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decoder.go
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/
decoder.go
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package base64
import "unsafe"
//go:nosplit
func (e *Encoding) decode(dst []byte, src []byte) int {
dstlen := uintptr(len(dst))
srclen := uintptr(len(src))
if srclen == 0 || (e.pad && (srclen&3) != 0) {
return 0
}
ip := (*sliceHeader)(unsafe.Pointer(&src)).data
ipstart := ip
op := (*sliceHeader)(unsafe.Pointer(&dst)).data
opstart := op
var cu uint32
if srclen >= 8+4 {
ux := ctou32(ip)
vx := ctou32(ip + 4)
for ip < (ipstart+srclen)-(128+4) {
{
_u := ux
ux = ctou32(ip + 8 + 0*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+0*6, _u)
_v := vx
vx = ctou32(ip + 8 + 0*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+0*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 1*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+1*6, _u)
_v := vx
vx = ctou32(ip + 8 + 1*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+1*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 2*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+2*6, _u)
_v := vx
vx = ctou32(ip + 8 + 2*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+2*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 3*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+3*6, _u)
_v := vx
vx = ctou32(ip + 8 + 3*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+3*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 4*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+4*6, _u)
_v := vx
vx = ctou32(ip + 8 + 4*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+4*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 5*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+5*6, _u)
_v := vx
vx = ctou32(ip + 8 + 5*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+5*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 6*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+6*6, _u)
_v := vx
vx = ctou32(ip + 8 + 6*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+6*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 7*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+7*6, _u)
_v := vx
vx = ctou32(ip + 8 + 7*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+7*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 8*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+8*6, _u)
_v := vx
vx = ctou32(ip + 8 + 8*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+8*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 9*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+9*6, _u)
_v := vx
vx = ctou32(ip + 8 + 9*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+9*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 10*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+10*6, _u)
_v := vx
vx = ctou32(ip + 8 + 10*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+10*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 11*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+11*6, _u)
_v := vx
vx = ctou32(ip + 8 + 11*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+11*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 12*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+12*6, _u)
_v := vx
vx = ctou32(ip + 8 + 12*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+12*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 13*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+13*6, _u)
_v := vx
vx = ctou32(ip + 8 + 13*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+13*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 14*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+14*6, _u)
_v := vx
vx = ctou32(ip + 8 + 14*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+14*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 15*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+15*6, _u)
_v := vx
vx = ctou32(ip + 8 + 15*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+15*6+3, _v)
}
ip += 128
op += (128 / 4) * 3
}
for ip < (ipstart+srclen)-(16+4) {
{
_u := ux
ux = ctou32(ip + 8 + 0*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+0*6, _u)
_v := vx
vx = ctou32(ip + 8 + 0*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+0*6+3, _v)
}
{
_u := ux
ux = ctou32(ip + 8 + 1*8)
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+1*6, _u)
_v := vx
vx = ctou32(ip + 8 + 1*8 + 4)
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+1*6+3, _v)
}
ip += 16
op += (16 / 4) * 3
}
if ip < (ipstart+srclen)-(8+4) {
_u := ux
_u = (e.lutXd0[byte(_u)] | e.lutXd1[byte(_u>>8)] | e.lutXd2[byte(_u>>16)] | e.lutXd3[_u>>24])
cu |= _u
stou32(op+0*6, _u)
_v := vx
_v = (e.lutXd0[byte(_v)] | e.lutXd1[byte(_v>>8)] | e.lutXd2[byte(_v>>16)] | e.lutXd3[_v>>24])
cu |= _v
stou32(op+0*6+3, _v)
ip += 8
op += (8 / 4) * 3
}
}
for ip < (ipstart+srclen)-4 {
u := ctou32(ip)
u = (e.lutXd0[byte(u)] | e.lutXd1[byte(u>>8)] | e.lutXd2[byte(u>>16)] | e.lutXd3[u>>24])
stou32(op, u)
cu |= u
ip += 4
op += 3
}
var u uint32
l := (ipstart + srclen) - ip
if e.pad && l == 4 {
if *(*byte)(unsafe.Pointer(ip + 3)) == '=' {
l = 3
if *(*byte)(unsafe.Pointer(ip + 2)) == '=' {
l = 2
}
}
}
up := (*[4]byte)(unsafe.Pointer(&u))
switch l {
case 4:
if !e.pad && op-opstart+3 > dstlen {
return 0
}
u = ctou32(ip)
u = (e.lutXd0[byte(u)] | e.lutXd1[byte(u>>8)] | e.lutXd2[byte(u>>16)] | e.lutXd3[u>>24])
putTail(op, up, 3)
op += 3
cu |= u
break
case 3:
if !e.pad && op-opstart+2 > dstlen {
return 0
}
u = e.lutXd0[*(*byte)(unsafe.Pointer(ip + 0))] | e.lutXd1[*(*byte)(unsafe.Pointer(ip + 1))] | e.lutXd2[*(*byte)(unsafe.Pointer(ip + 2))]
putTail(op, up, 2)
op += 2
cu |= u
break
case 2:
if !e.pad && op-opstart >= dstlen {
return 0
}
u = e.lutXd0[*(*byte)(unsafe.Pointer(ip + 0))] | e.lutXd1[*(*byte)(unsafe.Pointer(ip + 1))]
putTail(op, up, 1)
op++
cu |= u
break
case 1:
return 0
}
if cu == 0xffffffff {
return 0
}
return int(op - opstart)
}