000000
}
n += 8
}
if offset > 0 {
sum := 0x000000000000003f & ((uint64)(b[i]) >> 2)
sum |= ((uint64)(b[i]) << 14) & 0x000000000000c000
if offset > 1 {
sum |= ((uint64)(b[i+1]) << 6) & 0x0000000000003f00
sum |= ((uint64)(b[i+1]) << 20) & 0x0000000000300000
if offset > 2 {
sum |= ((uint64)(b[i+2]) << 12) & 0x00000000000f0000
sum |= ((uint64)(b[i+2]) << 28) & 0x00000000f0000000
if offset > 3 {
sum |= ((uint64)(b[i+3]) << 20) & 0x000000000f000000
sum |= ((uint64)(b[i+3]) << 34) & 0x0000003c00000000
if offset > 4 {
sum |= ((uint64)(b[i+4]) << 26) & 0x0000000300000000
sum |= ((uint64)(b[i+4]) << 42) & 0x0000fc0000000000
if offset > 5 {
sum |= ((uint64)(b[i+5]) << 34) & 0x0000030000000000
sum |= ((uint64)(b[i+5]) << 48) & 0x003f000000000000
}
}
}
}
sum += 0x004e004e004e004e
var tmp [8]byte
binary.LittleEndian.PutUint64(tmp[:], sum)
copy(encd[n:], tmp[:])
encd[outlen-2] = '='
encd[outlen-1] = byte(offset)
}
sum += 0x004e004e004e004e
var tmp [8]byte
binary.LittleEndian.PutUint64(tmp[:], sum)
copy(encd[n:], tmp[:])
encd[outlen-2] = '='
encd[outlen-1] = byte(offset)
}
}